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 # SIGTERM signal is received upon forced shutdown: ignore the signal
  10 # We want to remain alive to be able to trap unpacking errors to avoid
  11 # switching root to an incompletely unpacked initramfs
  12 trap 'echo "Received SIGTERM signal, ignoring!" >&2' TERM
  13
  14 KERNEL_VERSION="$(uname -r)"
  15
  16 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
  17 SKIP="$dracutbasedir/skipcpio"
  18 [[ -x $SKIP ]] || SKIP="cat"
  19
  20 if [[ -d /efi/Default ]] || [[ -d /boot/Default ]] || [[ -d /boot/efi/Default ]]; then
  21     MACHINE_ID="Default"
  22 elif [[ -f /etc/machine-id ]]; then
  23     read -r MACHINE_ID < /etc/machine-id
  24 else
  25     MACHINE_ID="Default"
  26 fi
  27
  28 mount -o ro /boot &> /dev/null || true
  29
  30 if [[ -d /efi/loader/entries ]] || [[ -L /efi/loader/entries ]] \
  31     || [[ -d /efi/$MACHINE_ID ]] || [[ -L /efi/$MACHINE_ID ]]; then
  32     IMG="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
  33 elif [[ -d /boot/loader/entries ]] || [[ -L /boot/loader/entries ]] \
  34     || [[ -d /boot/$MACHINE_ID ]] || [[ -L /boot/$MACHINE_ID ]]; then
  35     IMG="/boot/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
  36 elif [[ -d /boot/efi/loader/entries ]] || [[ -L /boot/efi/loader/entries ]] \
  37     || [[ -d /boot/efi/$MACHINE_ID ]] || [[ -L /boot/efi/$MACHINE_ID ]]; then
  38     IMG="/boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd"
  39 elif [[ -f /lib/modules/${KERNEL_VERSION}/initrd ]]; then
  40     IMG="/lib/modules/${KERNEL_VERSION}/initrd"
  41 elif [[ -f /boot/initramfs-${KERNEL_VERSION}.img ]]; then
  42     IMG="/boot/initramfs-${KERNEL_VERSION}.img"
  43 elif mountpoint -q /efi; then
  44     IMG="/efi/$MACHINE_ID/$KERNEL_VERSION/initrd"
  45 elif mountpoint -q /boot/efi; then
  46     IMG="/boot/efi/$MACHINE_ID/$KERNEL_VERSION/initrd"
  47 else
  48     echo "No initramfs image found to restore!"
  49     exit 1
  50 fi
  51
  52 cd /run/initramfs
  53
  54 if (command -v zcat > /dev/null && $SKIP "$IMG" 2> /dev/null | zcat 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1) \
  55     || (command -v bzcat > /dev/null && $SKIP "$IMG" 2> /dev/null | bzcat 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1) \
  56     || (command -v xzcat > /dev/null && $SKIP "$IMG" 2> /dev/null | xzcat 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1) \
  57     || (command -v lz4 > /dev/null && $SKIP "$IMG" 2> /dev/null | lz4 -d -c 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1) \
  58     || (command -v lzop > /dev/null && $SKIP "$IMG" 2> /dev/null | lzop -d -c 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1) \
  59     || (command -v zstd > /dev/null && $SKIP "$IMG" 2> /dev/null | zstd -d -c 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1) \
  60     || ($SKIP "$IMG" 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1); then
  61     rm -f -- .need_shutdown
  62 else
  63     # something failed, so we clean up
  64     echo "Unpacking of $IMG to /run/initramfs failed" >&2
  65     rm -f -- /run/initramfs/shutdown
  66     exit 1
  67 fi
  68
  69 if [[ -d squash ]]; then
  70     if ! unsquashfs -no-xattrs -f -d . squash-root.img > /dev/null; then
  71         echo "Squash module is enabled for this initramfs but failed to unpack squash-root.img" >&2
  72         rm -f -- /run/initramfs/shutdown
  73         exit 1
  74     fi
  75 fi
  76
  77 if [ -e /etc/selinux/config -a -x /usr/sbin/setfiles ]; then
  78     . /etc/selinux/config
  79     [ -n "${SELINUXTYPE}" ] && /usr/sbin/setfiles -v -r /run/initramfs /etc/selinux/"${SELINUXTYPE}"/contexts/files/file_contexts /run/initramfs > /dev/null
  80 fi
  81
  82 exit 0