$ git clone -n https://github.com/xcp-ng-rpms/xapi /var/lib/mock/v8.3-u-srodot1-11522-29840/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-srodot1-11522-29840/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin cf81afe9137244d0d62ccf71c10e902e324490c8:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         cf81afe9137244d0d62ccf71c10e902e324490c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf81afe bump release for test build