From 9befe94baf990ee6331e77edb40e286e9dc4df8d Mon Sep 17 00:00:00 2001 From: Gilles Chanteperdrix Date: Wed, 23 Nov 2016 13:58:40 +0100 Subject: [PATCH] Makefile: generate SOURCE_DATE_EPOCH for reproducible builds MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When reproducibility is requested, generate a global SOURCE_DATE_EPOCH environment variable which contains either the date of Buildroot last commit if running from a git repository, or the latest release date. This means that all packages embedding build dates will appear to have the same build date, so in case of new commit or release, all packages will appear to have been changed, even though some of them may not have changed in fact. The meaning of SOURCE_DATE_EPOCH is specified by the following specification: https://reproducible-builds.org/specs/source-date-epoch/ Signed-off-by: Gilles Chanteperdrix Signed-off-by: Jérôme Pouiller Signed-off-by: Thomas Petazzoni --- Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Makefile b/Makefile index eff814b8c6..8acbe58655 100644 --- a/Makefile +++ b/Makefile @@ -87,6 +87,8 @@ all: # Set and export the version string export BR2_VERSION := 2016.11-rc1 +# Actual time the release is cut (for reproducible builds) +BR2_VERSION_EPOCH = 1478206447 # Save running make version since it's clobbered by the make package RUNNING_MAKE_VERSION := $(MAKE_VERSION) @@ -249,6 +251,8 @@ ifeq ($(BR2_REPRODUCIBLE),y) export TZ=UTC export LANG=C export LC_ALL=C +BR2_VERSION_GIT_EPOCH = $(shell GIT_DIR=$(TOPDIR)/.git $(GIT) log -1 --format=%at) +export SOURCE_DATE_EPOCH = $(if $(wildcard $(TOPDIR)/.git),$(BR2_VERSION_GIT_EPOCH),$(BR2_VERSION_EPOCH)) endif # To put more focus on warnings, be less verbose as default -- 2.30.2