$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-abourgeois1-9574-28322/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-abourgeois1-9574-28322/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin c911e7852f1d2c67d2bb7234649aaf82dae5eb94:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         c911e7852f1d2c67d2bb7234649aaf82dae5eb94 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c911e78 bump release for test build