Improve diagnostic message for wrong gclient config

BUG=591814
TEST=gclient sync prints the correct report locally
when config is wrong.

Review-Url: https://codereview.chromium.org/2018803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300671 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -1233,12 +1233,19 @@ solutions = [
             dep.url, self.root_dir, dep.name, self.outbuf)
         actual_url = scm.GetActualRemoteURL(self._options)
         if actual_url and not scm.DoesRemoteURLMatch(self._options):
+          mirror = scm.GetCacheMirror()
+          if mirror:
+            mirror_string = '%s (exists=%s)' % (mirror.mirror_path,
+                                                mirror.exists())
+          else:
+            mirror_string = 'not used'
           raise gclient_utils.Error('''
 Your .gclient file seems to be broken. The requested URL is different from what
 is actually checked out in %(checkout_path)s.
 
 The .gclient file contains:
-%(expected_url)s (%(expected_scm)s)
+URL: %(expected_url)s (%(expected_scm)s)
+Cache mirror: %(mirror_string)s
 
 The local checkout in %(checkout_path)s reports:
 %(actual_url)s (%(actual_scm)s)
@@ -1250,6 +1257,7 @@ want to set 'managed': False in .gclient.
 '''  % {'checkout_path': os.path.join(self.root_dir, dep.name),
         'expected_url': dep.url,
         'expected_scm': gclient_scm.GetScmName(dep.url),
+        'mirror_string' : mirror_string,
         'actual_url': actual_url,
         'actual_scm': gclient_scm.GetScmName(actual_url)})
 

gclient_scm.py

@@ -173,19 +173,24 @@ class SCMWrapper(object):
     # Get the second token of the first line of the log.
     return log.splitlines()[0].split(' ', 1)[1]
 
+  def GetCacheMirror(self):
+    if (getattr(self, 'cache_dir', None)):
+      url, _ = gclient_utils.SplitUrlRevision(self.url)
+      return git_cache.Mirror(url)
+    return None
+
   def GetActualRemoteURL(self, options):
     """Attempt to determine the remote URL for this SCMWrapper."""
     # Git
     if os.path.exists(os.path.join(self.checkout_path, '.git')):
       actual_remote_url = self._get_first_remote_url(self.checkout_path)
 
-      # If a cache_dir is used, obtain the actual remote URL from the cache.
-      if getattr(self, 'cache_dir', None):
-        url, _ = gclient_utils.SplitUrlRevision(self.url)
-        mirror = git_cache.Mirror(url)
-        if (mirror.exists() and mirror.mirror_path.replace('\\', '/') ==
-            actual_remote_url.replace('\\', '/')):
-          actual_remote_url = self._get_first_remote_url(mirror.mirror_path)
+      mirror = self.GetCacheMirror()
+      # If the cache is used, obtain the actual remote URL from there.
+      if (mirror and mirror.exists() and
+          mirror.mirror_path.replace('\\', '/') ==
+          actual_remote_url.replace('\\', '/')):
+        actual_remote_url = self._get_first_remote_url(mirror.mirror_path)
       return actual_remote_url
 
     # Svn