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97 lines
2.6 KiB
97 lines
2.6 KiB
#!/bin/sh |
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# |
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# Licensed under the GPLv2 |
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# |
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# Copyright 2008, Red Hat, Inc. |
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# Jeremy Katz <katzj@redhat.com> |
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emergency_shell() |
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{ |
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echo ; echo |
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echo "Bug in initramfs /init detected. Dropping to a shell. Good luck!" |
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echo |
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sh -i |
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} |
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getarg() { |
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local o line |
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for o in $CMDLINE; do |
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[ "$o" = "$1" ] && return 0 |
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[ "${o%%=*}" = "${1%=}" ] && { echo ${o#*=}; return 0; } |
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done |
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return 1 |
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} |
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source_all() { |
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local f |
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[ "$1" ] && [ -d "/$1" ] || return |
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for f in "/$1"/*.sh; do [ -f "$f" ] && . "$f"; done |
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} |
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echo "Starting initrd..." |
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export PATH=/sbin:/bin:/usr/sbin:/usr/bin |
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export TERM=linux |
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CONSOLE=/dev/console |
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[ -c $CONSOLE ] && exec >$CONSOLE 2>&1 <$CONSOLE |
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trap "emergency_shell" 0 |
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# mount some important things |
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mount -t proc /proc /proc |
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mount -t sysfs /sys /sys |
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mount -t tmpfs -omode=0755 udev /dev |
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read CMDLINE </proc/cmdline; |
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# Make some basic devices first, let udev handle the rest |
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mknod /dev/ptmx c 5 2 |
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mknod /dev/null c 1 3 |
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mknod /dev/console c 5 1 |
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mkdir /dev/pts |
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mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts |
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# pre-udev scripts run before udev starts, and are run only once. |
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getarg 'break=pre-udev' && emergency_shell |
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source_all pre-udev |
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# start up udev and trigger cold plugs |
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udevd --daemon |
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udevadm trigger >/dev/null 2>&1 |
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udevadm settle --timeout=30 >/dev/null 2>&1 |
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NEWROOT="/sysroot" |
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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 'break=pre-mount' && emergency_shell |
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source_all pre-mount |
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getarg 'break=mount' && emergency_shell |
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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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while :; do |
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for f in /mount/*.sh; do |
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[ -x "$f" ] && . "$f"; |
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[ "$ROOTFS_MOUNTED" ] && break; |
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done |
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[ "$ROOTFS_MOUNTED" ] && break; |
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sleep 1 |
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done |
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# by the time we get here, the root filesystem should be mounted. |
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# Try to find init. |
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for i in "$(getarg init=)" /sbin/init /etc/init /init /bin/sh; do |
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[ -f "$NEWROOT$i" -a -x "$NEWROOT$i" ] && { INIT="$i"; break; } |
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done |
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[ "$INIT" ] || { |
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echo "Cannot find init! Please check to make sure you passed" |
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echo "a valid root filesystem! Dropping to a shell." |
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emergency_shell |
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} |
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# pre pivot scripts are sourced just before we switch over to the new root. |
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getarg 'break=pre-pivot' && emergency_shell |
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source_all pre-pivot |
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getarg break && emergency_shell |
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echo "Switching to real root filesystem $root" |
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exec switch_root "$NEWROOT" "$INIT" $CMDLINE || { |
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# davej doesn't like initrd bugs |
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echo "Something went very badly wrong in the initrd. Please " |
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echo "file a bug against mkinitrd." |
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emergency_shell |
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}
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