summaryrefslogtreecommitdiff
path: root/romtal-sistem-dondurma/scripts
diff options
context:
space:
mode:
Diffstat (limited to 'romtal-sistem-dondurma/scripts')
-rwxr-xr-xromtal-sistem-dondurma/scripts/init-bottom/overlayroot878
1 files changed, 878 insertions, 0 deletions
diff --git a/romtal-sistem-dondurma/scripts/init-bottom/overlayroot b/romtal-sistem-dondurma/scripts/init-bottom/overlayroot
new file mode 100755
index 0000000..5c13811
--- /dev/null
+++ b/romtal-sistem-dondurma/scripts/init-bottom/overlayroot
@@ -0,0 +1,878 @@
+#!/bin/sh
+# Copyright, 2012 Dustin Kirkland <[email protected]>
+# Copyright, 2012 Scott Moser <[email protected]>
+# 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
generated by cgit v1.2.3 (git 2.39.1) at 2025-03-14 22:41:58 +0000