#!/bin/sh -e
# git tarball - export a git tag as tarball with toplevel dir and timestamp

dir=${PWD##*/}
ver=${1?no tag given}
ver=${ver#v}
time=$(git log -1 --date=format:%Y%m%d%H%M.%S --format=%cd "$1")
git archive --prefix="${dir}-${ver}/" -o "${dir}-${ver}.tar.gz" "$1"
touch -t "$time" "${dir}-${ver}.tar.gz"
sha256sum "${dir}-${ver}.tar.gz"