build: introduce SOURCE_DATE_EPOCH variable

[openwrt/svn-archive/archive.git] / scripts / get_source_date_epoch.sh

diff --git a/scripts/get_source_date_epoch.sh b/scripts/get_source_date_epoch.sh
new file mode 100755 (executable)
index 0000000..b8efb76
--- /dev/null
+++ b/scripts/get_source_date_epoch.sh
@@ -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"