$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-incoming-11482-29780/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-incoming-11482-29780/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin d1cf13fccbde7660d7ef5895e975902250dd227f:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         d1cf13fccbde7660d7ef5895e975902250dd227f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1cf13f Fix udev rule file triggered by mdadm (with upstream rule)