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