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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
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MODULES =romtal-sistem-dondurma
INITRAMFS_D = /usr/share/initramfs-tools
IRD = $(DESTDIR)/$(INITRAMFS_D)
build:
install:
mkdir -p "$(IRD)/hooks" "$(IRD)/scripts" "$(DESTDIR)/etc"
set -e; for d in $(MODULES); do \
[ -d "$$d/hooks" ] || continue ; \
install "$$d/hooks"/* "$(IRD)/hooks" ; \
done
set -e ; for d in $(MODULES); do \
for sd in $$d/scripts/*; do \
[ -d $$sd ] || continue; \
td="$(IRD)/scripts/$${sd##*/}"; \
mkdir -p "$$td" ; \
install "$$sd"/* "$$td"; \
done; done
set -e ; for d in $(MODULES); do \
[ -d $$d/conf-hooks.d/ ] || continue; \
mkdir -p "$(IRD)/conf-hooks.d"; \
install -m 644 "$$d/conf-hooks.d"/* "$(IRD)/conf-hooks.d/" ; \
done
set -e; for d in $(MODULES); do \
[ -d "$$d/etc" ] || continue ; \
for f in $$d/etc/*; do \
if [ -d "$$f" ];then \
install -m 755 -d "$(DESTDIR)/etc/$${f##*/}" ; \
install "$$f"/* "$(DESTDIR)/etc/$${f##*/}" ; \
continue ; \
fi ;\
install -m 644 -t "$(DESTDIR)/etc" "$$f" ;\
done; done
set -e; for d in $(MODULES); do \
[ -d "$$d/tools" ] || continue ; \
mkdir -p "$(ULIB_PRE)$$d/" && \
install "$$d/tools"/* "$(ULIB_PRE)$$d/" ; \
done
mkdir -p "$(DESTDIR)/usr/sbin" "$(DESTDIR)/bin" "$(DESTDIR)/usr/share/man/man8"
install -m 755 "romtal-sistem-dondurma/usr/sbin/overlayroot-chroot" "$(DESTDIR)/usr/sbin"
install -m 755 "romtal-sistem-dondurma/bin/romtalsd" "$(DESTDIR)/bin/"
install -m 644 "romtal-sistem-dondurma/usr/share/man/man8/overlayroot-chroot.8" "$(DESTDIR)/usr/share/man/man8"
#
# Fedora/EPEL
#
# vi: ts=4 noexpandtab syntax=make

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# Romtal Sistem Dondurma
**Romtal Sistem Dondurma**, overlayroot tabanlı sistem dondurma işlemini yönetmek için geliştirilmiş, GTK destekli grafik arayüz sunan bir araçtır. Bu proje, özellikle sistemde istenmeyen kalıcı değişikliklerin önüne geçmek amacıyla tasarlanmıştır. Kurulum, .deb paketi aracılığıyla gerçekleştirilir ve sistem entegrasyonu bu yöntemle sağlanır.
---
## Özellikler
- **GTK Tabanlı GUI:** Modern ve kullanıcı dostu arayüz ile sistem dondurma işlemleri.
- **Overlayroot Entegrasyonu:** Sistemin kök dosya sistemini geçici hale getirerek yapılan değişikliklerin silinmesini sağlar.
- **Kurulum Sihirbazı:** İlk çalıştırmada, güvenlik açısından non‑root (önerilen: "ogrenci") kullanıcı oluşturulması önerilir.
- **Root Yetkilendirme:** pkexec ile gerekli sistem komutlarını güvenli bir şekilde çalıştırır.
---
## Gereksinimler
- Debian tabanlı Linux dağıtımları (Debian, Pardus, Ubuntu vb.)
- Root erişimi (pkexec kullanımı nedeniyle)
- GTK 3 kütüphanesi
---
## Kurulum
### Paket Kurulumu
1. **.deb Dosyasını İndirin:**
[romtal-sistem-dondurma_1.0.0-pardus_all.deb](https://codeberg.org/shaanylmz/romtal-sistem-dondurma/src/branch/main/build/romtal-sistem-dondurma_1.0.0-pardus_all.deb)
2. **Paketi Yükleyin:**
Terminali açın ve aşağıdaki komutu çalıştırın (dosya yolunu sisteminizdeki konuma göre düzenleyin):
```bash
sudo dpkg -i /path/to/romtal-sistem-dondurma_1.0.0-pardus_all.deb
```
3. **Bağımlılık Hatalarını Giderin:**
Eğer paket kurulumu sırasında eksik bağımlılık uyarısı alırsanız:
```bash
sudo apt-get install -f
```
> **Not:** .deb paketi, gerekli konfigürasyon dosyalarını ve sistem entegrasyonunu otomatik olarak yapar. Binary dosya tek başına çalıştırıldığında istenen entegrasyon sağlanamaz, bu yüzden paket kurulumu tercih edilmelidir.
---
## Kullanım
1. **Programı Başlatın:**
Paket kurulumu tamamlandıktan sonra, programı root yetkileriyle çalıştırmak için terminalden:
```bash
sudo romtalsd
```
2. **Kurulum Sihirbazı:**
- İlk çalıştırmada, henüz kurulum bayrağı oluşturulmamışsa (örneğin `~/.setup_tamam`), kurulum sihirbazı açılır.
- Sihirbaz, sistemde güvenliği artırmak amacıyla non‑root kullanıcı (önerilen: "ogrenci") oluşturulmasını içerir.
- İlgili adımları takip ederek veya sihirbazı atlayarak ana arayüze geçiş yapabilirsiniz.
3. **Ana Arayüz İşlevleri:**
Ana GUI penceresinde sunulan seçenekler:
- **Sistem Dondurma Aktif Et:** Overlayroot konfigürasyonunu ayarlayarak sistemi dondurur.
(Değişikliklerin geçerli olabilmesi için yeniden başlatma gerekebilir.)
- **Sistem Dondurma Devre Dışı:** Overlayroot ayarlarını temizleyerek dondurma işlemini sonlandırır.
(Sistem yeniden başlatılmalıdır.)
4. **Geri Bildirim:**
Her işlem, GTK diyalog pencereleri ile kullanıcıya bilgi veya hata mesajları sunar.
---
## Geliştirici ve Destek
**Geliştiriciler:**
- **R.O.M.T.A.L**
[https://rasimoneltml.meb.k12.tr/](https://rasimoneltml.meb.k12.tr/)
- **Şahan Yılmaz**
(sahan@chrona.org.tr)
*Bu bir okul projesidir.*
---
## Katkıda Bulunma
Proje ile ilgili katkı ve geri bildirimler için:
- **Issue Açın:** Proje sayfasındaki issue bölümünü kullanarak hata raporu veya önerilerinizi paylaşın.
- **Pull Request Gönderin:** Geliştirme yapıyorsanız, forkladığınız projede yaptığınız değişiklikleri pull request olarak gönderin.
---
## Lisans
Bu proje, **GNU GENERAL PUBLIC LICENSE Version 3** kapsamında lisanslanmıştır. Detaylı lisans bilgileri için lütfen proje dizinindeki **COPYING** dosyasına bakınız.
---
## İletişim
Her türlü soru, öneri veya katkı için Codeberg üzerindeki proje sayfası üzerinden iletişime geçebilirsiniz.

BIN
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debian/tmp/etc/overlayroot.conf
debian/tmp/etc/update-motd.d
debian/tmp/usr/sbin/overlayroot-chroot
debian/tmp/bin/romtalsd
debian/tmp/usr/share/initramfs-tools/hooks/overlayroot
debian/tmp/usr/share/initramfs-tools/scripts/init-bottom/overlayroot
debian/tmp/usr/share/initramfs-tools/conf-hooks.d/overlayroot
debian/tmp/usr/share/man/man8/overlayroot-chroot.8

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./README

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# Triggers added by dh_installinitramfs/13.6ubuntu1
activate-noawait update-initramfs

5
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romtal-sistem-dondurma (1.0.0-pardus) yirmiuc; urgency=medium
* Initial release for PPA.
-- Şahan Yılmaz <sahan@chrona.org.tr> Sat, 22 Feb 2025 01:05:12 +0300

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13

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Source: romtal-sistem-dondurma
Section: admin
Priority: optional
Maintainer: Şahan Yılmaz <sahan@chrona.org.tr>
Uploaders: Şahan Yılmaz <sahan@chrona.org.tr>
Build-Depends: debhelper (>= 9)
Standards-Version: 1.0.0
Homepage: https://www.launchpad.net/romtal-sistem-dondurma
Package: romtal-sistem-dondurma
Architecture: all
Depends: cryptsetup,
cryptsetup-bin,
initramfs-tools,
python3,
${misc:Depends},
${shlibs:Depends}
Suggests: haveged
Description: use an overlayfs on top of a read-only root filesystem
This package adds functionality to an initramfs built by initramfs-tools.
When installed and configured, the initramfs will mount an overlayfs
filesystem on top of a read-only root volume.
.
The changes can be written to a in-memory temporary filesystem, a
filesystem on an existing block device, or a dmcrypt encrypted block
device.
R.O.M.T.A.L DeepFreeze, Linux sistemlerde sistem yapılandırmasının kalıcı olarak değişmesini önlemek ve geçici çalıştırma ortamları oluşturmak için tasarlanmış bir güvenlik ve kararlılık aracıdır. Bu paket, sistem dosyalarının veya yapılandırmaların yapılan değişikliklerle kalıcı hale gelmesini engellemek amacıyla “overlay” tekniğini kullanır. İşleyiş biçimi, sistemin gerçek dosya sistemi üzerine geçici bir katman (genellikle tmpfs tabanlı) ekleyerek, yapılan değişikliklerin sistem yeniden başlatıldığında otomatik olarak sıfırlanmasını sağlar. https://rasimoneltml.meb.k12.tr/

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Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: cloud-initramfs-tools
Files: *
Copyright: 2011 Scott Moser <scott.moser@canonical.com>
License: GPL-3.0+
Files: debian/*
Copyright:
2011 Scott Moser <smoser@ubuntu.com>
2012 Dustin Kirkland <kirkland@ubuntu.com>
2012 Axel Heider
2024 Canonical Ltd.
License: GPL-3.0+
License: GPL-3.0+
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
.
This package is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
.
On Debian systems, the complete text of the GNU General
Public License version 3 can be found in "/usr/share/common-licenses/GPL-3".

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romtal-sistem-dondurma

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README

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romtal-sistem-dondurma_1.0.0-pardus_all.deb admin optional
romtal-sistem-dondurma_1.0.0-pardus_amd64.buildinfo admin optional

1
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dh_auto_install

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etc/overlayroot.conf
etc/update-motd.d
usr/sbin/overlayroot-chroot
bin/romtalsd
usr/share/initramfs-tools/hooks/overlayroot
usr/share/initramfs-tools/scripts/*/overlayroot
usr/share/initramfs-tools/conf-hooks.d/overlayroot
usr/share/man/man8/overlayroot-chroot.8

13
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@ -0,0 +1,13 @@
#!/bin/sh
set -e
case "$1" in
configure)
dpkg-trigger update-initramfs;;
*) exit 0;;
esac
#DEBHELPER#
exit 0
# vi: ts=4 noexpandtab

14
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@ -0,0 +1,14 @@
#!/bin/sh
set -e
case "$1" in
remove|purge)
dpkg-trigger update-initramfs;;
*) exit 0;;
esac
#DEBHELPER#
exit 0
# vi: ts=4 noexpandtab

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@ -0,0 +1,2 @@
misc:Depends=
misc:Pre-Depends=

2
debian/romtal-sistem-dondurma/DEBIAN/conffiles vendored Normal file
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/etc/overlayroot.conf
/etc/update-motd.d/97-overlayroot

19
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Package: romtal-sistem-dondurma
Version: 1.0.0-pardus
Architecture: all
Maintainer: Şahan Yılmaz <sahan@chrona.org.tr>
Installed-Size: 68
Depends: cryptsetup, cryptsetup-bin, initramfs-tools, python3
Suggests: haveged
Section: admin
Priority: optional
Homepage: https://www.launchpad.net/romtal-sistem-dondurma
Description: use an overlayfs on top of a read-only root filesystem
This package adds functionality to an initramfs built by initramfs-tools.
When installed and configured, the initramfs will mount an overlayfs
filesystem on top of a read-only root volume.
.
The changes can be written to a in-memory temporary filesystem, a
filesystem on an existing block device, or a dmcrypt encrypted block
device.
R.O.M.T.A.L DeepFreeze, Linux sistemlerde sistem yapılandırmasının kalıcı olarak değişmesini önlemek ve geçici çalıştırma ortamları oluşturmak için tasarlanmış bir güvenlik ve kararlılık aracıdır. Bu paket, sistem dosyalarının veya yapılandırmaların yapılan değişikliklerle kalıcı hale gelmesini engellemek amacıyla “overlay” tekniğini kullanır. İşleyiş biçimi, sistemin gerçek dosya sistemi üzerine geçici bir katman (genellikle tmpfs tabanlı) ekleyerek, yapılan değişikliklerin sistem yeniden başlatıldığında otomatik olarak sıfırlanmasını sağlar. https://rasimoneltml.meb.k12.tr/

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@ -0,0 +1,9 @@
0f9f9c2689c58c758bc4b576c91d07a6 bin/romtalsd
78db8ba50efd0e523fe4b06083b67dcd usr/sbin/overlayroot-chroot
213f7cda911239a108c2c9eb87c9cc8d usr/share/doc/romtal-sistem-dondurma/README
829285930029ae87f0be17ff6ad6b765 usr/share/doc/romtal-sistem-dondurma/changelog.Debian.gz
d83c42e522a362610b374c35ca056cf8 usr/share/doc/romtal-sistem-dondurma/copyright
94661160a717bcc5639fef40546a7e14 usr/share/initramfs-tools/conf-hooks.d/overlayroot
349725f825813b1ca87b785ce13c09ee usr/share/initramfs-tools/hooks/overlayroot
1ed8aabdf65f9f565fbb26a193a25826 usr/share/initramfs-tools/scripts/init-bottom/overlayroot
e80e667ae504860007cd71006f05e999 usr/share/man/man8/overlayroot-chroot.8.gz

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#!/bin/sh
set -e
case "$1" in
configure)
dpkg-trigger update-initramfs;;
*) exit 0;;
esac
exit 0
# vi: ts=4 noexpandtab

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@ -0,0 +1,14 @@
#!/bin/sh
set -e
case "$1" in
remove|purge)
dpkg-trigger update-initramfs;;
*) exit 0;;
esac
exit 0
# vi: ts=4 noexpandtab

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# Triggers added by dh_installinitramfs/13.6ubuntu1
activate-noawait update-initramfs

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#!/usr/bin/env python3
import os
import subprocess
import sys
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk
def run_as_root(cmd_list):
"""
Verilen komut listesini pkexec ile root olarak çalıştırır.
"""
try:
subprocess.run(["pkexec"] + cmd_list, check=True)
except subprocess.CalledProcessError as e:
raise RuntimeError(f"Komut hatası: {e.cmd}, Çıkış kodu: {e.returncode}")
def get_mount_device(mount_point):
"""
/proc/mounts dosyasını okuyarak, verilen mount noktasının bağlı olduğu cihazı döner.
Args:
mount_point (str): İncelenecek mount noktası, örneğin "/media/root-ro".
Returns:
str veya None: Mount edilmiş aygıtın adı (örneğin, "/dev/sda1")
veya belirtilen mount noktası bulunamazsa None.
"""
try:
with open("/proc/mounts", "r") as f:
for line in f:
parts = line.split()
if parts[1] == mount_point:
return parts[0]
except Exception:
pass
return None
def overlay_status():
"""
/etc/overlayroot.conf dosyasını ve /media/root-rw mount noktasını kontrol eder:
- Eğer /media/root-rw mount edilmişse, overlay aktif kabul edilir.
- Aksi halde, /etc/overlayroot.conf dosyasını açar; içeriğinde "tmpfs" ifadesi varsa overlay aktif,
yoksa overlay pasif olarak belirlenir.
"""
# İlk olarak /media/root-rw mount edilip edilmediğini kontrol et
if get_mount_device("/media/root-rw"):
return True
# /etc/overlayroot.conf kontrolü
conf_path = "/etc/overlayroot.conf"
if os.path.exists(conf_path):
try:
with open(conf_path, "r") as f:
content = f.read()
return "tmpfs" in content
except Exception:
return False
else:
# Dosya yoksa paket kontrolü yapılabilir
try:
result = subprocess.run(["dpkg", "-l", "romtal-sistem-dondurma"], capture_output=True, text=True)
return "overlayroot" in result.stdout
except Exception:
return False
class OverlayrootGUI(Gtk.Window):
def __init__(self):
super().__init__(title="R.O.M.T.A.L Sistem Dondurma")
self.set_default_size(400, 250)
self.set_border_width(20)
# Stil ayarları
css = b"""
button {
font: 15px Arial;
padding: 10px;
margin: 5px;
}
"""
style_provider = Gtk.CssProvider()
style_provider.load_from_data(css)
Gtk.StyleContext.add_provider_for_screen(
Gdk.Screen.get_default(),
style_provider,
Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
)
self.overlay_enabled = overlay_status()
self.create_ui()
def create_ui(self):
grid = Gtk.Grid(column_spacing=10, row_spacing=10)
self.enable_btn = Gtk.Button(label="Sistem Dondurma Aktif Et")
self.disable_btn = Gtk.Button(label="Sistem Dondurma Devre Dışı Bırak")
self.enable_btn.connect("clicked", self.enable_overlayroot)
self.disable_btn.connect("clicked", self.disable_overlayroot)
self.status_label = Gtk.Label()
self.update_status()
# Footer label ekliyoruz
self.footer_label = Gtk.Label(label="Made By R.O.M.T.A.L | https://rasimoneltml.meb.k12.tr/")
grid.attach(self.status_label, 0, 0, 2, 1)
grid.attach(self.enable_btn, 0, 1, 1, 1)
grid.attach(self.disable_btn, 1, 1, 1, 1)
grid.attach(self.footer_label, 0, 2, 2, 1)
self.add(grid)
def update_status(self):
status_text = "Şuanki Durum: " + ("Aktif" if self.overlay_enabled else "Devre Dışı")
self.status_label.set_markup(f"<b>{status_text}</b>")
self.enable_btn.set_sensitive(not self.overlay_enabled)
self.disable_btn.set_sensitive(self.overlay_enabled)
def show_dialog(self, message, is_error=False):
dialog = Gtk.MessageDialog(
parent=self,
flags=0,
message_type=Gtk.MessageType.ERROR if is_error else Gtk.MessageType.INFO,
buttons=Gtk.ButtonsType.OK,
text=message
)
dialog.run()
dialog.destroy()
def enable_overlayroot(self, widget):
try:
cmd = [
"sh", "-c",
("rm -f /etc/overlayroot.conf && "
"echo 'overlayroot_cfgdisk=\"disable\"' > /etc/overlayroot.conf && "
"echo 'overlayroot=\"tmpfs\"' >> /etc/overlayroot.conf")
]
run_as_root(cmd)
self.overlay_enabled = True
self.update_status()
self.show_dialog("Overlayroot aktif edildi!\nDeğişikliklerin geçerli olması için yeniden başlatın.")
except Exception as e:
self.show_dialog(f"Hata oluştu: {str(e)}", is_error=True)
def disable_overlayroot(self, widget):
try:
device = get_mount_device("/media/root-ro")
if not device:
raise RuntimeError("'/media/root-ro' mount edilen cihaz bulunamadı.")
cmd = [
"sh", "-c",
(f"mount -o remount,rw {device} && "
"rm -f /media/root-ro/etc/overlayroot.conf && "
"echo 'overlayroot_cfgdisk=\"disable\"' > /media/root-ro/etc/overlayroot.conf && "
"echo 'overlayroot=\"\"' >> /media/root-ro/etc/overlayroot.conf")
]
run_as_root(cmd)
self.overlay_enabled = False
self.update_status()
self.show_dialog("Overlayroot devre dışı bırakıldı!\nDeğişikliklerin geçerli olması için yeniden başlatın.")
except Exception as e:
self.show_dialog(f"Hata oluştu: {str(e)}", is_error=True)
if __name__ == "__main__":
win = OverlayrootGUI()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()

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overlayroot_cfgdisk="disabled"
overlayroot=""

4
debian/romtal-sistem-dondurma/etc/update-motd.d/97-overlayroot vendored Executable file
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@ -0,0 +1,4 @@
#!/bin/sh
(egrep "overlayroot|/media/root-ro|/media/root-rw" /proc/mounts 2>/dev/null | sort -r) || true
echo

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#!/bin/sh
#
# overlayroot-chroot - chroot wrapper script for overlayroot
# Copyright (C) 2012 Dustin Kirkland <kirkland@ubuntu.com>
#
# Authors: Dustin Kirkland <kirkland@ubuntu.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -e
set -f # disable path expansion
REMOUNTS=""
error() {
printf "ERROR: $@\n" 1>&2
}
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
info() {
printf "INFO: $@\n" 1>&2
}
get_lowerdir() {
local overlay=""
overlay=$(awk \
'$1 == "overlayroot" && $2 == "/" { print $0 }' /proc/mounts)
if [ -n "${overlay}" ]; then
lowerdir=${overlay##*lowerdir=}
lowerdir=${lowerdir%%,*}
if mountpoint "${lowerdir}" >/dev/null; then
_RET="${lowerdir}"
else
fail "Unable to find the overlayroot lowerdir"
fi
else
fail "Unable to find an overlayroot filesystem"
fi
}
clean_exit() {
local mounts="$1" rc=0 d="" lowerdir="" mp=""
for d in ${mounts}; do
if mountpoint ${d} >/dev/null; then
umount ${d} || rc=1
fi
done
for mp in $REMOUNTS; do
mount -o remount,ro "${mp}" ||
error "Note that [${mp}] is still mounted read/write"
done
[ "$2" = "return" ] && return ${rc} || exit ${rc}
}
# Try to find the overlayroot filesystem
get_lowerdir
lowerdir=${_RET}
recurse_mps=$(awk '$1 ~ /^\/dev\// && $2 ~ starts { print $2 }' \
starts="^$lowerdir/" /proc/mounts)
mounts=
for d in proc run sys; do
if ! mountpoint "${lowerdir}/${d}" >/dev/null; then
mount -o bind "/${d}" "${lowerdir}/${d}" || fail "Unable to bind /${d}"
mounts="$mounts $lowerdir/$d"
trap "clean_exit \"${mounts}\" || true" EXIT HUP INT QUIT TERM
fi
done
# Remount with read/write
for mp in "$lowerdir" $recurse_mps; do
mount -o remount,rw "${mp}" &&
REMOUNTS="$mp $REMOUNTS" ||
fail "Unable to remount [$mp] writable"
done
info "Chrooting into [${lowerdir}]"
chroot ${lowerdir} "$@"
# Clean up mounts on exit
clean_exit "${mounts}" "return"
trap "" EXIT HUP INT QUIT TERM
# vi: ts=4 noexpandtab

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This source repository builds packages that work with initramfs-tools
to add function to an initramfs that is likely cloud specific.
Most likely, you do not want to install these packages unless you know
what you're doing.
== growroot ==
This initramfs module will re-write the partition table of a disk
so that the root partition has as much space as possible, bumping it
up to the edge of the disk, or the edge of the next partition.
This is valueable in an environment where a volume can be grown past
its original size. It addresses the following situation:
* The initial [virtual] disk has a partition table on it
* The provisioning system creates a volume with additional space
at the end of the disk (after the root partition)
* the system boots, but cannot use the additional space without a reboot
because the kernel will not re-read the partition table information
of a disk that is in use.
The way this is addressed is:
* in the initramfs unmount the root filesystem
* rewrite the partition table
* tell the kernel to re-read
* remount the root filesystem
== rescuevol ==
When installed the initramfs will check to see if any partitions
with a label of 'RESCUE_VOL' are attached. If such a volume is attached,
it will boot off that volume rather than the root volume.
This is useful in a cloud environment, when the user is able to attach
and detach volumes to a running system, but has no other mechanism
for interupting of fixing a failed boot. It is analogous to inserting
a rescue CD into a system to recover from failure.
It may be helpful in the case where the kernel and ramdisk can be loaded
from the instance, but the system is unusable. This could occur if
an error left ssh access broken or the system didn't come all the way up.
The user could attach a correctly labeled volume, reboot the instance
and access the system to fix it.
If the volume contains a file '/etc/rescuevol-ignore' it will be ignored.
This allows you to fix your instance, create that volume and *not* boot the
rescue volume on next boot
== overlayroot ==
Configure overlayfs filesystems over the root device based on
configuration provided by kernel command line or in-image config.
see overlayroot/etc/overlayroot.conf for more information.
== dyn-netconf ==
see dyn-netconf/doc/README.txt

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Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: cloud-initramfs-tools
Files: *
Copyright: 2011 Scott Moser <scott.moser@canonical.com>
License: GPL-3.0+
Files: debian/*
Copyright:
2011 Scott Moser <smoser@ubuntu.com>
2012 Dustin Kirkland <kirkland@ubuntu.com>
2012 Axel Heider
2024 Canonical Ltd.
License: GPL-3.0+
License: GPL-3.0+
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
.
This package is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
.
On Debian systems, the complete text of the GNU General
Public License version 3 can be found in "/usr/share/common-licenses/GPL-3".

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export CRYPTSETUP=y

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#!/bin/sh
set -e
PREREQS="cryptsetup"
case $1 in
prereqs) echo "${PREREQS}"; exit 0;;
esac
. /usr/share/initramfs-tools/hook-functions
##
copy_exec /usr/bin/head /bin
copy_exec /usr/bin/sha512sum /bin
copy_exec /sbin/wipefs /sbin
copy_exec /sbin/cryptsetup /sbin
copy_exec /sbin/mke2fs /sbin
# this is '||' only in case aesni_intel module isn't built (or others are built in)
manual_add_modules overlayfs overlay dm_mod dm_crypt aesni_intel || true
# Grab as much true random data as possible, up to 4KB, and stash it into a
# random seed in the initramfs
dd if=/dev/random of="${DESTDIR}/.random-seed" bs=1 count=4096 iflag=nonblock >/dev/null 2>&1 || true
# vi: ts=4 noexpandtab

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#!/bin/sh
# Copyright, 2012 Dustin Kirkland <kirkland@ubuntu.com>
# Copyright, 2012 Scott Moser <smoser@ubuntu.com>
# Copyright, 2012 Axel Heider
#
# Based on scripts from
# Sebastian P.
# Nicholas A. Schembri State College PA USA
# Axel Heider
# Dustin Kirkland
# Scott Moser
#
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see
# <http://www.gnu.org/licenses/>.
case "$1" in
# no pre-reqs
prereqs) echo ""; exit 0;;
esac
. /scripts/functions
PATH=/usr/sbin:/usr/bin:/sbin:/bin
MYTAG="overlayroot"
TEMP_D="${TMPDIR:-/tmp}/${0##*/}.configs"
VARIABLES="overlayroot overlayroot_cfgdisk"
# generic settings
# ${ROOT} and ${rootmnt} are predefined by caller of this script. Note that
# the root fs ${rootmnt} it mounted readonly on the initrams, which fits
# nicely for our purposes.
root_rw=/media/root-rw
root_ro=/media/root-ro
ROOTMNT=${rootmnt} # use global name to indicate created outside this
OVERLAYROOT_DEBUG=0
# PERSIST_DIR will persist after pivot-root. It is used for log file
# and for the mktemp-made password file in crypt.
PERSIST_DIR=/run/initramfs
if [ ! -d "$PERSIST_DIR" -a -d /dev/.initramfs ]; then
PERSIST_DIR="/dev/.initramfs"
fi
if [ ! -d "$PERSIST_DIR" ]; then
mkdir -p "$PERSIST_DIR" ||
echo "WARNING: $MYTAG: failed to create ${PERSIST_DIR}" 1>&2
fi
LOG_FILE="${PERSIST_DIR}/${MYTAG}.log"
log() {
"log_${1}_msg" "$MYTAG: $2";
_debug "[$1]:" "$2"
}
log_fail() { log failure "$*"; }
log_success() { log success "$*"; }
log_warn() { log warning "$*"; }
fail() {
[ $# -eq 0 ] || log_fail "$@";
exit 0; # why do we exit success?
}
cleanup() {
[ -d "${TEMP_D}" ] && rm -Rf "${TEMP_D}"
}
debug() {
_debug "$@"
[ "${OVERLAYROOT_DEBUG:-0}" = "0" ] && return
echo "$MYTAG:" "$@"
}
_debug() {
if [ "${DEBUG_BUSTED:-0}" ]; then
{ echo "$@" >> "$LOG_FILE"; } 2>/dev/null ||
{ DEBUG_BUSTED=1; log_warn "debug is busted"; }
fi
}
safe_string() {
local prev="$1" allowed="$2" cur=""
[ -n "$prev" ] || return 1
while cur="${prev#[${allowed}]}"; do
[ -z "$cur" ] && return 0
[ "$cur" = "$prev" ] && break
prev="$cur"
done
return 1
}
parse_string() {
# parse a key/value string like:
# name=mapper,pass=foo,fstype=ext4,mkfs=1
# set variables under namespace 'ns'.
# _RET_name=mapper
# _RET_pass=foo
# _RET_fstype=ext4
# set _RET to the list of variables found
local input="${1}" delim="${2:-,}" ns="${3:-_RET_}"
local oifs="$IFS" tok="" keys="" key="" val=""
set -f; IFS="$delim"; set -- $input; IFS="$oifs"; set +f;
_RET=""
for tok in "$@"; do
key="${tok%%=*}"
val="${tok#${key}}"
val=${val#=}
safe_string "$key" "0-9a-zA-Z_" ||
{ debug "$key not a safe variable name"; return 1; }
eval "${ns}${key}"='${val}' || return 1
keys="${keys} ${ns}${key}"
done
_RET=${keys# }
return
}
get_varval() { eval _RET='${'$1'}'; }
write_kernel_cmdline_cfg() {
local cfg="$1" desc="${2:-kernel cmdline}"
local cmdline="" var=""
read cmdline < /proc/cmdline || return 1
: > "${cfg}" || return
set -f
{
echo "desc='${desc}'"
for tok in $cmdline; do
for var in $VARIABLES; do
if [ "$tok" = "$var" ]; then
log_warn "kernel param without value '${tok}'";
continue;
elif [ "${tok}" = "${var}=" ]; then
echo "${var}=''";
elif [ "${tok#${var}=}" != "${tok}" ]; then
echo "${var}='${tok#${var}=}'"
fi
done
done
} >> "$cfg"
set +f
}
wait_for_dev() {
local dev="$1" timeout="${2:-0}"
[ -b "$dev" ] && return 0
[ "$timeout" = "0" ] && return 1
# wait-for-root writes fstype to stdout, redirect to null
wait-for-root "$dev" "$timeout" >/dev/null
}
crypto_setup() {
local fstype="ext4" pass="" mapname="secure" mkfs="1" dev=""
local timeout=0
local entropy_sources="/proc/sys/kernel/random/boot_id /proc/sys/kernel/random/uuid /dev/urandom"
local seed="" rootseed="$ROOTMNT/var/lib/urandom/random-seed"
if [ ! -f "$rootseed" -a -f "$ROOTMNT/var/lib/systemd/random-seed" ]; then
rootseed="$ROOTMNT/var/lib/systemd/random-seed"
fi
# Seed the psuedo random number generator with available seeds
for seed in "/.random-seed" "$rootseed"; do
[ -f "${seed}" ] ||
{ debug "missing rng seed [${seed}]"; continue; }
cat "${seed}" > /dev/urandom ||
debug "failed seeding /dev/urandom from $seed"
done
# this does necessary crypto setup and sets _RET
# to the appropriate block device (ie /dev/mapper/secure)
# mkfs (default is 1):
# 0: never create filesystem
# 1: if pass is given and mount fails, create a new one
# if no pass given, create new
# 2: if pass is given and mount fails, fail
# if no pass given, create new
local options="$1"
parse_string "${options}" ||
{ log_fail "failed parsing '${options}'"; return 1; }
fstype=${_RET_fstype:-${fstype}}
pass=${_RET_pass:-${pass}}
mapname=${_RET_mapname:-${mapname}}
mkfs=${_RET_mkfs:-${mkfs}}
dev=${_RET_dev:-${dev}}
timeout=${_RET_timeout:-${timeout}}
[ -n "$dev" ] ||
{ log_fail "dev= argument not provided in '${options}'"; return 1; }
short2dev "$dev" ||
{ log_fail "failed to convert $dev to a device"; return 1; }
dev="${_RET}"
debug "fstype=${fstype} pass=${pass} mapname=${mapname}"
debug "mkfs=${mkfs} dev=${dev} timeout=${timeout}"
wait_for_dev "$dev" "$timeout" || {
log_fail "crypt dev device $dev does not exist after ${timeout}s";
return 1;
}
if [ -n "$pass" ]; then
printf "%s" "$pass" |
cryptsetup luksOpen "$dev" "$mapname" --key-file -
if [ $? -eq 0 ]; then
local tdev="/dev/mapper/$mapname"
log_warn "reusing existing luks device at $dev"
wait_for_dev "$tdev" 20 ||
{ log_fail "$tdev did not appear"; return 1; }
_RET_DEVICE="/dev/mapper/$mapname"
return 0
fi
if [ "$mkfs" != "1" ]; then
log_fail "luksOpen failed on $dev with mkfs=$mkfs";
return 1;
fi
log_warn "re-opening $dev failed with mkfs=$mkfs will create new"
else
[ "$mkfs" = "0" ] &&
{ log_fail "mkfs=0, but no password provided"; return 1; }
entropy_sources="$entropy_sources $dev"
local tmpf="" pass_file="${PERSIST_DIR}/${MYTAG}.passwd"
tmpf=$(mktemp "${PERSIST_DIR}/${MYTAG}.XXXXXX") ||
{ log_fail "failed creation of password file"; return 1; }
stat -L /dev/* /proc/* /sys/* >"$tmpf" 2>&1 ||
{ log_warn "could not seed with stat entropy [$entropy_sources]"; }
head -c 4096 $entropy_sources >> "$tmpf" ||
{ log_fail "failed reading entropy [$entropy_sources]"; return 1; }
pass=$(sha512sum "$tmpf") ||
{ log_fail "failed generation of password"; return 1; }
pass=${pass%% *}
printf "%s" "${pass}" > "$tmpf" ||
{ log_fail "failed to record password to '$tmpf'"; return 1; }
mv "$tmpf" "${pass_file}" ||
{ log_fail "failed rename '$tmpf' to '${pass_file}'"; return 1; }
log_debug "stored password in ${pass_file}"
fi
log_warn "setting up new luks device at $dev"
# clear backing device
wipefs -a "$dev" ||
{ log_fail "failed to wipe $dev"; return 1; }
printf "%s" "$pass" | cryptsetup luksFormat "$dev" --key-file - ||
{ log_fail "luksFormat $dev failed"; return 1; }
printf "%s" "$pass" |
cryptsetup luksOpen "$dev" "$mapname" --key-file - ||
{ log_fail "luksOpen $dev failed"; return 1; }
mke2fs -t "${fstype}" "/dev/mapper/${mapname}" || {
log_fail "failed to mkfs -t $fstype on map $mapname";
return 1;
}
_RET_DEVICE="/dev/mapper/$mapname"
return 0
}
dev_setup() {
local options="$1" dev="" timeout=0 path="/"
# options supported:
# dev=device,timeout=X,path=/
parse_string "${options}" ||
{ log_fail "failed parsing '${options}'"; return 1; }
dev=${_RET_dev:-${dev}}
timeout=${_RET_timeout:-${timeout}}
[ -n "$dev" ] ||
{ log_fail "dev= argument not provided in '${options}'"; return 1; }
short2dev "$dev" ||
{ log_fail "failed to convert $dev to a device"; return 1; }
dev="${_RET}"
debug "dev=${dev} timeout=${timeout}"
wait_for_dev "$dev" "$timeout"
_RET_DEVICE="$dev"
}
clean_path() {
# remove '//' in a path.
local p="$1" tmp=""
while [ "${p#*//}" != "$p" ]; do
tmp=${p#*//}
p="${p%%//*}/${tmp}"
done
_RET="$p"
}
get_workdir() {
local root_rw="$1" dir_prefix="$2" file="$3"
file=${file%/}
if [ "$file" = "/" -o "$file" = "" ]; then
file="_"
fi
clean_path "${root_rw}/${dir_prefix%/}-workdir/${file}"
}
gen_fstab() {
# gen_fstab(mp) - generate a fabricated /etc/fstab for mount point $mp
local mp="$1" m_spec="" m_opts="" m_fstype=""
local spec file vfstype opts pass freq
# just remove any trailing /
[ "$mp" != "/" ] && mp=${mp%/}
while read spec file vfstype opts pass freq; do
[ "$file" = "$mp" ] && {
m_spec="$spec"
m_opts="$opts"
m_fstype="$vfstype"
break
}
done </proc/mounts
[ -z "$m_spec" ] && {
log_warn "did not find root mount point $mp in /proc/mounts"
m_opts="/dev/root"
m_opts="defaults"
m_fstype="auto"
}
echo "# fabricated by overlayroot, rootfs did not contain /etc/fstab"
echo "${m_spec} / ${m_fstype} ${m_opts} 0 0 "
}
overlayrootify_fstab() {
# overlayrootify_fstab(input, root_ro, root_rw, dir_prefix, recurse, swap)
# read input fstab file, write an overlayroot version to stdout
# also returns (_RET) a list of directories that will need to be made
local input="$1" root_ro="${2:-/media/root-ro}"
local root_rw="${3:-/media/root-rw}" dir_prefix="${4:-/}"
local recurse=${5:-1} swap=${6:-0} fstype=${7:-overlayfs}
local hash="#" oline="" ospec="" upper="" dirs="" copy_opts="" copy_opt=""
local spec file vfstype opts pass freq line ro_line
local workdir="" use_orig="" relfile="" needs_workdir=false noauto=""
[ -f "$input" ] || return 1
cat <<EOF
#
# This fstab is for overlayroot. The real one can be found at
# ${root_ro}/etc/fstab
# The original entry for '/' and other mounts have been updated to be placed
# under $root_ro.
# To permanently modify this (or any other file), you should change-root into
# a writable view of the underlying filesystem using:
# sudo overlayroot-chroot
#
EOF
needs_workdir && needs_workdir=true || needs_workdir=false
while read spec file vfstype opts pass freq; do
[ "$file" = "/" ] && noauto="noauto" || noauto=""
line="$spec $file $vfstype $opts $pass $freq"
case ",$opts," in
*,ro,*) ro_opts="$opts";;
*) ro_opts="ro,${opts}";;
esac
ro_line="$spec ${root_ro}$file $vfstype"
ro_line="${ro_line} ${ro_opts}${noauto:+,${noauto}} $pass $freq"
use_orig=""
if [ "${spec#${hash}}" != "$spec" ]; then
use_orig="comment"
elif [ -z "$freq" ]; then
use_orig="malformed-line"
else
case "$vfstype" in
vfat|fat) use_orig="fs-unsupported";;
proc|sys|tmpfs|dev|udev|debugfs) use_orig="fs-virtual";;
esac
fi
if [ -n "$use_orig" ]; then
if [ "$use_orig" != "comment" ]; then
echo "$line # $MYTAG:$use_orig"
else
echo "$line"
fi
elif [ "$vfstype" = "swap" ]; then
if [ "$swap" = "0" ]; then
# comment out swap lines
echo "#$MYTAG:swap=${swap}#${line}"
elif [ "${spec#/}" != "${spec}" ] &&
[ "${spec#/dev/}" = "${spec}" ]; then
# comment out swap files (spec starts with / and not in /dev)
echo "#$MYTAG:swapfile#${line}"
else
echo "${line}"
fi
else
ospec="${root_ro}${file}"
copy_opts=""
for copy_opt in nobootwait noauto nofail; do
case ",$opts," in
*,${copy_opt},*)
copy_opts="${copy_opts},${copy_opt}";;
esac
done
clean_path "${root_rw}/${dir_prefix}${file}"
upper="$_RET"
oline="${ospec} ${file} $fstype "
clean_path "${root_ro}${file}"
oline="${oline}lowerdir=$_RET"
oline="${oline},upperdir=${upper}${copy_opts}"
if [ "$fstype" = "overlayfs" -o "$fstype" = "overlay" ] &&
${needs_workdir}; then
get_workdir "$root_rw" "$dir_prefix" "$file"
workdir="$_RET"
oline="${oline},workdir=$workdir"
dirs="${dirs} $workdir"
fi
oline="${oline} $pass $freq"
if [ "$recurse" != "0" -o "$file" = "/" ]; then
if [ "$file" = "/" ]; then
# this can confuse systemd (LP: #1723183)
echo "#$ro_line"
else
echo "$ro_line"
fi
echo "$oline"
dirs="${dirs} ${upper}"
else
echo "$line"
fi
fi
done < "$input"
_RET=${dirs# }
}
short2dev() {
# turn 'LABEL=' or 'UUID=' into a device path
# also support /dev/* and 'vdb' or 'xvda'
local input="$1" oifs="$IFS" dev newdev s
case "$input" in
LABEL=*)
dev="${input#LABEL=}"
case "${dev}" in
*/*) dev="$(echo "${dev}" | sed 's,/,\\x2f,g')";;
esac
dev="/dev/disk/by-label/${dev}"
;;
UUID=*) dev="/dev/disk/by-uuid/${input#UUID=}" ;;
/dev/*) dev="${input}";;
*) dev="/dev/${input}";;
esac
_RET=$dev
}
get_cfg() {
# get_cfg(device, file, cfg, timeout=0)
# copy the file $cfg off $device to $file, waiting $timeout for
# $device to appear
local dev="$1" file="$2" cfg="${3:-overlayroot.conf}" timeout="${4:-0}"
local cfgdev="" success=0 didmnt=false mp="" pre="get_cfg($dev):"
[ -z "$dev" ] && return 1
if [ "$timeout" != "0" ]; then
wait_for_dev "$dev" "$timeout" ||
{ debug "$pre did not appear in $timeout"; return 1; }
else
udevadm settle
fi
short2dev "$dev" && cfgdev="$_RET" && [ -b "$cfgdev" ] ||
{ debug "$pre not present"; return 1; }
if mp="${TEMP_D}/mp" && mkdir "$mp" &&
mount -o ro "$cfgdev" "$mp"; then
if [ -f "$mp/$cfg" ]; then
cp "$mp/$cfg" "$file" && success=1 ||
debug "$pre copy failed"
else
debug "$pre '$file' file not found"
fi
umount "$mp"
else
debug "$pre mount failed"
fi
[ -d "$mp" ] || rmdir "$mp"
[ $success -eq 1 ] || return 1
_RET="$dev/$cfg"
}
parse_cfg() {
# parse_cfg($file,$desc,$vars)
# this reasonably safely sources the "config" file $file
# and then declares the variables listed to stdout
#
# known issues:
# * sourced file could re-define 'echo'
# * just fails if a value has a ' in it
[ -f "$1" ] || return 0
tick="'" sh -c '
__tick=$tick
__file=$1; __desc=$2;
__unset__="__unset__"
shift 2
__vars="$*"
readonly __tick __file __desc __vars
. "${__file}"
if [ $? -ne 0 ]; then
echo "failed source \"${__file}\" ($__desc)" 1>&2
return 1
fi
set -e
echo "desc=${__tick}${__desc}${__tick}"
for var in ${__vars}; do
eval val=\${${var}-${__unset__}} ||
{ echo "eval of $var failed"; exit 1; }
[ "${val#*${__tick}}" = "${val}" ] || {
echo "variable \"$var\" had single tick in it. fail";
exit 1;
}
[ "${val}" = "${__unset__}" ] ||
echo "$var=${__tick}${val}${__tick}"
done
' -- "$@"
}
readcfgd() {
local cfg_d="$1"
# this kind of stinks, each VARIABLE goes into global scope
local or="" or_cfgdisk=""
_RET_desc_oroot=""
_RET_desc_cfgdisk=""
set +f
for f in "${cfg_d}"/*; do
. "$f" || fail "failed reading $f"
[ "$or" != "${overlayroot}" ] &&
_RET_desc_oroot="$desc"
[ "${or_cfgdisk}" != "${overlayroot_cfgdisk}" ] &&
_RET_desc_cfgdisk="$desc"
or=${overlayroot}
or_cfgdisk=${overlayroot_cfgdisk}
done
set -f
}
fix_upstart_overlayfs() {
# inotify events on an overlayfs underlay do not propogate through
# a newly created overlay. This causes job creation and deletion issues
# for upstart, which uses inotify on /etc/init. So ensure that the overlay
# explicitly has a /etc/init (LP: #1213925)
local root="$1"
local initctl="$root/sbin/initctl"
local eifile="/etc/init/.overlayfs-upstart-helper"
[ -e "$initctl" -o -L "$initctl" ] || return 0
[ -d "$root/etc/init" ] || return 0
echo "#upstart needs help for overlayfs (LP: #1213925)." \
> "$root/$eifile" ||
{ log_fail "failed to write $root/$eifile"; return 1; }
debug "created $eifile under $root (LP: #1213925)"
}
needs_workdir() {
local uname_r="${UNAME_R}"
if [ -z "$uname_r" ]; then
uname_r=$(uname -r) && UNAME_R="$uname_r" ||
{ log_warn "failed to read uname!"; return 2; }
fi
# 3.18+ require 'workdir=' option.
case "${uname_r}" in
2*|3.1[01234567]*|3.[0-9].*) return 1;;
*) return 0;;
esac
}
search_fs_driver() {
# search_fs_driver(driver1, driver2...)
# return the first supported filesystem driver in the list.
# if no drivers are provided, search default list.
# assumes that name in /proc/filesystems and module name are the same.
local m="" driver="" tab=' '
for m in "$@"; do
grep -q "${tab}$m$" /proc/filesystems && driver="$m" &&
{ debug "/proc/filesystems support for '$m'"; break; }
done
if [ -z "$driver" ]; then
for m in "$@"; do
if modprobe -qb "$m"; then
if grep -q "${tab}$m$" /proc/filesystems; then
debug "loaded module '$m'";
driver="$m"
break;
else
log_warn "loaded '$m' module but no '$m' in /proc/filesystems"
fi
fi
done
fi
[ -n "$driver" ] ||
{ debug "Unable to find driver/module. searched: $*"; return 1; }
_RET="$driver"
}
cfgd="${TEMP_D}/configs"
mkdir -p "${cfgd}" || fail "failed to create tempdir"
trap cleanup EXIT
# collect the different config locations into a file
# write individual config files in $cfgd that contain
{
echo "desc='builtin'"
echo "overlayroot=''"
echo "overlayroot_cfgdisk='disabled'"
} > "$cfgd/00-builtin"
write_kernel_cmdline_cfg "${cfgd}/90-kernel" ||
fail "failed to read kernel command line!"
parse_cfg "/conf/conf.d/overlayroot" "initramfs config" \
"$VARIABLES" > "${cfgd}/10-initramfs" ||
fail "failed parsing initramfs config"
parse_cfg "${ROOTMNT}/etc/overlayroot.conf" "$ROOT/etc/overlayroot.conf" \
"$VARIABLES" > "${cfgd}/20-root-config" ||
fail "failed parsing root config"
parse_cfg "${ROOTMNT}/etc/overlayroot.local.conf" \
"$ROOT/etc/overlayroot.local.conf" \
"$VARIABLES" > "${cfgd}/30-root-local-config" ||
fail "failed parsing root config"
# now read the trusted configs, to see if overlayroot_cfgdisk is set
readcfgd "$cfgd" ||
fail "reading configs failed"
used_desc="${_RET_desc_oroot}"
[ -n "${_RET_desc_cfgdisk}" ] &&
debug "${_RET_desc_cfgdisk} set cfgdisk='${overlayroot_cfgdisk}'"
# if one of the trusted configs above gave us set the overlayroot_cfgdisk
# variable, then look for such a device and read a config from it.
cfgdisk=0
if [ "${overlayroot_cfgdisk:-disabled}" != "disabled" ] &&
get_cfg "${overlayroot_cfgdisk}" "${TEMP_D}/cfgdisk"; then
desc=${_RET}
parse_cfg "${TEMP_D}/cfgdisk" "${desc}" "$VARIABLES" \
> "${cfgd}/80-cfgdisk" ||
fail "reading config from ${desc} failed"
used_desc="${_RET_desc_oroot}"
# now read the parsed configs again.
readcfgd "$cfgd" ||
fail "reading configs failed"
[ -n "${_RET_desc_cfgdisk}" ] &&
debug "${_RET_desc_cfgdisk} set cfgdisk=${overlayroot_cfgdisk}"
[ -n "${_RET_desc_oroot}" ] &&
debug "${_RET_desc_oroot} set overlayroot=${overlayroot}"
fi
opts=""
cfgmsg="${used_desc:+ (per ${used_desc})}"
case "${overlayroot:-disabled}" in
tmpfs|tmpfs:*)
mode="tmpfs"
opts="${overlayroot#tmpfs}";
opts=${opts#:}
;;
/dev/*|device:*)
case "$overlayroot" in
/dev/*) opts="dev=${overlayroot}";;
*) opts="${overlayroot#device:}";;
esac
dev_setup "${opts}" ||
fail "failed setup overlay for ${overlayroot} [$opts]${cfgmsg}"
mode="device"
device="$_RET_DEVICE"
;;
crypt:*)
mode="crypt"
opts=${overlayroot#crypt:}
crypto_setup "${opts}" ||
fail "failed setup crypt for ${overlayroot}${cfgmsg}"
device="$_RET_DEVICE"
;;
disabled)
debug "overlayroot disabled${cfgmsg}"
exit 0;;
*)
fail "invalid value for overlayroot: ${overlayroot}${cfgmsg}"
exit 0;;
esac
parse_string "$opts" "," _RET_common_
swap=${_RET_common_swap:-0}
recurse=${_RET_common_recurse:-1}
OVERLAYROOT_DEBUG=${_RET_common_debug:-${OVERLAYROOT_DEBUG}}
dir_prefix=${_RET_common_dir:-"/overlay"}
overlayroot_driver=${_RET_common_driver}
read cmdline </proc/cmdline
cmdline=" $cmdline "
[ "${cmdline#* ro }" != "$cmdline" ] && cmdline_ro=true || cmdline_ro=false
if [ "${overlayroot_driver:-auto}" = "auto" ]; then
search_fs_driver overlay overlayfs ||
fail "Unable to find a driver. searched: overlay overlayfs"
overlayroot_driver="$_RET"
else
search_fs_driver ${overlayroot_driver} ||
fail "Unable to find a driver named '${overlayroot_driver}'"
overlayroot_driver="$_RET"
fi
debug "swap=$swap recurse=$recurse debug=$OVERLAYROOT_DEBUG dir=$dir_prefix"
debug "device=$device mode=$mode driver=${overlayroot_driver}"
[ "$swap" = "0" -o "$swap" = "1" ] ||
fail "invalid setting for swap: $swap. must be '0' or '1'"
[ "$recurse" = "0" -o "$recurse" = "1" ] ||
fail "invalid setting for recurse: $recurse. must be '0' or '1'"
log_warn "configuring overlayroot with driver=${overlayroot_driver} mode=$mode opts='$opts' per $used_desc"
# settings based on overlayroot_driver
workdir=""
case "${overlayroot_driver}" in
overlayfs|overlay)
mount_type="${overlayroot_driver}"
mount_opts="-o lowerdir=${root_ro},upperdir=${root_rw}/${dir_prefix}"
if needs_workdir; then
get_workdir "$root_rw" "$dir_prefix" "/"
workdir="$_RET"
mount_opts="${mount_opts},workdir=$workdir"
fi
clean_path "${mount_opts} overlayroot ${ROOTMNT}"
mount_opts="$_RET"
;;
aufs)
mount_type="aufs"
mount_opts="-o dirs=${root_rw}/${dir_prefix}:${root_ro}=ro aufs-root ${ROOTMNT}"
;;
*)
log_fail "invalid overlayroot driver: ${overlayroot_driver}"
panic "$MYTAG"
;;
esac
# make the mount point on the init root fs ${root_rw}
mkdir -p "${root_rw}" ||
fail "failed to create ${root_rw}"
# make the mount point on the init root fs ${root_ro}
mkdir -p "${root_ro}" ||
fail "failed to create ${root_ro}"
# mount the backing device to $root_rw
if [ "$mode" = "tmpfs" ]; then
# mount a tmpfs using the device name tmpfs-root
mount -t tmpfs tmpfs-root "${root_rw}" ||
fail "failed to create tmpfs"
else
# dev or crypto
mount "$device" "${root_rw}" ||
fail "failed mount backing device $device"
fi
mkdir -p "${root_rw}/${dir_prefix}" ||
fail "failed to create ${dir_prefix} on ${device}"
[ -z "$workdir" ] || mkdir -p "$workdir" ||
fail "failed to create workdir '$workdir' on ${device}"
# root is mounted on ${ROOTMNT}, move it to ${ROOT_RO}.
mount --move "${ROOTMNT}" "${root_ro}" ||
fail "failed to move root away from ${ROOTMNT} to ${root_ro}"
# there is nothing left at ${ROOTMNT} now. So for any error we get we should
# either do recovery to restore ${ROOTMNT} for drop to a initramfs shell using
# "panic". Otherwise the boot process is very likely to fail with even more
# errors and leave the system in a wired state.
# mount virtual fs ${ROOTMNT} with rw-fs ${root_rw} on top or ro-fs ${root_ro}.
debug mount -t "$mount_type" $mount_opts
mount -t "$mount_type" $mount_opts
if [ $? -ne 0 ]; then
log_fail "failed to create new ro/rw layered ${ROOTMNT}"
log_fail "mount command was: mount -t $mount_type $mount_opts"
# do recovery and try restoring the mount for ${ROOTMNT}
mount --move ${root_ro} ${ROOTMNT}
if [ $? -ne 0 ]; then
# thats bad, drop to shell to let the user try fixing this
log_fail "RECOVERY_ERROR: failed to move $root_ro back to ${ROOTMNT}"
panic "$MYTAG"
fi
exit 0
fi
# now the real root fs is on ${root_ro} of the init file system, our
# layered root fs is set up at ${ROOTMNT}. So we can write anywhere in
# {ROOTMNT} and the changes will end up in ${root_rw} while ${root_ro} it
# not touched. However ${root_ro} and ${root_rw} are on the initramfs root
# fs, which will be removed an replaced by ${ROOTMNT}. Thus we must move
# ${root_ro} and ${root_rw} to the rootfs visible later, ie.
# ${ROOTMNT}${root_ro} and ${ROOTMNT}${root_ro}. Since the layered ro/rw
# is already up, these changes also end up on ${root_rw} while ${root_ro}
# is not touched.
# move mount from ${root_ro} to ${ROOTMNT}${root_ro}
mkdir -p "${ROOTMNT}/${root_ro}"
mount --move ${root_ro} "${ROOTMNT}${root_ro}" ||
fail "failed to move ${root_ro} to ${ROOTMNT}${root_ro}"
# move mount from ${root_rw} to ${ROOTMNT}${root_rw}
[ -d ${ROOTMNT}${root_rw} ] || mkdir -p ${ROOTMNT}${root_rw}
mount --move "${root_rw}" "${ROOTMNT}${root_rw}" ||
fail "failed to move ${root_rw} to ${ROOTMNT}${root_rw}"
# technically, everything is set up nicely now. Since ${ROOTMNT} had beend
# mounted read-only on the initfamfs already, ${ROOTMNT}${root_ro} is it,
# too. Now we init process could run - but unfortunately, we may have to
# prepare some more things here.
# Basically, there are two ways to deal with the read-only root fs. If the
# system is made aware of this, things can be simplified a lot. If it is
# not, things need to be done to our best knowledge.
#
# So we assume here, the system does not really know about our read-only
# root fs.
#
# Let's deal with /etc/fstab first. It usually contains an entry for the
# root fs, which is no longer valid now. We have to remove it and add our
# new ${root_ro} entry.
# Remember we are still on the initramfs root fs here, so we have to work
# on ${ROOTMNT}/etc/fstab. The original fstab is
# ${ROOTMNT}${root_ro}/etc/fstab.
source_fstab="$ROOTMNT/${root_ro}/etc/fstab"
if [ ! -f "$source_fstab" ] && [ "$cmdline_ro" = "true" ]; then
debug "rootfs did not contain /etc/fstab, creating" \
"based on kernel cmdline"
source_fstab="${TEMP_D}/fstab"
gen_fstab "${ROOTMNT}${root_ro}" > "$source_fstab" ||
log_fail "gen_fstab failed for $ROOTMNT/$root_ro"
fi
if [ -f "$source_fstab" ]; then
overlayrootify_fstab "$source_fstab" "$root_ro" \
"$root_rw" "$dir_prefix" "$recurse" "$swap" "${overlayroot_driver}" \
> "${ROOTMNT}/etc/fstab" ||
log_fail "failed to modify /etc/fstab"
else
debug "rootfs did not contain /etc/fstab."
fi
# we have to make the directories in ${root_rw} because if they do not
# exist, then the 'upper=' argument to overlayfs will fail.
for d in ${_RET}; do
mkdir -p "${ROOTMNT}/$d"
done
if [ "${overlayroot_driver}" = "overlayfs" ]; then
fix_upstart_overlayfs "$ROOTMNT" ||
log_fail "failed to fix upstart for overlayfs"
fi
# if / is supposed to be mounted read-only (cmdline with 'ro')
# then mount our overlayfs as read-only just to be more normal
if [ "${cmdline_ro}" = "true" ]; then
mount -o remount,ro "$ROOTMNT" ||
log_fail "failed to remount overlayroot read-only"
debug "mounted $ROOTMNT read-only per kernel cmdline"
fi
msg="configured root with '$overlayroot' using ${overlayroot_driver} per"
msg="$msg ${used_desc}"
log_success "$msg"
exit 0
# vi: ts=4 noexpandtab

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#!/usr/bin/make -f
# Uncomment this to turn on verbose mode.
#export DH_VERBOSE=1
# This has to be exported to make some magic below work.
export DH_OPTIONS
%:
dh $@
override_dh_auto_install:
dh_auto_install --destdir=debian/tmp

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3.0 (native)

172
debian/tmp/bin/romtalsd vendored Executable file
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#!/usr/bin/env python3
import os
import subprocess
import sys
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk
def run_as_root(cmd_list):
"""
Verilen komut listesini pkexec ile root olarak çalıştırır.
"""
try:
subprocess.run(["pkexec"] + cmd_list, check=True)
except subprocess.CalledProcessError as e:
raise RuntimeError(f"Komut hatası: {e.cmd}, Çıkış kodu: {e.returncode}")
def get_mount_device(mount_point):
"""
/proc/mounts dosyasını okuyarak, verilen mount noktasının bağlı olduğu cihazı döner.
Args:
mount_point (str): İncelenecek mount noktası, örneğin "/media/root-ro".
Returns:
str veya None: Mount edilmiş aygıtın adı (örneğin, "/dev/sda1")
veya belirtilen mount noktası bulunamazsa None.
"""
try:
with open("/proc/mounts", "r") as f:
for line in f:
parts = line.split()
if parts[1] == mount_point:
return parts[0]
except Exception:
pass
return None
def overlay_status():
"""
/etc/overlayroot.conf dosyasını ve /media/root-rw mount noktasını kontrol eder:
- Eğer /media/root-rw mount edilmişse, overlay aktif kabul edilir.
- Aksi halde, /etc/overlayroot.conf dosyasını açar; içeriğinde "tmpfs" ifadesi varsa overlay aktif,
yoksa overlay pasif olarak belirlenir.
"""
# İlk olarak /media/root-rw mount edilip edilmediğini kontrol et
if get_mount_device("/media/root-rw"):
return True
# /etc/overlayroot.conf kontrolü
conf_path = "/etc/overlayroot.conf"
if os.path.exists(conf_path):
try:
with open(conf_path, "r") as f:
content = f.read()
return "tmpfs" in content
except Exception:
return False
else:
# Dosya yoksa paket kontrolü yapılabilir
try:
result = subprocess.run(["dpkg", "-l", "romtal-sistem-dondurma"], capture_output=True, text=True)
return "overlayroot" in result.stdout
except Exception:
return False
class OverlayrootGUI(Gtk.Window):
def __init__(self):
super().__init__(title="R.O.M.T.A.L Sistem Dondurma")
self.set_default_size(400, 250)
self.set_border_width(20)
# Stil ayarları
css = b"""
button {
font: 15px Arial;
padding: 10px;
margin: 5px;
}
"""
style_provider = Gtk.CssProvider()
style_provider.load_from_data(css)
Gtk.StyleContext.add_provider_for_screen(
Gdk.Screen.get_default(),
style_provider,
Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
)
self.overlay_enabled = overlay_status()
self.create_ui()
def create_ui(self):
grid = Gtk.Grid(column_spacing=10, row_spacing=10)
self.enable_btn = Gtk.Button(label="Sistem Dondurma Aktif Et")
self.disable_btn = Gtk.Button(label="Sistem Dondurma Devre Dışı Bırak")
self.enable_btn.connect("clicked", self.enable_overlayroot)
self.disable_btn.connect("clicked", self.disable_overlayroot)
self.status_label = Gtk.Label()
self.update_status()
# Footer label ekliyoruz
self.footer_label = Gtk.Label(label="Made By R.O.M.T.A.L | https://rasimoneltml.meb.k12.tr/")
grid.attach(self.status_label, 0, 0, 2, 1)
grid.attach(self.enable_btn, 0, 1, 1, 1)
grid.attach(self.disable_btn, 1, 1, 1, 1)
grid.attach(self.footer_label, 0, 2, 2, 1)
self.add(grid)
def update_status(self):
status_text = "Şuanki Durum: " + ("Aktif" if self.overlay_enabled else "Devre Dışı")
self.status_label.set_markup(f"<b>{status_text}</b>")
self.enable_btn.set_sensitive(not self.overlay_enabled)
self.disable_btn.set_sensitive(self.overlay_enabled)
def show_dialog(self, message, is_error=False):
dialog = Gtk.MessageDialog(
parent=self,
flags=0,
message_type=Gtk.MessageType.ERROR if is_error else Gtk.MessageType.INFO,
buttons=Gtk.ButtonsType.OK,
text=message
)
dialog.run()
dialog.destroy()
def enable_overlayroot(self, widget):
try:
cmd = [
"sh", "-c",
("rm -f /etc/overlayroot.conf && "
"echo 'overlayroot_cfgdisk=\"disable\"' > /etc/overlayroot.conf && "
"echo 'overlayroot=\"tmpfs\"' >> /etc/overlayroot.conf")
]
run_as_root(cmd)
self.overlay_enabled = True
self.update_status()
self.show_dialog("Overlayroot aktif edildi!\nDeğişikliklerin geçerli olması için yeniden başlatın.")
except Exception as e:
self.show_dialog(f"Hata oluştu: {str(e)}", is_error=True)
def disable_overlayroot(self, widget):
try:
device = get_mount_device("/media/root-ro")
if not device:
raise RuntimeError("'/media/root-ro' mount edilen cihaz bulunamadı.")
cmd = [
"sh", "-c",
(f"mount -o remount,rw {device} && "
"rm -f /media/root-ro/etc/overlayroot.conf && "
"echo 'overlayroot_cfgdisk=\"disable\"' > /media/root-ro/etc/overlayroot.conf && "
"echo 'overlayroot=\"\"' >> /media/root-ro/etc/overlayroot.conf")
]
run_as_root(cmd)
self.overlay_enabled = False
self.update_status()
self.show_dialog("Overlayroot devre dışı bırakıldı!\nDeğişikliklerin geçerli olması için yeniden başlatın.")
except Exception as e:
self.show_dialog(f"Hata oluştu: {str(e)}", is_error=True)
if __name__ == "__main__":
win = OverlayrootGUI()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()

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overlayroot_cfgdisk="disabled"
overlayroot=""

4
debian/tmp/etc/update-motd.d/97-overlayroot vendored Executable file
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#!/bin/sh
(egrep "overlayroot|/media/root-ro|/media/root-rw" /proc/mounts 2>/dev/null | sort -r) || true
echo

93
debian/tmp/usr/sbin/overlayroot-chroot vendored Executable file
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#!/bin/sh
#
# overlayroot-chroot - chroot wrapper script for overlayroot
# Copyright (C) 2012 Dustin Kirkland <kirkland@ubuntu.com>
#
# Authors: Dustin Kirkland <kirkland@ubuntu.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -e
set -f # disable path expansion
REMOUNTS=""
error() {
printf "ERROR: $@\n" 1>&2
}
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
info() {
printf "INFO: $@\n" 1>&2
}
get_lowerdir() {
local overlay=""
overlay=$(awk \
'$1 == "overlayroot" && $2 == "/" { print $0 }' /proc/mounts)
if [ -n "${overlay}" ]; then
lowerdir=${overlay##*lowerdir=}
lowerdir=${lowerdir%%,*}
if mountpoint "${lowerdir}" >/dev/null; then
_RET="${lowerdir}"
else
fail "Unable to find the overlayroot lowerdir"
fi
else
fail "Unable to find an overlayroot filesystem"
fi
}
clean_exit() {
local mounts="$1" rc=0 d="" lowerdir="" mp=""
for d in ${mounts}; do
if mountpoint ${d} >/dev/null; then
umount ${d} || rc=1
fi
done
for mp in $REMOUNTS; do
mount -o remount,ro "${mp}" ||
error "Note that [${mp}] is still mounted read/write"
done
[ "$2" = "return" ] && return ${rc} || exit ${rc}
}
# Try to find the overlayroot filesystem
get_lowerdir
lowerdir=${_RET}
recurse_mps=$(awk '$1 ~ /^\/dev\// && $2 ~ starts { print $2 }' \
starts="^$lowerdir/" /proc/mounts)
mounts=
for d in proc run sys; do
if ! mountpoint "${lowerdir}/${d}" >/dev/null; then
mount -o bind "/${d}" "${lowerdir}/${d}" || fail "Unable to bind /${d}"
mounts="$mounts $lowerdir/$d"
trap "clean_exit \"${mounts}\" || true" EXIT HUP INT QUIT TERM
fi
done
# Remount with read/write
for mp in "$lowerdir" $recurse_mps; do
mount -o remount,rw "${mp}" &&
REMOUNTS="$mp $REMOUNTS" ||
fail "Unable to remount [$mp] writable"
done
info "Chrooting into [${lowerdir}]"
chroot ${lowerdir} "$@"
# Clean up mounts on exit
clean_exit "${mounts}" "return"
trap "" EXIT HUP INT QUIT TERM
# vi: ts=4 noexpandtab

1
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export CRYPTSETUP=y

25
debian/tmp/usr/share/initramfs-tools/hooks/overlayroot vendored Executable file
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#!/bin/sh
set -e
PREREQS="cryptsetup"
case $1 in
prereqs) echo "${PREREQS}"; exit 0;;
esac
. /usr/share/initramfs-tools/hook-functions
##
copy_exec /usr/bin/head /bin
copy_exec /usr/bin/sha512sum /bin
copy_exec /sbin/wipefs /sbin
copy_exec /sbin/cryptsetup /sbin
copy_exec /sbin/mke2fs /sbin
# this is '||' only in case aesni_intel module isn't built (or others are built in)
manual_add_modules overlayfs overlay dm_mod dm_crypt aesni_intel || true
# Grab as much true random data as possible, up to 4KB, and stash it into a
# random seed in the initramfs
dd if=/dev/random of="${DESTDIR}/.random-seed" bs=1 count=4096 iflag=nonblock >/dev/null 2>&1 || true
# vi: ts=4 noexpandtab

878
debian/tmp/usr/share/initramfs-tools/scripts/init-bottom/overlayroot vendored Executable file
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#!/bin/sh
# Copyright, 2012 Dustin Kirkland <kirkland@ubuntu.com>
# Copyright, 2012 Scott Moser <smoser@ubuntu.com>
# Copyright, 2012 Axel Heider
#
# Based on scripts from
# Sebastian P.
# Nicholas A. Schembri State College PA USA
# Axel Heider
# Dustin Kirkland
# Scott Moser
#
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see
# <http://www.gnu.org/licenses/>.
case "$1" in
# no pre-reqs
prereqs) echo ""; exit 0;;
esac
. /scripts/functions
PATH=/usr/sbin:/usr/bin:/sbin:/bin
MYTAG="overlayroot"
TEMP_D="${TMPDIR:-/tmp}/${0##*/}.configs"
VARIABLES="overlayroot overlayroot_cfgdisk"
# generic settings
# ${ROOT} and ${rootmnt} are predefined by caller of this script. Note that
# the root fs ${rootmnt} it mounted readonly on the initrams, which fits
# nicely for our purposes.
root_rw=/media/root-rw
root_ro=/media/root-ro
ROOTMNT=${rootmnt} # use global name to indicate created outside this
OVERLAYROOT_DEBUG=0
# PERSIST_DIR will persist after pivot-root. It is used for log file
# and for the mktemp-made password file in crypt.
PERSIST_DIR=/run/initramfs
if [ ! -d "$PERSIST_DIR" -a -d /dev/.initramfs ]; then
PERSIST_DIR="/dev/.initramfs"
fi
if [ ! -d "$PERSIST_DIR" ]; then
mkdir -p "$PERSIST_DIR" ||
echo "WARNING: $MYTAG: failed to create ${PERSIST_DIR}" 1>&2
fi
LOG_FILE="${PERSIST_DIR}/${MYTAG}.log"
log() {
"log_${1}_msg" "$MYTAG: $2";
_debug "[$1]:" "$2"
}
log_fail() { log failure "$*"; }
log_success() { log success "$*"; }
log_warn() { log warning "$*"; }
fail() {
[ $# -eq 0 ] || log_fail "$@";
exit 0; # why do we exit success?
}
cleanup() {
[ -d "${TEMP_D}" ] && rm -Rf "${TEMP_D}"
}
debug() {
_debug "$@"
[ "${OVERLAYROOT_DEBUG:-0}" = "0" ] && return
echo "$MYTAG:" "$@"
}
_debug() {
if [ "${DEBUG_BUSTED:-0}" ]; then
{ echo "$@" >> "$LOG_FILE"; } 2>/dev/null ||
{ DEBUG_BUSTED=1; log_warn "debug is busted"; }
fi
}
safe_string() {
local prev="$1" allowed="$2" cur=""
[ -n "$prev" ] || return 1
while cur="${prev#[${allowed}]}"; do
[ -z "$cur" ] && return 0
[ "$cur" = "$prev" ] && break
prev="$cur"
done
return 1
}
parse_string() {
# parse a key/value string like:
# name=mapper,pass=foo,fstype=ext4,mkfs=1
# set variables under namespace 'ns'.
# _RET_name=mapper
# _RET_pass=foo
# _RET_fstype=ext4
# set _RET to the list of variables found
local input="${1}" delim="${2:-,}" ns="${3:-_RET_}"
local oifs="$IFS" tok="" keys="" key="" val=""
set -f; IFS="$delim"; set -- $input; IFS="$oifs"; set +f;
_RET=""
for tok in "$@"; do
key="${tok%%=*}"
val="${tok#${key}}"
val=${val#=}
safe_string "$key" "0-9a-zA-Z_" ||
{ debug "$key not a safe variable name"; return 1; }
eval "${ns}${key}"='${val}' || return 1
keys="${keys} ${ns}${key}"
done
_RET=${keys# }
return
}
get_varval() { eval _RET='${'$1'}'; }
write_kernel_cmdline_cfg() {
local cfg="$1" desc="${2:-kernel cmdline}"
local cmdline="" var=""
read cmdline < /proc/cmdline || return 1
: > "${cfg}" || return
set -f
{
echo "desc='${desc}'"
for tok in $cmdline; do
for var in $VARIABLES; do
if [ "$tok" = "$var" ]; then
log_warn "kernel param without value '${tok}'";
continue;
elif [ "${tok}" = "${var}=" ]; then
echo "${var}=''";
elif [ "${tok#${var}=}" != "${tok}" ]; then
echo "${var}='${tok#${var}=}'"
fi
done
done
} >> "$cfg"
set +f
}
wait_for_dev() {
local dev="$1" timeout="${2:-0}"
[ -b "$dev" ] && return 0
[ "$timeout" = "0" ] && return 1
# wait-for-root writes fstype to stdout, redirect to null
wait-for-root "$dev" "$timeout" >/dev/null
}
crypto_setup() {
local fstype="ext4" pass="" mapname="secure" mkfs="1" dev=""
local timeout=0
local entropy_sources="/proc/sys/kernel/random/boot_id /proc/sys/kernel/random/uuid /dev/urandom"
local seed="" rootseed="$ROOTMNT/var/lib/urandom/random-seed"
if [ ! -f "$rootseed" -a -f "$ROOTMNT/var/lib/systemd/random-seed" ]; then
rootseed="$ROOTMNT/var/lib/systemd/random-seed"
fi
# Seed the psuedo random number generator with available seeds
for seed in "/.random-seed" "$rootseed"; do
[ -f "${seed}" ] ||
{ debug "missing rng seed [${seed}]"; continue; }
cat "${seed}" > /dev/urandom ||
debug "failed seeding /dev/urandom from $seed"
done
# this does necessary crypto setup and sets _RET
# to the appropriate block device (ie /dev/mapper/secure)
# mkfs (default is 1):
# 0: never create filesystem
# 1: if pass is given and mount fails, create a new one
# if no pass given, create new
# 2: if pass is given and mount fails, fail
# if no pass given, create new
local options="$1"
parse_string "${options}" ||
{ log_fail "failed parsing '${options}'"; return 1; }
fstype=${_RET_fstype:-${fstype}}
pass=${_RET_pass:-${pass}}
mapname=${_RET_mapname:-${mapname}}
mkfs=${_RET_mkfs:-${mkfs}}
dev=${_RET_dev:-${dev}}
timeout=${_RET_timeout:-${timeout}}
[ -n "$dev" ] ||
{ log_fail "dev= argument not provided in '${options}'"; return 1; }
short2dev "$dev" ||
{ log_fail "failed to convert $dev to a device"; return 1; }
dev="${_RET}"
debug "fstype=${fstype} pass=${pass} mapname=${mapname}"
debug "mkfs=${mkfs} dev=${dev} timeout=${timeout}"
wait_for_dev "$dev" "$timeout" || {
log_fail "crypt dev device $dev does not exist after ${timeout}s";
return 1;
}
if [ -n "$pass" ]; then
printf "%s" "$pass" |
cryptsetup luksOpen "$dev" "$mapname" --key-file -
if [ $? -eq 0 ]; then
local tdev="/dev/mapper/$mapname"
log_warn "reusing existing luks device at $dev"
wait_for_dev "$tdev" 20 ||
{ log_fail "$tdev did not appear"; return 1; }
_RET_DEVICE="/dev/mapper/$mapname"
return 0
fi
if [ "$mkfs" != "1" ]; then
log_fail "luksOpen failed on $dev with mkfs=$mkfs";
return 1;
fi
log_warn "re-opening $dev failed with mkfs=$mkfs will create new"
else
[ "$mkfs" = "0" ] &&
{ log_fail "mkfs=0, but no password provided"; return 1; }
entropy_sources="$entropy_sources $dev"
local tmpf="" pass_file="${PERSIST_DIR}/${MYTAG}.passwd"
tmpf=$(mktemp "${PERSIST_DIR}/${MYTAG}.XXXXXX") ||
{ log_fail "failed creation of password file"; return 1; }
stat -L /dev/* /proc/* /sys/* >"$tmpf" 2>&1 ||
{ log_warn "could not seed with stat entropy [$entropy_sources]"; }
head -c 4096 $entropy_sources >> "$tmpf" ||
{ log_fail "failed reading entropy [$entropy_sources]"; return 1; }
pass=$(sha512sum "$tmpf") ||
{ log_fail "failed generation of password"; return 1; }
pass=${pass%% *}
printf "%s" "${pass}" > "$tmpf" ||
{ log_fail "failed to record password to '$tmpf'"; return 1; }
mv "$tmpf" "${pass_file}" ||
{ log_fail "failed rename '$tmpf' to '${pass_file}'"; return 1; }
log_debug "stored password in ${pass_file}"
fi
log_warn "setting up new luks device at $dev"
# clear backing device
wipefs -a "$dev" ||
{ log_fail "failed to wipe $dev"; return 1; }
printf "%s" "$pass" | cryptsetup luksFormat "$dev" --key-file - ||
{ log_fail "luksFormat $dev failed"; return 1; }
printf "%s" "$pass" |
cryptsetup luksOpen "$dev" "$mapname" --key-file - ||
{ log_fail "luksOpen $dev failed"; return 1; }
mke2fs -t "${fstype}" "/dev/mapper/${mapname}" || {
log_fail "failed to mkfs -t $fstype on map $mapname";
return 1;
}
_RET_DEVICE="/dev/mapper/$mapname"
return 0
}
dev_setup() {
local options="$1" dev="" timeout=0 path="/"
# options supported:
# dev=device,timeout=X,path=/
parse_string "${options}" ||
{ log_fail "failed parsing '${options}'"; return 1; }
dev=${_RET_dev:-${dev}}
timeout=${_RET_timeout:-${timeout}}
[ -n "$dev" ] ||
{ log_fail "dev= argument not provided in '${options}'"; return 1; }
short2dev "$dev" ||
{ log_fail "failed to convert $dev to a device"; return 1; }
dev="${_RET}"
debug "dev=${dev} timeout=${timeout}"
wait_for_dev "$dev" "$timeout"
_RET_DEVICE="$dev"
}
clean_path() {
# remove '//' in a path.
local p="$1" tmp=""
while [ "${p#*//}" != "$p" ]; do
tmp=${p#*//}
p="${p%%//*}/${tmp}"
done
_RET="$p"
}
get_workdir() {
local root_rw="$1" dir_prefix="$2" file="$3"
file=${file%/}
if [ "$file" = "/" -o "$file" = "" ]; then
file="_"
fi
clean_path "${root_rw}/${dir_prefix%/}-workdir/${file}"
}
gen_fstab() {
# gen_fstab(mp) - generate a fabricated /etc/fstab for mount point $mp
local mp="$1" m_spec="" m_opts="" m_fstype=""
local spec file vfstype opts pass freq
# just remove any trailing /
[ "$mp" != "/" ] && mp=${mp%/}
while read spec file vfstype opts pass freq; do
[ "$file" = "$mp" ] && {
m_spec="$spec"
m_opts="$opts"
m_fstype="$vfstype"
break
}
done </proc/mounts
[ -z "$m_spec" ] && {
log_warn "did not find root mount point $mp in /proc/mounts"
m_opts="/dev/root"
m_opts="defaults"
m_fstype="auto"
}
echo "# fabricated by overlayroot, rootfs did not contain /etc/fstab"
echo "${m_spec} / ${m_fstype} ${m_opts} 0 0 "
}
overlayrootify_fstab() {
# overlayrootify_fstab(input, root_ro, root_rw, dir_prefix, recurse, swap)
# read input fstab file, write an overlayroot version to stdout
# also returns (_RET) a list of directories that will need to be made
local input="$1" root_ro="${2:-/media/root-ro}"
local root_rw="${3:-/media/root-rw}" dir_prefix="${4:-/}"
local recurse=${5:-1} swap=${6:-0} fstype=${7:-overlayfs}
local hash="#" oline="" ospec="" upper="" dirs="" copy_opts="" copy_opt=""
local spec file vfstype opts pass freq line ro_line
local workdir="" use_orig="" relfile="" needs_workdir=false noauto=""
[ -f "$input" ] || return 1
cat <<EOF
#
# This fstab is for overlayroot. The real one can be found at
# ${root_ro}/etc/fstab
# The original entry for '/' and other mounts have been updated to be placed
# under $root_ro.
# To permanently modify this (or any other file), you should change-root into
# a writable view of the underlying filesystem using:
# sudo overlayroot-chroot
#
EOF
needs_workdir && needs_workdir=true || needs_workdir=false
while read spec file vfstype opts pass freq; do
[ "$file" = "/" ] && noauto="noauto" || noauto=""
line="$spec $file $vfstype $opts $pass $freq"
case ",$opts," in
*,ro,*) ro_opts="$opts";;
*) ro_opts="ro,${opts}";;
esac
ro_line="$spec ${root_ro}$file $vfstype"
ro_line="${ro_line} ${ro_opts}${noauto:+,${noauto}} $pass $freq"
use_orig=""
if [ "${spec#${hash}}" != "$spec" ]; then
use_orig="comment"
elif [ -z "$freq" ]; then
use_orig="malformed-line"
else
case "$vfstype" in
vfat|fat) use_orig="fs-unsupported";;
proc|sys|tmpfs|dev|udev|debugfs) use_orig="fs-virtual";;
esac
fi
if [ -n "$use_orig" ]; then
if [ "$use_orig" != "comment" ]; then
echo "$line # $MYTAG:$use_orig"
else
echo "$line"
fi
elif [ "$vfstype" = "swap" ]; then
if [ "$swap" = "0" ]; then
# comment out swap lines
echo "#$MYTAG:swap=${swap}#${line}"
elif [ "${spec#/}" != "${spec}" ] &&
[ "${spec#/dev/}" = "${spec}" ]; then
# comment out swap files (spec starts with / and not in /dev)
echo "#$MYTAG:swapfile#${line}"
else
echo "${line}"
fi
else
ospec="${root_ro}${file}"
copy_opts=""
for copy_opt in nobootwait noauto nofail; do
case ",$opts," in
*,${copy_opt},*)
copy_opts="${copy_opts},${copy_opt}";;
esac
done
clean_path "${root_rw}/${dir_prefix}${file}"
upper="$_RET"
oline="${ospec} ${file} $fstype "
clean_path "${root_ro}${file}"
oline="${oline}lowerdir=$_RET"
oline="${oline},upperdir=${upper}${copy_opts}"
if [ "$fstype" = "overlayfs" -o "$fstype" = "overlay" ] &&
${needs_workdir}; then
get_workdir "$root_rw" "$dir_prefix" "$file"
workdir="$_RET"
oline="${oline},workdir=$workdir"
dirs="${dirs} $workdir"
fi
oline="${oline} $pass $freq"
if [ "$recurse" != "0" -o "$file" = "/" ]; then
if [ "$file" = "/" ]; then
# this can confuse systemd (LP: #1723183)
echo "#$ro_line"
else
echo "$ro_line"
fi
echo "$oline"
dirs="${dirs} ${upper}"
else
echo "$line"
fi
fi
done < "$input"
_RET=${dirs# }
}
short2dev() {
# turn 'LABEL=' or 'UUID=' into a device path
# also support /dev/* and 'vdb' or 'xvda'
local input="$1" oifs="$IFS" dev newdev s
case "$input" in
LABEL=*)
dev="${input#LABEL=}"
case "${dev}" in
*/*) dev="$(echo "${dev}" | sed 's,/,\\x2f,g')";;
esac
dev="/dev/disk/by-label/${dev}"
;;
UUID=*) dev="/dev/disk/by-uuid/${input#UUID=}" ;;
/dev/*) dev="${input}";;
*) dev="/dev/${input}";;
esac
_RET=$dev
}
get_cfg() {
# get_cfg(device, file, cfg, timeout=0)
# copy the file $cfg off $device to $file, waiting $timeout for
# $device to appear
local dev="$1" file="$2" cfg="${3:-overlayroot.conf}" timeout="${4:-0}"
local cfgdev="" success=0 didmnt=false mp="" pre="get_cfg($dev):"
[ -z "$dev" ] && return 1
if [ "$timeout" != "0" ]; then
wait_for_dev "$dev" "$timeout" ||
{ debug "$pre did not appear in $timeout"; return 1; }
else
udevadm settle
fi
short2dev "$dev" && cfgdev="$_RET" && [ -b "$cfgdev" ] ||
{ debug "$pre not present"; return 1; }
if mp="${TEMP_D}/mp" && mkdir "$mp" &&
mount -o ro "$cfgdev" "$mp"; then
if [ -f "$mp/$cfg" ]; then
cp "$mp/$cfg" "$file" && success=1 ||
debug "$pre copy failed"
else
debug "$pre '$file' file not found"
fi
umount "$mp"
else
debug "$pre mount failed"
fi
[ -d "$mp" ] || rmdir "$mp"
[ $success -eq 1 ] || return 1
_RET="$dev/$cfg"
}
parse_cfg() {
# parse_cfg($file,$desc,$vars)
# this reasonably safely sources the "config" file $file
# and then declares the variables listed to stdout
#
# known issues:
# * sourced file could re-define 'echo'
# * just fails if a value has a ' in it
[ -f "$1" ] || return 0
tick="'" sh -c '
__tick=$tick
__file=$1; __desc=$2;
__unset__="__unset__"
shift 2
__vars="$*"
readonly __tick __file __desc __vars
. "${__file}"
if [ $? -ne 0 ]; then
echo "failed source \"${__file}\" ($__desc)" 1>&2
return 1
fi
set -e
echo "desc=${__tick}${__desc}${__tick}"
for var in ${__vars}; do
eval val=\${${var}-${__unset__}} ||
{ echo "eval of $var failed"; exit 1; }
[ "${val#*${__tick}}" = "${val}" ] || {
echo "variable \"$var\" had single tick in it. fail";
exit 1;
}
[ "${val}" = "${__unset__}" ] ||
echo "$var=${__tick}${val}${__tick}"
done
' -- "$@"
}
readcfgd() {
local cfg_d="$1"
# this kind of stinks, each VARIABLE goes into global scope
local or="" or_cfgdisk=""
_RET_desc_oroot=""
_RET_desc_cfgdisk=""
set +f
for f in "${cfg_d}"/*; do
. "$f" || fail "failed reading $f"
[ "$or" != "${overlayroot}" ] &&
_RET_desc_oroot="$desc"
[ "${or_cfgdisk}" != "${overlayroot_cfgdisk}" ] &&
_RET_desc_cfgdisk="$desc"
or=${overlayroot}
or_cfgdisk=${overlayroot_cfgdisk}
done
set -f
}
fix_upstart_overlayfs() {
# inotify events on an overlayfs underlay do not propogate through
# a newly created overlay. This causes job creation and deletion issues
# for upstart, which uses inotify on /etc/init. So ensure that the overlay
# explicitly has a /etc/init (LP: #1213925)
local root="$1"
local initctl="$root/sbin/initctl"
local eifile="/etc/init/.overlayfs-upstart-helper"
[ -e "$initctl" -o -L "$initctl" ] || return 0
[ -d "$root/etc/init" ] || return 0
echo "#upstart needs help for overlayfs (LP: #1213925)." \
> "$root/$eifile" ||
{ log_fail "failed to write $root/$eifile"; return 1; }
debug "created $eifile under $root (LP: #1213925)"
}
needs_workdir() {
local uname_r="${UNAME_R}"
if [ -z "$uname_r" ]; then
uname_r=$(uname -r) && UNAME_R="$uname_r" ||
{ log_warn "failed to read uname!"; return 2; }
fi
# 3.18+ require 'workdir=' option.
case "${uname_r}" in
2*|3.1[01234567]*|3.[0-9].*) return 1;;
*) return 0;;
esac
}
search_fs_driver() {
# search_fs_driver(driver1, driver2...)
# return the first supported filesystem driver in the list.
# if no drivers are provided, search default list.
# assumes that name in /proc/filesystems and module name are the same.
local m="" driver="" tab=' '
for m in "$@"; do
grep -q "${tab}$m$" /proc/filesystems && driver="$m" &&
{ debug "/proc/filesystems support for '$m'"; break; }
done
if [ -z "$driver" ]; then
for m in "$@"; do
if modprobe -qb "$m"; then
if grep -q "${tab}$m$" /proc/filesystems; then
debug "loaded module '$m'";
driver="$m"
break;
else
log_warn "loaded '$m' module but no '$m' in /proc/filesystems"
fi
fi
done
fi
[ -n "$driver" ] ||
{ debug "Unable to find driver/module. searched: $*"; return 1; }
_RET="$driver"
}
cfgd="${TEMP_D}/configs"
mkdir -p "${cfgd}" || fail "failed to create tempdir"
trap cleanup EXIT
# collect the different config locations into a file
# write individual config files in $cfgd that contain
{
echo "desc='builtin'"
echo "overlayroot=''"
echo "overlayroot_cfgdisk='disabled'"
} > "$cfgd/00-builtin"
write_kernel_cmdline_cfg "${cfgd}/90-kernel" ||
fail "failed to read kernel command line!"
parse_cfg "/conf/conf.d/overlayroot" "initramfs config" \
"$VARIABLES" > "${cfgd}/10-initramfs" ||
fail "failed parsing initramfs config"
parse_cfg "${ROOTMNT}/etc/overlayroot.conf" "$ROOT/etc/overlayroot.conf" \
"$VARIABLES" > "${cfgd}/20-root-config" ||
fail "failed parsing root config"
parse_cfg "${ROOTMNT}/etc/overlayroot.local.conf" \
"$ROOT/etc/overlayroot.local.conf" \
"$VARIABLES" > "${cfgd}/30-root-local-config" ||
fail "failed parsing root config"
# now read the trusted configs, to see if overlayroot_cfgdisk is set
readcfgd "$cfgd" ||
fail "reading configs failed"
used_desc="${_RET_desc_oroot}"
[ -n "${_RET_desc_cfgdisk}" ] &&
debug "${_RET_desc_cfgdisk} set cfgdisk='${overlayroot_cfgdisk}'"
# if one of the trusted configs above gave us set the overlayroot_cfgdisk
# variable, then look for such a device and read a config from it.
cfgdisk=0
if [ "${overlayroot_cfgdisk:-disabled}" != "disabled" ] &&
get_cfg "${overlayroot_cfgdisk}" "${TEMP_D}/cfgdisk"; then
desc=${_RET}
parse_cfg "${TEMP_D}/cfgdisk" "${desc}" "$VARIABLES" \
> "${cfgd}/80-cfgdisk" ||
fail "reading config from ${desc} failed"
used_desc="${_RET_desc_oroot}"
# now read the parsed configs again.
readcfgd "$cfgd" ||
fail "reading configs failed"
[ -n "${_RET_desc_cfgdisk}" ] &&
debug "${_RET_desc_cfgdisk} set cfgdisk=${overlayroot_cfgdisk}"
[ -n "${_RET_desc_oroot}" ] &&
debug "${_RET_desc_oroot} set overlayroot=${overlayroot}"
fi
opts=""
cfgmsg="${used_desc:+ (per ${used_desc})}"
case "${overlayroot:-disabled}" in
tmpfs|tmpfs:*)
mode="tmpfs"
opts="${overlayroot#tmpfs}";
opts=${opts#:}
;;
/dev/*|device:*)
case "$overlayroot" in
/dev/*) opts="dev=${overlayroot}";;
*) opts="${overlayroot#device:}";;
esac
dev_setup "${opts}" ||
fail "failed setup overlay for ${overlayroot} [$opts]${cfgmsg}"
mode="device"
device="$_RET_DEVICE"
;;
crypt:*)
mode="crypt"
opts=${overlayroot#crypt:}
crypto_setup "${opts}" ||
fail "failed setup crypt for ${overlayroot}${cfgmsg}"
device="$_RET_DEVICE"
;;
disabled)
debug "overlayroot disabled${cfgmsg}"
exit 0;;
*)
fail "invalid value for overlayroot: ${overlayroot}${cfgmsg}"
exit 0;;
esac
parse_string "$opts" "," _RET_common_
swap=${_RET_common_swap:-0}
recurse=${_RET_common_recurse:-1}
OVERLAYROOT_DEBUG=${_RET_common_debug:-${OVERLAYROOT_DEBUG}}
dir_prefix=${_RET_common_dir:-"/overlay"}
overlayroot_driver=${_RET_common_driver}
read cmdline </proc/cmdline
cmdline=" $cmdline "
[ "${cmdline#* ro }" != "$cmdline" ] && cmdline_ro=true || cmdline_ro=false
if [ "${overlayroot_driver:-auto}" = "auto" ]; then
search_fs_driver overlay overlayfs ||
fail "Unable to find a driver. searched: overlay overlayfs"
overlayroot_driver="$_RET"
else
search_fs_driver ${overlayroot_driver} ||
fail "Unable to find a driver named '${overlayroot_driver}'"
overlayroot_driver="$_RET"
fi
debug "swap=$swap recurse=$recurse debug=$OVERLAYROOT_DEBUG dir=$dir_prefix"
debug "device=$device mode=$mode driver=${overlayroot_driver}"
[ "$swap" = "0" -o "$swap" = "1" ] ||
fail "invalid setting for swap: $swap. must be '0' or '1'"
[ "$recurse" = "0" -o "$recurse" = "1" ] ||
fail "invalid setting for recurse: $recurse. must be '0' or '1'"
log_warn "configuring overlayroot with driver=${overlayroot_driver} mode=$mode opts='$opts' per $used_desc"
# settings based on overlayroot_driver
workdir=""
case "${overlayroot_driver}" in
overlayfs|overlay)
mount_type="${overlayroot_driver}"
mount_opts="-o lowerdir=${root_ro},upperdir=${root_rw}/${dir_prefix}"
if needs_workdir; then
get_workdir "$root_rw" "$dir_prefix" "/"
workdir="$_RET"
mount_opts="${mount_opts},workdir=$workdir"
fi
clean_path "${mount_opts} overlayroot ${ROOTMNT}"
mount_opts="$_RET"
;;
aufs)
mount_type="aufs"
mount_opts="-o dirs=${root_rw}/${dir_prefix}:${root_ro}=ro aufs-root ${ROOTMNT}"
;;
*)
log_fail "invalid overlayroot driver: ${overlayroot_driver}"
panic "$MYTAG"
;;
esac
# make the mount point on the init root fs ${root_rw}
mkdir -p "${root_rw}" ||
fail "failed to create ${root_rw}"
# make the mount point on the init root fs ${root_ro}
mkdir -p "${root_ro}" ||
fail "failed to create ${root_ro}"
# mount the backing device to $root_rw
if [ "$mode" = "tmpfs" ]; then
# mount a tmpfs using the device name tmpfs-root
mount -t tmpfs tmpfs-root "${root_rw}" ||
fail "failed to create tmpfs"
else
# dev or crypto
mount "$device" "${root_rw}" ||
fail "failed mount backing device $device"
fi
mkdir -p "${root_rw}/${dir_prefix}" ||
fail "failed to create ${dir_prefix} on ${device}"
[ -z "$workdir" ] || mkdir -p "$workdir" ||
fail "failed to create workdir '$workdir' on ${device}"
# root is mounted on ${ROOTMNT}, move it to ${ROOT_RO}.
mount --move "${ROOTMNT}" "${root_ro}" ||
fail "failed to move root away from ${ROOTMNT} to ${root_ro}"
# there is nothing left at ${ROOTMNT} now. So for any error we get we should
# either do recovery to restore ${ROOTMNT} for drop to a initramfs shell using
# "panic". Otherwise the boot process is very likely to fail with even more
# errors and leave the system in a wired state.
# mount virtual fs ${ROOTMNT} with rw-fs ${root_rw} on top or ro-fs ${root_ro}.
debug mount -t "$mount_type" $mount_opts
mount -t "$mount_type" $mount_opts
if [ $? -ne 0 ]; then
log_fail "failed to create new ro/rw layered ${ROOTMNT}"
log_fail "mount command was: mount -t $mount_type $mount_opts"
# do recovery and try restoring the mount for ${ROOTMNT}
mount --move ${root_ro} ${ROOTMNT}
if [ $? -ne 0 ]; then
# thats bad, drop to shell to let the user try fixing this
log_fail "RECOVERY_ERROR: failed to move $root_ro back to ${ROOTMNT}"
panic "$MYTAG"
fi
exit 0
fi
# now the real root fs is on ${root_ro} of the init file system, our
# layered root fs is set up at ${ROOTMNT}. So we can write anywhere in
# {ROOTMNT} and the changes will end up in ${root_rw} while ${root_ro} it
# not touched. However ${root_ro} and ${root_rw} are on the initramfs root
# fs, which will be removed an replaced by ${ROOTMNT}. Thus we must move
# ${root_ro} and ${root_rw} to the rootfs visible later, ie.
# ${ROOTMNT}${root_ro} and ${ROOTMNT}${root_ro}. Since the layered ro/rw
# is already up, these changes also end up on ${root_rw} while ${root_ro}
# is not touched.
# move mount from ${root_ro} to ${ROOTMNT}${root_ro}
mkdir -p "${ROOTMNT}/${root_ro}"
mount --move ${root_ro} "${ROOTMNT}${root_ro}" ||
fail "failed to move ${root_ro} to ${ROOTMNT}${root_ro}"
# move mount from ${root_rw} to ${ROOTMNT}${root_rw}
[ -d ${ROOTMNT}${root_rw} ] || mkdir -p ${ROOTMNT}${root_rw}
mount --move "${root_rw}" "${ROOTMNT}${root_rw}" ||
fail "failed to move ${root_rw} to ${ROOTMNT}${root_rw}"
# technically, everything is set up nicely now. Since ${ROOTMNT} had beend
# mounted read-only on the initfamfs already, ${ROOTMNT}${root_ro} is it,
# too. Now we init process could run - but unfortunately, we may have to
# prepare some more things here.
# Basically, there are two ways to deal with the read-only root fs. If the
# system is made aware of this, things can be simplified a lot. If it is
# not, things need to be done to our best knowledge.
#
# So we assume here, the system does not really know about our read-only
# root fs.
#
# Let's deal with /etc/fstab first. It usually contains an entry for the
# root fs, which is no longer valid now. We have to remove it and add our
# new ${root_ro} entry.
# Remember we are still on the initramfs root fs here, so we have to work
# on ${ROOTMNT}/etc/fstab. The original fstab is
# ${ROOTMNT}${root_ro}/etc/fstab.
source_fstab="$ROOTMNT/${root_ro}/etc/fstab"
if [ ! -f "$source_fstab" ] && [ "$cmdline_ro" = "true" ]; then
debug "rootfs did not contain /etc/fstab, creating" \
"based on kernel cmdline"
source_fstab="${TEMP_D}/fstab"
gen_fstab "${ROOTMNT}${root_ro}" > "$source_fstab" ||
log_fail "gen_fstab failed for $ROOTMNT/$root_ro"
fi
if [ -f "$source_fstab" ]; then
overlayrootify_fstab "$source_fstab" "$root_ro" \
"$root_rw" "$dir_prefix" "$recurse" "$swap" "${overlayroot_driver}" \
> "${ROOTMNT}/etc/fstab" ||
log_fail "failed to modify /etc/fstab"
else
debug "rootfs did not contain /etc/fstab."
fi
# we have to make the directories in ${root_rw} because if they do not
# exist, then the 'upper=' argument to overlayfs will fail.
for d in ${_RET}; do
mkdir -p "${ROOTMNT}/$d"
done
if [ "${overlayroot_driver}" = "overlayfs" ]; then
fix_upstart_overlayfs "$ROOTMNT" ||
log_fail "failed to fix upstart for overlayfs"
fi
# if / is supposed to be mounted read-only (cmdline with 'ro')
# then mount our overlayfs as read-only just to be more normal
if [ "${cmdline_ro}" = "true" ]; then
mount -o remount,ro "$ROOTMNT" ||
log_fail "failed to remount overlayroot read-only"
debug "mounted $ROOTMNT read-only per kernel cmdline"
fi
msg="configured root with '$overlayroot' using ${overlayroot_driver} per"
msg="$msg ${used_desc}"
log_success "$msg"
exit 0
# vi: ts=4 noexpandtab

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.TH overlayroot-chroot 8 "20 July 2012" overlayroot-chroot "initramfs-tools-overlayroot"
.SH NAME
\fBoverlayroot-chroot\fP - chroot into the lower filesystem in a writable mode
.SH SYNOPSIS
\fBoverlayroot-chroot\fP [COMMAND [ARG]...]
.SH DESCRIPTION
\fBoverlayroot-chroot\fP is a program that sets up bind mounts for \fI/proc\fP, \fI/run\fP, and \fI/sys\fP, remounts the lower directory in an overlayfs with write capabilities and will \fBchroot\fP(8) into it. Upon exit, the bind mounts are unmounted.
Any [COMMAND [ARG]...] are passed directly through to \fBchroot\fP(8).
.SH SEE ALSO
.TP
\fBchroot\fP(8)
.PD
.SH AUTHOR
This manpage and the utility were written by Dustin Kirkland <kirkland@ubuntu.com> for Ubuntu systems (but may be used by others). Permission is granted to copy, distribute and/or modify this document and the utility under the terms of the GNU General Public License, Version 3 published by the Free Software Foundation.
The complete text of the GNU General Public License can be found in \fI/usr/share/common-licenses/GPL\fP on Debian/Ubuntu systems, or on the web at \fIhttp://www.gnu.org/licenses/gpl.txt\fP.

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#!/usr/bin/env python3
import os
import subprocess
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk
# Kurulum bayrağının konumu: Kullanıcının ana dizininde, yazma izni sorunu yaşamamak için.
SETUP_FLAG_FILE = os.path.expanduser("~/.setup_tamam")
# -------------------- Yardımcı Fonksiyonlar --------------------
def run_as_root(cmd_list):
"""
Belirtilen komut listesini pkexec kullanarak root ayrıcalıklarıyla çalıştırır.
Eğer kullanıcı root şifresini girmeyi iptal ederse, uygun uyarı mesajı verir.
"""
try:
subprocess.run(["pkexec"] + cmd_list, check=True)
except subprocess.CalledProcessError as e:
if e.returncode == 1:
raise RuntimeError("Root yetkilendirmesi iptal edildi! Lütfen root şifresini giriniz. Sistem, root yetkisi ile çalıştırılmalıdır.")
raise RuntimeError(f"Komut hatası: {e.cmd}, Çıkış kodu: {e.returncode}")
def set_setup_complete_flag():
"""
Kurulumun tamamlandığını belirten bayrak dosyasını oluşturur.
Böylece sonraki çalıştırmalarda kurulum sihirbazı tekrarlanmaz.
"""
try:
with open(SETUP_FLAG_FILE, "w") as file:
file.write("setup_complete")
except Exception as ex:
print(f"Kurulum bayrağı ayarlanırken hata: {ex}")
def read_users():
"""
Sistemdeki mevcut kullanıcıları /etc/passwd dosyasından okur.
"""
users = []
try:
with open("/etc/passwd", "r") as file:
for line in file:
parts = line.split(":")
if parts:
users.append(parts[0])
except Exception as ex:
print(f"Kullanıcılar okunurken hata: {ex}")
return users
def get_mount_device(mount_point):
"""
Belirtilen mount noktasının bağlı olduğu aygıtı /proc/mounts dosyasından bulur.
"""
try:
with open("/proc/mounts", "r") as file:
for line in file:
parts = line.split()
if parts[1] == mount_point:
return parts[0]
except Exception:
pass
return None
def overlayroot_status():
"""
Sistem Dondurma durumunu, /media/root-rw montajı ve /etc/overlayroot.conf dosyasına göre belirler.
"""
if get_mount_device("/media/root-rw"):
return True
conf_path = "/etc/overlayroot.conf"
if os.path.exists(conf_path):
try:
with open(conf_path, "r") as file:
content = file.read()
return "tmpfs" in content
except Exception:
return False
else:
try:
result = subprocess.run(["dpkg", "-l", "romtal-sistem-dondurma"],
capture_output=True, text=True)
return "overlayroot" in result.stdout
except Exception:
return False
# -------------------- Kurulum Sihirbazı (Setup Wizard) --------------------
class SetupWizard(Gtk.Window):
"""
Üç aşamalı kurulum sihirbazı:
1. Açıklama Sayfası: Neden non‑root kullanıcı kullanılmalı? İki seçenek sunar.
2. Kullanıcı Oluşturma Sayfası: Önerilen "ogrenci" adında, sınırlı yetkili kullanıcı oluşturulur.
3. Onay Sayfası: İşlemin tamamlandığı bildirildiği sayfa.
NOT: Notebook sekmeleri gizlenmiştir; kullanıcı yalnızca sayfa içindeki gezinme butonlarıyla ilerler.
"""
def __init__(self):
super().__init__(title="Kurulum Sihirbazı")
self.set_default_size(600, 500)
self.set_border_width(20)
self.notebook = Gtk.Notebook()
self.notebook.set_show_tabs(False)
self.add(self.notebook)
self.create_explanation_page()
self.create_user_creation_page()
self.create_confirmation_page()
def create_explanation_page(self):
page = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=15)
page.set_border_width(15)
explanation_label = Gtk.Label()
explanation_label.set_markup(
"<b>R.O.M.T.A.L | https://rasimoneltml.meb.k12.tr/</b>\n\n"
"<b>Neden Yeni Bir Kullanıcı Oluşturmalısınız?</b>\n\n"
"Bu sistem, güvenlik açısından root yetkisinin kullanılmaması gereken bir yapıya sahiptir. "
"Root yetkisine sahip bir kullanıcı, sistem üzerinde tam kontrol sağlar ve güvenlik risklerini artırır.\n\n"
"Eğer sisteminizde zaten root yetkisine sahip olmayan bir kullanıcı mevcutsa, bu adımı atlayabilirsiniz. "
"Aksi halde, lütfen 'Devam Et' butonuna basarak örneğin 'ogrenci' adlı sınırlı yetkili bir kullanıcı oluşturun."
)
explanation_label.set_line_wrap(True)
page.pack_start(explanation_label, True, True, 0)
nav_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=10)
skip_button = Gtk.Button(label="Atla")
continue_button = Gtk.Button(label="Devam Et")
skip_button.connect("clicked", self.on_skip_clicked)
continue_button.connect("clicked", self.on_continue_to_creation)
nav_box.pack_start(skip_button, True, True, 0)
nav_box.pack_start(continue_button, True, True, 0)
page.pack_start(nav_box, False, False, 0)
self.notebook.append_page(page, Gtk.Label(label="Açıklama"))
def create_user_creation_page(self):
page = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=15)
page.set_border_width(15)
instruction_label = Gtk.Label(
label="Yeni bir kullanıcı oluşturmak için lütfen bilgileri giriniz. "
"Önerilen kullanıcı adı: 'ogrenci'"
)
instruction_label.set_line_wrap(True)
page.pack_start(instruction_label, False, False, 0)
form_grid = Gtk.Grid(column_spacing=10, row_spacing=10)
username_label = Gtk.Label(label="Kullanıcı Adı:")
self.username_entry = Gtk.Entry()
self.username_entry.set_text("ogrenci")
self.username_entry.set_placeholder_text("örn: ogrenci")
password_label = Gtk.Label(label="Şifre:")
self.password_entry = Gtk.Entry()
self.password_entry.set_placeholder_text("Güçlü bir şifre giriniz")
self.password_entry.set_visibility(False)
form_grid.attach(username_label, 0, 0, 1, 1)
form_grid.attach(self.username_entry, 1, 0, 1, 1)
form_grid.attach(password_label, 0, 1, 1, 1)
form_grid.attach(self.password_entry, 1, 1, 1, 1)
page.pack_start(form_grid, False, False, 0)
nav_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=10)
back_button = Gtk.Button(label="Geri")
create_button = Gtk.Button(label="Kullanıcı Oluştur")
back_button.connect("clicked", lambda w: self.notebook.set_current_page(0))
create_button.connect("clicked", self.on_create_user)
nav_box.pack_start(back_button, True, True, 0)
nav_box.pack_start(create_button, True, True, 0)
page.pack_start(nav_box, False, False, 0)
self.notebook.append_page(page, Gtk.Label(label="Kullanıcı Oluşturma"))
def create_confirmation_page(self):
page = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=15)
page.set_border_width(15)
confirmation_label = Gtk.Label(
label="Kullanıcı başarıyla oluşturuldu.\nKurulum tamamlandı.\n"
"Ana arayüze geçmek için 'Devam Et' butonuna basınız."
)
confirmation_label.set_line_wrap(True)
page.pack_start(confirmation_label, True, True, 0)
nav_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=10)
back_button = Gtk.Button(label="Geri")
continue_button = Gtk.Button(label="Devam Et")
back_button.connect("clicked", lambda w: self.notebook.set_current_page(1))
continue_button.connect("clicked", self.on_final_continue)
nav_box.pack_start(back_button, True, True, 0)
nav_box.pack_start(continue_button, True, True, 0)
page.pack_start(nav_box, False, False, 0)
self.notebook.append_page(page, Gtk.Label(label="Onay"))
def on_skip_clicked(self, widget):
"""
Eğer sisteminizde root yetkisine sahip olmayan bir kullanıcı mevcutsa,
bu adımı atlayarak ana arayüze geçin.
"""
set_setup_complete_flag()
self.hide()
main_app = SistemDondurmaGUI()
main_app.connect("destroy", Gtk.main_quit)
main_app.show_all()
def on_continue_to_creation(self, widget):
"""
'Devam Et' butonuna basıldığında, kullanıcı oluşturma sayfasına geçiş yapılır.
"""
self.notebook.set_current_page(1)
def on_create_user(self, widget):
"""
Kullanıcı adı ve şifre bilgilerini alır, ardından önerilen non‑root kullanıcıyı oluşturur.
Eğer girilen kullanıcı adı zaten sistemde mevcutsa hata mesajı gösterip farklı bir isim istenir.
Kullanıcı oluşturma ve şifre ayarlama işlemleri tek bir pkexec çağrısında birleştirilmiştir.
"""
username = self.username_entry.get_text().strip()
password = self.password_entry.get_text().strip()
if not username or not password:
self.show_dialog("Kullanıcı adı ve şifre boş bırakılamaz!", True)
return
if username in read_users():
self.show_dialog(f"{username} adlı kullanıcı zaten mevcut! Lütfen farklı bir kullanıcı adı giriniz.", True)
return
try:
cmd = ["sh", "-c", f"useradd -m --shell /bin/bash {username} && echo '{username}:{password}' | chpasswd"]
run_as_root(cmd)
self.show_dialog(f"{username} adlı kullanıcı başarıyla oluşturuldu.", False)
self.notebook.set_current_page(2)
except Exception as e:
self.show_dialog(f"Kullanıcı oluşturulurken hata: {e}", True)
def on_final_continue(self, widget):
"""
Kurulum tamamlandığında bayrak dosyası oluşturulur ve ana arayüz açılır.
"""
set_setup_complete_flag()
self.hide()
main_app = SistemDondurmaGUI()
main_app.connect("destroy", Gtk.main_quit)
main_app.show_all()
def show_dialog(self, message, is_error=False):
dialog = Gtk.MessageDialog(
transient_for=self,
flags=0,
message_type=Gtk.MessageType.ERROR if is_error else Gtk.MessageType.INFO,
buttons=Gtk.ButtonsType.OK,
text=message
)
dialog.run()
dialog.destroy()
# -------------------- Ana Uygulama Arayüzü (Sistem Dondurma GUI) --------------------
class SistemDondurmaGUI(Gtk.Window):
def __init__(self):
super().__init__(title="R.O.M.T.A.L Sistem Dondurma")
self.set_default_size(500, 300)
self.set_border_width(20)
self.setup_css()
self.overlayroot_aktif = overlayroot_status()
self.create_ui()
def setup_css(self):
css = b"""
label { font-size: 14px; }
"""
style_provider = Gtk.CssProvider()
style_provider.load_from_data(css)
Gtk.StyleContext.add_provider_for_screen(
Gdk.Screen.get_default(),
style_provider,
Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
)
def create_ui(self):
grid = Gtk.Grid(column_spacing=10, row_spacing=10)
grid.set_column_homogeneous(True)
self.status_label = Gtk.Label()
self.enable_btn = Gtk.Button(label="Sistem Dondurma Aktif Et")
self.enable_btn.connect("clicked", self.enable_overlayroot)
self.disable_btn = Gtk.Button(label="Sistem Dondurma Devre Dışı")
self.disable_btn.connect("clicked", self.disable_overlayroot)
footer_label = Gtk.Label(label="R.O.M.T.A.L | https://rasimoneltml.meb.k12.tr/")
grid.attach(self.status_label, 0, 0, 2, 1)
grid.attach(self.enable_btn, 0, 1, 1, 1)
grid.attach(self.disable_btn, 1, 1, 1, 1)
grid.attach(footer_label, 0, 2, 2, 1)
self.add(grid)
self.update_status()
def update_status(self):
status_text = "Aktif" if self.overlayroot_aktif else "Devre Dışı"
self.status_label.set_markup(f"<b>Sistem Dondurma Durumu: {status_text}</b>")
self.enable_btn.set_sensitive(not self.overlayroot_aktif)
self.disable_btn.set_sensitive(self.overlayroot_aktif)
def show_dialog(self, message, is_error=False):
dialog = Gtk.MessageDialog(
transient_for=self,
flags=0,
message_type=Gtk.MessageType.ERROR if is_error else Gtk.MessageType.INFO,
buttons=Gtk.ButtonsType.OK,
text=message
)
dialog.run()
dialog.destroy()
def enable_overlayroot(self, widget):
try:
cmd = [
"sh", "-c",
("rm -f /etc/overlayroot.conf && "
"echo 'overlayroot_cfgdisk=\"disable\"' > /etc/overlayroot.conf && "
"echo 'overlayroot=\"tmpfs\"' >> /etc/overlayroot.conf")
]
run_as_root(cmd)
self.overlayroot_aktif = True
self.update_status()
self.show_dialog("Sistem Dondurma başarıyla aktif edildi.\nDeğişikliklerin geçerli olması için sistemi yeniden başlatın.")
except Exception as e:
self.show_dialog(f"Sistem Dondurma etkinleştirilirken hata: {e}", True)
def disable_overlayroot(self, widget):
"""
Sistem Dondurma işlemini devre dışı bırakır.
Eğer /media/root-ro mount edilmişse ilgili dizin üzerinden işlem yapılır;
aksi halde, /etc/overlayroot.conf dosyası doğrudan güncellenir.
"""
try:
device = get_mount_device("/media/root-ro")
if device:
cmd = [
"sh", "-c",
(f"mount -o remount,rw {device} && "
"rm -f /media/root-ro/etc/overlayroot.conf && "
"echo 'overlayroot_cfgdisk=\"disable\"' > /media/root-ro/etc/overlayroot.conf && "
"echo 'overlayroot=\"\"' >> /media/root-ro/etc/overlayroot.conf")
]
else:
cmd = [
"sh", "-c",
("rm -f /etc/overlayroot.conf && "
"echo 'overlayroot_cfgdisk=\"disable\"' > /etc/overlayroot.conf && "
"echo 'overlayroot=\"\"' >> /etc/overlayroot.conf")
]
run_as_root(cmd)
self.overlayroot_aktif = False
self.update_status()
self.show_dialog("Sistem Dondurma başarıyla devre dışı bırakıldı.\nDeğişikliklerin geçerli olması için sistemi yeniden başlatın.")
except Exception as e:
self.show_dialog(f"Sistem Dondurma devre dışı bırakılırken hata: {e}", True)
# -------------------- Uygulama Giriş Noktası --------------------
if __name__ == "__main__":
if not os.path.exists(SETUP_FLAG_FILE):
wizard = SetupWizard()
wizard.connect("destroy", Gtk.main_quit)
wizard.show_all()
else:
app = SistemDondurmaGUI()
app.connect("destroy", Gtk.main_quit)
app.show_all()
Gtk.main()

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romtal-sistem-dondurma/conf-hooks.d/overlayroot Normal file
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export CRYPTSETUP=y

2
romtal-sistem-dondurma/etc/overlayroot.conf Normal file
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overlayroot_cfgdisk="disabled"
overlayroot=""

4
romtal-sistem-dondurma/etc/update-motd.d/97-overlayroot Normal file
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#!/bin/sh
(egrep "overlayroot|/media/root-ro|/media/root-rw" /proc/mounts 2>/dev/null | sort -r) || true
echo

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romtal-sistem-dondurma/hooks/overlayroot Executable file
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#!/bin/sh
set -e
PREREQS="cryptsetup"
case $1 in
prereqs) echo "${PREREQS}"; exit 0;;
esac
. /usr/share/initramfs-tools/hook-functions
##
copy_exec /usr/bin/head /bin
copy_exec /usr/bin/sha512sum /bin
copy_exec /sbin/wipefs /sbin
copy_exec /sbin/cryptsetup /sbin
copy_exec /sbin/mke2fs /sbin
# this is '||' only in case aesni_intel module isn't built (or others are built in)
manual_add_modules overlayfs overlay dm_mod dm_crypt aesni_intel || true
# Grab as much true random data as possible, up to 4KB, and stash it into a
# random seed in the initramfs
dd if=/dev/random of="${DESTDIR}/.random-seed" bs=1 count=4096 iflag=nonblock >/dev/null 2>&1 || true
# vi: ts=4 noexpandtab

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romtal-sistem-dondurma/scripts/init-bottom/overlayroot Executable file
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#!/bin/sh
# Copyright, 2012 Dustin Kirkland <kirkland@ubuntu.com>
# Copyright, 2012 Scott Moser <smoser@ubuntu.com>
# Copyright, 2012 Axel Heider
#
# Based on scripts from
# Sebastian P.
# Nicholas A. Schembri State College PA USA
# Axel Heider
# Dustin Kirkland
# Scott Moser
#
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see
# <http://www.gnu.org/licenses/>.
case "$1" in
# no pre-reqs
prereqs) echo ""; exit 0;;
esac
. /scripts/functions
PATH=/usr/sbin:/usr/bin:/sbin:/bin
MYTAG="overlayroot"
TEMP_D="${TMPDIR:-/tmp}/${0##*/}.configs"
VARIABLES="overlayroot overlayroot_cfgdisk"
# generic settings
# ${ROOT} and ${rootmnt} are predefined by caller of this script. Note that
# the root fs ${rootmnt} it mounted readonly on the initrams, which fits
# nicely for our purposes.
root_rw=/media/root-rw
root_ro=/media/root-ro
ROOTMNT=${rootmnt} # use global name to indicate created outside this
OVERLAYROOT_DEBUG=0
# PERSIST_DIR will persist after pivot-root. It is used for log file
# and for the mktemp-made password file in crypt.
PERSIST_DIR=/run/initramfs
if [ ! -d "$PERSIST_DIR" -a -d /dev/.initramfs ]; then
PERSIST_DIR="/dev/.initramfs"
fi
if [ ! -d "$PERSIST_DIR" ]; then
mkdir -p "$PERSIST_DIR" ||
echo "WARNING: $MYTAG: failed to create ${PERSIST_DIR}" 1>&2
fi
LOG_FILE="${PERSIST_DIR}/${MYTAG}.log"
log() {
"log_${1}_msg" "$MYTAG: $2";
_debug "[$1]:" "$2"
}
log_fail() { log failure "$*"; }
log_success() { log success "$*"; }
log_warn() { log warning "$*"; }
fail() {
[ $# -eq 0 ] || log_fail "$@";
exit 0; # why do we exit success?
}
cleanup() {
[ -d "${TEMP_D}" ] && rm -Rf "${TEMP_D}"
}
debug() {
_debug "$@"
[ "${OVERLAYROOT_DEBUG:-0}" = "0" ] && return
echo "$MYTAG:" "$@"
}
_debug() {
if [ "${DEBUG_BUSTED:-0}" ]; then
{ echo "$@" >> "$LOG_FILE"; } 2>/dev/null ||
{ DEBUG_BUSTED=1; log_warn "debug is busted"; }
fi
}
safe_string() {
local prev="$1" allowed="$2" cur=""
[ -n "$prev" ] || return 1
while cur="${prev#[${allowed}]}"; do
[ -z "$cur" ] && return 0
[ "$cur" = "$prev" ] && break
prev="$cur"
done
return 1
}
parse_string() {
# parse a key/value string like:
# name=mapper,pass=foo,fstype=ext4,mkfs=1
# set variables under namespace 'ns'.
# _RET_name=mapper
# _RET_pass=foo
# _RET_fstype=ext4
# set _RET to the list of variables found
local input="${1}" delim="${2:-,}" ns="${3:-_RET_}"
local oifs="$IFS" tok="" keys="" key="" val=""
set -f; IFS="$delim"; set -- $input; IFS="$oifs"; set +f;
_RET=""
for tok in "$@"; do
key="${tok%%=*}"
val="${tok#${key}}"
val=${val#=}
safe_string "$key" "0-9a-zA-Z_" ||
{ debug "$key not a safe variable name"; return 1; }
eval "${ns}${key}"='${val}' || return 1
keys="${keys} ${ns}${key}"
done
_RET=${keys# }
return
}
get_varval() { eval _RET='${'$1'}'; }
write_kernel_cmdline_cfg() {
local cfg="$1" desc="${2:-kernel cmdline}"
local cmdline="" var=""
read cmdline < /proc/cmdline || return 1
: > "${cfg}" || return
set -f
{
echo "desc='${desc}'"
for tok in $cmdline; do
for var in $VARIABLES; do
if [ "$tok" = "$var" ]; then
log_warn "kernel param without value '${tok}'";
continue;
elif [ "${tok}" = "${var}=" ]; then
echo "${var}=''";
elif [ "${tok#${var}=}" != "${tok}" ]; then
echo "${var}='${tok#${var}=}'"
fi
done
done
} >> "$cfg"
set +f
}
wait_for_dev() {
local dev="$1" timeout="${2:-0}"
[ -b "$dev" ] && return 0
[ "$timeout" = "0" ] && return 1
# wait-for-root writes fstype to stdout, redirect to null
wait-for-root "$dev" "$timeout" >/dev/null
}
crypto_setup() {
local fstype="ext4" pass="" mapname="secure" mkfs="1" dev=""
local timeout=0
local entropy_sources="/proc/sys/kernel/random/boot_id /proc/sys/kernel/random/uuid /dev/urandom"
local seed="" rootseed="$ROOTMNT/var/lib/urandom/random-seed"
if [ ! -f "$rootseed" -a -f "$ROOTMNT/var/lib/systemd/random-seed" ]; then
rootseed="$ROOTMNT/var/lib/systemd/random-seed"
fi
# Seed the psuedo random number generator with available seeds
for seed in "/.random-seed" "$rootseed"; do
[ -f "${seed}" ] ||
{ debug "missing rng seed [${seed}]"; continue; }
cat "${seed}" > /dev/urandom ||
debug "failed seeding /dev/urandom from $seed"
done
# this does necessary crypto setup and sets _RET
# to the appropriate block device (ie /dev/mapper/secure)
# mkfs (default is 1):
# 0: never create filesystem
# 1: if pass is given and mount fails, create a new one
# if no pass given, create new
# 2: if pass is given and mount fails, fail
# if no pass given, create new
local options="$1"
parse_string "${options}" ||
{ log_fail "failed parsing '${options}'"; return 1; }
fstype=${_RET_fstype:-${fstype}}
pass=${_RET_pass:-${pass}}
mapname=${_RET_mapname:-${mapname}}
mkfs=${_RET_mkfs:-${mkfs}}
dev=${_RET_dev:-${dev}}
timeout=${_RET_timeout:-${timeout}}
[ -n "$dev" ] ||
{ log_fail "dev= argument not provided in '${options}'"; return 1; }
short2dev "$dev" ||
{ log_fail "failed to convert $dev to a device"; return 1; }
dev="${_RET}"
debug "fstype=${fstype} pass=${pass} mapname=${mapname}"
debug "mkfs=${mkfs} dev=${dev} timeout=${timeout}"
wait_for_dev "$dev" "$timeout" || {
log_fail "crypt dev device $dev does not exist after ${timeout}s";
return 1;
}
if [ -n "$pass" ]; then
printf "%s" "$pass" |
cryptsetup luksOpen "$dev" "$mapname" --key-file -
if [ $? -eq 0 ]; then
local tdev="/dev/mapper/$mapname"
log_warn "reusing existing luks device at $dev"
wait_for_dev "$tdev" 20 ||
{ log_fail "$tdev did not appear"; return 1; }
_RET_DEVICE="/dev/mapper/$mapname"
return 0
fi
if [ "$mkfs" != "1" ]; then
log_fail "luksOpen failed on $dev with mkfs=$mkfs";
return 1;
fi
log_warn "re-opening $dev failed with mkfs=$mkfs will create new"
else
[ "$mkfs" = "0" ] &&
{ log_fail "mkfs=0, but no password provided"; return 1; }
entropy_sources="$entropy_sources $dev"
local tmpf="" pass_file="${PERSIST_DIR}/${MYTAG}.passwd"
tmpf=$(mktemp "${PERSIST_DIR}/${MYTAG}.XXXXXX") ||
{ log_fail "failed creation of password file"; return 1; }
stat -L /dev/* /proc/* /sys/* >"$tmpf" 2>&1 ||
{ log_warn "could not seed with stat entropy [$entropy_sources]"; }
head -c 4096 $entropy_sources >> "$tmpf" ||
{ log_fail "failed reading entropy [$entropy_sources]"; return 1; }
pass=$(sha512sum "$tmpf") ||
{ log_fail "failed generation of password"; return 1; }
pass=${pass%% *}
printf "%s" "${pass}" > "$tmpf" ||
{ log_fail "failed to record password to '$tmpf'"; return 1; }
mv "$tmpf" "${pass_file}" ||
{ log_fail "failed rename '$tmpf' to '${pass_file}'"; return 1; }
log_debug "stored password in ${pass_file}"
fi
log_warn "setting up new luks device at $dev"
# clear backing device
wipefs -a "$dev" ||
{ log_fail "failed to wipe $dev"; return 1; }
printf "%s" "$pass" | cryptsetup luksFormat "$dev" --key-file - ||
{ log_fail "luksFormat $dev failed"; return 1; }
printf "%s" "$pass" |
cryptsetup luksOpen "$dev" "$mapname" --key-file - ||
{ log_fail "luksOpen $dev failed"; return 1; }
mke2fs -t "${fstype}" "/dev/mapper/${mapname}" || {
log_fail "failed to mkfs -t $fstype on map $mapname";
return 1;
}
_RET_DEVICE="/dev/mapper/$mapname"
return 0
}
dev_setup() {
local options="$1" dev="" timeout=0 path="/"
# options supported:
# dev=device,timeout=X,path=/
parse_string "${options}" ||
{ log_fail "failed parsing '${options}'"; return 1; }
dev=${_RET_dev:-${dev}}
timeout=${_RET_timeout:-${timeout}}
[ -n "$dev" ] ||
{ log_fail "dev= argument not provided in '${options}'"; return 1; }
short2dev "$dev" ||
{ log_fail "failed to convert $dev to a device"; return 1; }
dev="${_RET}"
debug "dev=${dev} timeout=${timeout}"
wait_for_dev "$dev" "$timeout"
_RET_DEVICE="$dev"
}
clean_path() {
# remove '//' in a path.
local p="$1" tmp=""
while [ "${p#*//}" != "$p" ]; do
tmp=${p#*//}
p="${p%%//*}/${tmp}"
done
_RET="$p"
}
get_workdir() {
local root_rw="$1" dir_prefix="$2" file="$3"
file=${file%/}
if [ "$file" = "/" -o "$file" = "" ]; then
file="_"
fi
clean_path "${root_rw}/${dir_prefix%/}-workdir/${file}"
}
gen_fstab() {
# gen_fstab(mp) - generate a fabricated /etc/fstab for mount point $mp
local mp="$1" m_spec="" m_opts="" m_fstype=""
local spec file vfstype opts pass freq
# just remove any trailing /
[ "$mp" != "/" ] && mp=${mp%/}
while read spec file vfstype opts pass freq; do
[ "$file" = "$mp" ] && {
m_spec="$spec"
m_opts="$opts"
m_fstype="$vfstype"
break
}
done </proc/mounts
[ -z "$m_spec" ] && {
log_warn "did not find root mount point $mp in /proc/mounts"
m_opts="/dev/root"
m_opts="defaults"
m_fstype="auto"
}
echo "# fabricated by overlayroot, rootfs did not contain /etc/fstab"
echo "${m_spec} / ${m_fstype} ${m_opts} 0 0 "
}
overlayrootify_fstab() {
# overlayrootify_fstab(input, root_ro, root_rw, dir_prefix, recurse, swap)
# read input fstab file, write an overlayroot version to stdout
# also returns (_RET) a list of directories that will need to be made
local input="$1" root_ro="${2:-/media/root-ro}"
local root_rw="${3:-/media/root-rw}" dir_prefix="${4:-/}"
local recurse=${5:-1} swap=${6:-0} fstype=${7:-overlayfs}
local hash="#" oline="" ospec="" upper="" dirs="" copy_opts="" copy_opt=""
local spec file vfstype opts pass freq line ro_line
local workdir="" use_orig="" relfile="" needs_workdir=false noauto=""
[ -f "$input" ] || return 1
cat <<EOF
#
# This fstab is for overlayroot. The real one can be found at
# ${root_ro}/etc/fstab
# The original entry for '/' and other mounts have been updated to be placed
# under $root_ro.
# To permanently modify this (or any other file), you should change-root into
# a writable view of the underlying filesystem using:
# sudo overlayroot-chroot
#
EOF
needs_workdir && needs_workdir=true || needs_workdir=false
while read spec file vfstype opts pass freq; do
[ "$file" = "/" ] && noauto="noauto" || noauto=""
line="$spec $file $vfstype $opts $pass $freq"
case ",$opts," in
*,ro,*) ro_opts="$opts";;
*) ro_opts="ro,${opts}";;
esac
ro_line="$spec ${root_ro}$file $vfstype"
ro_line="${ro_line} ${ro_opts}${noauto:+,${noauto}} $pass $freq"
use_orig=""
if [ "${spec#${hash}}" != "$spec" ]; then
use_orig="comment"
elif [ -z "$freq" ]; then
use_orig="malformed-line"
else
case "$vfstype" in
vfat|fat) use_orig="fs-unsupported";;
proc|sys|tmpfs|dev|udev|debugfs) use_orig="fs-virtual";;
esac
fi
if [ -n "$use_orig" ]; then
if [ "$use_orig" != "comment" ]; then
echo "$line # $MYTAG:$use_orig"
else
echo "$line"
fi
elif [ "$vfstype" = "swap" ]; then
if [ "$swap" = "0" ]; then
# comment out swap lines
echo "#$MYTAG:swap=${swap}#${line}"
elif [ "${spec#/}" != "${spec}" ] &&
[ "${spec#/dev/}" = "${spec}" ]; then
# comment out swap files (spec starts with / and not in /dev)
echo "#$MYTAG:swapfile#${line}"
else
echo "${line}"
fi
else
ospec="${root_ro}${file}"
copy_opts=""
for copy_opt in nobootwait noauto nofail; do
case ",$opts," in
*,${copy_opt},*)
copy_opts="${copy_opts},${copy_opt}";;
esac
done
clean_path "${root_rw}/${dir_prefix}${file}"
upper="$_RET"
oline="${ospec} ${file} $fstype "
clean_path "${root_ro}${file}"
oline="${oline}lowerdir=$_RET"
oline="${oline},upperdir=${upper}${copy_opts}"
if [ "$fstype" = "overlayfs" -o "$fstype" = "overlay" ] &&
${needs_workdir}; then
get_workdir "$root_rw" "$dir_prefix" "$file"
workdir="$_RET"
oline="${oline},workdir=$workdir"
dirs="${dirs} $workdir"
fi
oline="${oline} $pass $freq"
if [ "$recurse" != "0" -o "$file" = "/" ]; then
if [ "$file" = "/" ]; then
# this can confuse systemd (LP: #1723183)
echo "#$ro_line"
else
echo "$ro_line"
fi
echo "$oline"
dirs="${dirs} ${upper}"
else
echo "$line"
fi
fi
done < "$input"
_RET=${dirs# }
}
short2dev() {
# turn 'LABEL=' or 'UUID=' into a device path
# also support /dev/* and 'vdb' or 'xvda'
local input="$1" oifs="$IFS" dev newdev s
case "$input" in
LABEL=*)
dev="${input#LABEL=}"
case "${dev}" in
*/*) dev="$(echo "${dev}" | sed 's,/,\\x2f,g')";;
esac
dev="/dev/disk/by-label/${dev}"
;;
UUID=*) dev="/dev/disk/by-uuid/${input#UUID=}" ;;
/dev/*) dev="${input}";;
*) dev="/dev/${input}";;
esac
_RET=$dev
}
get_cfg() {
# get_cfg(device, file, cfg, timeout=0)
# copy the file $cfg off $device to $file, waiting $timeout for
# $device to appear
local dev="$1" file="$2" cfg="${3:-overlayroot.conf}" timeout="${4:-0}"
local cfgdev="" success=0 didmnt=false mp="" pre="get_cfg($dev):"
[ -z "$dev" ] && return 1
if [ "$timeout" != "0" ]; then
wait_for_dev "$dev" "$timeout" ||
{ debug "$pre did not appear in $timeout"; return 1; }
else
udevadm settle
fi
short2dev "$dev" && cfgdev="$_RET" && [ -b "$cfgdev" ] ||
{ debug "$pre not present"; return 1; }
if mp="${TEMP_D}/mp" && mkdir "$mp" &&
mount -o ro "$cfgdev" "$mp"; then
if [ -f "$mp/$cfg" ]; then
cp "$mp/$cfg" "$file" && success=1 ||
debug "$pre copy failed"
else
debug "$pre '$file' file not found"
fi
umount "$mp"
else
debug "$pre mount failed"
fi
[ -d "$mp" ] || rmdir "$mp"
[ $success -eq 1 ] || return 1
_RET="$dev/$cfg"
}
parse_cfg() {
# parse_cfg($file,$desc,$vars)
# this reasonably safely sources the "config" file $file
# and then declares the variables listed to stdout
#
# known issues:
# * sourced file could re-define 'echo'
# * just fails if a value has a ' in it
[ -f "$1" ] || return 0
tick="'" sh -c '
__tick=$tick
__file=$1; __desc=$2;
__unset__="__unset__"
shift 2
__vars="$*"
readonly __tick __file __desc __vars
. "${__file}"
if [ $? -ne 0 ]; then
echo "failed source \"${__file}\" ($__desc)" 1>&2
return 1
fi
set -e
echo "desc=${__tick}${__desc}${__tick}"
for var in ${__vars}; do
eval val=\${${var}-${__unset__}} ||
{ echo "eval of $var failed"; exit 1; }
[ "${val#*${__tick}}" = "${val}" ] || {
echo "variable \"$var\" had single tick in it. fail";
exit 1;
}
[ "${val}" = "${__unset__}" ] ||
echo "$var=${__tick}${val}${__tick}"
done
' -- "$@"
}
readcfgd() {
local cfg_d="$1"
# this kind of stinks, each VARIABLE goes into global scope
local or="" or_cfgdisk=""
_RET_desc_oroot=""
_RET_desc_cfgdisk=""
set +f
for f in "${cfg_d}"/*; do
. "$f" || fail "failed reading $f"
[ "$or" != "${overlayroot}" ] &&
_RET_desc_oroot="$desc"
[ "${or_cfgdisk}" != "${overlayroot_cfgdisk}" ] &&
_RET_desc_cfgdisk="$desc"
or=${overlayroot}
or_cfgdisk=${overlayroot_cfgdisk}
done
set -f
}
fix_upstart_overlayfs() {
# inotify events on an overlayfs underlay do not propogate through
# a newly created overlay. This causes job creation and deletion issues
# for upstart, which uses inotify on /etc/init. So ensure that the overlay
# explicitly has a /etc/init (LP: #1213925)
local root="$1"
local initctl="$root/sbin/initctl"
local eifile="/etc/init/.overlayfs-upstart-helper"
[ -e "$initctl" -o -L "$initctl" ] || return 0
[ -d "$root/etc/init" ] || return 0
echo "#upstart needs help for overlayfs (LP: #1213925)." \
> "$root/$eifile" ||
{ log_fail "failed to write $root/$eifile"; return 1; }
debug "created $eifile under $root (LP: #1213925)"
}
needs_workdir() {
local uname_r="${UNAME_R}"
if [ -z "$uname_r" ]; then
uname_r=$(uname -r) && UNAME_R="$uname_r" ||
{ log_warn "failed to read uname!"; return 2; }
fi
# 3.18+ require 'workdir=' option.
case "${uname_r}" in
2*|3.1[01234567]*|3.[0-9].*) return 1;;
*) return 0;;
esac
}
search_fs_driver() {
# search_fs_driver(driver1, driver2...)
# return the first supported filesystem driver in the list.
# if no drivers are provided, search default list.
# assumes that name in /proc/filesystems and module name are the same.
local m="" driver="" tab=' '
for m in "$@"; do
grep -q "${tab}$m$" /proc/filesystems && driver="$m" &&
{ debug "/proc/filesystems support for '$m'"; break; }
done
if [ -z "$driver" ]; then
for m in "$@"; do
if modprobe -qb "$m"; then
if grep -q "${tab}$m$" /proc/filesystems; then
debug "loaded module '$m'";
driver="$m"
break;
else
log_warn "loaded '$m' module but no '$m' in /proc/filesystems"
fi
fi
done
fi
[ -n "$driver" ] ||
{ debug "Unable to find driver/module. searched: $*"; return 1; }
_RET="$driver"
}
cfgd="${TEMP_D}/configs"
mkdir -p "${cfgd}" || fail "failed to create tempdir"
trap cleanup EXIT
# collect the different config locations into a file
# write individual config files in $cfgd that contain
{
echo "desc='builtin'"
echo "overlayroot=''"
echo "overlayroot_cfgdisk='disabled'"
} > "$cfgd/00-builtin"
write_kernel_cmdline_cfg "${cfgd}/90-kernel" ||
fail "failed to read kernel command line!"
parse_cfg "/conf/conf.d/overlayroot" "initramfs config" \
"$VARIABLES" > "${cfgd}/10-initramfs" ||
fail "failed parsing initramfs config"
parse_cfg "${ROOTMNT}/etc/overlayroot.conf" "$ROOT/etc/overlayroot.conf" \
"$VARIABLES" > "${cfgd}/20-root-config" ||
fail "failed parsing root config"
parse_cfg "${ROOTMNT}/etc/overlayroot.local.conf" \
"$ROOT/etc/overlayroot.local.conf" \
"$VARIABLES" > "${cfgd}/30-root-local-config" ||
fail "failed parsing root config"
# now read the trusted configs, to see if overlayroot_cfgdisk is set
readcfgd "$cfgd" ||
fail "reading configs failed"
used_desc="${_RET_desc_oroot}"
[ -n "${_RET_desc_cfgdisk}" ] &&
debug "${_RET_desc_cfgdisk} set cfgdisk='${overlayroot_cfgdisk}'"
# if one of the trusted configs above gave us set the overlayroot_cfgdisk
# variable, then look for such a device and read a config from it.
cfgdisk=0
if [ "${overlayroot_cfgdisk:-disabled}" != "disabled" ] &&
get_cfg "${overlayroot_cfgdisk}" "${TEMP_D}/cfgdisk"; then
desc=${_RET}
parse_cfg "${TEMP_D}/cfgdisk" "${desc}" "$VARIABLES" \
> "${cfgd}/80-cfgdisk" ||
fail "reading config from ${desc} failed"
used_desc="${_RET_desc_oroot}"
# now read the parsed configs again.
readcfgd "$cfgd" ||
fail "reading configs failed"
[ -n "${_RET_desc_cfgdisk}" ] &&
debug "${_RET_desc_cfgdisk} set cfgdisk=${overlayroot_cfgdisk}"
[ -n "${_RET_desc_oroot}" ] &&
debug "${_RET_desc_oroot} set overlayroot=${overlayroot}"
fi
opts=""
cfgmsg="${used_desc:+ (per ${used_desc})}"
case "${overlayroot:-disabled}" in
tmpfs|tmpfs:*)
mode="tmpfs"
opts="${overlayroot#tmpfs}";
opts=${opts#:}
;;
/dev/*|device:*)
case "$overlayroot" in
/dev/*) opts="dev=${overlayroot}";;
*) opts="${overlayroot#device:}";;
esac
dev_setup "${opts}" ||
fail "failed setup overlay for ${overlayroot} [$opts]${cfgmsg}"
mode="device"
device="$_RET_DEVICE"
;;
crypt:*)
mode="crypt"
opts=${overlayroot#crypt:}
crypto_setup "${opts}" ||
fail "failed setup crypt for ${overlayroot}${cfgmsg}"
device="$_RET_DEVICE"
;;
disabled)
debug "overlayroot disabled${cfgmsg}"
exit 0;;
*)
fail "invalid value for overlayroot: ${overlayroot}${cfgmsg}"
exit 0;;
esac
parse_string "$opts" "," _RET_common_
swap=${_RET_common_swap:-0}
recurse=${_RET_common_recurse:-1}
OVERLAYROOT_DEBUG=${_RET_common_debug:-${OVERLAYROOT_DEBUG}}
dir_prefix=${_RET_common_dir:-"/overlay"}
overlayroot_driver=${_RET_common_driver}
read cmdline </proc/cmdline
cmdline=" $cmdline "
[ "${cmdline#* ro }" != "$cmdline" ] && cmdline_ro=true || cmdline_ro=false
if [ "${overlayroot_driver:-auto}" = "auto" ]; then
search_fs_driver overlay overlayfs ||
fail "Unable to find a driver. searched: overlay overlayfs"
overlayroot_driver="$_RET"
else
search_fs_driver ${overlayroot_driver} ||
fail "Unable to find a driver named '${overlayroot_driver}'"
overlayroot_driver="$_RET"
fi
debug "swap=$swap recurse=$recurse debug=$OVERLAYROOT_DEBUG dir=$dir_prefix"
debug "device=$device mode=$mode driver=${overlayroot_driver}"
[ "$swap" = "0" -o "$swap" = "1" ] ||
fail "invalid setting for swap: $swap. must be '0' or '1'"
[ "$recurse" = "0" -o "$recurse" = "1" ] ||
fail "invalid setting for recurse: $recurse. must be '0' or '1'"
log_warn "configuring overlayroot with driver=${overlayroot_driver} mode=$mode opts='$opts' per $used_desc"
# settings based on overlayroot_driver
workdir=""
case "${overlayroot_driver}" in
overlayfs|overlay)
mount_type="${overlayroot_driver}"
mount_opts="-o lowerdir=${root_ro},upperdir=${root_rw}/${dir_prefix}"
if needs_workdir; then
get_workdir "$root_rw" "$dir_prefix" "/"
workdir="$_RET"
mount_opts="${mount_opts},workdir=$workdir"
fi
clean_path "${mount_opts} overlayroot ${ROOTMNT}"
mount_opts="$_RET"
;;
aufs)
mount_type="aufs"
mount_opts="-o dirs=${root_rw}/${dir_prefix}:${root_ro}=ro aufs-root ${ROOTMNT}"
;;
*)
log_fail "invalid overlayroot driver: ${overlayroot_driver}"
panic "$MYTAG"
;;
esac
# make the mount point on the init root fs ${root_rw}
mkdir -p "${root_rw}" ||
fail "failed to create ${root_rw}"
# make the mount point on the init root fs ${root_ro}
mkdir -p "${root_ro}" ||
fail "failed to create ${root_ro}"
# mount the backing device to $root_rw
if [ "$mode" = "tmpfs" ]; then
# mount a tmpfs using the device name tmpfs-root
mount -t tmpfs tmpfs-root "${root_rw}" ||
fail "failed to create tmpfs"
else
# dev or crypto
mount "$device" "${root_rw}" ||
fail "failed mount backing device $device"
fi
mkdir -p "${root_rw}/${dir_prefix}" ||
fail "failed to create ${dir_prefix} on ${device}"
[ -z "$workdir" ] || mkdir -p "$workdir" ||
fail "failed to create workdir '$workdir' on ${device}"
# root is mounted on ${ROOTMNT}, move it to ${ROOT_RO}.
mount --move "${ROOTMNT}" "${root_ro}" ||
fail "failed to move root away from ${ROOTMNT} to ${root_ro}"
# there is nothing left at ${ROOTMNT} now. So for any error we get we should
# either do recovery to restore ${ROOTMNT} for drop to a initramfs shell using
# "panic". Otherwise the boot process is very likely to fail with even more
# errors and leave the system in a wired state.
# mount virtual fs ${ROOTMNT} with rw-fs ${root_rw} on top or ro-fs ${root_ro}.
debug mount -t "$mount_type" $mount_opts
mount -t "$mount_type" $mount_opts
if [ $? -ne 0 ]; then
log_fail "failed to create new ro/rw layered ${ROOTMNT}"
log_fail "mount command was: mount -t $mount_type $mount_opts"
# do recovery and try restoring the mount for ${ROOTMNT}
mount --move ${root_ro} ${ROOTMNT}
if [ $? -ne 0 ]; then
# thats bad, drop to shell to let the user try fixing this
log_fail "RECOVERY_ERROR: failed to move $root_ro back to ${ROOTMNT}"
panic "$MYTAG"
fi
exit 0
fi
# now the real root fs is on ${root_ro} of the init file system, our
# layered root fs is set up at ${ROOTMNT}. So we can write anywhere in
# {ROOTMNT} and the changes will end up in ${root_rw} while ${root_ro} it
# not touched. However ${root_ro} and ${root_rw} are on the initramfs root
# fs, which will be removed an replaced by ${ROOTMNT}. Thus we must move
# ${root_ro} and ${root_rw} to the rootfs visible later, ie.
# ${ROOTMNT}${root_ro} and ${ROOTMNT}${root_ro}. Since the layered ro/rw
# is already up, these changes also end up on ${root_rw} while ${root_ro}
# is not touched.
# move mount from ${root_ro} to ${ROOTMNT}${root_ro}
mkdir -p "${ROOTMNT}/${root_ro}"
mount --move ${root_ro} "${ROOTMNT}${root_ro}" ||
fail "failed to move ${root_ro} to ${ROOTMNT}${root_ro}"
# move mount from ${root_rw} to ${ROOTMNT}${root_rw}
[ -d ${ROOTMNT}${root_rw} ] || mkdir -p ${ROOTMNT}${root_rw}
mount --move "${root_rw}" "${ROOTMNT}${root_rw}" ||
fail "failed to move ${root_rw} to ${ROOTMNT}${root_rw}"
# technically, everything is set up nicely now. Since ${ROOTMNT} had beend
# mounted read-only on the initfamfs already, ${ROOTMNT}${root_ro} is it,
# too. Now we init process could run - but unfortunately, we may have to
# prepare some more things here.
# Basically, there are two ways to deal with the read-only root fs. If the
# system is made aware of this, things can be simplified a lot. If it is
# not, things need to be done to our best knowledge.
#
# So we assume here, the system does not really know about our read-only
# root fs.
#
# Let's deal with /etc/fstab first. It usually contains an entry for the
# root fs, which is no longer valid now. We have to remove it and add our
# new ${root_ro} entry.
# Remember we are still on the initramfs root fs here, so we have to work
# on ${ROOTMNT}/etc/fstab. The original fstab is
# ${ROOTMNT}${root_ro}/etc/fstab.
source_fstab="$ROOTMNT/${root_ro}/etc/fstab"
if [ ! -f "$source_fstab" ] && [ "$cmdline_ro" = "true" ]; then
debug "rootfs did not contain /etc/fstab, creating" \
"based on kernel cmdline"
source_fstab="${TEMP_D}/fstab"
gen_fstab "${ROOTMNT}${root_ro}" > "$source_fstab" ||
log_fail "gen_fstab failed for $ROOTMNT/$root_ro"
fi
if [ -f "$source_fstab" ]; then
overlayrootify_fstab "$source_fstab" "$root_ro" \
"$root_rw" "$dir_prefix" "$recurse" "$swap" "${overlayroot_driver}" \
> "${ROOTMNT}/etc/fstab" ||
log_fail "failed to modify /etc/fstab"
else
debug "rootfs did not contain /etc/fstab."
fi
# we have to make the directories in ${root_rw} because if they do not
# exist, then the 'upper=' argument to overlayfs will fail.
for d in ${_RET}; do
mkdir -p "${ROOTMNT}/$d"
done
if [ "${overlayroot_driver}" = "overlayfs" ]; then
fix_upstart_overlayfs "$ROOTMNT" ||
log_fail "failed to fix upstart for overlayfs"
fi
# if / is supposed to be mounted read-only (cmdline with 'ro')
# then mount our overlayfs as read-only just to be more normal
if [ "${cmdline_ro}" = "true" ]; then
mount -o remount,ro "$ROOTMNT" ||
log_fail "failed to remount overlayroot read-only"
debug "mounted $ROOTMNT read-only per kernel cmdline"
fi
msg="configured root with '$overlayroot' using ${overlayroot_driver} per"
msg="$msg ${used_desc}"
log_success "$msg"
exit 0
# vi: ts=4 noexpandtab

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#!/bin/sh
#
# overlayroot-chroot - chroot wrapper script for overlayroot
# Copyright (C) 2012 Dustin Kirkland <kirkland@ubuntu.com>
#
# Authors: Dustin Kirkland <kirkland@ubuntu.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -e
set -f # disable path expansion
REMOUNTS=""
error() {
printf "ERROR: $@\n" 1>&2
}
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
info() {
printf "INFO: $@\n" 1>&2
}
get_lowerdir() {
local overlay=""
overlay=$(awk \
'$1 == "overlayroot" && $2 == "/" { print $0 }' /proc/mounts)
if [ -n "${overlay}" ]; then
lowerdir=${overlay##*lowerdir=}
lowerdir=${lowerdir%%,*}
if mountpoint "${lowerdir}" >/dev/null; then
_RET="${lowerdir}"
else
fail "Unable to find the overlayroot lowerdir"
fi
else
fail "Unable to find an overlayroot filesystem"
fi
}
clean_exit() {
local mounts="$1" rc=0 d="" lowerdir="" mp=""
for d in ${mounts}; do
if mountpoint ${d} >/dev/null; then
umount ${d} || rc=1
fi
done
for mp in $REMOUNTS; do
mount -o remount,ro "${mp}" ||
error "Note that [${mp}] is still mounted read/write"
done
[ "$2" = "return" ] && return ${rc} || exit ${rc}
}
# Try to find the overlayroot filesystem
get_lowerdir
lowerdir=${_RET}
recurse_mps=$(awk '$1 ~ /^\/dev\// && $2 ~ starts { print $2 }' \
starts="^$lowerdir/" /proc/mounts)
mounts=
for d in proc run sys; do
if ! mountpoint "${lowerdir}/${d}" >/dev/null; then
mount -o bind "/${d}" "${lowerdir}/${d}" || fail "Unable to bind /${d}"
mounts="$mounts $lowerdir/$d"
trap "clean_exit \"${mounts}\" || true" EXIT HUP INT QUIT TERM
fi
done
# Remount with read/write
for mp in "$lowerdir" $recurse_mps; do
mount -o remount,rw "${mp}" &&
REMOUNTS="$mp $REMOUNTS" ||
fail "Unable to remount [$mp] writable"
done
info "Chrooting into [${lowerdir}]"
chroot ${lowerdir} "$@"
# Clean up mounts on exit
clean_exit "${mounts}" "return"
trap "" EXIT HUP INT QUIT TERM
# vi: ts=4 noexpandtab

21
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.TH overlayroot-chroot 8 "20 July 2012" overlayroot-chroot "initramfs-tools-overlayroot"
.SH NAME
\fBoverlayroot-chroot\fP - chroot into the lower filesystem in a writable mode
.SH SYNOPSIS
\fBoverlayroot-chroot\fP [COMMAND [ARG]...]
.SH DESCRIPTION
\fBoverlayroot-chroot\fP is a program that sets up bind mounts for \fI/proc\fP, \fI/run\fP, and \fI/sys\fP, remounts the lower directory in an overlayfs with write capabilities and will \fBchroot\fP(8) into it. Upon exit, the bind mounts are unmounted.
Any [COMMAND [ARG]...] are passed directly through to \fBchroot\fP(8).
.SH SEE ALSO
.TP
\fBchroot\fP(8)
.PD
.SH AUTHOR
This manpage and the utility were written by Dustin Kirkland <kirkland@ubuntu.com> for Ubuntu systems (but may be used by others). Permission is granted to copy, distribute and/or modify this document and the utility under the terms of the GNU General Public License, Version 3 published by the Free Software Foundation.
The complete text of the GNU General Public License can be found in \fI/usr/share/common-licenses/GPL\fP on Debian/Ubuntu systems, or on the web at \fIhttp://www.gnu.org/licenses/gpl.txt\fP.