Allow phabricator to manage repositories

Summary:
This adds a configuration option for repositories to be marked as managed
by phabricator, which is then used by the pullLocal daemon to try to recover
from some errors it runs into.

Test Plan: Set a bogus uri for a repo, saw that the pullLocal daemon fixed it.

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3680

conf/default.conf.php

@@ -1068,6 +1068,19 @@ return array(
   // revision is even older than it is marked as old.
   'differential.days-stale' => 3,
 
+// -- Repositories ---------------------------------------------------------- //
+
+  // The default location in which to store local copies of repositories.
+  // Anything stored in this directory will be assumed to be under the
+  // control of phabricator, which means that Phabricator will try to do some
+  // maintenance on working copies if there are problems (such as a change
+  // to the remote origin url). This maintenance may include completely
+  // removing (and recloning) anything in this directory.
+  //
+  // When set to null, this option is ignored (i.e. Phabricator will not fully
+  // control any working copies).
+  'repository.default-local-path' => null,
+
 // -- Maniphest ------------------------------------------------------------- //
 
   'maniphest.enabled' => true,

src/applications/repository/controller/PhabricatorRepositoryEditController.php

@@ -509,6 +509,12 @@ final class PhabricatorRepositoryEditController
     $inset->setTitle('Repository Information');
 
     if ($has_local) {
+      $default_local_path = '';
+      $default =
+        PhabricatorEnv::getEnvConfig('repository.default-local-path');
+      if (!$repository->getDetail('remote-uri') && $default) {
+        $default_local_path = $default.strtolower($repository->getCallsign());
+      }
       $inset->appendChild(
         '<p class="aphront-form-instructions">Select a path on local disk '.
         'which the daemons should <tt>'.$clone_command.'</tt> the repository '.
@@ -519,7 +525,7 @@ final class PhabricatorRepositoryEditController
         id(new AphrontFormTextControl())
           ->setName('path')
           ->setLabel('Local Path')
-          ->setValue($repository->getDetail('local-path'))
+          ->setValue($repository->getDetail('local-path', $default_local_path))
           ->setError($e_path));
     } else if ($is_svn) {
       $inset->appendChild(

src/applications/repository/daemon/PhabricatorRepositoryPullLocalDaemon.php

@@ -468,6 +468,12 @@ final class PhabricatorRepositoryPullLocalDaemon
 /* -(  Git Implementation  )------------------------------------------------- */
 
 
+  private function canWrite($path) {
+    $default_path =
+      PhabricatorEnv::getEnvConfig('repository.default-local-path');
+    return Filesystem::isDescendant($path, $default_path);
+  }
+
   /**
    * @task git
    */
@@ -495,6 +501,7 @@ final class PhabricatorRepositoryPullLocalDaemon
 
     list($err, $stdout) = $repository->execLocalCommand(
       'rev-parse --show-toplevel');
+    $msg = '';
 
     if ($err) {
 
@@ -505,45 +512,74 @@ final class PhabricatorRepositoryPullLocalDaemon
       if (is_dir($path)) {
         $files = Filesystem::listDirectory($path, $include_hidden = true);
         if (!$files) {
-          throw new Exception(
+          $msg =
             "Expected to find a git repository at '{$path}', but there ".
             "is an empty directory there. Remove the directory: the daemon ".
-            "will run 'git clone' for you.");
+            "will run 'git clone' for you.";
         }
-      }
+      } else {
-
+        $msg =
-      throw new Exception(
         "Expected to find a git repository at '{$path}', but there is ".
         "a non-repository directory (with other stuff in it) there. Move or ".
         "remove this directory (or reconfigure the repository to use a ".
         "different directory), and then either clone a repository yourself ".
-        "or let the daemon do it.");
+        "or let the daemon do it.";
+      }
     } else {
       $repo_path = rtrim($stdout, "\n");
 
       if (empty($repo_path)) {
-        throw new Exception(
+        $err = true;
+        $msg =
           "Expected to find a git repository at '{$path}', but ".
           "there was no result from `git rev-parse --show-toplevel`. ".
           "Something is misconfigured or broken. The git repository ".
-          "may be inside a '.git/' directory.");
+          "may be inside a '.git/' directory.";
-      }
+      } else if (!Filesystem::pathsAreEquivalent($repo_path, $path)) {
-
+        $err = true;
-      if (!Filesystem::pathsAreEquivalent($repo_path, $path)) {
+        $msg =
-        throw new Exception(
           "Expected to find repo at '{$path}', but the actual ".
           "git repository root for this directory is '{$repo_path}'. ".
           "Something is misconfigured. The repository's 'Local Path' should ".
           "be set to some place where the daemon can check out a working ".
-          "copy, and should not be inside another git repository.");
+          "copy, and should not be inside another git repository.";
       }
     }
 
+    if ($err && $this->canWrite($path)) {
+      phlog("{$path} failed sanity check; recloning. ({$msg})");
+      Filesystem::remove($path);
+      $this->executeGitCreate($repository, $path);
+    } else if ($err) {
+      throw new Exception($msg);
+    }
 
+    $retry = false;
+    do {
       // This is a local command, but needs credentials.
       $future = $repository->getRemoteCommandFuture('fetch --all --prune');
       $future->setCWD($path);
-    $future->resolvex();
+      list($err, $stdout, $stderr) = $future->resolve();
+
+      if ($err && !$retry && $this->canWrite($path)) {
+        $retry = true;
+        // Fix remote origin url if it doesn't match our configuration
+        $origin_url =
+          $repository->execLocalCommand('config --get remote.origin.url');
+        $remote_uri = $repository->getDetail('remote-uri');
+        if ($origin_url != $remote_uri) {
+          $repository->execLocalCommand('remote set-url origin %s',
+                                        $remote_uri);
+        }
+      } else if ($err) {
+        throw new Exception(
+          "git fetch failed with error #{$err}:\n".
+          "stdout:{$stdout}\n\n".
+          "stderr:{$stderr}\n");
+      } else {
+        $retry = false;
+      }
+    } while ($retry);
   }