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

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

  commit 95f4bbd581 ("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 8664ab7deb ("Set time and umask on multi-dtb fit images to
  ensure reproducibile builds.")

Signed-off-by: Vagrant Cascadian <vagrant@reproducible-builds.org>
This commit is contained in:
Vagrant Cascadian 2019-05-02 11:14:12 -07:00 committed by Tom Rini
parent 3ee8d91328
commit 878e2a50b5
1 changed files with 4 additions and 0 deletions
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4
Makefile
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@ -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 \