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core/reproducible: do not override SOURCE_DATE_EPOCH

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SOURCE_DATE_EPOCH is currently forcibly set (to either the git commit
date, or the last release date).

However, the spec mandates that it should not be modified if already
set: https://reproducible-builds.org/specs/source-date-epoch/

    Build systems MUST NOT overwrite this variable for child
    processes to consume if it is already present.

Abide by the rule, and only set it if not already set.

This will allow users to pass it from an upper-layer buildsystem (e.g. a
jenkins or gitlab-ci job, for example), when they have a reson to do so.

Reported-by: Peter Korsgaard <peter@korsgaard.com>
Reported-by: Einar Jón Gunnarsson <tolvupostur@gmail.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Einar Jón Gunnarsson <tolvupostur@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 0437d2f8f6)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Yann E. MORIN 2017-11-05 10:14:56 +01:00 committed by Peter Korsgaard
parent e6c01fe3bb
commit 7952623621
1 changed files with 1 additions and 1 deletions
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2
Makefile
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@ -253,7 +253,7 @@ export LANG = C
export LC_ALL = C
export GZIP = -n
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))
export SOURCE_DATE_EPOCH ?= $(if $(wildcard $(TOPDIR)/.git),$(BR2_VERSION_GIT_EPOCH),$(BR2_VERSION_EPOCH))
DEPENDENCIES_HOST_PREREQ += host-fakedate
endif