Serve git writes over SSH

Summary: Looks like this is pretty straightforward; same as the reads except mark it as needing PUSH.

Test Plan: Ran `git push`, pushed over SSH to a hosted repo.

Reviewers: btrahan

Reviewed By: btrahan

CC: hach-que, aran

Maniphest Tasks: T2230

Differential Revision: https://secure.phabricator.com/D7425

src/applications/diffusion/ssh/DiffusionSSHGitReceivePackWorkflow.php

@@ -0,0 +1,34 @@
+<?php
+
+final class DiffusionSSHGitReceivePackWorkflow
+  extends DiffusionSSHGitWorkflow {
+
+  public function didConstruct() {
+    $this->setName('git-receive-pack');
+    $this->setArguments(
+      array(
+        array(
+          'name'      => 'dir',
+          'wildcard'  => true,
+        ),
+      ));
+  }
+
+  public function isReadOnly() {
+    return false;
+  }
+
+  public function getRequestPath() {
+    $args = $this->getArgs();
+    return head($args->getArg('dir'));
+  }
+
+  protected function executeRepositoryOperations(
+    PhabricatorRepository $repository) {
+    $future = new ExecFuture(
+      'git-receive-pack %s',
+      $repository->getLocalPath());
+    return $this->passthruIO($future);
+  }
+
+}