Always return the output from ref-update hook

Change I5905c44c7 moved the invocation of the ref-update hook out of
the ReceiveCommits implementation and into CommitValidators. Since
then, the output of the ref-update hook is not sent back to the git
client except in the case of an error or rejection.

Update the handling of the ref-update hook in the plugin so that its
output is returned back to the caller as a commit validation message
which is then sent to the client.

Change-Id: I88af8a3c690cc226214208c3c93f552f054ccae0
Reported-By: Robert Niemi <>
2 files changed
tree: e16728521ca6971c99921adc9eeeea37bf08b548
  1. src/
  2. .gitignore
  3. BUCK