create nexus7 rootfs as .ext4 instead of .img

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.102) UNRELEASED; urgency=low
+
+  * create the nexus7 rootfs image with .ext4 as suffix instead of using
+    .img, so debian-cd knows how to handle it
+
+ -- Oliver Grawert <ogra@ubuntu.com>  Tue, 20 Nov 2012 16:45:06 +0100
+
 livecd-rootfs (2.101) raring; urgency=low
 
   * instead of mangling the ac100 bootimg for nexus7 support, ship a proper

live-build/auto/build

@@ -384,9 +384,9 @@ if [ "$SUBARCH" = "ac100" ] || [ "$SUBARCH" = "nexus7" ]; then
 		# roll the android rootfs images
 		mkdir -p userdata
 		mv $PREFIX.rootfs.tar.gz userdata/rootfs.tar.gz
-		make_ext4fs -l 6G -s $PREFIX.img-$FLAVOUR userdata/
+		make_ext4fs -l 6G -s $PREFIX.ext4-$FLAVOUR userdata/
 		mv userdata/rootfs.tar.gz $PREFIX.rootfs.tar.gz
-		ln -sf "$PREFIX.img-$FLAVOUR" "$PREFIX.img"
+		ln -sf "$PREFIX.ext4-$FLAVOUR" "$PREFIX.ext4"
 	fi
 
 	# clean up