config/chroot_local-includes/usr/share/initramfs-tools/scripts/init-bottom/early_patch

   1 #!/bin/sh
   2
   3 # Enable xtrace with timestamp
   4 export PS4='$(date "+%H:%M:%S.%3N") '
   5 set -x
   6
   7 PREREQS=""
   8
   9 prereqs() { echo "$PREREQS"; }
  10
  11 case "$1" in
  12         prereqs)
  13         prereqs
  14         exit 0
  15         ;;
  16 esac
  17
  18 set -eu
  19
  20 option="$(tr ' ' '\n' < /proc/cmdline | grep '^early_patch\b')"
  21
  22 [ -n "$option" ] || exit 0
  23
  24 . /scripts/functions
  25
  26 MOUNTPOINT=/root/mnt
  27
  28 run() {
  29   for mod in fscache 9pnet 9pnet_virtio 9p; do
  30     modprobe -vvv -d /root/ $mod
  31   done
  32
  33   mkdir -p "$MOUNTPOINT"
  34   mount -t 9p src "$MOUNTPOINT"
  35   "${MOUNTPOINT}/hook" /root
  36
  37   # early_patch=umount will umount the filesystem immediately after running the hook
  38   # this is needed to have early_patch in the test suite.
  39   # In fact, qemu cannot do snapshots while this is mounted
  40   if echo "$option" | grep -qw umount; then
  41       umount "$MOUNTPOINT"
  42   fi
  43 }
  44
  45 spawn_shell() {
  46   # Make plymouth write the log to /root/var/log/boot.log
  47   /bin/plymouth update-root-fs --new-root-dir=/root --read-write
  48   # Stop plymouth, so that the user can see the shell
  49   /bin/plymouth quit || true
  50
  51   # Disable xtrace to make the following output more readable
  52   set +x
  53   echo -e >&2 "\nThe early_patch hook failed. Spawning a shell to allow debugging..."
  54   echo >&2 "The log is in /root/var/log/boot.log"
  55   echo >&2 "Press Ctrl-D to continue booting."
  56
  57   # Call panic from /usr/share/initramfs-tools/scripts/functions to
  58   # spawn a shell. Note that panic does not work if set -e is active.
  59   . /scripts/functions
  60   panic
  61 }
  62
  63 # This is necessary to have `set -e` work in the `run` function, see
  64 # https://stackoverflow.com/a/11092989/2804197
  65 set +e
  66 (set -e; run); ret=$?
  67
  68 if [ "$ret" -ne 0 ]; then
  69   spawn_shell
  70 fi