git cl try last worked on Wednesday, Oct 19 in this CL
https://codereview.chromium.org/2425623004/

and first failed on Thursday Oct 20 in this CL
https://codereview.chromium.org/2424233004/

This works:
git cl try --bot=linux_rel -m tryserver.libyuv

I wonder what may have changed here. 
I double-checked and fbarchard@chromium.org is in https://chrome-infra-auth.appspot.com/auth/groups#external/project-chromium-committers which is where https://chrome-infra-auth.appspot.com/auth/groups#project-libyuv-tryjob-access inherits access from.

The fact that it worked before tells me something must have changed.

nodir@ any idea? Is the buildbucket not using the right ACL anymore?

It works for with git cl try --bot=linux_rel -m tryserver.libyuv
but if Frank runs without specifying --bot, it fails:

git cl try -m tryserver.libyuv
ERROR: Access denied: User user:fbarchard@google.com cannot add builds to bucket tryserver.libyuv

same with his chromium.org account.

I added fbarchard@google.com to https://chrome-infra-auth.appspot.com/auth/groups#project-libyuv-tryjob-access to be sure, since only the chromium.org account is listed as Chromium committer.

note that it says "tryserver.libyuv" bucket, not "master.tryserver.libyuv"

https://chromiumcodereview.appspot.com/2419113002 is culprit
it should have affected chromium in a major way

Does this work?

git cl try -m master.tryserver.libyuv

I'll look into it but for me locally "git cl try -m tryserver.libyuv" works, it triggers a dry run.

https://codereview.chromium.org/2442393002

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/depot_tools.git/+/70d11c3759a5113bd2c26a1026467021caac6327

commit 70d11c3759a5113bd2c26a1026467021caac6327
Author: nodir <nodir@chromium.org>
Date: Mon Oct 24 18:48:00 2016

git_cl: fix GetPreferredTryMasters() feature

It was broken in https://chromiumcodereview.appspot.com/2419113002

R=borenet@chromium.org
BUG= 658317 

Review-Url: https://codereview.chromium.org/2442393002

[modify] https://crrev.com/70d11c3759a5113bd2c26a1026467021caac6327/git_cl.py

does it work now?