Fix various branch/ref issues with bare repositories in Git

Summary:
Ref T2230. Although all the non-bare commands //run// fine in bare repos, not all of them do exactly the same thing.

This could use further cleanup, but at least get it working again for now.

Test Plan: Ran `bin/repository pull`, `bin/repository discover`, viewed Diffusion (looked at branch table), viewed a commit (looked at "Branches"), for bare and non-bare git repos.

Reviewers: avive, btrahan, avivey

Reviewed By: avivey

CC: aran

Maniphest Tasks: T2230

Differential Revision: https://secure.phabricator.com/D7442

src/applications/diffusion/conduit/ConduitAPI_diffusion_branchquery_Method.php

@@ -30,14 +30,22 @@ final class ConduitAPI_diffusion_branchquery_Method
     // We need to add 1 in case we pick up HEAD.
     $count = $offset + $limit + 1;
 
+    if ($repository->isWorkingCopyBare()) {
+      list($stdout) = $repository->execxLocalCommand(
+        'for-each-ref %C --sort=-creatordate --format=%s refs/heads',
+        $count ? '--count='.(int)$count : null,
+        '%(refname:short) %(objectname)');
+      $branch_list = DiffusionGitBranch::parseLocalBranchOutput(
+        $stdout);
+    } else {
       list($stdout) = $repository->execxLocalCommand(
         'for-each-ref %C --sort=-creatordate --format=%s refs/remotes',
         $count ? '--count='.(int)$count : null,
         '%(refname:short) %(objectname)');
-
       $branch_list = DiffusionGitBranch::parseRemoteBranchOutput(
         $stdout,
         $only_this_remote = DiffusionBranchInformation::DEFAULT_GIT_REMOTE);
+    }
 
     $branches = array();
     foreach ($branch_list as $name => $head) {

src/applications/diffusion/conduit/ConduitAPI_diffusion_commitbranchesquery_Method.php

@@ -25,14 +25,21 @@ final class ConduitAPI_diffusion_commitbranchesquery_Method
     $repository = $drequest->getRepository();
     $commit = $request->getValue('commit');
 
+    if ($repository->isWorkingCopyBare()) {
+      list($contains) = $repository->execxLocalCommand(
+        'branch --verbose --no-abbrev --contains %s',
+        $commit);
+      return DiffusionGitBranch::parseLocalBranchOutput(
+        $contains);
+    } else {
       list($contains) = $repository->execxLocalCommand(
         'branch -r --verbose --no-abbrev --contains %s',
         $commit);
-
       return DiffusionGitBranch::parseRemoteBranchOutput(
         $contains,
         DiffusionBranchInformation::DEFAULT_GIT_REMOTE);
     }
+  }
 
   protected function getMercurialResult(ConduitAPIRequest $request) {
     $drequest = $this->getDiffusionRequest();

src/applications/diffusion/data/DiffusionGitBranch.php

@@ -70,4 +70,31 @@ final class DiffusionGitBranch {
 
     return $map;
   }
+
+  /**
+   * As above, but with no `-r`. Used for bare repositories.
+   */
+  public static function parseLocalBranchOutput($stdout) {
+    $map = array();
+
+    $lines = array_filter(explode("\n", $stdout));
+    $regex = '/^[* ]*(\(no branch\)|\S+)\s+([a-z0-9]{40})/';
+    foreach ($lines as $line) {
+      $matches = null;
+      if (!preg_match($regex, $line, $matches)) {
+        throw new Exception("Failed to parse {$line}!");
+      }
+
+      $branch = $matches[1];
+      $branch_head = $matches[2];
+      if ($branch == '(no branch)') {
+        continue;
+      }
+
+      $map[$branch] = $branch_head;
+    }
+
+    return $map;
+  }
+
 }

src/applications/repository/daemon/PhabricatorRepositoryPullLocalDaemon.php

@@ -526,12 +526,18 @@ final class PhabricatorRepositoryPullLocalDaemon
       $repository->getRemoteURI(),
       $repository->getLocalPath());
 
+    if ($repository->isWorkingCopyBare()) {
+      list($stdout) = $repository->execxLocalCommand(
+        'branch --verbose --no-abbrev');
+      $branches = DiffusionGitBranch::parseLocalBranchOutput(
+        $stdout);
+    } else {
       list($stdout) = $repository->execxLocalCommand(
         'branch -r --verbose --no-abbrev');
-
       $branches = DiffusionGitBranch::parseRemoteBranchOutput(
         $stdout,
         $only_this_remote = DiffusionBranchInformation::DEFAULT_GIT_REMOTE);
+    }
 
     if (!$branches) {
       // This repository has no branches at all, so we don't need to do

src/applications/repository/engine/PhabricatorRepositoryPullEngine.php

@@ -177,7 +177,16 @@ final class PhabricatorRepositoryPullEngine
     $retry = false;
     do {
       // This is a local command, but needs credentials.
-      $future = $repository->getRemoteCommandFuture('fetch --all --prune');
+      if ($repository->isWorkingCopyBare()) {
+        // For bare working copies, we need this magic incantation.
+        $future = $repository->getRemoteCommandFuture(
+          'fetch origin %s --prune',
+          '+refs/heads/*:refs/heads/*');
+      } else {
+        $future = $repository->getRemoteCommandFuture(
+          'fetch --all --prune');
+      }
+
       $future->setCWD($path);
       list($err, $stdout, $stderr) = $future->resolve();
 

src/applications/repository/storage/PhabricatorRepository.php

@@ -786,6 +786,25 @@ final class PhabricatorRepository extends PhabricatorRepositoryDAO
     Filesystem::assertReadable($local);
   }
 
+  /**
+   * Determine if the working copy is bare or not. In Git, this corresponds
+   * to `--bare`. In Mercurial, `--noupdate`.
+   */
+  public function isWorkingCopyBare() {
+    switch ($this->getVersionControlSystem()) {
+      case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
+      case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
+        return false;
+      case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
+        $local = $this->getLocalPath();
+        if (Filesystem::pathExists($local.'/.git')) {
+          return false;
+        } else {
+          return true;
+        }
+    }
+  }
+
 
 /* -(  PhabricatorPolicyInterface  )----------------------------------------- */