$ git clone -n https://src.fedoraproject.org/rpms/kf6-kfilemetadata.git /var/lib/mock/f42-build-side-1-3573574-46768/root/chroot_tmpdir/scmroot/kf6-kfilemetadata
Cloning into '/var/lib/mock/f42-build-side-1-3573574-46768/root/chroot_tmpdir/scmroot/kf6-kfilemetadata'...
$ git fetch origin adf4026af74006a99512230a3563d5cb15abc3f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kfilemetadata
 * [new ref]         adf4026af74006a99512230a3563d5cb15abc3f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at adf4026 6.15 and plasma 3.4 compatibility rebuild