[OpenWrt-Devel] [PATCH 2/2] x86: image: Remove TARGET_IMAGES_PAD option and force padding

Petr Štetiar ynezz at true.cz
Wed Mar 27 11:08:56 EDT 2019

Currently we're producing unusable x86 combined squashfs images
(18.06.1, 18.06.2 and snapshots) as we don't enable TARGET_IMAGES_PAD,
thus providing very small space for the overlay filesystem, leading to
the following with OpenWrt 18.06.1 r7258-5eb055306f images on x86 QEMU:

 root@(none):/# mount | egrep 'root|overlay'
  /dev/root on /rom type squashfs
  /dev/loop0 on /overlay type ext4
  overlayfs:/overlay on / type overlay

 root@(none):/# df -h | egrep 'root|overlay|Size'
  Filesystem                Size      Used Available Use% Mounted on
  /dev/root                 2.5M      2.5M         0 100% /rom
  /dev/loop0              113.0K      8.0K     97.0K   8% /overlay
  overlayfs:/overlay      113.0K      8.0K     97.0K   8% /

We should rather ensure proper image padding in image generation code
and we shouldn't rely on config options in order to generate usable

So this patch removes TARGET_IMAGES_PAD config option and enforces
padding on combined images.

Signed-off-by: Petr Štetiar <ynezz at true.cz>
 target/linux/x86/image/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/x86/image/Makefile b/target/linux/x86/image/Makefile
index 84a3d88..2d04d12 100644
--- a/target/linux/x86/image/Makefile
+++ b/target/linux/x86/image/Makefile
@@ -80,7 +80,7 @@ ifneq ($(CONFIG_GRUB_IMAGES),)
 		-e 's#@TITLE@#$(GRUB_TITLE)#g' \
 		./grub.cfg > $(KDIR)/root.grub/boot/grub/grub.cfg
 	-$(CP) $(STAGING_DIR_ROOT)/boot/. $(KDIR)/root.grub/boot/
+	PADDING="1" SIGNATURE="$(SIGNATURE)" PATH="$(TARGET_PATH)" $(SCRIPT_DIR)/gen_image_generic.sh \
 		$(BIN_DIR)/$(IMG_PREFIX)-combined-$(1).img \

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