dracut-initramfs-restore.sh

   1 #!/bin/bash
   2
   3 set -e
   4
   5 # do some sanity checks first
   6 [ -e /run/initramfs/bin/sh ] && exit 0
   7 [ -e /run/initramfs/.need_shutdown ] || exit 0
   8
   9 KERNEL_VERSION="$(uname -r)"
  10
  11 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
  12 SKIP="$dracutbasedir/skipcpio"
  13 [[ -x $SKIP ]] || SKIP=cat
  14
  15 [[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
  16
  17 mount -o ro /boot &>/dev/null
  18
  19 if [[ $MACHINE_ID ]] && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]] ; then
  20     IMG="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
  21 fi
  22 [[ -f $IMG ]] || IMG="/boot/initramfs-${KERNEL_VERSION}.img"
  23
  24 cd /run/initramfs
  25
  26 [ -f .need_shutdown -a -f "$IMG" ] || exit 1
  27
  28 if $SKIP "$IMG" | zcat | cpio -id --no-absolute-filenames --quiet >/dev/null; then
  29     rm -f -- .need_shutdown
  30 elif $SKIP "$IMG" | xzcat | cpio -id --no-absolute-filenames --quiet >/dev/null; then
  31     rm -f -- .need_shutdown
  32 elif $SKIP "$IMG" | lz4 -d -c | cpio -id --no-absolute-filenames --quiet >/dev/null; then
  33     rm -f -- .need_shutdown
  34 else
  35     # something failed, so we clean up
  36     echo "Unpacking of $IMG to /run/initramfs failed" >&2
  37     rm -f -- /run/initramfs/shutdown
  38     exit 1
  39 fi
  40
  41 exit 0