remote-helpers: add testgit helper

Currently the remote helper infrastructure is only used by the curl
helper, which does not give a good impression of how remote helpers
can be used to interact with foreign repositories. Since implementing
such a helper is non-trivial it would be good to have at least one
easy-to-follow example demonstrating how to implement a helper that
interacts with a foreign vcs using fast-import/fast-export.

The testgit helper can be used to interact with remote git
repositories by prefixing the url with "testgit::".

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/git_remote_helpers/git/importer.py b/git_remote_helpers/git/importer.py
new file mode 100644
index 000000000..af2919d92
--- /dev/null
+++ b/git_remote_helpers/git/importer.py
@@ -0,0 +1,38 @@
+import os
+import subprocess
+
+
+class GitImporter(object):
+    """An importer for testgit repositories.
+
+    This importer simply delegates to git fast-import.
+    """
+
+    def __init__(self, repo):
+        """Creates a new importer for the specified repo.
+        """
+
+        self.repo = repo
+
+    def do_import(self, base):
+        """Imports a fast-import stream to the given directory.
+
+        Simply delegates to git fast-import.
+        """
+
+        dirname = self.repo.get_base_path(base)
+        if self.repo.local:
+            gitdir = self.repo.gitpath
+        else:
+            gitdir = os.path.abspath(os.path.join(dirname, '.git'))
+        path = os.path.abspath(os.path.join(dirname, 'git.marks'))
+
+        if not os.path.exists(dirname):
+            os.makedirs(dirname)
+
+        args = ["git", "--git-dir=" + gitdir, "fast-import", "--quiet", "--export-marks=" + path]
+
+        if os.path.exists(path):
+            args.append("--import-marks=" + path)
+
+        subprocess.check_call(args)