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

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

# 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="@sbindir@/zdb @sbindir@/zpool @sbindir@/zfs"
COPY_EXEC_LIST="$COPY_EXEC_LIST @mounthelperdir@/mount.zfs @udevdir@/vdev_id"
COPY_EXEC_LIST="$COPY_EXEC_LIST @udevdir@/zvol_id"
COPY_FILE_LIST="/etc/hostid @sysconfdir@/zfs/zpool.cache"
COPY_FILE_LIST="$COPY_FILE_LIST @initconfdir@/zfs"
COPY_FILE_LIST="$COPY_FILE_LIST @sysconfdir@/zfs/zfs-functions"
COPY_FILE_LIST="$COPY_FILE_LIST @sysconfdir@/zfs/vdev_id.conf"
COPY_FILE_LIST="$COPY_FILE_LIST @udevruledir@/60-zvol.rules"
COPY_FILE_LIST="$COPY_FILE_LIST @udevruledir@/69-vdev.rules"

# These prerequisites are provided by the base system.
COPY_EXEC_LIST="$COPY_EXEC_LIST /usr/bin/dirname /bin/hostname /sbin/blkid"
COPY_EXEC_LIST="$COPY_EXEC_LIST /usr/bin/env"
COPY_EXEC_LIST="$COPY_EXEC_LIST $(which systemd-ask-password)"

# Explicitly specify all kernel modules because automatic dependency resolution
# is unreliable on many systems.
BASE_MODULES="zlib_deflate spl zavl zcommon znvpair zunicode zlua zfs icp"
CRPT_MODULES="sun-ccm sun-gcm sun-ctr"
MANUAL_ADD_MODULES_LIST="$BASE_MODULES"

# 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/"

# 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 $COPY_FILE_LIST
do
	dir=$(dirname "$ii")
	[ -d "$dir" ] && mkdir -p "$DESTDIR/$dir"
	[ -f "$ii" ] && cp -p "$ii" "$DESTDIR/$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

for ii in zfs zfs.conf spl spl.conf
do
	if [ -f "/etc/modprobe.d/$ii" ]; then
		if [ ! -d "$DESTDIR/etc/modprobe.d" ]; then
			mkdir -p $DESTDIR/etc/modprobe.d
		fi
		cp -p "/etc/modprobe.d/$ii" $DESTDIR/etc/modprobe.d/
	fi
done

# With pull request #1476 (not yet merged) comes a verbose warning
# if /usr/bin/net doesn't exist or isn't executable. Just create
# a dummy...
[ ! -d "$DESTDIR/usr/bin" ] && mkdir -p "$DESTDIR/usr/bin"
if [ ! -x "$DESTDIR/usr/bin/net" ]; then
    touch "$DESTDIR/usr/bin/net"
    chmod +x "$DESTDIR/usr/bin/net"
fi

exit 0