refactor to make for proper code

1 files changed, 223 insertions, 0 deletions

diff --git a/pull/pull.py b/pull/pull.py
new file mode 100644
index 0000000..5e123a9
--- /dev/null
+++ b/pull/pull.py
@@ -0,0 +1,223 @@
+from argparse import ArgumentParser
+import contextlib
+from enum import Enum
+import logging
+import os
+import os.path
+import shutil
+import socket
+import sys
+import subprocess
+
+from pull.registry import MY_REPOS
+
+
+env = os.environ.copy()
+env['GIT_SSH_COMMAND'] = 'ssh -oStrictHostKeyChecking=no -oBatchMode=yes'
+
+DEFAULT_OUTPUT_DIR = 'output'
+
+DEFAULT_CGIT_CLONE_USER = 'egor'
+DEFAULT_CGIT_CLONE_HOST = 'tensin-ext1.home'
+DEFAULT_CGIT_CLONE_PORT = 8080
+
+
+def set_up_logging():
+    logging.basicConfig(
+        level=logging.DEBUG,
+        datefmt='%Y-%m-%d %H:%M:%S',
+        format='%(asctime)s | %(levelname)s | %(message)s')
+
+
+def parse_args(argv=None):
+    if argv is None:
+        argv = sys.argv[1:]
+    parser = ArgumentParser()
+    parser.add_argument('--output', default=DEFAULT_OUTPUT_DIR,
+                        help='output directory path')
+    parser.add_argument('--cgit-user', default=DEFAULT_CGIT_CLONE_USER,
+                        help='cgit clone username')
+    parser.add_argument('--cgit-host', default=DEFAULT_CGIT_CLONE_HOST,
+                        help='cgit clone host')
+    parser.add_argument('--cgit-port', default=DEFAULT_CGIT_CLONE_PORT,
+                        help='cgit clone port number', type=int)
+    return parser.parse_args(argv)
+
+
+def check_output(*args, stdout=subprocess.PIPE):
+    result = subprocess.run(args, stdout=stdout, stderr=subprocess.STDOUT,
+                            env=env, encoding='utf-8')
+    try:
+        result.check_returncode()
+        if stdout != subprocess.DEVNULL:
+            if result.stdout is None:
+                logging.debug('%s', args)
+            else:
+                logging.debug('%s\n%s', args, result.stdout)
+        return result.returncode == 0, result.stdout
+    except subprocess.CalledProcessError as e:
+        if stdout != subprocess.DEVNULL:
+            logging.error('%s\n%s', e, e.output)
+        return e.returncode == 0, e.output
+
+
+def run(*args, discard_output=False):
+    if discard_output:
+        success, _ = check_output(*args, stdout=subprocess.DEVNULL)
+    else:
+        success, _ = check_output(*args)
+    return success
+
+
+@contextlib.contextmanager
+def chdir(new_cwd):
+    old_cwd = os.getcwd()
+    os.chdir(new_cwd)
+    try:
+        yield
+    finally:
+        os.chdir(old_cwd)
+
+
+class CGit:
+    def __init__(self, user, host, port):
+        self.user = user
+        self.host = host
+        self.ip = socket.gethostbyname(self.host)
+        self.port = port
+
+    def get_clone_url(self, repo):
+        return f'http://{self.user}@{self.ip}:{self.port}/git/{repo.repo_id}'
+
+
+class CGitRC:
+    def __init__(self, cgit):
+        self.cgit = cgit
+
+    def write(self, path, repo):
+        with open(path, 'w') as fd:
+            self._write_field(fd, 'clone-url', self._build_clone_url(repo))
+            self._write_field(fd, 'owner', repo.owner)
+            self._write_field(fd, 'desc', repo.desc)
+            self._write_field(fd, 'homepage', repo.homepage)
+
+    @staticmethod
+    def _write_field(fd, field, value):
+        if value is None:
+            return
+        fd.write(f'{field}={value}\n')
+
+    def _build_clone_url(self, repo):
+        clone_urls = []
+        if repo.clone_url is not None:
+            clone_urls.append(repo.clone_url)
+        clone_urls.append(self.cgit.get_clone_url(repo))
+        clone_urls = ' '.join(clone_urls)
+        return clone_urls
+
+
+class Output:
+    def __init__(self, output_dir, cgit):
+        self.output_dir = self._make_dir(output_dir)
+        self.cgitrc = CGitRC(cgit)
+
+    @staticmethod
+    def _make_dir(rel_path):
+        abs_path = os.path.abspath(rel_path)
+        os.makedirs(abs_path, exist_ok=True)
+        return abs_path
+
+    def get_repo_dir(self, repo):
+        return os.path.join(self.output_dir, repo.repo_id)
+
+    def get_cgitrc_path(self, repo):
+        return os.path.join(self.get_repo_dir(repo), 'cgitrc')
+
+    def pull(self, repo):
+        success = False
+        verdict = self.judge(repo)
+        if verdict is RepoVerdict.SHOULD_MIRROR:
+            success = self.mirror(repo)
+        elif verdict is RepoVerdict.SHOULD_UPDATE:
+            success = self.update(repo)
+        elif verdict is RepoVerdict.CANT_DECIDE:
+            success = False
+        else:
+            raise NotImplementedError(f'Unknown repository verdict: {verdict}')
+        if success:
+            self.cgitrc.write(self.get_cgitrc_path(repo), repo)
+        return success
+
+    def judge(self, repo):
+        repo_dir = self.get_repo_dir(repo)
+        if not os.path.isdir(repo_dir):
+            return RepoVerdict.SHOULD_MIRROR
+        with chdir(repo_dir):
+            if not run('git', 'rev-parse', '--is-inside-work-tree', discard_output=True):
+                logging.warning('Not a repository, so going to mirror: %s', repo_dir)
+                return RepoVerdict.SHOULD_MIRROR
+            success, output = check_output('git', 'config', '--get', 'remote.origin.url')
+            if not success:
+                # Every repository managed by this script should have the
+                # 'origin' remote. If it doesn't, it's trash.
+                return RepoVerdict.SHOULD_MIRROR
+            if f'{repo.clone_url}\n' != output:
+                logging.warning("Existing repository '%s' URL doesn't match the specified clone" \
+                                " URL: %s", repo.repo_id, repo.clone_url)
+                return RepoVerdict.CANT_DECIDE
+            # Looks like a legit clone of the specified remote.
+            return RepoVerdict.SHOULD_UPDATE
+
+    def mirror(self, repo):
+        logging.info("Mirroring repository '%s' from: %s", repo.repo_id,
+                     repo.clone_url)
+        repo_dir = self.get_repo_dir(repo)
+        if os.path.isdir(repo_dir):
+            try:
+                shutil.rmtree(repo_dir)
+            except Exception as e:
+                logging.exception(e)
+                return False
+        return run('git', 'clone', '--mirror', repo.clone_url, repo_dir)
+
+    def update(self, repo):
+        logging.info("Updating repository '%s'", repo.repo_id)
+        repo_dir = self.get_repo_dir(repo)
+        with chdir(repo_dir):
+            if not run('git', 'remote', 'update', '--prune'):
+                return False
+            if run('git', 'rev-parse', '--verify', '--quiet', 'origin/master', discard_output=True):
+                if not run('git', 'reset', '--soft', 'origin/master'):
+                    return False
+            return True
+
+
+class RepoVerdict(Enum):
+    SHOULD_MIRROR = 1
+    SHOULD_UPDATE = 2
+    CANT_DECIDE = 3
+
+
+def main(args=None):
+    set_up_logging()
+    try:
+        args = parse_args(args)
+        cgit = CGit(args.cgit_user, args.cgit_host, args.cgit_port)
+        output = Output(args.output, cgit)
+        success = True
+        for repo in MY_REPOS:
+            if not output.pull(repo):
+                success = False
+        if success:
+            logging.info('All repositories were updated successfully')
+            return 0
+        else:
+            logging.warning("Some repositories couldn't be updated!")
+            return 1
+    except Exception as e:
+        logging.exception(e)
+        raise
+
+
+if __name__ == '__main__':
+    sys.exit(main())