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, 61 insertions, 0 deletions

diff --git a/git_remote_helpers/git/non_local.py b/git_remote_helpers/git/non_local.py
new file mode 100644
index 0000000000..d75ef8f214
--- /dev/null
+++ b/git_remote_helpers/git/non_local.py
@@ -0,0 +1,61 @@
+import os
+import subprocess
+
+from git_remote_helpers.util import die, warn
+
+
+class NonLocalGit(object):
+    """Handler to interact with non-local repos.
+    """
+
+    def __init__(self, repo):
+        """Creates a new non-local handler for the specified repo.
+        """
+
+        self.repo = repo
+
+    def clone(self, base):
+        """Clones the non-local repo to base.
+
+        Does nothing if a clone already exists.
+        """
+
+        path = os.path.join(self.repo.get_base_path(base), '.git')
+
+        # already cloned
+        if os.path.exists(path):
+            return path
+
+        os.makedirs(path)
+        args = ["git", "clone", "--bare", "--quiet", self.repo.gitpath, path]
+
+        subprocess.check_call(args)
+
+        return path
+
+    def update(self, base):
+        """Updates checkout of the non-local repo in base.
+        """
+
+        path = os.path.join(self.repo.get_base_path(base), '.git')
+
+        if not os.path.exists(path):
+            die("could not find repo at %s", path)
+
+        args = ["git", "--git-dir=" + path, "fetch", "--quiet", self.repo.gitpath]
+        subprocess.check_call(args)
+
+        args = ["git", "--git-dir=" + path, "update-ref", "refs/heads/master", "FETCH_HEAD"]
+        subprocess.check_call(args)
+
+    def push(self, base):
+        """Pushes from the non-local repo to base.
+        """
+
+        path = os.path.join(self.repo.get_base_path(base), '.git')
+
+        if not os.path.exists(path):
+            die("could not find repo at %s", path)
+
+        args = ["git", "--git-dir=" + path, "push", "--quiet", self.repo.gitpath]
+        subprocess.check_call(args)