Allow clone depth to be specified per project

If the clone-depth attribute is set on a project, its value will
be used to set the depth when fetching the git.  The value, if
given, must be a positive integer.

The value in the clone-depth attribute overrides any value given to
repo init via the --depth command line option.

Change-Id: I273015b3724213600b63e40cca4cafaa9f782ddf

project.py

@@ -488,6 +488,7 @@ class Project(object):
                groups = None,
                sync_c = False,
                sync_s = False,
+               clone_depth = None,
                upstream = None,
                parent = None,
                is_derived = False):
@@ -533,6 +534,7 @@ class Project(object):
     self.groups = groups
     self.sync_c = sync_c
     self.sync_s = sync_s
+    self.clone_depth = clone_depth
     self.upstream = upstream
     self.parent = parent
     self.is_derived = is_derived
@@ -1645,7 +1647,10 @@ class Project(object):
 
     # The --depth option only affects the initial fetch; after that we'll do
     # full fetches of changes.
-    depth = self.manifest.manifestProject.config.GetString('repo.depth')
+    if self.clone_depth:
+      depth = self.clone_depth
+    else:
+      depth = self.manifest.manifestProject.config.GetString('repo.depth')
     if depth and initial:
       cmd.append('--depth=%s' % depth)
 
@@ -1705,7 +1710,7 @@ class Project(object):
     return ok
 
   def _ApplyCloneBundle(self, initial=False, quiet=False):
-    if initial and self.manifest.manifestProject.config.GetString('repo.depth'):
+    if initial and (self.manifest.manifestProject.config.GetString('repo.depth') or self.clone_depth):
       return False
 
     remote = self.GetRemote(self.remote.name)