Commit 878e2a50 authored by Vagrant Cascadian's avatar Vagrant Cascadian Committed by Tom Rini

Set time and umask on fit-dtb.blob to ensure reproducibile builds.

Support for compressed fit-dtb.blob was added in:

  commit 95f4bbd5 ("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 8664ab7d ("Set time and umask on multi-dtb fit images to
  ensure reproducibile builds.")
Signed-off-by: 's avatarVagrant Cascadian <vagrant@reproducible-builds.org>
parent 3ee8d913
......@@ -1058,6 +1058,10 @@ fit-dtb.blob.lzo: fit-dtb.blob
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 \
......
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