initrd/etc/rc

   1 #!/bin/sh
   2
   3 export PATH=/bin:/sbin
   4 export HOME=/var/home
   5
   6 # Where to mount the real root partition
   7 export NEW_ROOT=/new_root
   8
   9 rescue_shell() {
  10         echo "Starting the recovery shell ..."
  11         cat /etc/motd
  12         exec sh
  13         exit 0
  14 }
  15
  16 if [ ! -d "$NEW_ROOT" ]; then
  17         echo "WARNING: trying to remount / RW and create $NEW_ROOT ..."
  18         mount -u -w / &&
  19             mkdir $NEW_ROOT ||
  20             rescue_shell
  21 fi
  22
  23 echo "Setting up /var directories ..."
  24 mount_tmpfs tmpfs /var
  25 mkdir /var/db /var/empty /var/home /var/run /var/tmp
  26
  27 echo "Starting udevd for LVM ..."
  28 udevd
  29
  30 echo "Executing additional rc scripts ..."
  31 for rcs in /etc/rc.*; do
  32         if [ -x "$rcs" ]; then
  33                 . $rcs
  34         fi
  35 done
  36
  37 echo "Mounting real root partition at $NEW_ROOT ..."
  38
  39 IFS=':'
  40 REAL_ROOT=$(sysctl -n vfs.real_root)
  41 if [ $? -ne 0 ]; then
  42         echo "ERROR: vfs.real_root sysctl no exist. The kernel is too old."
  43         rescue_shell
  44 fi
  45 if [ -z "${REAL_ROOT}" ]; then
  46         echo "ERROR: vfs.real_root sysctl not set."
  47         rescue_shell
  48 fi
  49 set -- $REAL_ROOT
  50 unset IFS
  51
  52 TYPE=$1
  53 if [ "$TYPE" = "local" ]; then
  54         FSTYPE=$2
  55         MOUNTFROM="/dev/${3#/dev/}"
  56         echo "Executing: mount -t $FSTYPE $4 $MOUNTFROM $NEW_ROOT"
  57         mount -o ro -t $FSTYPE $4 $MOUNTFROM $NEW_ROOT ||
  58             rescue_shell
  59 elif [ -x "/etc/rcmount_${TYPE}" ]; then
  60         . /etc/rcmount_${TYPE} "$@" ||
  61             rescue_shell
  62 else
  63         echo "ERROR: Unsupported root filesystem type: $TYPE."
  64         rescue_shell
  65 fi
  66
  67 echo "Stopping udevd ..."
  68 kill $(cat /var/run/udevd.pid)
  69
  70 echo "Cleaning up and umounting /var ..."
  71 rm -rf /var/*
  72 umount /var
  73
  74 echo "Mounting devfs on real root ..."
  75 #mount_devfs $NEW_ROOT/dev
  76 mount_null /dev $NEW_ROOT/dev