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authorBill Richardson <wfrichar@chromium.org>2015-02-24 08:55:01 -0800
committerChromeOS Commit Bot <chromeos-commit-bot@chromium.org>2015-02-25 03:33:18 +0000
commit8a94ea4fbd7ef283af35ec5aa472a819f5a2a337 (patch)
treede0e2c69572363eefb20665d1a1cddccdbca8fcd /Makefile.rules
parente20d019fc4494d2340b227ed0c42c29ca39c85d3 (diff)
downloadchrome-ec-8a94ea4fbd7ef283af35ec5aa472a819f5a2a337.tar.gz
Add USE_GIT_DATE=1 to make args to build repeatable images
Up until now, every image includes the time of compilation in the build information. This makes it impossible to verify that a particular image came from a particular source code snapshot. With this change, specifying USE_GIT_DATE=1 to the make command will use the author date of HEAD as the timestamp. That means that successive builds from the same source will produce bitwise-identical output (assuming the same toolchain, of course). BUG=none BRANCH=none TEST=manual Do this twice: \rm -rf build make BOARD=cr50 USE_GIT_DATE=1 md5sum build/cr50/ec.bin The md5sum should be the same for both runs. Change-Id: If64307101a453cb13c62fa003f1bf432f4998273 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/252751 Reviewed-by: Randall Spangler <rspangler@chromium.org>
Diffstat (limited to 'Makefile.rules')
-rw-r--r--Makefile.rules2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile.rules b/Makefile.rules
index 204988036e..80ac99d9b3 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -53,7 +53,7 @@ cmd_c_to_build = $(BUILDCC) $(BUILD_CFLAGS) \
cmd_c_to_host = $(HOSTCC) $(HOST_CFLAGS) -MMD -MF $@.d -o $@ \
$(sort $(foreach c,$($(*F)-objs),util/$(c:%.o=%.c)) $*.c)
cmd_host_test = ./util/run_host_test $* $(silent)
-cmd_date = ./util/getdate.sh > $@
+cmd_date = $(if $(USE_GIT_DATE),cat /dev/null,./util/getdate.sh) > $@
cmd_version = ./util/getversion.sh > $@
cmd_mv_from_tmp = mv $(out)/$*.bin.tmp $(out)/$*.bin
cmd_extractrw-y = dd if=$(out)/$(PROJECT).bin.tmp of=$(out)/$(PROJECT).RW.bin \