$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-gtn1-10196-28778/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-gtn1-10196-28778/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin ef0fc3cbab91c9d30a9cdf466b59d841c789409d:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         ef0fc3cbab91c9d30a9cdf466b59d841c789409d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef0fc3c bump release for test build