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- #!/bin/sh
- # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
- # ex: ts=8 sw=4 sts=4 et filetype=sh
- #
- # Licensed under the GPLv2
- #
- # Copyright 2008-2010, Red Hat, Inc.
- # Harald Hoyer <harald@redhat.com>
- # Jeremy Katz <katzj@redhat.com>
- export -p > /tmp/export.orig
- NEWROOT="/sysroot"
- [ -d $NEWROOT ] || mkdir -p -m 0755 $NEWROOT
- OLDPATH=$PATH
- PATH=/usr/sbin:/usr/bin:/sbin:/bin
- export PATH
- RD_DEBUG=""
- . /lib/dracut-lib.sh
- trap "emergency_shell Signal caught!" 0
- [ -c /dev/null ] || mknod -m 0666 /dev/null c 1 3
- # mount some important things
- [ ! -d /proc/self ] && \
- mount -t proc -o nosuid,noexec,nodev proc /proc >/dev/null 2>&1
- [ ! -d /sys/kernel ] && \
- mount -t sysfs -o nosuid,noexec,nodev sysfs /sys >/dev/null 2>&1
- if [ -x /lib/systemd/systemd-timestamp ]; then
- RD_TIMESTAMP=$(/lib/systemd/systemd-timestamp)
- else
- read RD_TIMESTAMP _tmp < /proc/uptime
- unset _tmp
- fi
- setdebug
- if [ "$RD_DEBUG" = "yes" ]; then
- getarg quiet && DRACUT_QUIET="yes"
- a=$(getarg loglevel=)
- [ -n "$a" ] && [ $a -ge 8 ] && unset DRACUT_QUIET
- fi
- if ! ismounted /dev; then
- mount -t devtmpfs -o mode=0755,nosuid,strictatime devtmpfs /dev >/dev/null
- fi
- # prepare the /dev directory
- [ ! -h /dev/fd ] && ln -s /proc/self/fd /dev/fd >/dev/null 2>&1
- [ ! -h /dev/stdin ] && ln -s /proc/self/fd/0 /dev/stdin >/dev/null 2>&1
- [ ! -h /dev/stdout ] && ln -s /proc/self/fd/1 /dev/stdout >/dev/null 2>&1
- [ ! -h /dev/stderr ] && ln -s /proc/self/fd/2 /dev/stderr >/dev/null 2>&1
- if ! ismounted /dev/pts; then
- mkdir -m 0755 /dev/pts
- mount -t devpts -o gid=5,mode=620,noexec,nosuid devpts /dev/pts >/dev/null
- fi
- if ! ismounted /dev/shm; then
- mkdir -m 0755 /dev/shm
- mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime tmpfs /dev/shm >/dev/null
- fi
- if ! ismounted /run; then
- mkdir -m 0755 /newrun
- mount -t tmpfs -o mode=0755,nosuid,nodev,strictatime tmpfs /newrun >/dev/null
- cp -a /run/* /newrun >/dev/null 2>&1
- mount --move /newrun /run
- rm -fr /newrun
- fi
- [ -d /run/initramfs ] || mkdir -p -m 0755 /run/initramfs
- UDEVVERSION=$(udevadm --version)
- if [ $UDEVVERSION -gt 166 ]; then
- # newer versions of udev use /run/udev/rules.d
- export UDEVRULESD=/run/udev/rules.d
- [ -d /run/udev ] || mkdir -p -m 0755 /run/udev
- [ -d $UDEVRULESD ] || mkdir -p -m 0755 $UDEVRULESD
- else
- mkdir -m 0755 /dev/.udev /dev/.udev/rules.d
- export UDEVRULESD=/dev/.udev/rules.d
- fi
- if [ "$RD_DEBUG" = "yes" ]; then
- mkfifo /run/initramfs/loginit.pipe
- loginit $DRACUT_QUIET </run/initramfs/loginit.pipe >/dev/console 2>&1 &
- exec >/run/initramfs/loginit.pipe 2>&1
- else
- exec 0<>/dev/console 1<>/dev/console 2<>/dev/console
- fi
- source_conf /etc/conf.d
- # run scriptlets to parse the command line
- getarg 'rd.break=cmdline' 'rdbreak=cmdline' && emergency_shell -n cmdline "Break before cmdline"
- source_hook cmdline
- [ -z "$root" ] && die "No or empty root= argument"
- [ -z "$rootok" ] && die "Don't know how to handle 'root=$root'"
- export root rflags fstype netroot NEWROOT
- # pre-udev scripts run before udev starts, and are run only once.
- getarg 'rd.break=pre-udev' 'rdbreak=pre-udev' && emergency_shell -n pre-udev "Break before pre-udev"
- source_hook pre-udev
- # start up udev and trigger cold plugs
- udevd --daemon --resolve-names=never
- UDEV_LOG_PRIO_ARG=--log-priority
- UDEV_QUEUE_EMPTY="udevadm settle --timeout=0"
- if [ $UDEVVERSION -lt 140 ]; then
- UDEV_LOG_PRIO_ARG=--log_priority
- UDEV_QUEUE_EMPTY="udevadm settle --timeout=1"
- fi
- getargbool 0 rd.udev.info -y rdudevinfo && udevadm control "$UDEV_LOG_PRIO_ARG=info"
- getargbool 0 rd.udev.debug -y rdudevdebug && udevadm control "$UDEV_LOG_PRIO_ARG=debug"
- udevproperty "hookdir=$hookdir"
- getarg 'rd.break=pre-trigger' 'rdbreak=pre-trigger' && emergency_shell -n pre-trigger "Break before pre-trigger"
- source_hook pre-trigger
- udevadm control --reload >/dev/null 2>&1 || :
- # then the rest
- udevadm trigger --type=subsystems --action=add >/dev/null 2>&1
- udevadm trigger --type=devices --action=add >/dev/null 2>&1
- getarg 'rd.break=initqueue' 'rdbreak=initqueue' && emergency_shell -n initqueue "Break before initqueue"
- RDRETRY=$(getarg rd.retry 'rd_retry=')
- RDRETRY=${RDRETRY:-20}
- RDRETRY=$(($RDRETRY*2))
- export RDRETRY
- main_loop=0
- export main_loop
- while :; do
- check_finished && break
- udevsettle
- check_finished && break
- if [ -f $hookdir/initqueue/work ]; then
- rm $hookdir/initqueue/work
- fi
- for job in $hookdir/initqueue/*.sh; do
- [ -e "$job" ] || break
- job=$job . $job
- check_finished && break 2
- done
- $UDEV_QUEUE_EMPTY >/dev/null 2>&1 || continue
- for job in $hookdir/initqueue/settled/*.sh; do
- [ -e "$job" ] || break
- job=$job . $job
- check_finished && break 2
- done
- $UDEV_QUEUE_EMPTY >/dev/null 2>&1 || continue
- # no more udev jobs and queues empty.
- sleep 0.5
- if [ $main_loop -gt $(($RDRETRY/2)) ]; then
- for job in $hookdir/initqueue/timeout/*.sh; do
- [ -e "$job" ] || break
- job=$job . $job
- main_loop=0
- done
- fi
- main_loop=$(($main_loop+1))
- [ $main_loop -gt $RDRETRY ] \
- && { flock -s 9 ; emergency_shell "Unable to process initqueue"; } 9>/.console_lock
- done
- unset job
- unset queuetriggered
- unset main_loop
- unset RDRETRY
- # pre-mount happens before we try to mount the root filesystem,
- # and happens once.
- getarg 'rd.break=pre-mount' 'rdbreak=pre-mount' && emergency_shell -n pre-mount "Break pre-mount"
- source_hook pre-mount
- getarg 'rd.break=mount' 'rdbreak=mount' && emergency_shell -n mount "Break mount"
- # mount scripts actually try to mount the root filesystem, and may
- # be sourced any number of times. As soon as one suceeds, no more are sourced.
- i=0
- while :; do
- if ismounted "$NEWROOT"; then
- usable_root "$NEWROOT" && break;
- umount "$NEWROOT"
- fi
- for f in $hookdir/mount/*.sh; do
- [ -f "$f" ] && . "$f"
- if ismounted "$NEWROOT"; then
- usable_root "$NEWROOT" && break;
- warn "$NEWROOT has no proper rootfs layout, ignoring and removing offending mount hook"
- umount "$NEWROOT"
- rm -f "$f"
- fi
- done
- i=$(($i+1))
- [ $i -gt 20 ] \
- && { flock -s 9 ; emergency_shell "Can't mount root filesystem"; } 9>/.console_lock
- done
- {
- echo -n "Mounted root filesystem "
- while read dev mp rest; do [ "$mp" = "$NEWROOT" ] && echo $dev; done < /proc/mounts
- } | vinfo
- # pre pivot scripts are sourced just before we doing cleanup and switch over
- # to the new root.
- getarg 'rd.break=pre-pivot' 'rdbreak=pre-pivot' && emergency_shell -n pre-pivot "Break pre-pivot"
- source_hook pre-pivot
- # pre pivot cleanup scripts are sourced just before we switch over to the new root.
- getarg 'rd.break=pre-pivot-cleanup' 'rdbreak=pre-pivot-cleanup' && emergency_shell -n pre-pivot-cleanup "Break pre-pivot-cleanup"
- source_hook pre-pivot-cleanup
- # By the time we get here, the root filesystem should be mounted.
- # Try to find init.
- for i in "$(getarg real_init=)" "$(getarg init=)" $(getargs rd.distroinit=) /sbin/init; do
- [ -n "$i" ] || continue
- __p=$(readlink -f "${NEWROOT}/${i}")
- if [ -x "$__p" ]; then
- INIT="$i"
- break
- fi
- done
- [ "$INIT" ] || {
- echo "Cannot find init!"
- echo "Please check to make sure you passed a valid root filesystem!"
- emergency_shell
- }
- if [ $UDEVVERSION -lt 168 ]; then
- # stop udev queue before killing it
- udevadm control --stop-exec-queue
- HARD=""
- while pidof udevd >/dev/null 2>&1; do
- for pid in $(pidof udevd); do
- kill $HARD $pid >/dev/null 2>&1
- done
- HARD="-9"
- done
- else
- udevadm control --exit
- udevadm info --cleanup-db
- fi
- # Retain the values of these variables but ensure that they are unexported
- # This is a POSIX-compliant equivalent of bash's "export -n"
- for var in root rflags fstype netroot NEWROOT; do
- eval tmp=\$$var
- unset $var
- [ -n "$tmp" ] && eval $var=\"$tmp\"
- done
- export RD_TIMESTAMP
- set +x # Turn off debugging for this section
- # Clean up the environment
- for i in $(export -p); do
- i=${i#declare -x}
- i=${i#export}
- strstr "$i" "=" || continue
- i=${i%%=*}
- [ -z "$i" ] && continue
- case $i in
- root|PATH|HOME|TERM|PS4|RD_*)
- :;;
- *)
- unset "$i";;
- esac
- done
- . /tmp/export.orig 2>/dev/null || :
- rm -f /tmp/export.orig
- initargs=""
- read CLINE </proc/cmdline
- if getarg init= >/dev/null ; then
- set +x # Turn off debugging for this section
- ignoreargs="console BOOT_IMAGE"
- # only pass arguments after init= to the init
- CLINE=${CLINE#*init=}
- set -- $CLINE
- shift # clear out the rest of the "init=" arg
- for x in "$@"; do
- for s in $ignoreargs; do
- [ "${x%%=*}" = $s ] && continue 2
- done
- initargs="$initargs $x"
- done
- unset CLINE
- else
- set +x # Turn off debugging for this section
- set -- $CLINE
- for x in "$@"; do
- case "$x" in
- [0-9]|s|S|single|emergency|auto ) \
- initargs="$initargs $x"
- ;;
- esac
- done
- fi
- [ "$RD_DEBUG" = "yes" ] && set -x
- if ! [ -d "$NEWROOT"/run ]; then
- NEWRUN=/dev/.initramfs
- mkdir -m 0755 "$NEWRUN"
- mount --rbind /run/initramfs "$NEWRUN"
- fi
- wait_for_loginit
- # remove helper symlink
- [ -h /dev/root ] && rm -f /dev/root
- getarg rd.break rdbreak && emergency_shell -n switch_root "Break before switch_root"
- info "Switching root"
- source_hook cleanup
- unset PS4
- CAPSH=$(command -v capsh)
- SWITCH_ROOT=$(command -v switch_root)
- PATH=$OLDPATH
- export PATH
- if [ -f /etc/capsdrop ]; then
- . /etc/capsdrop
- info "Calling $INIT with capabilities $CAPS_INIT_DROP dropped."
- unset RD_DEBUG
- exec $CAPSH --drop="$CAPS_INIT_DROP" -- \
- -c "exec switch_root \"$NEWROOT\" \"$INIT\" $initargs" || \
- {
- warn "Command:"
- warn capsh --drop=$CAPS_INIT_DROP -- -c exec switch_root "$NEWROOT" "$INIT" $initargs
- warn "failed."
- emergency_shell
- }
- else
- unset RD_DEBUG
- exec $SWITCH_ROOT "$NEWROOT" "$INIT" $initargs || {
- warn "Something went very badly wrong in the initramfs. Please "
- warn "file a bug against dracut."
- emergency_shell
- }
- fi
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