Remove dependence on callsigns from bin/commit-hook

Summary:
Ref T4245. Two effects:

  - First, let hooks work for future repositories without callsigns.
  - Second, provide a better error when users push directly to hosted repositories.

Test Plan: Ran `bin/commit-hook PHID-REPO-xxx`.

Reviewers: chad, avivey

Reviewed By: avivey

Maniphest Tasks: T4245

Differential Revision: https://secure.phabricator.com/D15293

scripts/repository/commit_hook.php

@@ -32,14 +32,14 @@ $root = dirname(dirname(dirname(__FILE__)));
 require_once $root.'/scripts/__init_script__.php';
 
 if ($argc < 2) {
-  throw new Exception(pht('usage: commit-hook <callsign>'));
+  throw new Exception(pht('usage: commit-hook <repository>'));
 }
 
 $engine = new DiffusionCommitHookEngine();
 
 $repository = id(new PhabricatorRepositoryQuery())
   ->setViewer(PhabricatorUser::getOmnipotentUser())
-  ->withCallsigns(array($argv[1]))
+  ->withIdentifiers(array($argv[1]))
   ->needProjectPHIDs(true)
   ->executeOne();
 
@@ -62,8 +62,9 @@ if ($repository->isGit() || $repository->isHg()) {
   if (!strlen($username)) {
     throw new Exception(
       pht(
-        'Usage: %s should be defined!',
-        DiffusionCommitHookEngine::ENV_USER));
+        'No Direct Pushes: You are pushing directly to a repository hosted '.
+        'by Phabricator. This will not work. See "No Direct Pushes" in the '.
+        'documentation for more information.'));
   }
 
   if ($repository->isHg()) {
@@ -77,7 +78,7 @@ if ($repository->isGit() || $repository->isHg()) {
   // specify the correct user; read this user out of the commit log.
 
   if ($argc < 4) {
-    throw new Exception(pht('usage: commit-hook <callsign> <repo> <txn>'));
+    throw new Exception(pht('usage: commit-hook <repository> <repo> <txn>'));
   }
 
   $svn_repo = $argv[2];