[OpenWrt-Devel] [PATCH 1/2] build: image: add common and reproducible IMG_PART_SIGNATURE variable

[Petr Štetiar]

From: Paul Spooren <mail at aparcar.org>

x86, mvebu and tegra targets are currently using more or less same
SIGNATURE variable which provides unique partition ID/signature, so it
makes sense to refactor it out into common variable which could be
reused by all targets.  While at it, make the content of the variable
reproducible.

Ref: http://lists.infradead.org/pipermail/openwrt-devel/2019-March/016148.html
Signed-off-by: Paul Spooren <mail at aparcar.org>
Suggested-by: Jo-Philipp Wich <jo at mein.io>
[renamed to IMG_PARTSIGNATURE, reworked with epoch+vermagic hash]
Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 include/image.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/image.mk b/include/image.mk
index 77d456719711..8755c4832abd 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -44,6 +44,7 @@ IMG_PREFIX_VERCODE:=$(if $(CONFIG_VERSION_CODE_FILENAMES),$(call sanitize,$(VERS
 IMG_PREFIX:=$(VERSION_DIST_SANITIZED)-$(IMG_PREFIX_VERNUM)$(IMG_PREFIX_VERCODE)$(IMG_PREFIX_EXTRA)$(BOARD)$(if $(SUBTARGET),-$(SUBTARGET))
 IMG_ROOTFS:=$(IMG_PREFIX)-rootfs
 IMG_COMBINED:=$(IMG_PREFIX)-combined
+IMG_PART_SIGNATURE:=$(shell echo $(SOURCE_DATE_EPOCH)$(LINUX_VERMAGIC) | mkhash md5 | head --bytes 8)
 
 MKFS_DEVTABLE_OPT := -D $(INCLUDE_DIR)/device_table.txt
 

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