Use different exit code when desired dep roll is a no-op

Use different exit code when desired dep roll is a no-op

BUG=609899
Committed: https://chromium.googlesource.com/chromium/tools/depot_tools/+/7036c4f0a63f61bfd7459cab352a0f5541590c27

[smut, 2016-06-08 22:56:48]

smut@google.com changed reviewers:
+ agable@chromium.org, tandrii@chromium.org

[smut, 2016-06-08 22:56:49]

Related to the widevine svn -> git migration. They used to use roll_dep_svn.py
which didn't care if the target revision was the same as the original revision.
roll_dep.py, on the other hand, considers this scenario an error. The different
exit code allows existing clients to keep the functionality whereby nothing to
roll is considered an error while allowing widevine to ignore it.

[tandrii(chromium), 2016-06-09 10:57:50]

lgtm

[tandrii(chromium), 2016-06-09 10:58:25]

On 2016/06/09 10:57:50, tandrii(chromium) wrote:
> lgtm

note that depot_tools is on git now, you'd need to re-upload the patch after
removing .svn from your .git/config.

[agable, 2016-06-09 16:40:10]

LGTM. Shouldn't need to reupload, the CQ trusts the 'project' instead of the
'base_url' now, so that shouldn't matter as long as you CQ this.

[smut, 2016-06-09 21:24:46]

The CQ bit was checked by smut@google.com

[commit-bot: I haz the power, 2016-06-09 21:24:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2047013005/1

[commit-bot: I haz the power, 2016-06-09 21:28:50]

Description was changed from

==========
Use different exit code when desired dep roll is a no-op

BUG=609899
==========

to

==========
Use different exit code when desired dep roll is a no-op

BUG=609899

Committed:
https://chromium.googlesource.com/chromium/tools/depot_tools/+/7036c4f0a63f61...
==========

[commit-bot: I haz the power, 2016-06-09 21:28:51]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/tools/depot_tools/+/7036c4f0a63f61...