#!/usr/bin/python2

from multiprocessing import Pool
import subprocess
import tempfile


def explode_ref(ref, dest):
    """Write contents from ref to dest dir"""
    p1 = subprocess.Popen(['git', 'archive', ref], stdout=subprocess.PIPE)
    p2 = subprocess.Popen(['tar', '-x'], cwd=dest, stdin=p1.stdout)
    p1.stdout.close()
    p2.communicate()


def checkout_run(cmd, ref='HEAD'):
    """Run command in a fresh checkout of ref and return output"""
    tempdir = tempfile.mkdtemp()
    explode_ref(ref, tempdir)
    try:
        output = subprocess.check_output(cmd, cwd=tempdir,
                    stderr=subprocess.STDOUT)
    except subprocess.CalledProcessError as e:
        print("Command failed with code %s" % e.returncode)
        output = e.output
    return output


def run_test():
    return checkout_run(['make', 'test'])


def run_test3():
    return checkout_run(['make', 'test3'])


def main():
    """Run our test targets in parallel using fresh checkouts of HEAD"""
    print("Running tests...")
    p = Pool(2)
    results = [p.apply_async(f) for f in [run_test, run_test3]]
    for r in results:
        print(r.get().decode('utf-8'))
    p.close()


if __name__ == '__main__':
    main()
