$ git clone -n https://src.fedoraproject.org/rpms/plasma-dialer.git /var/lib/mock/f42-build-side-1-3583673-46890/root/chroot_tmpdir/scmroot/plasma-dialer
Cloning into '/var/lib/mock/f42-build-side-1-3583673-46890/root/chroot_tmpdir/scmroot/plasma-dialer'...
$ git fetch origin 82cc43127132e83ce9299685d0700b7f78e86a9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-dialer
 * [new ref]         82cc43127132e83ce9299685d0700b7f78e86a9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82cc431 6.4.2