modules.d/99base/init

   1 #!/bin/sh
   2 #
   3 # Licensed under the GPLv2
   4 #
   5 # Copyright 2008, Red Hat, Inc.
   6 # Jeremy Katz <katzj@redhat.com>
   7
   8 emergency_shell()
   9 {
  10     source_all emergency
  11     echo ; echo
  12     echo "Bug in initramfs /init detected. Dropping to a shell. Good luck!"
  13     echo
  14     sh -i
  15 }
  16
  17 export PATH=/sbin:/bin:/usr/sbin:/usr/bin
  18 export TERM=linux
  19 NEWROOT="/sysroot"
  20
  21 trap "emergency_shell" 0
  22
  23 . /lib/dracut-lib
  24
  25 mknod /dev/null c 1 3
  26
  27 # mount some important things
  28 mount -t proc /proc /proc >/dev/null 2>&1
  29 mount -t sysfs /sys /sys >/dev/null 2>&1
  30 mount -t tmpfs -omode=0755 udev /dev >/dev/null 2>&1
  31
  32 getarg rdinitdebug && set -x
  33 # Make some basic devices first, let udev handle the rest
  34 mknod /dev/null c 1 3
  35 mknod /dev/ptmx c 5 2
  36 mknod /dev/console c 5 1
  37 mkdir /dev/pts
  38 mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts >/dev/null 2>&1
  39
  40 # run scriptlets to parse the command line
  41 getarg 'rdbreak=cmdline' && emergency_shell
  42 source_all cmdline
  43
  44 if [ -z "$rootok" -a -n "${root%%error:*}" ]; then
  45     root="error: No handler for root=${root}"
  46 fi
  47
  48 if [ -z "${root%%error:*}" ]; then
  49     case "${root%%:*}" in
  50        '') echo "FATAL: no root= option specified, and no network support" ;;
  51        error) echo "FATAL: ${root#error:}" ;;
  52     esac
  53     emergency_shell
  54 fi
  55
  56 # Network root scripts may need updated root= options,
  57 # so deposit them where they can see them (udev purges the env)
  58 {
  59     echo "root='$root'"
  60     echo "rflags='$rflags'"
  61     echo "fstype='$fstype'"
  62     echo "NEWROOT='$NEWROOT'"
  63 } > /tmp/root.info
  64
  65 # pre-udev scripts run before udev starts, and are run only once.
  66 getarg 'rdbreak=pre-udev' && emergency_shell
  67 source_all pre-udev
  68
  69 # start up udev and trigger cold plugs
  70 udevd --daemon
  71 getarg rdudevinfo && udevadm control --log_priority=info
  72 getarg rdudevdebug && udevadm control --log_priority=debug
  73
  74 source_all pre-trigger
  75
  76 # then the rest
  77 [ -f /tmp/udevtriggeropts ] && udevtriggeropts=$(while read line; do echo $line;done < /tmp/udevtriggeropts)
  78 udevadm trigger $udevtriggeropts  >/dev/null 2>&1
  79 udevadm settle --timeout=30 >/dev/null 2>&1
  80
  81 # pre-mount happens before we try to mount the root filesystem,
  82 # and happens once.
  83 getarg 'rdbreak=pre-mount' && emergency_shell
  84 source_all pre-mount
  85 getarg 'rdbreak=mount' && emergency_shell
  86
  87 # mount scripts actually try to mount the root filesystem, and may
  88 # be sourced any number of times. As soon as one suceeds, no more are sourced.
  89 i=0
  90 while :; do
  91     [ -d "$NEWROOT/proc" ] && break;
  92
  93     for f in /mount/*.sh; do
  94        [ -x "$f" ] && . "$f";
  95        [ "$ROOTFS_MOUNTED" ] && break;
  96     done
  97
  98     sleep 0.5
  99     i=$(($i+1))
 100     { flock -s 9 ; [ $i -gt 20 ] && emergency_shell; } 9>/.console_lock
 101 done
 102
 103 # pre pivot scripts are sourced just before we switch over to the new root.
 104 getarg 'rdbreak=pre-pivot' && emergency_shell
 105 source_all pre-pivot
 106
 107 # by the time we get here, the root filesystem should be mounted.
 108 # Try to find init.
 109 for i in "$(getarg init=)" /sbin/init /etc/init /init /bin/sh; do
 110     [ -f "$NEWROOT$i" -a -x "$NEWROOT$i" ] && { INIT="$i"; break; }
 111 done
 112 [ "$INIT" ] || {
 113     echo "Cannot find init! Please check to make sure you passed"
 114     echo "a valid root filesystem!  Dropping to a shell."
 115     emergency_shell
 116 }
 117
 118 getarg rdbreak && emergency_shell
 119 kill $(pidof udevd)
 120
 121 # Clean up the environment
 122 for i in $(export -p); do
 123     i=${i#declare -x}
 124     i=${i#export}
 125     i=${i%%=*}
 126     [ "$i" = "root" -o "$i" = "PATH" -o "$i" = "HOME" -o "$i" = "TERM" ] || unset $i
 127 done
 128
 129 initargs=""
 130 for x in "$@"; do
 131     [ "${x%%=*}" = "console" ] && continue
 132     [ "${x%%=*}" = "BOOT_IMAGE" ] && continue
 133     [ "${x%%=*}" = "rdbreak" ] && continue
 134     [ "${x%%=*}" = "rdinitdebug" ] && continue
 135     [ "${x%%=*}" = "rdudevinfo" ] && continue
 136     [ "${x%%=*}" = "rdudevdebug" ] && continue
 137     initargs="$initargs $x"
 138 done
 139 exec switch_root "$NEWROOT" "$INIT" $initargs || {
 140     # davej doesn't like initrd bugs
 141     echo "Something went very badly wrong in the initrd.  Please "
 142     echo "file a bug against mkinitrd."
 143     emergency_shell
 144 }