$ git clone -n https://src.fedoraproject.org/rpms/kblocks.git /var/lib/mock/f42-build-3279311-41337/root/chroot_tmpdir/scmroot/kblocks
Cloning into '/var/lib/mock/f42-build-3279311-41337/root/chroot_tmpdir/scmroot/kblocks'...
$ git fetch origin 5dad70c3ae23f75ac3a350ea743928bab1e4cc8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kblocks
 * [new ref]         5dad70c3ae23f75ac3a350ea743928bab1e4cc8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5dad70c Rebuild for ppc64le enablement