1 files changed, 23 insertions, 4 deletions

diff --git a/subcmds/sync.py b/subcmds/sync.py
index a8022d9d..27dd877d 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -423,7 +423,7 @@ uncommitted changes are present' % project.relpath
               # in the .netrc file.
               print >>sys.stderr, 'No credentials found for %s in .netrc' % \
                                   parse_result.hostname
-            except netrc.NetrcParseError, e:
+            except netrc.NetrcParseError as e:
               print >>sys.stderr, 'Error parsing .netrc file: %s' % e
 
         if (username and password):
@@ -470,11 +470,11 @@ uncommitted changes are present' % project.relpath
         else:
           print >>sys.stderr, 'error: %s' % manifest_str
           sys.exit(1)
-      except (socket.error, IOError, xmlrpclib.Fault), e:
+      except (socket.error, IOError, xmlrpclib.Fault) as e:
         print >>sys.stderr, 'error: cannot connect to manifest server %s:\n%s' % (
             self.manifest.manifest_server, e)
         sys.exit(1)
-      except xmlrpclib.ProtocolError, e:
+      except xmlrpclib.ProtocolError as e:
         print >>sys.stderr, 'error: cannot connect to manifest server %s:\n%d %s' % (
             self.manifest.manifest_server, e.errcode, e.errmsg)
         sys.exit(1)
@@ -512,12 +512,31 @@ uncommitted changes are present' % project.relpath
       to_fetch.sort(key=self._fetch_times.Get, reverse=True)
       self._fetch_times.Clear()
 
-      self._Fetch(to_fetch, opt)
+      fetched = self._Fetch(to_fetch, opt)
       _PostRepoFetch(rp, opt.no_repo_verify)
       if opt.network_only:
         # bail out now; the rest touches the working tree
         return
 
+      # Iteratively fetch missing and/or nested unregistered submodules
+      previously_missing_set = set()
+      while True:
+        self.manifest._Unload()
+        all_projects = self.GetProjects(args, missing_ok=True)
+        missing = []
+        for project in all_projects:
+          if project.gitdir not in fetched:
+            missing.append(project)
+        if not missing:
+          break
+        # Stop us from non-stopped fetching actually-missing repos: If set of
+        # missing repos has not been changed from last fetch, we break.
+        missing_set = set(p.name for p in missing)
+        if previously_missing_set == missing_set:
+          break
+        previously_missing_set = missing_set
+        fetched.update(self._Fetch(missing, opt))
+
     if self.manifest.IsMirror:
       # bail out now, we have no working tree
       return