Initial commit

scripts/get_source_date_epoch.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+export LANG=C
+export LC_ALL=C
+
+if [ -n "$TOPDIR" ]; then
+	cd "$TOPDIR" || exit 1
+fi
+
+SOURCE="${1:-.}"
+
+try_version() {
+	[ -f "$SOURCE/version.date" ] || return 1
+	SOURCE_DATE_EPOCH=$(cat "$SOURCE/version.date")
+	[ -n "$SOURCE_DATE_EPOCH" ]
+}
+
+try_git() {
+	SOURCE_DATE_EPOCH=$(git -C "$SOURCE" log -1 --no-show-signature \
+		--format=format:%ct "$SOURCE" 2>/dev/null)
+	[ -n "$SOURCE_DATE_EPOCH" ]
+}
+
+try_hg() {
+	SOURCE_DATE_EPOCH=$(hg --cwd "$SOURCE" log --template '{date}' -l 1 \
+		"$SOURCE" 2>/dev/null | cut -d. -f1)
+	[ -n "$SOURCE_DATE_EPOCH" ]
+}
+
+try_mtime() {
+	SOURCE_DATE_EPOCH=$(perl -e 'print((stat $ARGV[0])[9])' "$0")
+	[ -n "$SOURCE_DATE_EPOCH" ]
+}
+
+try_version || try_git || try_hg || try_mtime || SOURCE_DATE_EPOCH=""
+echo "$SOURCE_DATE_EPOCH"