openwrt/scripts/get_source_date_epoch.sh

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#!/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 "$SOURCE_DATE_EPOCH" ]
}
try_git() {
[ -e .git ] || return 1
SOURCE_DATE_EPOCH="$(git log -1 --format=format:%ct)"
[ -n "$SOURCE_DATE_EPOCH" ]
}
try_hg() {
[ -d .hg ] || return 1
SOURCE_DATE_EPOCH="$(hg log --template '{date}' -l 1 | cut -d. -f1)"
[ -n "$SOURCE_DATE_EPOCH" ]
}
try_mtime() {
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"