diff --git a/.mailmap b/.mailmap
new file mode 100644
index 0000000..f070b49
--- /dev/null
+++ b/.mailmap
@@ -0,0 +1,8 @@
+Anthony Newnam <anthony.newnam@garmin.com>    Anthony <anthony@bnovc.com>
+Shawn Pearce <sop@google.com>                 Shawn O. Pearce <sop@google.com>
+Jia Bi <bijia@xiaomi.com>                     bijia <bijia@xiaomi.com>
+JoonCheol Park <jooncheol@gmail.com>          Jooncheol Park <jooncheol@gmail.com>
+Sergii Pylypenko <x.pelya.x@gmail.com>        pelya <x.pelya.x@gmail.com>
+Ulrik Sjölin <ulrik.sjolin@sonyericsson.com>  Ulrik Sjolin <ulrik.sjolin@gmail.com>
+Ulrik Sjölin <ulrik.sjolin@sonyericsson.com>  Ulrik Sjolin <ulrik.sjolin@sonyericsson.com>
+Ulrik Sjölin <ulrik.sjolin@sonyericsson.com>  Ulrik Sjölin <ulrik.sjolin@sonyericsson.com>
diff --git a/.pylintrc b/.pylintrc
index c6be743..413d66a 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -53,7 +53,7 @@
 enable=RP0004
 
 # Disable the message(s) with the given id(s).
-disable=R0903,R0912,R0913,R0914,R0915,W0141,C0111,C0103,W0603,W0703,R0911,C0301,C0302,R0902,R0904,W0142,W0212,E1101,E1103,R0201,W0201,W0122,W0232,RP0001,RP0003,RP0101,RP0002,RP0401,RP0701,RP0801,F0401,E0611,R0801,I0011
+disable=C0326,R0903,R0912,R0913,R0914,R0915,W0141,C0111,C0103,W0603,W0703,R0911,C0301,C0302,R0902,R0904,W0142,W0212,E1101,E1103,R0201,W0201,W0122,W0232,RP0001,RP0003,RP0101,RP0002,RP0401,RP0701,RP0801,F0401,E0611,R0801,I0011
 
 [REPORTS]
 
diff --git a/command.py b/command.py
index cd5e3c3..bc2f950 100644
--- a/command.py
+++ b/command.py
@@ -31,7 +31,7 @@
   manifest = None
   _optparse = None
 
-  def WantPager(self, opt):
+  def WantPager(self, _opt):
     return False
 
   def ReadEnvironmentOptions(self, opts):
@@ -63,7 +63,7 @@
         usage = self.helpUsage.strip().replace('%prog', me)
       except AttributeError:
         usage = 'repo %s' % self.NAME
-      self._optparse = optparse.OptionParser(usage = usage)
+      self._optparse = optparse.OptionParser(usage=usage)
       self._Options(self._optparse)
     return self._optparse
 
@@ -110,9 +110,9 @@
     project = None
     if os.path.exists(path):
       oldpath = None
-      while path \
-        and path != oldpath \
-        and path != manifest.topdir:
+      while path and \
+            path != oldpath and \
+            path != manifest.topdir:
         try:
           project = self._by_path[path]
           break
@@ -138,7 +138,7 @@
     mp = manifest.manifestProject
 
     if not groups:
-        groups = mp.config.GetString('manifest.groups')
+      groups = mp.config.GetString('manifest.groups')
     if not groups:
       groups = 'default,platform-' + platform.system().lower()
     groups = [x for x in re.split(r'[,\s]+', groups) if x]
@@ -151,8 +151,7 @@
                                   for p in project.GetDerivedSubprojects())
       all_projects_list.extend(derived_projects.values())
       for project in all_projects_list:
-        if ((missing_ok or project.Exists) and
-            project.MatchesGroups(groups)):
+        if (missing_ok or project.Exists) and project.MatchesGroups(groups):
           result.append(project)
     else:
       self._ResetPathToProjectMap(all_projects_list)
@@ -166,8 +165,8 @@
 
           # If it's not a derived project, update path->project mapping and
           # search again, as arg might actually point to a derived subproject.
-          if (project and not project.Derived and
-              (submodules_ok or project.sync_s)):
+          if (project and not project.Derived and (submodules_ok or
+                                                   project.sync_s)):
             search_again = False
             for subproject in project.GetDerivedSubprojects():
               self._UpdatePathToProjectMap(subproject)
@@ -194,17 +193,24 @@
     result.sort(key=_getpath)
     return result
 
-  def FindProjects(self, args):
+  def FindProjects(self, args, inverse=False):
     result = []
     patterns = [re.compile(r'%s' % a, re.IGNORECASE) for a in args]
     for project in self.GetProjects(''):
       for pattern in patterns:
-        if pattern.search(project.name) or pattern.search(project.relpath):
+        match = pattern.search(project.name) or pattern.search(project.relpath)
+        if not inverse and match:
           result.append(project)
           break
+        if inverse and match:
+          break
+      else:
+        if inverse:
+          result.append(project)
     result.sort(key=lambda project: project.relpath)
     return result
 
+
 # pylint: disable=W0223
 # Pylint warns that the `InteractiveCommand` and `PagedCommand` classes do not
 # override method `Execute` which is abstract in `Command`.  Since that method
@@ -214,28 +220,32 @@
   """Command which requires user interaction on the tty and
      must not run within a pager, even if the user asks to.
   """
-  def WantPager(self, opt):
+  def WantPager(self, _opt):
     return False
 
+
 class PagedCommand(Command):
   """Command which defaults to output in a pager, as its
      display tends to be larger than one screen full.
   """
-  def WantPager(self, opt):
+  def WantPager(self, _opt):
     return True
 
 # pylint: enable=W0223
 
+
 class MirrorSafeCommand(object):
   """Command permits itself to run within a mirror,
      and does not require a working directory.
   """
 
+
 class GitcAvailableCommand(object):
   """Command that requires GITC to be available, but does
      not require the local client to be a GITC client.
   """
 
+
 class GitcClientCommand(object):
   """Command that requires the local client to be a GITC
      client.
diff --git a/docs/manifest-format.txt b/docs/manifest-format.txt
index 140a782..8fd9137 100644
--- a/docs/manifest-format.txt
+++ b/docs/manifest-format.txt
@@ -175,7 +175,8 @@
   GetApprovedManifest(branch, target)
 
 Return a manifest in which each project is pegged to a known good revision
-for the current branch and target.
+for the current branch and target. This is used by repo sync when the
+--smart-sync option is given.
 
 The target to use is defined by environment variables TARGET_PRODUCT
 and TARGET_BUILD_VARIANT. These variables are used to create a string
@@ -187,7 +188,8 @@
   GetManifest(tag)
 
 Return a manifest in which each project is pegged to the revision at
-the specified tag.
+the specified tag. This is used by repo sync when the --smart-tag option
+is given.
 
 
 Element project
diff --git a/gitc_utils.py b/gitc_utils.py
index 0f3e181..a388dc2 100644
--- a/gitc_utils.py
+++ b/gitc_utils.py
@@ -127,7 +127,7 @@
         repo_proj.revisionExpr = None
 
   # Convert URLs from relative to absolute.
-  for name, remote in manifest.remotes.iteritems():
+  for _name, remote in manifest.remotes.iteritems():
     remote.fetchUrl = remote.resolvedFetchUrl
 
   # Save the manifest.
diff --git a/hooks/commit-msg b/hooks/commit-msg
index d8f009b..40ac237 100755
--- a/hooks/commit-msg
+++ b/hooks/commit-msg
@@ -1,6 +1,7 @@
 #!/bin/sh
+# From Gerrit Code Review 2.12.1
 #
-# Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
+# Part of Gerrit Code Review (https://www.gerritcodereview.com/)
 #
 # Copyright (C) 2009 The Android Open Source Project
 #
@@ -19,7 +20,7 @@
 
 unset GREP_OPTIONS
 
-CHANGE_ID_AFTER="Bug|Issue"
+CHANGE_ID_AFTER="Bug|Issue|Test"
 MSG="$1"
 
 # Check for, and add if missing, a unique Change-Id
@@ -38,6 +39,12 @@
 		return
 	fi
 
+	# Do not add Change-Id to temp commits
+	if echo "$clean_message" | head -1 | grep -q '^\(fixup\|squash\)!'
+	then
+		return
+	fi
+
 	if test "false" = "`git config --bool --get gerrit.createChangeId`"
 	then
 		return
@@ -57,6 +64,10 @@
 		AWK=/usr/xpg4/bin/awk
 	fi
 
+	# Get core.commentChar from git config or use default symbol
+	commentChar=`git config --get core.commentChar`
+	commentChar=${commentChar:-#}
+
 	# How this works:
 	# - parse the commit message as (textLine+ blankLine*)*
 	# - assume textLine+ to be a footer until proven otherwise
@@ -75,8 +86,8 @@
 		blankLines = 0
 	}
 
-	# Skip lines starting with "#" without any spaces before it.
-	/^#/ { next }
+	# Skip lines starting with commentChar without any spaces before it.
+	/^'"$commentChar"'/ { next }
 
 	# Skip the line starting with the diff command and everything after it,
 	# up to the end of the file, assuming it is only patch data.
diff --git a/main.py b/main.py
index 4f4eb9f..c5f1e9c 100755
--- a/main.py
+++ b/main.py
@@ -379,7 +379,7 @@
     self.context = None
     self.handler_order = urllib.request.BaseHandler.handler_order - 50
 
-  def http_error_401(self, req, fp, code, msg, headers):
+  def http_error_401(self, req, fp, code, msg, headers): # pylint:disable=unused-argument
     host = req.get_host()
     retry = self.http_error_auth_reqed('www-authenticate', host, req, headers)
     return retry
diff --git a/manifest_xml.py b/manifest_xml.py
index 3ac607e..295493d 100644
--- a/manifest_xml.py
+++ b/manifest_xml.py
@@ -102,7 +102,10 @@
     remoteName = self.name
     if self.remoteAlias:
       remoteName = self.remoteAlias
-    return RemoteSpec(remoteName, url, self.reviewUrl)
+    return RemoteSpec(remoteName,
+                      url=url,
+                      review=self.reviewUrl,
+                      orig_name=self.name)
 
 class XmlManifest(object):
   """manages the repo configuration file"""
@@ -249,9 +252,9 @@
         e.setAttribute('path', relpath)
       remoteName = None
       if d.remote:
-        remoteName = d.remote.remoteAlias or d.remote.name
-      if not d.remote or p.remote.name != remoteName:
-        remoteName = p.remote.name
+        remoteName = d.remote.name
+      if not d.remote or p.remote.orig_name != remoteName:
+        remoteName = p.remote.orig_name
         e.setAttribute('remote', remoteName)
       if peg_rev:
         if self.IsMirror:
@@ -267,7 +270,7 @@
             # isn't our value
             e.setAttribute('upstream', p.revisionExpr)
       else:
-        revision = self.remotes[remoteName].revision or d.revisionExpr
+        revision = self.remotes[p.remote.orig_name].revision or d.revisionExpr
         if not revision or revision != p.revisionExpr:
           e.setAttribute('revision', p.revisionExpr)
         if p.upstream and p.upstream != p.revisionExpr:
@@ -969,5 +972,5 @@
   def _output_manifest_project_extras(self, p, e):
     """Output GITC Specific Project attributes"""
     if p.old_revision:
-        e.setAttribute('old-revision', str(p.old_revision))
+      e.setAttribute('old-revision', str(p.old_revision))
 
diff --git a/project.py b/project.py
index 6dfb31c..c91085c 100644
--- a/project.py
+++ b/project.py
@@ -30,7 +30,8 @@
 
 from color import Coloring
 from git_command import GitCommand, git_require
-from git_config import GitConfig, IsId, GetSchemeFromUrl, GetUrlCookieFile, ID_RE
+from git_config import GitConfig, IsId, GetSchemeFromUrl, GetUrlCookieFile, \
+    ID_RE
 from error import GitError, HookError, UploadError, DownloadError
 from error import ManifestInvalidRevisionError
 from error import NoManifestException
@@ -44,6 +45,7 @@
   input = raw_input
   # pylint:enable=W0622
 
+
 def _lwrite(path, content):
   lock = '%s.lock' % path
 
@@ -59,21 +61,27 @@
     os.remove(lock)
     raise
 
+
 def _error(fmt, *args):
   msg = fmt % args
   print('error: %s' % msg, file=sys.stderr)
 
+
 def _warn(fmt, *args):
   msg = fmt % args
   print('warn: %s' % msg, file=sys.stderr)
 
+
 def not_rev(r):
   return '^' + r
 
+
 def sq(r):
   return "'" + r.replace("'", "'\''") + "'"
 
 _project_hook_list = None
+
+
 def _ProjectHooks():
   """List the hooks present in the 'hooks' directory.
 
@@ -107,15 +115,14 @@
   @property
   def commits(self):
     if self._commit_cache is None:
-      self._commit_cache = self.project.bare_git.rev_list(
-        '--abbrev=8',
-        '--abbrev-commit',
-        '--pretty=oneline',
-        '--reverse',
-        '--date-order',
-        not_rev(self.base),
-        self.commit,
-        '--')
+      self._commit_cache = self.project.bare_git.rev_list('--abbrev=8',
+                                                          '--abbrev-commit',
+                                                          '--pretty=oneline',
+                                                          '--reverse',
+                                                          '--date-order',
+                                                          not_rev(self.base),
+                                                          self.commit,
+                                                          '--')
     return self._commit_cache
 
 
@@ -134,36 +141,36 @@
   @property
   def commits(self):
     if self._commit_cache is None:
-      self._commit_cache = self.project.bare_git.rev_list(
-        '--abbrev=8',
-        '--abbrev-commit',
-        '--pretty=oneline',
-        '--reverse',
-        '--date-order',
-        not_rev(self.base),
-        R_HEADS + self.name,
-        '--')
+      self._commit_cache = self.project.bare_git.rev_list('--abbrev=8',
+                                                          '--abbrev-commit',
+                                                          '--pretty=oneline',
+                                                          '--reverse',
+                                                          '--date-order',
+                                                          not_rev(self.base),
+                                                          R_HEADS + self.name,
+                                                          '--')
     return self._commit_cache
 
   @property
   def unabbrev_commits(self):
     r = dict()
-    for commit in self.project.bare_git.rev_list(
-        not_rev(self.base),
-        R_HEADS + self.name,
-        '--'):
+    for commit in self.project.bare_git.rev_list(not_rev(self.base),
+                                                 R_HEADS + self.name,
+                                                 '--'):
       r[commit[0:8]] = commit
     return r
 
   @property
   def date(self):
-    return self.project.bare_git.log(
-      '--pretty=format:%cd',
-      '-n', '1',
-      R_HEADS + self.name,
-      '--')
+    return self.project.bare_git.log('--pretty=format:%cd',
+                                     '-n', '1',
+                                     R_HEADS + self.name,
+                                     '--')
 
-  def UploadForReview(self, people, auto_topic=False, draft=False, dest_branch=None):
+  def UploadForReview(self, people,
+                      auto_topic=False,
+                      draft=False,
+                      dest_branch=None):
     self.project.UploadForReview(self.name,
                                  people,
                                  auto_topic=auto_topic,
@@ -173,8 +180,8 @@
   def GetPublishedRefs(self):
     refs = {}
     output = self.project.bare_git.ls_remote(
-      self.branch.remote.SshReviewUrl(self.project.UserEmail),
-      'refs/changes/*')
+        self.branch.remote.SshReviewUrl(self.project.UserEmail),
+        'refs/changes/*')
     for line in output.split('\n'):
       try:
         (sha, ref) = line.split()
@@ -184,7 +191,9 @@
 
     return refs
 
+
 class StatusColoring(Coloring):
+
   def __init__(self, config):
     Coloring.__init__(self, config, 'status')
     self.project = self.printer('header', attr='bold')
@@ -198,17 +207,22 @@
 
 
 class DiffColoring(Coloring):
+
   def __init__(self, config):
     Coloring.__init__(self, config, 'diff')
     self.project = self.printer('header', attr='bold')
 
+
 class _Annotation(object):
+
   def __init__(self, name, value, keep):
     self.name = name
     self.value = value
     self.keep = keep
 
+
 class _CopyFile(object):
+
   def __init__(self, src, dest, abssrc, absdest):
     self.src = src
     self.dest = dest
@@ -236,7 +250,9 @@
       except IOError:
         _error('Cannot copy file %s to %s', src, dest)
 
+
 class _LinkFile(object):
+
   def __init__(self, git_worktree, src, dest, relsrc, absdest):
     self.git_worktree = git_worktree
     self.src = src
@@ -275,7 +291,7 @@
       absDestDir = self.abs_dest
       if os.path.exists(absDestDir) and not os.path.isdir(absDestDir):
         _error('Link error: src with wildcard, %s must be a directory',
-            absDestDir)
+               absDestDir)
       else:
         absSrcFiles = glob.glob(absSrc)
         for absSrcFile in absSrcFiles:
@@ -292,18 +308,24 @@
           relSrc = os.path.join(relSrcDir, srcFile)
           self.__linkIt(relSrc, absDest)
 
+
 class RemoteSpec(object):
+
   def __init__(self,
                name,
                url=None,
                review=None,
-               revision=None):
+               revision=None,
+               orig_name=None):
     self.name = name
     self.url = url
     self.review = review
     self.revision = revision
+    self.orig_name = orig_name
+
 
 class RepoHook(object):
+
   """A RepoHook contains information about a script to run as a hook.
 
   Hooks are used to run a python script before running an upload (for instance,
@@ -316,6 +338,7 @@
   Hooks are always python.  When a hook is run, we will load the hook into the
   interpreter and execute its main() function.
   """
+
   def __init__(self,
                hook_type,
                hooks_project,
@@ -430,8 +453,8 @@
                  '  %s\n'
                  '\n'
                  'Do you want to allow this script to run '
-                 '(yes/yes-never-ask-again/NO)? ') % (
-                 self._GetMustVerb(), self._script_fullpath)
+                 '(yes/yes-never-ask-again/NO)? ') % (self._GetMustVerb(),
+                                                      self._script_fullpath)
       response = input(prompt).lower()
       print()
 
@@ -475,19 +498,18 @@
 
       # Exec, storing global context in the context dict.  We catch exceptions
       # and  convert to a HookError w/ just the failing traceback.
-      context = {}
+      context = {'__file__': self._script_fullpath}
       try:
         exec(compile(open(self._script_fullpath).read(),
                      self._script_fullpath, 'exec'), context)
       except Exception:
-        raise HookError('%s\nFailed to import %s hook; see traceback above.' % (
-                        traceback.format_exc(), self._hook_type))
+        raise HookError('%s\nFailed to import %s hook; see traceback above.' %
+                        (traceback.format_exc(), self._hook_type))
 
       # Running the script should have defined a main() function.
       if 'main' not in context:
         raise HookError('Missing main() in: "%s"' % self._script_fullpath)
 
-
       # Add 'hook_should_take_kwargs' to the arguments to be passed to main.
       # We don't actually want hooks to define their main with this argument--
       # it's there to remind them that their hook should always take **kwargs.
@@ -505,8 +527,8 @@
         context['main'](**kwargs)
       except Exception:
         raise HookError('%s\nFailed to run main() for %s hook; see traceback '
-                        'above.' % (
-                        traceback.format_exc(), self._hook_type))
+                        'above.' % (traceback.format_exc(),
+                                    self._hook_type))
     finally:
       # Restore sys.path and CWD.
       sys.path = orig_syspath
@@ -530,8 +552,8 @@
           to run a required hook (from _CheckForHookApproval).
     """
     # No-op if there is no hooks project or if hook is disabled.
-    if ((not self._hooks_project) or
-        (self._hook_type not in self._hooks_project.enabled_repo_hooks)):
+    if ((not self._hooks_project) or (self._hook_type not in
+                                      self._hooks_project.enabled_repo_hooks)):
       return
 
     # Bail with a nice error if we can't find the hook.
@@ -553,6 +575,7 @@
   # These objects can only be used by a single working tree.
   working_tree_files = ['config', 'packed-refs', 'shallow']
   working_tree_dirs = ['logs', 'refs']
+
   def __init__(self,
                manifest,
                name,
@@ -611,9 +634,9 @@
     self.relpath = relpath
     self.revisionExpr = revisionExpr
 
-    if   revisionId is None \
-     and revisionExpr \
-     and IsId(revisionExpr):
+    if revisionId is None \
+            and revisionExpr \
+            and IsId(revisionExpr):
       self.revisionId = revisionExpr
     else:
       self.revisionId = revisionId
@@ -633,9 +656,8 @@
     self.copyfiles = []
     self.linkfiles = []
     self.annotations = []
-    self.config = GitConfig.ForRepository(
-                    gitdir=self.gitdir,
-                    defaults=self.manifest.globalConfig)
+    self.config = GitConfig.ForRepository(gitdir=self.gitdir,
+                                          defaults=self.manifest.globalConfig)
 
     if self.worktree:
       self.work_git = self._GitGetByExec(self, bare=False, gitdir=gitdir)
@@ -773,7 +795,7 @@
     """
     expanded_manifest_groups = manifest_groups or ['default']
     expanded_project_groups = ['all'] + (self.groups or [])
-    if not 'notdefault' in expanded_project_groups:
+    if 'notdefault' not in expanded_project_groups:
       expanded_project_groups += ['default']
 
     matched = False
@@ -785,7 +807,7 @@
 
     return matched
 
-## Status Display ##
+# Status Display ##
   def UncommitedFiles(self, get_all=True):
     """Returns a list of strings, uncommitted files in the git tree.
 
@@ -837,7 +859,7 @@
       output: If specified, redirect the output to this object.
     """
     if not os.path.isdir(self.worktree):
-      if output_redir == None:
+      if output_redir is None:
         output_redir = sys.stdout
       print(file=output_redir)
       print('project %s/' % self.relpath, file=output_redir)
@@ -856,7 +878,7 @@
       return 'CLEAN'
 
     out = StatusColoring(self.config)
-    if not output_redir == None:
+    if output_redir is not None:
       out.redirect(output_redir)
     out.project('project %-40s', self.relpath + '/ ')
 
@@ -899,7 +921,7 @@
 
       if i and i.src_path:
         line = ' %s%s\t%s => %s (%s%%)' % (i_status, f_status,
-                                        i.src_path, p, i.level)
+                                           i.src_path, p, i.level)
       else:
         line = ' %s%s\t%s' % (i_status, f_status, p)
 
@@ -942,7 +964,7 @@
     p.Wait()
 
 
-## Publish / Upload ##
+# Publish / Upload ##
 
   def WasPublished(self, branch, all_refs=None):
     """Was the branch published (uploaded) for code review?
@@ -1085,7 +1107,7 @@
                             message=msg)
 
 
-## Sync ##
+# Sync ##
 
   def _ExtractArchive(self, tarpath, path=None):
     """Extract the given tar on its current location
@@ -1103,15 +1125,15 @@
     return False
 
   def Sync_NetworkHalf(self,
-      quiet=False,
-      is_new=None,
-      current_branch_only=False,
-      force_sync=False,
-      clone_bundle=True,
-      no_tags=False,
-      archive=False,
-      optimized_fetch=False,
-      prune=False):
+                       quiet=False,
+                       is_new=None,
+                       current_branch_only=False,
+                       force_sync=False,
+                       clone_bundle=True,
+                       no_tags=False,
+                       archive=False,
+                       optimized_fetch=False,
+                       prune=False):
     """Perform only the network IO portion of the sync process.
        Local working directory/branch state is not affected.
     """
@@ -1164,8 +1186,8 @@
       alt_dir = None
 
     if clone_bundle \
-    and alt_dir is None \
-    and self._ApplyCloneBundle(initial=is_new, quiet=quiet):
+            and alt_dir is None \
+            and self._ApplyCloneBundle(initial=is_new, quiet=quiet):
       is_new = False
 
     if not current_branch_only:
@@ -1177,12 +1199,13 @@
       elif self.manifest.default.sync_c:
         current_branch_only = True
 
-    need_to_fetch = not (optimized_fetch and \
-      (ID_RE.match(self.revisionExpr) and self._CheckForSha1()))
-    if (need_to_fetch
-        and not self._RemoteFetch(initial=is_new, quiet=quiet, alt_dir=alt_dir,
-                                  current_branch_only=current_branch_only,
-                                  no_tags=no_tags, prune=prune)):
+    need_to_fetch = not (optimized_fetch and
+                         (ID_RE.match(self.revisionExpr) and
+                          self._CheckForSha1()))
+    if (need_to_fetch and
+        not self._RemoteFetch(initial=is_new, quiet=quiet, alt_dir=alt_dir,
+                              current_branch_only=current_branch_only,
+                              no_tags=no_tags, prune=prune)):
       return False
 
     if self.worktree:
@@ -1219,9 +1242,8 @@
     try:
       return self.bare_git.rev_list(self.revisionExpr, '-1')[0]
     except GitError:
-      raise ManifestInvalidRevisionError(
-        'revision %s in %s not found' % (self.revisionExpr,
-                                         self.name))
+      raise ManifestInvalidRevisionError('revision %s in %s not found' %
+                                         (self.revisionExpr, self.name))
 
   def GetRevisionId(self, all_refs=None):
     if self.revisionId:
@@ -1236,9 +1258,8 @@
     try:
       return self.bare_git.rev_parse('--verify', '%s^0' % rev)
     except GitError:
-      raise ManifestInvalidRevisionError(
-        'revision %s in %s not found' % (self.revisionExpr,
-                                         self.name))
+      raise ManifestInvalidRevisionError('revision %s in %s not found' %
+                                         (self.revisionExpr, self.name))
 
   def Sync_LocalHalf(self, syncbuf, force_sync=False):
     """Perform only the local IO portion of the sync process.
@@ -1327,8 +1348,8 @@
           # to rewrite the published commits so we punt.
           #
           syncbuf.fail(self,
-                       "branch %s is published (but not merged) and is now %d commits behind"
-                       % (branch.name, len(upstream_gain)))
+                       "branch %s is published (but not merged) and is now "
+                       "%d commits behind" % (branch.name, len(upstream_gain)))
         return
       elif pub == head:
         # All published commits are merged, and thus we are a
@@ -1422,7 +1443,7 @@
     remote = self.GetRemote(self.remote.name)
 
     cmd = ['fetch', remote.name]
-    cmd.append('refs/changes/%2.2d/%d/%d' \
+    cmd.append('refs/changes/%2.2d/%d/%d'
                % (change_id % 100, change_id, patch_id))
     if GitCommand(self, cmd, bare=True).Wait() != 0:
       return None
@@ -1433,7 +1454,7 @@
                             self.bare_git.rev_parse('FETCH_HEAD'))
 
 
-## Branch Management ##
+# Branch Management ##
 
   def StartBranch(self, name, branch_merge=''):
     """Create a new branch off the manifest's revision.
@@ -1620,10 +1641,11 @@
     return kept
 
 
-## Submodule Management ##
+# Submodule Management ##
 
   def GetRegisteredSubprojects(self):
     result = []
+
     def rec(subprojects):
       if not subprojects:
         return
@@ -1658,6 +1680,7 @@
 
     re_path = re.compile(r'^submodule\.([^.]+)\.path=(.*)$')
     re_url = re.compile(r'^submodule\.([^.]+)\.url=(.*)$')
+
     def parse_gitmodules(gitdir, rev):
       cmd = ['cat-file', 'blob', '%s:.gitmodules' % rev]
       try:
@@ -1767,7 +1790,7 @@
     return result
 
 
-## Direct Git Commands ##
+# Direct Git Commands ##
   def _CheckForSha1(self):
     try:
       # if revision (sha or tag) is not present then following function
@@ -1791,7 +1814,6 @@
     if command.Wait() != 0:
       raise GitError('git archive %s: %s' % (self.name, command.stderr))
 
-
   def _RemoteFetch(self, name=None,
                    current_branch_only=False,
                    initial=False,
@@ -1958,9 +1980,9 @@
           break
         continue
       elif current_branch_only and is_sha1 and ret == 128:
-        # Exit code 128 means "couldn't find the ref you asked for"; if we're in sha1
-        # mode, we just tried sync'ing from the upstream field; it doesn't exist, thus
-        # abort the optimization attempt and do a full sync.
+        # Exit code 128 means "couldn't find the ref you asked for"; if we're
+        # in sha1 mode, we just tried sync'ing from the upstream field; it
+        # doesn't exist, thus abort the optimization attempt and do a full sync.
         break
       elif ret < 0:
         # Git died with a signal, exit immediately
@@ -1987,20 +2009,24 @@
                                    initial=False, quiet=quiet, alt_dir=alt_dir)
         if self.clone_depth:
           self.clone_depth = None
-          return self._RemoteFetch(name=name, current_branch_only=current_branch_only,
+          return self._RemoteFetch(name=name,
+                                   current_branch_only=current_branch_only,
                                    initial=False, quiet=quiet, alt_dir=alt_dir)
 
     return ok
 
   def _ApplyCloneBundle(self, initial=False, quiet=False):
-    if initial and (self.manifest.manifestProject.config.GetString('repo.depth') or self.clone_depth):
+    if initial and \
+        (self.manifest.manifestProject.config.GetString('repo.depth') or
+         self.clone_depth):
       return False
 
     remote = self.GetRemote(self.remote.name)
     bundle_url = remote.url + '/clone.bundle'
     bundle_url = GitConfig.ForUser().UrlInsteadOf(bundle_url)
-    if GetSchemeFromUrl(bundle_url) not in (
-        'http', 'https', 'persistent-http', 'persistent-https'):
+    if GetSchemeFromUrl(bundle_url) not in ('http', 'https',
+                                            'persistent-http',
+                                            'persistent-https'):
       return False
 
     bundle_dst = os.path.join(self.gitdir, 'clone.bundle')
@@ -2049,7 +2075,7 @@
         os.remove(tmpPath)
     if 'http_proxy' in os.environ and 'darwin' == sys.platform:
       cmd += ['--proxy', os.environ['http_proxy']]
-    with GetUrlCookieFile(srcUrl, quiet) as (cookiefile, proxy):
+    with GetUrlCookieFile(srcUrl, quiet) as (cookiefile, _proxy):
       if cookiefile:
         cmd += ['--cookie', cookiefile, '--cookie-jar', cookiefile]
       if srcUrl.startswith('persistent-'):
@@ -2168,11 +2194,12 @@
           self._CheckDirReference(self.objdir, self.gitdir, share_refs=False)
         except GitError as e:
           if force_sync:
-            print("Retrying clone after deleting %s" % self.gitdir, file=sys.stderr)
+            print("Retrying clone after deleting %s" %
+                  self.gitdir, file=sys.stderr)
             try:
               shutil.rmtree(os.path.realpath(self.gitdir))
-              if self.worktree and os.path.exists(
-                  os.path.realpath(self.worktree)):
+              if self.worktree and os.path.exists(os.path.realpath
+                                                  (self.worktree)):
                 shutil.rmtree(os.path.realpath(self.worktree))
               return self._InitGitDir(mirror_git=mirror_git, force_sync=False)
             except:
@@ -2231,7 +2258,7 @@
       name = os.path.basename(stock_hook)
 
       if name in ('commit-msg',) and not self.remote.review \
-            and not self is self.manifest.manifestProject:
+              and self is not self.manifest.manifestProject:
         # Don't install a Gerrit Code Review hook if this
         # project does not appear to use it for reviews.
         #
@@ -2246,7 +2273,8 @@
         if filecmp.cmp(stock_hook, dst, shallow=False):
           os.remove(dst)
         else:
-          _warn("%s: Not replacing locally modified %s hook", self.relpath, name)
+          _warn("%s: Not replacing locally modified %s hook",
+                self.relpath, name)
           continue
       try:
         os.symlink(os.path.relpath(stock_hook, os.path.dirname(dst)), dst)
@@ -2292,8 +2320,8 @@
         self.bare_git.symbolic_ref('-m', msg, ref, dst)
 
   def _CheckDirReference(self, srcdir, destdir, share_refs):
-    symlink_files = self.shareable_files
-    symlink_dirs = self.shareable_dirs
+    symlink_files = self.shareable_files[:]
+    symlink_dirs = self.shareable_dirs[:]
     if share_refs:
       symlink_files += self.working_tree_files
       symlink_dirs += self.working_tree_dirs
@@ -2321,8 +2349,8 @@
       copy_all: If true, copy all remaining files from |gitdir| -> |dotgit|.
           This saves you the effort of initializing |dotgit| yourself.
     """
-    symlink_files = self.shareable_files
-    symlink_dirs = self.shareable_dirs
+    symlink_files = self.shareable_files[:]
+    symlink_dirs = self.shareable_dirs[:]
     if share_refs:
       symlink_files += self.working_tree_files
       symlink_dirs += self.working_tree_dirs
@@ -2414,7 +2442,7 @@
   def _allrefs(self):
     return self.bare_ref.all
 
-  def _getLogs(self, rev1, rev2, oneline=False, color=True):
+  def _getLogs(self, rev1, rev2, oneline=False, color=True, pretty_format=None):
     """Get logs between two revisions of this project."""
     comp = '..'
     if rev1:
@@ -2425,6 +2453,8 @@
       out = DiffColoring(self.config)
       if out.is_on and color:
         cmd.append('--color')
+      if pretty_format is not None:
+        cmd.append('--pretty=format:%s' % pretty_format)
       if oneline:
         cmd.append('--oneline')
 
@@ -2441,17 +2471,21 @@
           raise
     return None
 
-  def getAddedAndRemovedLogs(self, toProject, oneline=False, color=True):
+  def getAddedAndRemovedLogs(self, toProject, oneline=False, color=True,
+                             pretty_format=None):
     """Get the list of logs from this revision to given revisionId"""
     logs = {}
     selfId = self.GetRevisionId(self._allrefs)
     toId = toProject.GetRevisionId(toProject._allrefs)
 
-    logs['added'] = self._getLogs(selfId, toId, oneline=oneline, color=color)
-    logs['removed'] = self._getLogs(toId, selfId, oneline=oneline, color=color)
+    logs['added'] = self._getLogs(selfId, toId, oneline=oneline, color=color,
+                                  pretty_format=pretty_format)
+    logs['removed'] = self._getLogs(toId, selfId, oneline=oneline, color=color,
+                                    pretty_format=pretty_format)
     return logs
 
   class _GitGetByExec(object):
+
     def __init__(self, project, bare, gitdir):
       self._project = project
       self._bare = bare
@@ -2470,8 +2504,8 @@
       if p.Wait() == 0:
         out = p.stdout
         if out:
+          # Backslash is not anomalous
           return out[:-1].split('\0')  # pylint: disable=W1401
-                                       # Backslash is not anomalous
       return []
 
     def DiffZ(self, name, *args):
@@ -2497,6 +2531,7 @@
               break
 
             class _Info(object):
+
               def __init__(self, path, omode, nmode, oid, nid, state):
                 self.path = path
                 self.src_path = None
@@ -2599,10 +2634,8 @@
           line = line[:-1]
         r.append(line)
       if p.Wait() != 0:
-        raise GitError('%s rev-list %s: %s' % (
-                       self._project.name,
-                       str(args),
-                       p.stderr))
+        raise GitError('%s rev-list %s: %s' %
+                       (self._project.name, str(args), p.stderr))
       return r
 
     def __getattr__(self, name):
@@ -2625,6 +2658,7 @@
         A callable object that will try to call git with the named command.
       """
       name = name.replace('_', '-')
+
       def runner(*args, **kwargs):
         cmdv = []
         config = kwargs.pop('config', None)
@@ -2647,10 +2681,8 @@
                        capture_stdout=True,
                        capture_stderr=True)
         if p.Wait() != 0:
-          raise GitError('%s %s: %s' % (
-                         self._project.name,
-                         name,
-                         p.stderr))
+          raise GitError('%s %s: %s' %
+                         (self._project.name, name, p.stderr))
         r = p.stdout
         try:
           r = r.decode('utf-8')
@@ -2663,14 +2695,19 @@
 
 
 class _PriorSyncFailedError(Exception):
+
   def __str__(self):
     return 'prior sync failed; rebase still in progress'
 
+
 class _DirtyError(Exception):
+
   def __str__(self):
     return 'contains uncommitted changes'
 
+
 class _InfoMessage(object):
+
   def __init__(self, project, text):
     self.project = project
     self.text = text
@@ -2679,7 +2716,9 @@
     syncbuf.out.info('%s/: %s', self.project.relpath, self.text)
     syncbuf.out.nl()
 
+
 class _Failure(object):
+
   def __init__(self, project, why):
     self.project = project
     self.why = why
@@ -2690,7 +2729,9 @@
                      str(self.why))
     syncbuf.out.nl()
 
+
 class _Later(object):
+
   def __init__(self, project, action):
     self.project = project
     self.action = action
@@ -2707,14 +2748,18 @@
       out.nl()
       return False
 
+
 class _SyncColoring(Coloring):
+
   def __init__(self, config):
     Coloring.__init__(self, config, 'reposync')
     self.project = self.printer('header', attr='bold')
     self.info = self.printer('info')
     self.fail = self.printer('fail', fg='red')
 
+
 class SyncBuffer(object):
+
   def __init__(self, config, detach_head=False):
     self._messages = []
     self._failures = []
@@ -2770,8 +2815,10 @@
 
 
 class MetaProject(Project):
+
   """A special project housed under .repo.
   """
+
   def __init__(self, manifest, name, gitdir, worktree):
     Project.__init__(self,
                      manifest=manifest,
@@ -2805,10 +2852,9 @@
     syncbuf.Finish()
 
     return GitCommand(self,
-                        ['update-ref', '-d', 'refs/heads/default'],
-                        capture_stdout=True,
-                        capture_stderr=True).Wait() == 0
-
+                      ['update-ref', '-d', 'refs/heads/default'],
+                      capture_stdout=True,
+                      capture_stderr=True).Wait() == 0
 
   @property
   def LastFetch(self):
diff --git a/repo b/repo
index 4721174..e5cb890 100755
--- a/repo
+++ b/repo
@@ -543,7 +543,7 @@
     try:
       r = urllib.request.urlopen(url)
     except urllib.error.HTTPError as e:
-      if e.code in [401, 403, 404]:
+      if e.code in [401, 403, 404, 501]:
         return False
       _print('fatal: Cannot get %s' % url, file=sys.stderr)
       _print('fatal: HTTP error %s' % e.code, file=sys.stderr)
diff --git a/subcmds/diffmanifests.py b/subcmds/diffmanifests.py
index 0599868..751a202 100644
--- a/subcmds/diffmanifests.py
+++ b/subcmds/diffmanifests.py
@@ -71,6 +71,10 @@
     p.add_option('--no-color',
                  dest='color', action='store_false', default=True,
                  help='does not display the diff in color.')
+    p.add_option('--pretty-format',
+                 dest='pretty_format', action='store',
+                 metavar='<FORMAT>',
+                 help='print the log using a custom git pretty format string')
 
   def _printRawDiff(self, diff):
     for project in diff['added']:
@@ -92,7 +96,7 @@
                                      otherProject.revisionExpr))
       self.out.nl()
 
-  def _printDiff(self, diff, color=True):
+  def _printDiff(self, diff, color=True, pretty_format=None):
     if diff['added']:
       self.out.nl()
       self.printText('added projects : \n')
@@ -124,7 +128,8 @@
         self.printText(' to ')
         self.printRevision(otherProject.revisionExpr)
         self.out.nl()
-        self._printLogs(project, otherProject, raw=False, color=color)
+        self._printLogs(project, otherProject, raw=False, color=color,
+                        pretty_format=pretty_format)
         self.out.nl()
 
     if diff['unreachable']:
@@ -139,9 +144,13 @@
         self.printText(' not found')
         self.out.nl()
 
-  def _printLogs(self, project, otherProject, raw=False, color=True):
-    logs = project.getAddedAndRemovedLogs(otherProject, oneline=True,
-                                          color=color)
+  def _printLogs(self, project, otherProject, raw=False, color=True,
+                 pretty_format=None):
+
+    logs = project.getAddedAndRemovedLogs(otherProject,
+                                          oneline=(pretty_format is None),
+                                          color=color,
+                                          pretty_format=pretty_format)
     if logs['removed']:
       removedLogs = logs['removed'].split('\n')
       for log in removedLogs:
@@ -192,4 +201,4 @@
     if opt.raw:
       self._printRawDiff(diff)
     else:
-      self._printDiff(diff, color=opt.color)
+      self._printDiff(diff, color=opt.color, pretty_format=opt.pretty_format)
diff --git a/subcmds/forall.py b/subcmds/forall.py
index b10f34b..07ee8d5 100644
--- a/subcmds/forall.py
+++ b/subcmds/forall.py
@@ -120,6 +120,9 @@
     p.add_option('-r', '--regex',
                  dest='regex', action='store_true',
                  help="Execute the command only on projects matching regex or wildcard expression")
+    p.add_option('-i', '--inverse-regex',
+                 dest='inverse_regex', action='store_true',
+                 help="Execute the command only on projects not matching regex or wildcard expression")
     p.add_option('-g', '--groups',
                  dest='groups',
                  help="Execute the command only on projects matching the specified groups")
@@ -215,10 +218,12 @@
     if os.path.isfile(smart_sync_manifest_path):
       self.manifest.Override(smart_sync_manifest_path)
 
-    if not opt.regex:
-      projects = self.GetProjects(args, groups=opt.groups)
-    else:
+    if opt.regex:
       projects = self.FindProjects(args)
+    elif opt.inverse_regex:
+      projects = self.FindProjects(args, inverse=True)
+    else:
+      projects = self.GetProjects(args, groups=opt.groups)
 
     os.environ['REPO_COUNT'] = str(len(projects))
 
diff --git a/subcmds/sync.py b/subcmds/sync.py
index 4af411c..9124a65 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -242,7 +242,7 @@
     if show_smart:
       p.add_option('-s', '--smart-sync',
                    dest='smart_sync', action='store_true',
-                   help='smart sync using manifest from a known good build')
+                   help='smart sync using manifest from the latest known good build')
       p.add_option('-t', '--smart-tag',
                    dest='smart_tag', action='store',
                    help='smart sync using manifest from a known tag')