$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-v-qcow2-10107-28724/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-v-qcow2-10107-28724/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin 088915386279d6d8ae7cff7ee47deae7ed938d37:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         088915386279d6d8ae7cff7ee47deae7ed938d37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0889153 qcow2: fix scheduler concurrency