$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-u-abourgeois2-10091-28712/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-u-abourgeois2-10091-28712/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin fded39749e165b4393c3acfa4cfd240e18c7ae91:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         fded39749e165b4393c3acfa4cfd240e18c7ae91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fded397 bump release for test build