sha-sync

#!/usr/bin/env python3

import os
import re
import time

import github3

gh = github3.login('kragniz', os.environ.get('password'))

fork_branch = 'data-plane-api-sha-updates'
bazel_path = 'bazel/repository_locations.bzl'


def get_last_commit_sha(repo):
    for commit in repo.iter_commits():
        return commit.sha


def has_open_pr(repo, sha):
    for pull in repo.iter_pulls(state='all', head='kragniz:'+fork_branch):
        if sha[:7] in pull.title:
            print('already made a pr:', pull.title)
            return True
    return False


while True:
    data_plane_repo = gh.repository('envoyproxy', 'data-plane-api')
    envoy_repo      = gh.repository('envoyproxy', 'envoy')
    envoy_repo_fork = gh.repository('kragniz', 'envoy')

    current_data_plane_sha = get_last_commit_sha(data_plane_repo)

    bazel_content = envoy_repo.contents(bazel_path).decoded.decode('utf-8')
    current_sha = re.search(r'envoy_api = dict\(\s+commit = \"([a-z0-9]+)\"', bazel_content, re.MULTILINE).groups()[0]

    if current_sha != current_data_plane_sha:
        print(f'current_sha: {current_sha} != current_data_plane_sha: {current_data_plane_sha}')

        if not has_open_pr(envoy_repo, current_data_plane_sha):
            updated_bazel = bazel_content.replace(current_sha, current_data_plane_sha)

            try:
                envoy_repo_fork.create_ref('refs/heads/'+fork_branch, get_last_commit_sha(envoy_repo))
            except github3.models.GitHubError as e:
                if e.code == 422:
                    envoy_repo_fork.ref('heads/'+fork_branch).update(get_last_commit_sha(envoy_repo), force=True)

            current_fork_commit = envoy_repo_fork.contents(bazel_path, ref=fork_branch).sha
            envoy_repo_fork.update_file(bazel_path,
                                        'build: update data-plane-api sha\n\nSigned-off-by: Louis Taylor <louis@kragniz.eu>',
                                        updated_bazel.encode('utf-8'),
                                        current_fork_commit,
                                        branch=fork_branch)

            print('creating new pull request')
            envoy_repo.create_pull('build: update data-plane-api sha to ' + current_data_plane_sha[:7], 'master', 'kragniz:'+fork_branch)
    else:
        print(f'current_sha: {current_sha} == current_data_plane_sha: {current_data_plane_sha}')
    time.sleep(30)