build: image: add common and reproducible IMG_PART_SIGNATURE variable

[openwrt/staging/rmilecki.git] / include / image.mk

diff --git a/include/image.mk b/include/image.mk
index 77d456719711022e3cbea3cad296087385ddf1f9..8755c4832abde828694df97be99d3756b8d63885 100644 (file)
--- 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