contrib: dracut: zfs-lib: remove find_bootfs

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13291

contrib/dracut/90zfs/mount-zfs.sh.in

@@ -28,10 +28,10 @@ ZFS_DATASET=
 ZFS_POOL=
 
 if [ "${root}" = "zfs:AUTO" ] ; then
-	if ! ZFS_DATASET="$(find_bootfs)" ; then
+	if ! ZFS_DATASET="$(zpool get -Ho value bootfs | grep -m1 -vFx -)"; then
 		# shellcheck disable=SC2086
 		zpool import -N -a ${ZPOOL_IMPORT_OPTS}
-		if ! ZFS_DATASET="$(find_bootfs)" ; then
+		if ! ZFS_DATASET="$(zpool get -Ho value bootfs | grep -m1 -vFx -)"; then
 			warn "ZFS: No bootfs attribute found in importable pools."
 			zpool export -aF
 

contrib/dracut/90zfs/zfs-lib.sh.in

@@ -27,31 +27,6 @@ if getargbool 0 zfs_force -y zfs.force -y zfsforce ; then
     ZPOOL_IMPORT_OPTS="${ZPOOL_IMPORT_OPTS} -f"
 fi
 
-# find_bootfs
-#   returns the first dataset with the bootfs attribute.
-find_bootfs() {
-    IFS="${NEWLINE}"
-    for dataset in $(zpool list -H -o bootfs); do
-        case "${dataset}" in
-            "" | "-")
-                continue
-                ;;
-            "no pools available")
-                IFS="${OLDIFS}"
-                return 1
-                ;;
-            *)
-                IFS="${OLDIFS}"
-                echo "${dataset}"
-                return 0
-                ;;
-        esac
-    done
-
-    IFS="${OLDIFS}"
-    return 1
-}
-
 # import_pool POOL
 #   imports the given zfs pool if it isn't imported already.
 import_pool() {