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build: introduce SOURCE_DATE_EPOCH variable

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SOURCE_DATE_EPOCH is the date of the last modified file using git/svn
as date source.
See https://reproducible-builds.org/specs/source-date-epoch/

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 48584
This commit is contained in:
Felix Fietkau 2016-01-31 23:29:07 +00:00
parent 2f14514a12
commit 82522dbaee
2 changed files with 32 additions and 0 deletions
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1
include/toplevel.mk
View file

@ -24,6 +24,7 @@ export RELEASE
export REVISION
export GIT_CONFIG_PARAMETERS='core.autocrlf=false'
export MAKE_JOBSERVER=$(filter --jobserver%,$(MAKEFLAGS))
export SOURCE_DATE_EPOCH:=$(shell $(TOPDIR)/scripts/get_source_date_epoch.sh)
# prevent perforce from messing with the patch utility
unexport P4PORT P4USER P4CONFIG P4CLIENT

31
scripts/get_source_date_epoch.sh Executable file
View file

@ -0,0 +1,31 @@
#!/usr/bin/env bash
export LANG=C
export LC_ALL=C
[ -n "$TOPDIR" ] && cd $TOPDIR
try_version() {
[ -f version.date ] || return 1
SOURCE_DATE_EPOCH="$(cat version.date)"
[ -n "$SOURCE_DATE_EPOCH" ]
}
try_svn() {
[ -d .svn ] || return 1
SOURCE_DATE_EPOCH="$(./scripts/portable_date.sh "$(svn info --show-item last-changed-date)" +%s)"
[ -n "$SOURCE_DATE_EPOCH" ]
}
try_git() {
[ -e .git ] || return 1
SOURCE_DATE_EPOCH="$(git log -1 --format=format:%ct)"
[ -n "$SOURCE_DATE_EPOCH" ]
}
try_hg() {
[ -d .hg ] || return 1
SOURCE_DATE_EPOCH=""
[ -n "$SOURCE_DATE_EPOCH" ]
}
try_version || try_svn || try_git || try_hg || SOURCE_DATE_EPOCH=""
echo "$SOURCE_DATE_EPOCH"