Improve handling of missing /etc/fstab

ChangeLog

@@ -5,6 +5,10 @@
 # Distributed under the GPL v2
 # $Id$
 
+  16 Mar 2012; Sebastian Pipping <sping@gentoo.org> defaults/initrd.scripts,
+  defaults/linuxrc:
+  Improve handling of missing /etc/fstab
+
   16 Mar 2012; Sebastian Pipping <sping@gentoo.org> defaults/initrd.scripts:
   No longer use parameter "-r" (for regex intervals) that busybox awk does not
   support

defaults/initrd.scripts

@@ -1205,6 +1205,7 @@ get_mounts_list()
 
 get_mount_fstype()
 {
+	[ -e "${NEW_ROOT}"/etc/fstab ] || return 1
 	awk -v fs="$1" '
 		/^[[:blank:]]*#/ { next }
 		$2 == fs { print $3 }
@@ -1213,6 +1214,7 @@ get_mount_fstype()
 
 get_mount_options()
 {
+	[ -e "${NEW_ROOT}"/etc/fstab ] || return 1
 	awk -v fs="$1" '
 		/^[[:blank:]]*#/ { next }
 		$2 == fs { print $4 }
@@ -1221,6 +1223,7 @@ get_mount_options()
 
 get_mount_device()
 {
+	[ -e "${NEW_ROOT}"/etc/fstab ] || return 1
 	awk -v fs="$1" '
 		/^[[:blank:]]*#/ { next }
 		$2 == fs { print $1 }

defaults/linuxrc

@@ -776,6 +776,7 @@ fi
 
 for fs in $fslist; do
 	dev=$(get_mount_device $fs)
+	[ -z "${dev}" ] && continue
 	# Resolve it like util-linux mount does
 	[ -L ${dev} ] && dev=`readlink ${dev}`
 	# In this case, it's probably part of the filesystem