1 files changed, 146 insertions, 0 deletions
diff --git a/cgit/repos/cgit.py b/cgit/repos/cgit.py
new file mode 100644
index 0000000..bb010d3
--- /dev/null
+++ b/cgit/repos/cgit.py
@@ -0,0 +1,146 @@
+# Copyright (c) 2018 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "cgit repos" project.
+# For details, see https://github.com/egor-tensin/cgit-repos.
+# Distributed under the MIT License.
+
+from enum import Enum
+import logging
+import os
+import os.path
+import shutil
+
+from cgit.repos.utils import chdir, check_output, run
+
+
+_ENV = os.environ.copy()
+_ENV['GIT_SSH_COMMAND'] = 'ssh -oBatchMode=yes -oLogLevel=QUIET -oStrictHostKeyChecking=no -oUserKnownHostsFile=/dev/null'
+
+
+def _run(*args, **kwargs):
+    return run(*args, env=_ENV, **kwargs)
+
+
+def _check_output(*args, **kwargs):
+    return check_output(*args, env=_ENV, **kwargs)
+
+
+class CGit:
+    def __init__(self, clone_url):
+        self.clone_url = clone_url
+
+    def get_clone_url(self, repo):
+        if self.clone_url is None:
+            return None
+        return self.clone_url.format(repo_id=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)
+        cgit_clone_url = self.cgit.get_clone_url(repo)
+        if cgit_clone_url is not None:
+            clone_urls.append(cgit_clone_url)
+        if not clone_urls:
+            return None
+        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