Use %B format instead of %s\n\n%b to get the raw commit message from a hash.

\n doesn't work on Windows, and %B is shorter anyway.

BUG=586344

Review URL: https://codereview.chromium.org/1705193003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@298845 0039d316-1c4b-4281-b951-d872f2087c98

git_cl.py

@@ -2021,7 +2021,7 @@ def GerritUpload(options, args, cl, change):
   if options.squash:
     # Try to get the message from a previous upload.
     shadow_branch = 'refs/heads/git_cl_uploads/' + cl.GetBranch()
-    message = RunGitSilent(['show', '--format=%s\n\n%b', '-s', shadow_branch])
+    message = RunGitSilent(['show', '--format=%B', '-s', shadow_branch])
     if not message:
       if not options.force:
         change_desc.prompt()

tests/git_cl_test.py

@@ -602,7 +602,7 @@ class TestGitCl(TestCase):
     if squash:
       ref_to_push = 'abcdef0123456789'
       calls += [
-          ((['git', 'show', '--format=%s\n\n%b', '-s',
+          ((['git', 'show', '--format=%B', '-s',
             'refs/heads/git_cl_uploads/master'],),
            (description, 0)),
           ((['git', 'config', 'branch.master.merge'],),