$ git clone -n https://src.fedoraproject.org/rpms/kf5-grantleetheme.git /var/lib/mock/f38-build-side-42-init-devel-599777-26165/root/chroot_tmpdir/scmroot/kf5-grantleetheme
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-599777-26165/root/chroot_tmpdir/scmroot/kf5-grantleetheme'...
$ git fetch origin 943667fe2674bb3a1f03aa9391ad753ac961b993:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-grantleetheme
 * [new ref]         943667fe2674bb3a1f03aa9391ad753ac961b993 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 943667f Rebuild (grantlee-qt5)