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#!/bin/bash
set -e
# do some sanity checks first
[ -e /run/initramfs/bin/sh ] && exit 0
[ -e /run/initramfs/.need_shutdown ] || exit 0
# SIGTERM signal is received upon forced shutdown: ignore the signal
# We want to remain alive to be able to trap unpacking errors to avoid
# switching root to an incompletely unpacked initramfs
trap 'echo "Received SIGTERM signal, ignoring!" >&2' TERM
KERNEL_VERSION="$(uname -r)"
[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
SKIP="$dracutbasedir/skipcpio"
[[ -x $SKIP ]] || SKIP="cat"
find_initrd_for_kernel_version() {
local kernel_version="$1"
local base_path files initrd machine_id
if [[ -d /efi/Default ]] || [[ -d /boot/Default ]] || [[ -d /boot/efi/Default ]]; then
machine_id="Default"
elif [[ -s /etc/machine-id ]]; then
read -r machine_id < /etc/machine-id
[[ $machine_id == "uninitialized" ]] && machine_id="Default"
else
machine_id="Default"
fi
if [ -n "$machine_id" ]; then
for base_path in /efi /boot /boot/efi; do
initrd="${base_path}/${machine_id}/${kernel_version}/initrd"
if [ -f "$initrd" ]; then
echo "$initrd"
return
fi
done
fi
if [[ -f /lib/modules/${kernel_version}/initrd ]]; then
echo "/lib/modules/${kernel_version}/initrd"
elif [[ -f /boot/initramfs-${kernel_version}.img ]]; then
echo "/boot/initramfs-${kernel_version}.img"
else
files=(/boot/initr*"${kernel_version}"*)
if [ "${#files[@]}" -ge 1 ] && [ -e "${files[0]}" ]; then
echo "${files[0]}"
fi
fi
}
mount -o ro /boot &> /dev/null || true
IMG=$(find_initrd_for_kernel_version "$KERNEL_VERSION")
if [ -z "$IMG" ]; then
if [[ -f /boot/initramfs-linux.img ]]; then
IMG="/boot/initramfs-linux.img"
else
echo "No initramfs image found to restore!"
exit 1
fi
fi
cd /run/initramfs
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) \
|| (command -v bzcat > /dev/null && $SKIP "$IMG" 2> /dev/null | bzcat 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1) \
|| (command -v xzcat > /dev/null && $SKIP "$IMG" 2> /dev/null | xzcat 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1) \
|| (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) \
|| (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) \
|| (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) \
|| ($SKIP "$IMG" 2> /dev/null | cpio -id --no-absolute-filenames --quiet > /dev/null 2>&1); then
rm -f -- .need_shutdown
else
# something failed, so we clean up
echo "Unpacking of $IMG to /run/initramfs failed" >&2
rm -f -- /run/initramfs/shutdown
exit 1
fi
if [[ -d squash ]]; then
if ! unsquashfs -no-xattrs -f -d . squash-root.img > /dev/null; then
echo "Squash module is enabled for this initramfs but failed to unpack squash-root.img" >&2
rm -f -- /run/initramfs/shutdown
exit 1
fi
fi
if grep -q -w selinux /sys/kernel/security/lsm 2> /dev/null \
&& [ -e /etc/selinux/config ] && [ -x /usr/sbin/setfiles ]; then
. /etc/selinux/config
if [[ $SELINUX != "disabled" && -n $SELINUXTYPE ]]; then
/usr/sbin/setfiles -v -r /run/initramfs /etc/selinux/"${SELINUXTYPE}"/contexts/files/file_contexts /run/initramfs > /dev/null
fi
fi
exit 0
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