$ git clone -n https://github.com/xcp-ng-rpms/blktap /var/lib/mock/v9.0-u-ydi1-11207-29593/root/chroot_tmpdir/scmroot/blktap
Cloning into '/var/lib/mock/v9.0-u-ydi1-11207-29593/root/chroot_tmpdir/scmroot/blktap'...
$ git fetch origin 88ec022f4e30797be8c2bb17027fba0869782a9b:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/blktap
 * [new ref]         88ec022f4e30797be8c2bb17027fba0869782a9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 88ec022 bump release for test build