imagebuilder: allow to specific ROOTFS_PARTSIZE

Setting this options modifies the rootfs size of created images. When
installing a large number of packages it may become necessary to
increase the size to have enough storage.

This option is only useful for supported devices, i.e. with an attached
SD Card or installed on a hard drive.
Signed-off-by: NPaul Spooren <mail@aparcar.org>
(cherry picked from commit 7b7edd25)

target/imagebuilder/files/Makefile

@@ -47,6 +47,7 @@ Building images:
 	make image EXTRA_IMAGE_NAME="<string>" # Add this to the output image filename (sanitized)
 	make image DISABLED_SERVICES="<svc1> [<svc2> [<svc3> ..]]" # Which services in /etc/init.d/ should be disabled
 	make image ADD_LOCAL_KEY=1 # store locally generated signing key in built images
+	make image ROOTFS_PARTSIZE="<size>" # override the default rootfs partition size in MegaBytes
 
 Print manifest:
 	List "all" packages which get installed into the image.
@@ -243,7 +244,8 @@ image:
 		$(if $(FILES),USER_FILES="$(FILES)") \
 		$(if $(PACKAGES),USER_PACKAGES="$(PACKAGES)") \
 		$(if $(BIN_DIR),BIN_DIR="$(BIN_DIR)") \
-		$(if $(DISABLED_SERVICES),DISABLED_SERVICES="$(DISABLED_SERVICES)"))
+		$(if $(DISABLED_SERVICES),DISABLED_SERVICES="$(DISABLED_SERVICES)") \
+		$(if $(ROOTFS_PARTSIZE),CONFIG_TARGET_ROOTFS_PARTSIZE="$(ROOTFS_PARTSIZE)"))
 
 manifest: FORCE
 	$(MAKE) -s _check_profile