Drop into debug shell when squashfs could not be mounted

ChangeLog

@@ -5,6 +5,10 @@
 # Distributed under the GPL v2
 # $Id$
 
+  16 Mar 2012; Sebastian Pipping <sping@gentoo.org> defaults/initrd.scripts,
+  defaults/linuxrc:
+  Drop into debug shell when squashfs could not be mounted
+
   16 Mar 2012; Sebastian Pipping <sping@gentoo.org> defaults/initrd.scripts,
   defaults/linuxrc:
   Drop into debug shell when files could not be copied into tmpfs

defaults/linuxrc

@@ -627,7 +627,14 @@ then
 		then
 			if [ "${USE_AUFS_NORMAL}" != '1' ]; then
 				good_msg 'Mounting squashfs filesystem'
-				mount -t squashfs -o loop,ro "${CDROOT_PATH}/${LOOPEXT}${LOOP}" "${NEW_ROOT}/mnt/livecd"
+				mount -t squashfs -o loop,ro "${CDROOT_PATH}/${LOOPEXT}${LOOP}" "${NEW_ROOT}/mnt/livecd" || {
+					bad_msg "Squashfs filesystem could not be mounted, dropping into shell."
+					if [ -e /proc/filesystems ]; then
+						fgrep -q squashfs /proc/filesystems || \
+							bad_msg "HINT: Your kernel does not know filesystem \"squashfs\"."
+					fi
+					do_rundebugshell
+				}
 			else
 				good_msg 'Mounting squashfs & aufs filesystems'
 				setup_squashfs_aufs