$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-u-abourgeois2-9709-28426/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-u-abourgeois2-9709-28426/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin 8a20659a3a222e4dfc5f779b01fd7d90950991b0:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         8a20659a3a222e4dfc5f779b01fd7d90950991b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a20659 bump release for test build