Fix 'gcl help' when not run inside a svn checkout.

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/150114

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@19628 0039d316-1c4b-4281-b951-d872f2087c98

gcl.py

@@ -96,7 +96,7 @@ def GetRepositoryRoot():
     infos = gclient.CaptureSVNInfo(os.getcwd(), print_error=False)
     cur_dir_repo_root = infos.get("Repository Root")
     if not cur_dir_repo_root:
-      raise Exception("gcl run outside of repository")
+      raise gclient.Error("gcl run outside of repository")
 
     REPOSITORY_ROOT = os.getcwd()
     while True:
@@ -138,7 +138,10 @@ def GetCachedFile(filename, max_age=60*60*24*3, use_root=False):
     # Don't try to look up twice.
     FILES_CACHE[filename] = None
     # First we check if we have a cached version.
+    try:
       cached_file = os.path.join(GetCacheDir(), filename)
+    except gclient.Error:
+      return None
     if (not os.path.exists(cached_file) or
         os.stat(cached_file).st_mtime > max_age):
       dir_info = gclient.CaptureSVNInfo(".")
@@ -1099,6 +1102,7 @@ def main(argv=None):
     Help()
     return 0;
 
+  try:
     # Create the directories where we store information about changelists if it
     # doesn't exist.
     if not os.path.exists(GetInfoDir()):
@@ -1114,6 +1118,9 @@ def main(argv=None):
           shutil.move(file_path, GetChangesDir())
     if not os.path.exists(GetCacheDir()):
       os.mkdir(GetCacheDir())
+  except gclient.Error:
+    # Will throw an exception if not run in a svn checkout.
+    pass
 
   # Commands that don't require an argument.
   command = argv[1]