Some minor fixes to the initramfs script.

* Apparently "var > 0" doesn't work. Use 'var -gt 0' instead. But that
  means that 'var' needs to be set, so set this to '0' if it's not already
  set at the beginning of the initrd script.
* Fixing return variable from a bunch of assist functions.
  Returned false when they should have returned true!
  Thanx to markdesouza @ GitHub for help findind this.
  Closes: #3869
* Make sure we set/reset IFS when retreiving sub-filesystems in
  recursive_mount_filesystems().
* Set and reset IFS in read_{mtab,fstab}().

contrib/initramfs/scripts/zfs

@@ -16,6 +16,10 @@ ZPOOL="/sbin/zpool"
 ZPOOL_CACHE="/etc/zfs/zpool.cache"
 export ZFS ZPOOL ZPOOL_CACHE
 
+# Needs to be set for rest of the code to work.
+[ -z "${ZFS_INITRD_PRE_MOUNTROOT_SLEEP}" ] && ZFS_INITRD_PRE_MOUNTROOT_SLEEP=0
+[ -z "${ZFS_INITRD_POST_MODPROBE_SLEEP}" ] && ZFS_INITRD_POST_MODPROBE_SLEEP=0
+
 # This runs any scripts that should run before we start importing
 # pools and mounting any filesystems.
 pre_mountroot()
@@ -44,7 +48,7 @@ pre_mountroot()
 # with more logging etc.
 load_module_initrd()
 {
-	if [ "$ZFS_INITRD_PRE_MOUNTROOT_SLEEP" > 0 ]
+	if [ "$ZFS_INITRD_PRE_MOUNTROOT_SLEEP" -gt 0 ]
 	then
 		check_boolean "$quiet" || \
 			zfs_log_begin_msg "Sleeping for" \
@@ -67,7 +71,7 @@ load_module_initrd()
 	# Load the module
 	load_module "zfs" || return 1
 
-	if [ "$ZFS_INITRD_POST_MODPROBE_SLEEP" > 0 ]
+	if [ "$ZFS_INITRD_POST_MODPROBE_SLEEP" -gt 0 ]
 	then
 		check_boolean "$quiet" || \
 			zfs_log_begin_msg "Sleeping for" \

contrib/shell-common/zfs-functions.in

@@ -405,7 +405,9 @@ recursive_mount_filesystems()
 
 	# Go through the complete list (recursivly) of all filesystems
 	# below the first (root) dataset.
+	zfs_set_ifs " "
 	filesystems="$("${ZFS}" list -oname -tfilesystem -H -r "${fs}")"
+	zfs_set_ifs "${OLD_IFS}"
 	for f in ${filesystems} ${ZFS_INITRD_ADDITIONAL_DATASETS}
 	do
 		# Ignore the first (root) fs. Should already be
@@ -428,6 +430,8 @@ read_mtab()
 	local match="$1"
 	local fs mntpnt fstype opts rest TMPFILE
 
+	zfs_set_ifs "${OLD_IFS}"
+
 	# Unset all MTAB_* variables
 	unset $(env | grep ^MTAB_ | sed 's,=.*,,')
 
@@ -449,9 +453,11 @@ read_mtab()
 			fs=$(printf '%b\n' "$fs")
 
 			# Set the variable.
-			eval export MTAB_$mntpnt=\"$fs\"
+			eval export MTAB_$mntpnt="\"$fs\""
 		fi
 	done < /proc/mounts
+
+	zfs_set_ifs "${TMP_IFS}"
 }
 
 # Check if specified filesystem is mounted.
@@ -472,7 +478,9 @@ in_mtab()
 read_fstab()
 {
 	local match="$1"
-	local i var TMPFILE
+	local i var TMPFILE fs mntpnt fstype opts
+
+	zfs_set_ifs "${OLD_IFS}"
 
 	# Unset all FSTAB_* variables
 	unset $(env | grep ^FSTAB_ | sed 's,=.*,,')
@@ -482,13 +490,15 @@ read_fstab()
 		echo "$fs" | egrep -qE '^#|^$' && continue
 
 		if echo "$fs $mntpnt $fstype $opts" | grep -qE "$match"; then
-			eval export FSTAB_dev_$i="$fs"
+			eval export FSTAB_dev_$i="\"$fs\""
 			fs=$(printf '%b\n' "$fs" | sed 's,/,_,g')
-			eval export FSTAB_$i="$mntpnt"
+			eval export FSTAB_$i="\"$mntpnt\""
 
 			i=$((i + 1))
 		fi
 	done < /etc/fstab
+
+	zfs_set_ifs "${TMP_IFS}"
 }
 
 # Check to see if specified filesystem is in fstab
@@ -716,8 +726,6 @@ import_pool()
 			else
 				return 1
 			fi
-		else
-			return 1
 		fi
 	fi
 
@@ -801,8 +809,6 @@ mount_fs()
 		else
 			return 1
 		fi
-	else
-		return 1
 	fi
 
 	return 0
@@ -844,8 +850,6 @@ decrypt_fs()
 			else
 				return 1
 			fi
-		else
-			return 1
 		fi
 	done
 
@@ -868,8 +872,6 @@ decrypt_fs()
 		else
 			return 1
 		fi
-	else
-		return 1
 	fi
 
 	return 0
@@ -897,8 +899,6 @@ destroy_fs()
 		else
 			return 1
 		fi
-	else
-		return 1
 	fi
 
 	return 0
@@ -939,8 +939,6 @@ clone_snap()
 		else
 			return 1
 		fi
-	else
-		return 1
 	fi
 
 	return 0
@@ -966,8 +964,6 @@ rollback_snap()
 		else
 			return 1
 		fi
-	else
-		return 1
 	fi
 
 	return 0