README: add install details

Change-Id: I57043449a7927068fa5735cb71633353e1039532
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/245816
Reviewed-by: David Pursehouse <dpursehouse@collab.net>
Tested-by: Mike Frysinger <vapier@google.com>

README.md

@@ -14,3 +14,22 @@ that you can put anywhere in your path.
 * [repo Manifest Format](./docs/manifest-format.md)
 * [repo Hooks](./docs/repo-hooks.md)
 * [Submitting patches](./SUBMITTING_PATCHES.md)
+
+## Install
+
+Many distros include repo, so you might be able to install from there.
+```sh
+# Debian/Ubuntu.
+$ sudo apt-get install repo
+
+# Gentoo.
+$ sudo emerge dev-vcs/repo
+```
+
+You can install it manually as well as it's a single script.
+```sh
+$ mkdir -p ~/.bin
+$ PATH="${HOME}/.bin:${PATH}"
+$ curl https://storage.googleapis.com/git-repo-downloads/repo > ~/.bin/repo
+$ chmod a+rx ~/.bin/repo
+```

editor.py

@@ -68,11 +68,14 @@ least one of these before using this command.""", file=sys.stderr)
   def EditString(cls, data):
     """Opens an editor to edit the given content.
 
-       Args:
+    Args:
-         data        : the text to edit
+      data: The text to edit.
 
-      Returns:
+    Returns:
-        new value of edited text; None if editing did not succeed
+      New value of edited text.
+
+    Raises:
+      EditorError: The editor failed to run.
     """
     editor = cls._GetEditor()
     if editor == ':':
@@ -80,7 +83,7 @@ least one of these before using this command.""", file=sys.stderr)
 
     fd, path = tempfile.mkstemp()
     try:
-      os.write(fd, data)
+      os.write(fd, data.encode('utf-8'))
       os.close(fd)
       fd = None
 
@@ -106,11 +109,8 @@ least one of these before using this command.""", file=sys.stderr)
         raise EditorError('editor failed with exit status %d: %s %s'
           % (rc, editor, path))
 
-      fd2 = open(path)
+      with open(path, mode='rb') as fd2:
-      try:
+        return fd2.read().decode('utf-8')
-        return fd2.read()
-      finally:
-        fd2.close()
     finally:
       if fd:
         os.close(fd)

git_config.py

@@ -276,22 +276,16 @@ class GitConfig(object):
       return None
     try:
       Trace(': parsing %s', self.file)
-      fd = open(self._json)
+      with open(self._json) as fd:
-      try:
         return json.load(fd)
-      finally:
-        fd.close()
     except (IOError, ValueError):
       platform_utils.remove(self._json)
       return None
 
   def _SaveJson(self, cache):
     try:
-      fd = open(self._json, 'w')
+      with open(self._json, 'w') as fd:
-      try:
         json.dump(cache, fd, indent=2)
-      finally:
-        fd.close()
     except (IOError, TypeError):
       if os.path.exists(self._json):
         platform_utils.remove(self._json)
@@ -773,15 +767,12 @@ class Branch(object):
       self._Set('merge', self.merge)
 
     else:
-      fd = open(self._config.file, 'a')
+      with open(self._config.file, 'a') as fd:
-      try:
         fd.write('[branch "%s"]\n' % self.name)
         if self.remote:
           fd.write('\tremote = %s\n' % self.remote.name)
         if self.merge:
           fd.write('\tmerge = %s\n' % self.merge)
-      finally:
-        fd.close()
 
   def _Set(self, key, value):
     key = 'branch.%s.%s' % (self.name, key)

git_refs.py

@@ -141,18 +141,11 @@ class GitRefs(object):
 
   def _ReadLoose1(self, path, name):
     try:
-      fd = open(path)
+      with open(path) as fd:
-    except IOError:
-      return
-
-    try:
-      try:
         mtime = os.path.getmtime(path)
         ref_id = fd.readline()
-      except (IOError, OSError):
+    except (IOError, OSError):
-        return
+      return
-    finally:
-      fd.close()
 
     try:
       ref_id = ref_id.decode()

platform_utils.py

@@ -241,14 +241,15 @@ def _makelongpath(path):
     return path
 
 
-def rmtree(path):
+def rmtree(path, ignore_errors=False):
   """shutil.rmtree(path) wrapper with support for long paths on Windows.
 
   Availability: Unix, Windows."""
+  onerror = None
   if isWindows():
-    shutil.rmtree(_makelongpath(path), onerror=handle_rmtree_error)
+    path = _makelongpath(path)
-  else:
+    onerror = handle_rmtree_error
-    shutil.rmtree(path)
+  shutil.rmtree(path, ignore_errors=ignore_errors, onerror=onerror)
 
 
 def handle_rmtree_error(function, path, excinfo):

progress.py

@@ -39,7 +39,7 @@ class Progress(object):
     self._print_newline = print_newline
     self._always_print_percentage = always_print_percentage
 
-  def update(self, inc=1):
+  def update(self, inc=1, msg=''):
     self._done += inc
 
     if _NOT_TTY or IsTrace():
@@ -62,12 +62,13 @@ class Progress(object):
 
       if self._lastp != p or self._always_print_percentage:
         self._lastp = p
-        sys.stderr.write('%s\r%s: %3d%% (%d%s/%d%s)%s' % (
+        sys.stderr.write('%s\r%s: %3d%% (%d%s/%d%s)%s%s%s' % (
           CSI_ERASE_LINE,
           self._title,
           p,
           self._done, self._units,
           self._total, self._units,
+          ' ' if msg else '', msg,
           "\n" if self._print_newline else ""))
         sys.stderr.flush()
 

project.py

@@ -58,11 +58,8 @@ else:
 def _lwrite(path, content):
   lock = '%s.lock' % path
 
-  fd = open(lock, 'w')
+  with open(lock, 'w') as fd:
-  try:
     fd.write(content)
-  finally:
-    fd.close()
 
   try:
     platform_utils.rename(lock, path)
@@ -137,6 +134,7 @@ class DownloadedChange(object):
 
 class ReviewableBranch(object):
   _commit_cache = None
+  _base_exists = None
 
   def __init__(self, project, branch, base):
     self.project = project
@@ -150,14 +148,19 @@ class ReviewableBranch(object):
   @property
   def commits(self):
     if self._commit_cache is None:
-      self._commit_cache = self.project.bare_git.rev_list('--abbrev=8',
+      args = ('--abbrev=8', '--abbrev-commit', '--pretty=oneline', '--reverse',
-                                                          '--abbrev-commit',
+              '--date-order', not_rev(self.base), R_HEADS + self.name, '--')
-                                                          '--pretty=oneline',
+      try:
-                                                          '--reverse',
+        self._commit_cache = self.project.bare_git.rev_list(*args)
-                                                          '--date-order',
+      except GitError:
-                                                          not_rev(self.base),
+        # We weren't able to probe the commits for this branch.  Was it tracking
-                                                          R_HEADS + self.name,
+        # a branch that no longer exists?  If so, return no commits.  Otherwise,
-                                                          '--')
+        # rethrow the error as we don't know what's going on.
+        if self.base_exists:
+          raise
+
+        self._commit_cache = []
+
     return self._commit_cache
 
   @property
@@ -176,6 +179,23 @@ class ReviewableBranch(object):
                                      R_HEADS + self.name,
                                      '--')
 
+  @property
+  def base_exists(self):
+    """Whether the branch we're tracking exists.
+
+    Normally it should, but sometimes branches we track can get deleted.
+    """
+    if self._base_exists is None:
+      try:
+        self.project.bare_git.rev_parse('--verify', not_rev(self.base))
+        # If we're still here, the base branch exists.
+        self._base_exists = True
+      except GitError:
+        # If we failed to verify, the base branch doesn't exist.
+        self._base_exists = False
+
+    return self._base_exists
+
   def UploadForReview(self, people,
                       auto_topic=False,
                       draft=False,
@@ -1393,12 +1413,9 @@ class Project(object):
     if is_new:
       alt = os.path.join(self.gitdir, 'objects/info/alternates')
       try:
-        fd = open(alt)
+        with open(alt) as fd:
-        try:
           # This works for both absolute and relative alternate directories.
           alt_dir = os.path.join(self.objdir, 'objects', fd.readline().rstrip())
-        finally:
-          fd.close()
       except IOError:
         alt_dir = None
     else:
@@ -1505,6 +1522,13 @@ class Project(object):
     """Perform only the local IO portion of the sync process.
        Network access is not required.
     """
+    if not os.path.exists(self.gitdir):
+      syncbuf.fail(self,
+                   'Cannot checkout %s due to missing network sync; Run '
+                   '`repo sync -n %s` first.' %
+                   (self.name, self.name))
+      return
+
     self._InitWorkTree(force_sync=force_sync, submodules=submodules)
     all_refs = self.bare_ref.all
     self.CleanPublishedCache(all_refs)
@@ -1585,7 +1609,16 @@ class Project(object):
       return
 
     upstream_gain = self._revlist(not_rev(HEAD), revid)
-    pub = self.WasPublished(branch.name, all_refs)
+
+    # See if we can perform a fast forward merge.  This can happen if our
+    # branch isn't in the exact same state as we last published.
+    try:
+      self.work_git.merge_base('--is-ancestor', HEAD, revid)
+      # Skip the published logic.
+      pub = False
+    except GitError:
+      pub = self.WasPublished(branch.name, all_refs)
+
     if pub:
       not_merged = self._revlist(not_rev(revid), pub)
       if not_merged:
@@ -2706,41 +2739,45 @@ class Project(object):
           raise
 
   def _InitWorkTree(self, force_sync=False, submodules=False):
-    dotgit = os.path.join(self.worktree, '.git')
+    realdotgit = os.path.join(self.worktree, '.git')
-    init_dotgit = not os.path.exists(dotgit)
+    tmpdotgit = realdotgit + '.tmp'
+    init_dotgit = not os.path.exists(realdotgit)
+    if init_dotgit:
+      dotgit = tmpdotgit
+      platform_utils.rmtree(tmpdotgit, ignore_errors=True)
+      os.makedirs(tmpdotgit)
+      self._ReferenceGitDir(self.gitdir, tmpdotgit, share_refs=True,
+                            copy_all=False)
+    else:
+      dotgit = realdotgit
+
     try:
-      if init_dotgit:
+      self._CheckDirReference(self.gitdir, dotgit, share_refs=True)
-        os.makedirs(dotgit)
+    except GitError as e:
-        self._ReferenceGitDir(self.gitdir, dotgit, share_refs=True,
+      if force_sync and not init_dotgit:
-                              copy_all=False)
+        try:
+          platform_utils.rmtree(dotgit)
+          return self._InitWorkTree(force_sync=False, submodules=submodules)
+        except:
+          raise e
+      raise e
 
-      try:
+    if init_dotgit:
-        self._CheckDirReference(self.gitdir, dotgit, share_refs=True)
+      _lwrite(os.path.join(tmpdotgit, HEAD), '%s\n' % self.GetRevisionId())
-      except GitError as e:
-        if force_sync:
-          try:
-            platform_utils.rmtree(dotgit)
-            return self._InitWorkTree(force_sync=False, submodules=submodules)
-          except:
-            raise e
-        raise e
 
-      if init_dotgit:
+      # Now that the .git dir is fully set up, move it to its final home.
-        _lwrite(os.path.join(dotgit, HEAD), '%s\n' % self.GetRevisionId())
+      platform_utils.rename(tmpdotgit, realdotgit)
 
-        cmd = ['read-tree', '--reset', '-u']
+      # Finish checking out the worktree.
-        cmd.append('-v')
+      cmd = ['read-tree', '--reset', '-u']
-        cmd.append(HEAD)
+      cmd.append('-v')
-        if GitCommand(self, cmd).Wait() != 0:
+      cmd.append(HEAD)
-          raise GitError("cannot initialize work tree for " + self.name)
+      if GitCommand(self, cmd).Wait() != 0:
+        raise GitError('Cannot initialize work tree for ' + self.name)
 
-        if submodules:
+      if submodules:
-          self._SyncSubmodules(quiet=True)
+        self._SyncSubmodules(quiet=True)
-        self._CopyAndLinkFiles()
+      self._CopyAndLinkFiles()
-    except Exception:
-      if init_dotgit:
-        platform_utils.rmtree(dotgit)
-      raise
 
   def _get_symlink_error_message(self):
     if platform_utils.isWindows():
@@ -2889,13 +2926,10 @@ class Project(object):
       else:
         path = os.path.join(self._project.worktree, '.git', HEAD)
       try:
-        fd = open(path)
+        with open(path) as fd:
+          line = fd.readline()
       except IOError as e:
         raise NoManifestException(path, str(e))
-      try:
-        line = fd.readline()
-      finally:
-        fd.close()
       try:
         line = line.decode()
       except AttributeError:

repo

@@ -513,9 +513,8 @@ def SetupGnuPG(quiet):
     sys.exit(1)
   print()
 
-  fd = open(os.path.join(home_dot_repo, 'keyring-version'), 'w')
+  with open(os.path.join(home_dot_repo, 'keyring-version'), 'w') as fd:
-  fd.write('.'.join(map(str, KEYRING_VERSION)) + '\n')
+    fd.write('.'.join(map(str, KEYRING_VERSION)) + '\n')
-  fd.close()
   return True
 
 

subcmds/manifest.py

@@ -40,10 +40,9 @@ in a Git repository for use during future 'repo init' invocations.
     helptext = self._helpDescription + '\n'
     r = os.path.dirname(__file__)
     r = os.path.dirname(r)
-    fd = open(os.path.join(r, 'docs', 'manifest-format.md'))
+    with open(os.path.join(r, 'docs', 'manifest-format.md')) as fd:
-    for line in fd:
+      for line in fd:
-      helptext += line
+        helptext += line
-    fd.close()
     return helptext
 
   def _Options(self, p):

subcmds/prune.py

@@ -51,11 +51,16 @@ class Prune(PagedCommand):
         out.project('project %s/' % project.relpath)
         out.nl()
 
-      commits = branch.commits
+      print('%s %-33s ' % (
-      date = branch.date
-      print('%s %-33s (%2d commit%s, %s)' % (
             branch.name == project.CurrentBranch and '*' or ' ',
-            branch.name,
+            branch.name), end='')
+
+      if not branch.base_exists:
+        print('(ignoring: tracking branch is gone: %s)' % (branch.base,))
+      else:
+        commits = branch.commits
+        date = branch.date
+        print('(%2d commit%s, %s)' % (
             len(commits),
             len(commits) != 1 and 's' or ' ',
             date))

subcmds/sync.py

@@ -315,9 +315,6 @@ later is required to fix a server side protocol bug.
     # We'll set to true once we've locked the lock.
     did_lock = False
 
-    if not opt.quiet:
-      print('Fetching project %s' % project.name)
-
     # Encapsulate everything in a try/except/finally so that:
     # - We always set err_event in the case of an exception.
     # - We always make sure we unlock the lock if we locked it.
@@ -350,7 +347,7 @@ later is required to fix a server side protocol bug.
             raise _FetchError()
 
         fetched.add(project.gitdir)
-        pm.update()
+        pm.update(msg=project.name)
       except _FetchError:
         pass
       except Exception as e:
@@ -371,7 +368,6 @@ later is required to fix a server side protocol bug.
     fetched = set()
     lock = _threading.Lock()
     pm = Progress('Fetching projects', len(projects),
-                  print_newline=not(opt.quiet),
                   always_print_percentage=opt.quiet)
 
     objdir_project_map = dict()
@@ -440,7 +436,7 @@ later is required to fix a server side protocol bug.
     finally:
       sem.release()
 
-  def _CheckoutOne(self, opt, project, lock, pm, err_event):
+  def _CheckoutOne(self, opt, project, lock, pm, err_event, err_results):
     """Checkout work tree for one project
 
     Args:
@@ -452,6 +448,8 @@ later is required to fix a server side protocol bug.
           lock held).
       err_event: We'll set this event in the case of an error (after printing
           out info about the error).
+      err_results: A list of strings, paths to git repos where checkout
+          failed.
 
     Returns:
       Whether the fetch was successful.
@@ -459,9 +457,6 @@ later is required to fix a server side protocol bug.
     # We'll set to true once we've locked the lock.
     did_lock = False
 
-    if not opt.quiet:
-      print('Checking out project %s' % project.name)
-
     # Encapsulate everything in a try/except/finally so that:
     # - We always set err_event in the case of an exception.
     # - We always make sure we unlock the lock if we locked it.
@@ -472,11 +467,11 @@ later is required to fix a server side protocol bug.
     try:
       try:
         project.Sync_LocalHalf(syncbuf, force_sync=opt.force_sync)
-        success = syncbuf.Finish()
 
         # Lock around all the rest of the code, since printing, updating a set
         # and Progress.update() are not thread safe.
         lock.acquire()
+        success = syncbuf.Finish()
         did_lock = True
 
         if not success:
@@ -485,7 +480,7 @@ later is required to fix a server side protocol bug.
                 file=sys.stderr)
           raise _CheckoutError()
 
-        pm.update()
+        pm.update(msg=project.name)
       except _CheckoutError:
         pass
       except Exception as e:
@@ -496,6 +491,8 @@ later is required to fix a server side protocol bug.
         raise
     finally:
       if did_lock:
+        if not success:
+          err_results.append(project.relpath)
         lock.release()
       finish = time.time()
       self.event_log.AddSync(project, event_log.TASK_SYNC_LOCAL,
@@ -523,11 +520,12 @@ later is required to fix a server side protocol bug.
       syncjobs = 1
 
     lock = _threading.Lock()
-    pm = Progress('Syncing work tree', len(all_projects))
+    pm = Progress('Checking out projects', len(all_projects))
 
     threads = set()
     sem = _threading.Semaphore(syncjobs)
     err_event = _threading.Event()
+    err_results = []
 
     for project in all_projects:
       # Check for any errors before running any more tasks.
@@ -542,7 +540,8 @@ later is required to fix a server side protocol bug.
                       project=project,
                       lock=lock,
                       pm=pm,
-                      err_event=err_event)
+                      err_event=err_event,
+                      err_results=err_results)
         if syncjobs > 1:
           t = _threading.Thread(target=self._CheckoutWorker,
                                 kwargs=kwargs)
@@ -560,6 +559,9 @@ later is required to fix a server side protocol bug.
     # If we saw an error, exit with code 1 so that other scripts can check.
     if err_event.isSet():
       print('\nerror: Exited sync due to checkout errors', file=sys.stderr)
+      if err_results:
+        print('Failing repos:\n%s' % '\n'.join(err_results),
+              file=sys.stderr)
       sys.exit(1)
 
   def _GCProjects(self, projects):
@@ -692,11 +694,8 @@ later is required to fix a server side protocol bug.
     old_project_paths = []
 
     if os.path.exists(file_path):
-      fd = open(file_path, 'r')
+      with open(file_path, 'r') as fd:
-      try:
         old_project_paths = fd.read().split('\n')
-      finally:
-        fd.close()
       # In reversed order, so subfolders are deleted before parent folder.
       for path in sorted(old_project_paths, reverse=True):
         if not path:
@@ -731,12 +730,9 @@ later is required to fix a server side protocol bug.
               return 1
 
     new_project_paths.sort()
-    fd = open(file_path, 'w')
+    with open(file_path, 'w') as fd:
-    try:
       fd.write('\n'.join(new_project_paths))
       fd.write('\n')
-    finally:
-      fd.close()
     return 0
 
   def _SmartSyncSetup(self, opt, smart_sync_manifest_path):
@@ -809,11 +805,8 @@ later is required to fix a server side protocol bug.
       if success:
         manifest_name = os.path.basename(smart_sync_manifest_path)
         try:
-          f = open(smart_sync_manifest_path, 'w')
+          with open(smart_sync_manifest_path, 'w') as f:
-          try:
             f.write(manifest_str)
-          finally:
-            f.close()
         except IOError as e:
           print('error: cannot write manifest to %s:\n%s'
                 % (smart_sync_manifest_path, e),
@@ -1102,11 +1095,8 @@ class _FetchTimes(object):
   def _Load(self):
     if self._times is None:
       try:
-        f = open(self._path)
+        with open(self._path) as f:
-        try:
           self._times = json.load(f)
-        finally:
-          f.close()
       except (IOError, ValueError):
         try:
           platform_utils.remove(self._path)
@@ -1126,11 +1116,8 @@ class _FetchTimes(object):
       del self._times[name]
 
     try:
-      f = open(self._path, 'w')
+      with open(self._path, 'w') as f:
-      try:
         json.dump(self._times, f, indent=2)
-      finally:
-        f.close()
     except (IOError, TypeError):
       try:
         platform_utils.remove(self._path)

subcmds/upload.py

@@ -271,11 +271,6 @@ Gerrit Code Review:  https://www.gerritcodereview.com/
       branches[project.name] = b
     script.append('')
 
-    script = [ x.encode('utf-8')
-             if issubclass(type(x), unicode)
-             else x
-             for x in script ]
-
     script = Editor.EditString("\n".join(script)).split("\n")
 
     project_re = re.compile(r'^#?\s*project\s*([^\s]+)/:$')

tests/test_editor.py

@@ -0,0 +1,60 @@
+# -*- coding:utf-8 -*-
+#
+# Copyright (C) 2019 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Unittests for the editor.py module."""
+
+from __future__ import print_function
+
+import unittest
+
+from editor import Editor
+
+
+class EditorTestCase(unittest.TestCase):
+  """Take care of resetting Editor state across tests."""
+
+  def setUp(self):
+    self.setEditor(None)
+
+  def tearDown(self):
+    self.setEditor(None)
+
+  @staticmethod
+  def setEditor(editor):
+    Editor._editor = editor
+
+
+class GetEditor(EditorTestCase):
+  """Check GetEditor behavior."""
+
+  def test_basic(self):
+    """Basic checking of _GetEditor."""
+    self.setEditor(':')
+    self.assertEqual(':', Editor._GetEditor())
+
+
+class EditString(EditorTestCase):
+  """Check EditString behavior."""
+
+  def test_no_editor(self):
+    """Check behavior when no editor is available."""
+    self.setEditor(':')
+    self.assertEqual('foo', Editor.EditString('foo'))
+
+  def test_cat_editor(self):
+    """Check behavior when editor is `cat`."""
+    self.setEditor('cat')
+    self.assertEqual('foo', Editor.EditString('foo'))

tests/test_project.py

@@ -18,11 +18,30 @@
 
 from __future__ import print_function
 
+import contextlib
+import os
+import shutil
+import subprocess
+import tempfile
 import unittest
 
+import git_config
 import project
 
 
+@contextlib.contextmanager
+def TempGitTree():
+  """Create a new empty git checkout for testing."""
+  # TODO(vapier): Convert this to tempfile.TemporaryDirectory once we drop
+  # Python 2 support entirely.
+  try:
+    tempdir = tempfile.mkdtemp(prefix='repo-tests')
+    subprocess.check_call(['git', 'init'], cwd=tempdir)
+    yield tempdir
+  finally:
+    shutil.rmtree(tempdir)
+
+
 class RepoHookShebang(unittest.TestCase):
   """Check shebang parsing in RepoHook."""
 
@@ -60,3 +79,58 @@ class RepoHookShebang(unittest.TestCase):
     for shebang, interp in DATA:
       self.assertEqual(project.RepoHook._ExtractInterpFromShebang(shebang),
                        interp)
+
+
+class FakeProject(object):
+  """A fake for Project for basic functionality."""
+
+  def __init__(self, worktree):
+    self.worktree = worktree
+    self.gitdir = os.path.join(worktree, '.git')
+    self.name = 'fakeproject'
+    self.work_git = project.Project._GitGetByExec(
+        self, bare=False, gitdir=self.gitdir)
+    self.bare_git = project.Project._GitGetByExec(
+        self, bare=True, gitdir=self.gitdir)
+    self.config = git_config.GitConfig.ForRepository(gitdir=self.gitdir)
+
+
+class ReviewableBranchTests(unittest.TestCase):
+  """Check ReviewableBranch behavior."""
+
+  def test_smoke(self):
+    """A quick run through everything."""
+    with TempGitTree() as tempdir:
+      fakeproj = FakeProject(tempdir)
+
+      # Generate some commits.
+      with open(os.path.join(tempdir, 'readme'), 'w') as fp:
+        fp.write('txt')
+      fakeproj.work_git.add('readme')
+      fakeproj.work_git.commit('-mAdd file')
+      fakeproj.work_git.checkout('-b', 'work')
+      fakeproj.work_git.rm('-f', 'readme')
+      fakeproj.work_git.commit('-mDel file')
+
+      # Start off with the normal details.
+      rb = project.ReviewableBranch(
+          fakeproj, fakeproj.config.GetBranch('work'), 'master')
+      self.assertEqual('work', rb.name)
+      self.assertEqual(1, len(rb.commits))
+      self.assertIn('Del file', rb.commits[0])
+      d = rb.unabbrev_commits
+      self.assertEqual(1, len(d))
+      short, long = next(iter(d.items()))
+      self.assertTrue(long.startswith(short))
+      self.assertTrue(rb.base_exists)
+      # Hard to assert anything useful about this.
+      self.assertTrue(rb.date)
+
+      # Now delete the tracking branch!
+      fakeproj.work_git.branch('-D', 'master')
+      rb = project.ReviewableBranch(
+          fakeproj, fakeproj.config.GetBranch('work'), 'master')
+      self.assertEqual(0, len(rb.commits))
+      self.assertFalse(rb.base_exists)
+      # Hard to assert anything useful about this.
+      self.assertTrue(rb.date)