Store pusher remote address and push protocol in PushLog

Summary: Ref T4195. Stores remote address and protocol in the logs, where possible.

Test Plan: Pushed some stuff, looked at the log, saw data.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4195

Differential Revision: https://secure.phabricator.com/D7711

src/applications/diffusion/ssh/DiffusionSSHWorkflow.php

@@ -18,9 +18,19 @@ abstract class DiffusionSSHWorkflow extends PhabricatorSSHWorkflow {
   }
 
   public function getEnvironment() {
-    return array(
-      'PHABRICATOR_USER' => $this->getUser()->getUsername(),
+    $env = array(
+      DiffusionCommitHookEngine::ENV_USER => $this->getUser()->getUsername(),
+      DiffusionCommitHookEngine::ENV_REMOTE_PROTOCOL => 'ssh',
     );
+
+    $ssh_client = getenv('SSH_CLIENT');
+    if ($ssh_client) {
+      // This has the format "<ip> <remote-port> <local-port>". Grab the IP.
+      $remote_address = head(explode(' ', $ssh_client));
+      $env[DiffusionCommitHookEngine::ENV_REMOTE_ADDRESS] = $remote_address;
+    }
+
+    return $env;
   }
 
   abstract protected function executeRepositoryOperations();