$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-v-qcow2-11276-29621/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-v-qcow2-11276-29621/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin 1f2c1e0fcebf379f6dd078da2b485a5f87ec82bc:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         1f2c1e0fcebf379f6dd078da2b485a5f87ec82bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f2c1e0 Add QCOW2 support