#!/usr/bin/python3

# Copyright (C) 2018-2019  Simon Ruderich
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import os
import subprocess
import sys


sha1 = sys.argv[1]

repo_path = os.environ['OLDPWD']
submodule_path = os.getcwd()
submodule = os.path.relpath(submodule_path, repo_path)

evtag = subprocess.check_output(['git-evtag-compute-py', sha1]) \
        .decode('ascii') \
        .split('\n')
assert evtag[0].startswith('# git-evtag comment: ')
assert evtag[1].startswith('Git-EVTag-v0-SHA512: ')

os.chdir(repo_path)

log = subprocess.check_output(['git', 'log', '-1', '--', submodule]) \
        .decode('ascii')

found_comment = False
found_evtag = False
for line in log.split('\n'):
    if evtag[0] in line:
        found_comment = True
    elif evtag[1] in line:
        found_evtag = True

if not found_comment or not found_evtag:
    print('missing or invalid evtag, aborting')
    sys.exit(1)

subprocess.check_call(['git', 'submodule', 'update', '--checkout', '--',
    submodule])