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 -r MACHINE_ID < /etc/machine-id
  16
  17 mount -o ro /boot &> /dev/null || true
  18
  19 if [[ -d /efi/loader/entries || -L /efi/loader/entries ]] \
  20     && [[ $MACHINE_ID ]] \
  21     && [[ -d /efi/${MACHINE_ID} || -L /efi/${MACHINE_ID} ]]; then
  22     IMG="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
  23 elif [[ -d /boot/loader/entries || -L /boot/loader/entries ]] \
  24     && [[ $MACHINE_ID ]] \
  25     && [[ -d /boot/${MACHINE_ID} || -L /boot/${MACHINE_ID} ]]; then
  26     IMG="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
  27 else
  28     IMG="/boot/initramfs-${KERNEL_VERSION}.img"
  29 fi
  30
  31 cd /run/initramfs
  32
  33 [ -f .need_shutdown -a -f "$IMG" ] || exit 1
  34
  35 if $SKIP "$IMG" | zcat | cpio -id --no-absolute-filenames --quiet > /dev/null; then
  36     rm -f -- .need_shutdown
  37 elif $SKIP "$IMG" | xzcat | cpio -id --no-absolute-filenames --quiet > /dev/null; then
  38     rm -f -- .need_shutdown
  39 elif $SKIP "$IMG" | lz4 -d -c | cpio -id --no-absolute-filenames --quiet > /dev/null; then
  40     rm -f -- .need_shutdown
  41 elif $SKIP "$IMG" | zstd -d -c | cpio -id --no-absolute-filenames --quiet > /dev/null; then
  42     rm -f -- .need_shutdown
  43 else
  44     # something failed, so we clean up
  45     echo "Unpacking of $IMG to /run/initramfs failed" >&2
  46     rm -f -- /run/initramfs/shutdown
  47     exit 1
  48 fi
  49
  50 if [[ -d squash ]]; then
  51     if ! unsquashfs -no-xattrs -f -d . squash-root.img > /dev/null; then
  52         echo "Squash module is enabled for this initramfs but failed to unpack squash-root.img" >&2
  53         rm -f -- /run/initramfs/shutdown
  54         exit 1
  55     fi
  56 fi
  57
  58 if [ -e /etc/selinux/config -a -x /usr/sbin/setfiles ]; then
  59     . /etc/selinux/config
  60     /usr/sbin/setfiles -v -r /run/initramfs /etc/selinux/"${SELINUXTYPE}"/contexts/files/file_contexts /run/initramfs > /dev/null
  61 fi
  62
  63 exit 0