Set time and umask on fit-dtb.blob to ensure reproducibile builds.
Support for compressed fit-dtb.blob was added in:
commit 95f4bbd581cf ("lib: fdt: Allow LZO and GZIP DT compression in
U-Boot")
When building compressed (lzop, gzip) fit-dtb.blob images, the
compression tool may embed the time or umask in the image.
Work around this by manually setting the time of the source file using
SOURCE_DATE_EPOCH and a hard-coded 0600 umask.
With gzip, this could be accomplished by using -n/--no-name, but lzop
has no current workaround:
https://bugs.debian.org/896520
This is essentially the same fix applied to multi-dtb fit SPL images in:
commit 8664ab7debab ("Set time and umask on multi-dtb fit images to
ensure reproducibile builds.")
Signed-off-by: Vagrant Cascadian <vagrant@reproducible-builds.org>
diff --git a/Makefile b/Makefile
index d122476..afe3bbe 100644
--- a/Makefile
+++ b/Makefile
@@ -1058,6 +1058,10 @@
fit-dtb.blob: dts/dt.dtb FORCE
$(call if_changed,mkimage)
+ifneq ($(SOURCE_DATE_EPOCH),)
+ touch -d @$(SOURCE_DATE_EPOCH) fit-dtb.blob
+ chmod 0600 fit-dtb.blob
+endif
MKIMAGEFLAGS_fit-dtb.blob = -f auto -A $(ARCH) -T firmware -C none -O u-boot \
-a 0 -e 0 -E \