$ git clone -n https://src.fedoraproject.org/rpms/plasma-dialer.git /var/lib/mock/f42-bootstrap-3533859-46421/root/chroot_tmpdir/scmroot/plasma-dialer
Cloning into '/var/lib/mock/f42-bootstrap-3533859-46421/root/chroot_tmpdir/scmroot/plasma-dialer'...
$ git fetch origin 19b217c8b7b654640ed2ae9ec82e2faf14ceb7a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-dialer
 * [new ref]         19b217c8b7b654640ed2ae9ec82e2faf14ceb7a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19b217c 6.3.5