kexec-tools/kdump_initscripts/init

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#!/bin/sh
#
# Licensed under the GPLv2
#
# Copyright 2008, Red Hat, Inc.
# Jeremy Katz <katzj@redhat.com>
emergency_shell()
{
exec >/dev/console 2>&1 </dev/console
echo ; echo
echo $@
source_all emergency
echo
if getarg rdshell || getarg rdbreak; then
echo "Dropping to debug shell."
echo
sh -i
else
echo "Boot has failed, sleeping forever."
while :; do sleep 365d;done
fi
}
export PATH=/sbin:/bin:/usr/sbin:/usr/bin
export TERM=linux
NEWROOT="/sysroot"
trap "emergency_shell Signal caught!" 0
. /lib/dracut-lib.sh
mknod /dev/null c 1 3
# mount some important things
mount -t proc /proc /proc >/dev/null 2>&1
mount -t sysfs /sys /sys >/dev/null 2>&1
if [ ! -c /dev/ptmx ]; then
# try to mount devtmpfs
if ! mount -t devtmpfs -omode=0755 udev /dev >/dev/null 2>&1; then
# if it failed fall back to normal tmpfs
mount -t tmpfs -omode=0755 udev /dev >/dev/null 2>&1
# Make some basic devices first, let udev handle the rest
mknod /dev/null c 1 3
mknod /dev/ptmx c 5 2
mknod /dev/console c 5 1
mknod /dev/kmsg c 1 11
fi
fi
if getarg rdinitdebug; then
set -x
fi
mkdir /dev/shm
mkdir /dev/pts
mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts >/dev/null 2>&1
UDEVVERSION=$(udevadm --version)
source_conf /etc/conf.d
# run scriptlets to parse the command line
getarg 'rdbreak=cmdline' && emergency_shell "Break before cmdline"
source_all cmdline
[ -z "$root" ] && die "No or empty root= argument"
[ -z "$rootok" ] && die "Don't know how to handle 'root=$root'"
# Network root scripts may need updated root= options,
# so deposit them where they can see them (udev purges the env)
{
echo "root='$root'"
echo "rflags='$rflags'"
echo "fstype='$fstype'"
echo "netroot='$netroot'"
echo "NEWROOT='$NEWROOT'"
} > /tmp/root.info
# pre-udev scripts run before udev starts, and are run only once.
getarg 'rdbreak=pre-udev' && emergency_shell "Break before pre-udev"
source_all pre-udev
# start up udev and trigger cold plugs
udevd --daemon
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
getarg rdudevinfo && udevadm control $UDEV_LOG_PRIO_ARG=info
getarg rdudevdebug && udevadm control $UDEV_LOG_PRIO_ARG=debug
getarg 'rdbreak=pre-trigger' && emergency_shell "Break before pre-trigger"
source_all pre-trigger
# then the rest
udevadm trigger $udevtriggeropts >/dev/null 2>&1
getarg 'rdbreak=initqueue' && emergency_shell "Break before initqueue"
i=0
while :; do
# bail out, if we have mounted the root filesystem
[ -d "$NEWROOT/proc" ] && break;
# check if root can be mounted
[ -e /dev/root ] && break;
if [ $UDEVVERSION -ge 143 ]; then
udevadm settle --exit-if-exists=/initqueue/work --exit-if-exists=/dev/root
else
udevadm settle --timeout=30
fi
# bail out, if we have mounted the root filesystem
[ -d "$NEWROOT/proc" ] && break;
# check if root can be mounted
[ -e /dev/root ] && break;
unset queuetriggered
if [ -f /initqueue/work ]; then
rm /initqueue/work
queuetriggered="1"
fi
for job in /initqueue/*.sh; do
[ -e "$job" ] || break
job=$job . $job
# bail out, if we have mounted the root filesystem
[ -d "$NEWROOT/proc" ] && break;
# check if root can be mounted
[ -e /dev/root ] && break;
done
[ -n "$queuetriggered" ] && continue
if $UDEV_QUEUE_EMPTY >/dev/null 2>&1; then
# no more udev jobs
sleep 0.5
i=$(($i+1))
[ $i -gt 20 ] \
&& { flock -s 9 ; emergency_shell "No root device found"; } 9>/.console_lock
fi
done
unset job
unset queuetriggered
# pre-mount happens before we try to mount the root filesystem,
# and happens once.
getarg 'rdbreak=pre-mount' && emergency_shell "Break pre-mount"
source_all pre-mount
getarg 'rdbreak=mount' && emergency_shell "Break mount"
# mount scripts actually try to mount the root filesystem, and may
# be sourced any number of times. As soon as one suceeds, no more are sourced.
i=0
while :; do
[ -d "$NEWROOT/proc" ] && break;
for f in /mount/*.sh; do
[ -f "$f" ] && . "$f"
[ -d "$NEWROOT/proc" ] && break;
done
i=$(($i+1))
[ $i -gt 20 ] \
&& { flock -s 9 ; emergency_shell "Can't mount root filesystem"; } 9>/.console_lock
done
# pre pivot scripts are sourced just before we switch over to the new root.
getarg 'rdbreak=pre-pivot' && emergency_shell "Break pre-pivot"
source_all pre-pivot
# by the time we get here, the root filesystem should be mounted.
# Try to find init.
for i in "$(getarg init=)" /sbin/init /etc/init /init /bin/sh; do
[ -f "$NEWROOT$i" -a -x "$NEWROOT$i" ] && { INIT="$i"; break; }
done
[ "$INIT" ] || {
echo "Cannot find init!"
echo "Please check to make sure you passed a valid root filesystem!"
emergency_shell
}
getarg rdbreak && emergency_shell "Break before switch_root"
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
# Clean up the environment
for i in $(export -p); do
i=${i#declare -x}
i=${i#export}
i=${i%%=*}
[ "$i" = "root" -o "$i" = "PATH" -o "$i" = "HOME" -o "$i" = "TERM" ] || unset $i
done
initargs=""
initrdargs="$initrdargs console BOOT_IMAGE rdbreak rdinitdebug rdudevinfo rdudevdebug rdnetdebug rdcopystate rdshell"
for x in "$@"; do
for s in $initrdargs; do
[ "${x%%=*}" = $s ] && continue 2
done
initargs="$initargs $x"
done
# Copy state
mkdir /dev/.initramfs/
if getarg rdcopystate; then
cp /tmp/* /dev/.initramfs/ >/dev/null 2>&1
else
cp /tmp/net.* /dev/.initramfs/ >/dev/null 2>&1
fi
exec switch_root "$NEWROOT" "$INIT" $initargs || {
# davej doesn't like initrd bugs
echo "Something went very badly wrong in the initrd. Please "
echo "file a bug against mkinitrd."
emergency_shell
}