$ git clone -n https://github.com/xcp-ng-rpms/blktap.git /var/lib/mock/v8.3-u-abourgeois2-8857-27796/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v8.3-u-abourgeois2-8857-27796/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin e05d66e5e203078e1d4e751be27c34d3d7ced3e9:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         e05d66e5e203078e1d4e751be27c34d3d7ced3e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e05d66e bump release for test build