OpenWrt – Rev 1

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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"