# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this,
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import absolute_import, unicode_literals

import os
import subprocess

# The logic here is far from robust. Improvements are welcome.


def update_mercurial_repo(
    hg, repo, path, revision="default", hostfingerprints=None, global_args=None
):
    """Ensure a HG repository exists at a path and is up to date."""
    hostfingerprints = hostfingerprints or {}

    args = [hg]
    if global_args:
        args.extend(global_args)

    for host, fingerprint in sorted(hostfingerprints.items()):
        args.extend(["--config", "hostfingerprints.%s=%s" % (host, fingerprint)])

    if os.path.exists(path):
        subprocess.check_call(args + ["pull", repo], cwd=path)
    else:
        subprocess.check_call(args + ["clone", repo, path])

    subprocess.check_call([hg, "update", "-r", revision], cwd=path)


def update_git_repo(git, repo, path, revision="origin/master"):
    """Ensure a Git repository exists at a path and is up to date."""
    if os.path.exists(path):
        subprocess.check_call([git, "fetch", "--all"], cwd=path)
    else:
        subprocess.check_call([git, "clone", repo, path])

    subprocess.check_call([git, "checkout", revision], cwd=path)