openwrt/scripts/get_source_date_epoch.sh

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#!/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 "$SOURCE" log -1 --format=format:%ct \
"$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"