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#!/bin/sh

PREREQ=""

prereqs()
{
	echo "$PREREQ"
}

# Find a specific fstab entry
# $1=mountpoint
# $2=fstype (optional)
_read_fstab_entry () {
	# Not found by default.
	echo "MNT_FSNAME="
	echo "MNT_DIR="
	echo "MNT_TYPE="

	for file in /etc/fstab /etc/fstab.d/*.fstab; do
		if [ -f "$file" ]; then
			# shellcheck disable=SC2034
			while read -r MNT_FSNAME MNT_DIR MNT_TYPE MNT_OPTS MNT_FREQ MNT_PASS MNT_JUNK; do
				case "$MNT_FSNAME" in
				  ""|\#*)
					continue;
					;;
				esac
				if [ "$MNT_DIR" = "$1" ]; then
					if [ -n "$2" ]; then
						[ "$MNT_TYPE" = "$2" ] || continue;
					fi
					echo "MNT_FSNAME=$MNT_FSNAME"
					echo "MNT_DIR=$MNT_DIR"
					echo "MNT_TYPE=$MNT_TYPE"
					echo "MNT_PASS=$MNT_PASS"
					break 2
				fi
				MNT_DIR=""
			done < "$file"
		fi
	done
}

# Find a specific fstab entry and print its type (if found, and pass != 0)
# $1=mountpoint
get_fsck_type_fstab () {
	eval "$(_read_fstab_entry "$1")"

	# Not found by default.
	if [ "$1" = "$MNT_DIR" ]; then
		# Ignore filesystem type for /, as it is not available and
		# therefore never used at boot time
		if [ "${MNT_DIR}" = "/" ] || [ "${MNT_TYPE}" = "auto" ]; then
			MNT_FSNAME="$(resolve_device "${MNT_FSNAME}")"
			# shellcheck disable=SC2317
			fstype() { "/usr/lib/klibc/bin/fstype" "$@"; }
			if ! get_fstype "${MNT_FSNAME}"; then
				echo "W: Couldn't identify type of $2 file system for fsck hook" >&2
			fi
			unset -f fstype
		else
			echo "${MNT_TYPE}"
		fi
	fi
}

get_fsck_types() {
	if [ "${FSTYPE:-auto}" = auto ]; then
		get_fsck_type_fstab /    root
		get_fsck_type_fstab /usr usr
	else
		local IFS=,
		local fstype
		set -f
		for fstype in $FSTYPE; do
			echo "$fstype"
		done
		set +f
	fi
}

case $1 in
prereqs)
	prereqs
	exit 0
	;;
esac

if [ ! -x /sbin/fsck ]; then
	exit 0
fi

. /usr/share/initramfs-tools/scripts/functions
. /usr/share/initramfs-tools/hook-functions

fsck_types="$(get_fsck_types | sort | uniq)"

if [ -z "$fsck_types" ]; then
	exit 0
fi

copy_exec /sbin/fsck
copy_exec /sbin/logsave

for type in $fsck_types; do
	if prog="$(command -v "fsck.${type}")"; then
		copy_exec "$prog"
	else
		echo "W: /sbin/fsck.${type} doesn't exist, can't install to initramfs" >&2
	fi
done