$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-v-qcow2-9849-28564/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-v-qcow2-9849-28564/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin 9e1916c2ce27193eab04016fc27077740e4c74e4:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         9e1916c2ce27193eab04016fc27077740e4c74e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e1916c qcow2: Fix coalesce base image