$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-abourgeois2-9428-28175/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-abourgeois2-9428-28175/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 7b08a11b965562aff655a3bcd5622aeb028bdf56:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         7b08a11b965562aff655a3bcd5622aeb028bdf56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b08a11 bump release for test build