#!/bin/sh
#
# Add ZoL filesystem capabilities to an initrd, usually for a native OpenZFS root.
#

# This hook installs udev rules for ZoL.
PREREQ="zdev"

# These prerequisites are provided by the zfsutils package. The zdb utility is
# not strictly required, but it can be useful at the initramfs recovery prompt.
COPY_EXEC_LIST="/sbin/zdb /sbin/zpool /sbin/zfs /sbin/mount.zfs"

# These prerequisites are provided by the base system.
COPY_EXEC_LIST="$COPY_EXEC_LIST /bin/hostname /sbin/blkid"

# Explicitly specify all kernel modules because automatic dependency resolution
# is unreliable on many systems.
MANUAL_ADD_MODULES_LIST="zlib_deflate spl zavl zcommon znvpair zunicode zfs"

# Generic result code.
RC=0

case $1 in
prereqs)
	echo "$PREREQ"
	exit 0
	;;
esac

for ii in $COPY_EXEC_LIST
do
	if [ ! -x "$ii" ]
	then
		echo "Error: $ii is not executable."
		RC=2
	fi
done

if [ "$RC" -ne 0 ]
then
	exit "$RC"
fi

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

mkdir -p "$DESTDIR/etc/"

# zpool requires /etc/mtab
ln -sf "/proc/mounts" "$DESTDIR/etc/mtab"

# ZDB uses pthreads for some functions, but the library dependency is not
# automatically detected. The `find` utility and extended `cp` options are
# used here because libgcc_s.so could be in a subdirectory of /lib for
# multi-arch installations.
cp --target-directory="$DESTDIR" --parents $(find /lib -type f -name libgcc_s.so.1)

for ii in $COPY_EXEC_LIST
do
	copy_exec "$ii"
done

for ii in $MANUAL_ADD_MODULES_LIST
do
	manual_add_modules "$ii"
done

if [ -f "/etc/hostname" ]
then
	cp -p "/etc/hostname" "$DESTDIR/etc/"
else
	hostname >"$DESTDIR/etc/hostname"
fi

# ZoL 0.6.3 deprecated the hostid check.
if [ -f /etc/hostid ]
then
	cp -p /etc/hostid "$DESTDIR/etc/hostid"
fi