$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-u-abourgeois2-9444-28187/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-u-abourgeois2-9444-28187/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin 18aa9b8ee9ccf808684a67c19006279daa28ca17:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         18aa9b8ee9ccf808684a67c19006279daa28ca17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18aa9b8 bump release for test build