project: Isolate ManifestProject from RepoProject

Create RepoProject and ManifestProject, inheriting from MetaProject,
  with methods separated for isolation and clarity.

Change-Id: Ic1d6efc65c99470290fea612e2abaf8670d199f4
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/334139
Tested-by: LaMont Jones <lamontjones@google.com>
Reviewed-by: Mike Frysinger <vapier@google.com>

manifest_xml.py

@@ -25,7 +25,8 @@ import gitc_utils
 from git_config import GitConfig, IsId
 from git_refs import R_HEADS, HEAD
 import platform_utils
-from project import Annotation, RemoteSpec, Project, MetaProject
+from project import (Annotation, RemoteSpec, Project, RepoProject,
+                     ManifestProject)
 from error import (ManifestParseError, ManifestInvalidPathError,
                    ManifestInvalidRevisionError)
 from wrapper import Wrapper
@@ -360,7 +361,7 @@ class XmlManifest(object):
     # multi-tree.
     self._outer_client = outer_client or self
 
-    self.repoProject = MetaProject(self, 'repo',
+    self.repoProject = RepoProject(self, 'repo',
                                    gitdir=os.path.join(repodir, 'repo/.git'),
                                    worktree=os.path.join(repodir, 'repo'))
 
@@ -953,7 +954,7 @@ https://gerrit.googlesource.com/git-repo/+/HEAD/docs/manifest-format.md
   def SubmanifestProject(self, submanifest_path):
     """Return a manifestProject for a submanifest."""
     subdir = self.SubmanifestInfoDir(submanifest_path)
-    mp = MetaProject(self, 'manifests',
+    mp = ManifestProject(self, 'manifests',
                          gitdir=os.path.join(subdir, 'manifests.git'),
                          worktree=os.path.join(subdir, 'manifests'))
     return mp

project.py

@@ -3284,9 +3284,7 @@ class SyncBuffer(object):
 
 
 class MetaProject(Project):
-
-  """A special project housed under .repo.
-  """
+  """A special project housed under .repo."""
 
   def __init__(self, manifest, name, gitdir, worktree):
     Project.__init__(self,
@@ -3310,33 +3308,9 @@ class MetaProject(Project):
           self.revisionExpr = base
           self.revisionId = None
 
-  def MetaBranchSwitch(self, submodules=False):
-    """ Prepare MetaProject for manifest branch switch
-    """
-
-    # detach and delete manifest branch, allowing a new
-    # branch to take over
-    syncbuf = SyncBuffer(self.config, detach_head=True)
-    self.Sync_LocalHalf(syncbuf, submodules=submodules)
-    syncbuf.Finish()
-
-    return GitCommand(self,
-                      ['update-ref', '-d', 'refs/heads/default'],
-                      capture_stdout=True,
-                      capture_stderr=True).Wait() == 0
-
-  @property
-  def LastFetch(self):
-    try:
-      fh = os.path.join(self.gitdir, 'FETCH_HEAD')
-      return os.path.getmtime(fh)
-    except OSError:
-      return 0
-
   @property
   def HasChanges(self):
-    """Has the remote received new commits not yet checked out?
-    """
+    """Has the remote received new commits not yet checked out?"""
     if not self.remote or not self.revisionExpr:
       return False
 
@@ -3354,3 +3328,32 @@ class MetaProject(Project):
     elif self._revlist(not_rev(HEAD), revid):
       return True
     return False
+
+
+class RepoProject(MetaProject):
+  """The MetaProject for repo itself."""
+
+  @property
+  def LastFetch(self):
+    try:
+      fh = os.path.join(self.gitdir, 'FETCH_HEAD')
+      return os.path.getmtime(fh)
+    except OSError:
+      return 0
+
+class ManifestProject(MetaProject):
+  """The MetaProject for manifests."""
+
+  def MetaBranchSwitch(self, submodules=False):
+    """Prepare for manifest branch switch."""
+
+    # detach and delete manifest branch, allowing a new
+    # branch to take over
+    syncbuf = SyncBuffer(self.config, detach_head=True)
+    self.Sync_LocalHalf(syncbuf, submodules=submodules)
+    syncbuf.Finish()
+
+    return GitCommand(self,
+                      ['update-ref', '-d', 'refs/heads/default'],
+                      capture_stdout=True,
+                      capture_stderr=True).Wait() == 0