Let git cl presubmit work with no network

Bug: 1309977
Change-Id: Ifca6e60c1fb2ff76f6a8dee9129d4d661ba196a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3606733
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>

presubmit_canned_checks.py

@@ -1388,13 +1388,16 @@ def PanProjectChecks(input_api, output_api,
     snapshot_memory[:] = (dt2, msg)
 
   snapshot("checking owners files format")
-  results.extend(input_api.canned_checks.CheckOwnersFormat(
-      input_api, output_api))
+  try:
+    results.extend(input_api.canned_checks.CheckOwnersFormat(
+        input_api, output_api))
 
-  if owners_check:
-    snapshot("checking owners")
-    results.extend(input_api.canned_checks.CheckOwners(
-        input_api, output_api, source_file_filter=None))
+    if owners_check:
+      snapshot("checking owners")
+      results.extend(input_api.canned_checks.CheckOwners(
+          input_api, output_api, source_file_filter=None))
+  except Exception as e:
+    print('Failed to check owners - %s' % str(e))
 
   snapshot("checking long lines")
   results.extend(input_api.canned_checks.CheckLongLines(

presubmit_support.py

@@ -665,12 +665,15 @@ class InputApi(object):
 
     self.owners_client = None
     if self.gerrit:
-      self.owners_client = owners_client.GetCodeOwnersClient(
-          root=change.RepositoryRoot(),
-          upstream=change.UpstreamBranch(),
-          host=self.gerrit.host,
-          project=self.gerrit.project,
-          branch=self.gerrit.branch)
+      try:
+        self.owners_client = owners_client.GetCodeOwnersClient(
+            root=change.RepositoryRoot(),
+            upstream=change.UpstreamBranch(),
+            host=self.gerrit.host,
+            project=self.gerrit.project,
+            branch=self.gerrit.branch)
+      except Exception as e:
+        print('Failed to set owners_client - %s' % str(e))
     self.owners_db = owners_db.Database(
         change.RepositoryRoot(), fopen=open, os_path=self.os_path)
     self.owners_finder = owners_finder.OwnersFinder