diff mbox

[v4,01/18] reproducibility: generate SOURCE_DATE_EPOCH

Message ID 1479905937-17241-2-git-send-email-jezz@sysmic.org
State Accepted
Headers show

Commit Message

Jérôme Pouiller Nov. 23, 2016, 12:58 p.m. UTC 
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>

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 <gilles.chanteperdrix@xenomai.org>
Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
---

Notes:
    v4:
     - s/SOURCE_DATE_GIT/BR2_VERSION_GIT_EPOCH/
    v3:
     - Fix typo in commit message (Arnout)
     - Introduce BR2_VERSION_EPOCH (Thomas and Arnout)
     - Set and export SOURCE_DATE_EPOCH together (Thomas)

 Makefile | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Thomas Petazzoni Nov. 23, 2016, 9:49 p.m. UTC | #1 
Hello,

On Wed, 23 Nov 2016 13:58:40 +0100, Jérôme Pouiller wrote:
> From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
> 
> 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 <gilles.chanteperdrix@xenomai.org>
> Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
> ---

Applied to next, thanks.

Thomas
diff mbox

Patch

diff --git a/Makefile b/Makefile
index eff814b..8acbe58 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