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 || true
  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 elif $SKIP "$IMG" | zstd -d -c | cpio -id --no-absolute-filenames --quiet >/dev/null; then
  35     rm -f -- .need_shutdown
  36 else
  37     # something failed, so we clean up
  38     echo "Unpacking of $IMG to /run/initramfs failed" >&2
  39     rm -f -- /run/initramfs/shutdown
  40     exit 1
  41 fi
  42
  43 if [[ -d squash ]]; then
  44     unsquashfs -no-xattrs -f -d . squash/root.img >/dev/null
  45     if [ $? -ne 0 ]; then
  46         echo "Squash module is enabled for this initramfs but failed to unpack squash/root.img" >&2
  47         rm -f -- /run/initramfs/shutdown
  48         exit 1
  49     fi
  50 fi
  51
  52 if [ -e /etc/selinux/config -a -x /usr/sbin/setfiles ] ; then
  53     . /etc/selinux/config
  54     /usr/sbin/setfiles -v -r /run/initramfs /etc/selinux/${SELINUXTYPE}/contexts/files/file_contexts /run/initramfs > /dev/null
  55 fi
  56
  57 exit 0