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Add USE_GIT_DATE=1 to make args to build repeatable images

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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>
This commit is contained in:
Bill Richardson
2015-02-24 08:55:01 -08:00
committed by ChromeOS Commit Bot
parent e20d019fc4
commit 8a94ea4fbd
2 changed files with 8 additions and 1 deletions
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2
Makefile.rules
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@@ -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 \

7
util/getversion.sh
View File

@@ -31,6 +31,8 @@ fi
ver="${BOARD}_${vbase}"
gitdate=$(git log -1 --format='%ai' HEAD | cut -d ' ' -f '1 2')
echo "/* This file is generated by util/getversion.sh */"
echo "/* Version string for use by common/version.c */"
@@ -47,3 +49,8 @@ echo "/* Sub-fields for use in Makefile.rules and to form build info string"
echo " * in common/version.c. */"
echo "#define VERSION \"${ver}\""
echo "#define BUILDER \"${USER}@`hostname`\""
echo "/* Author date of last commit, in case compile-time is not used. */"
echo "#ifndef DATE"
echo "#define DATE \"${gitdate}\""
echo "#endif"