$ git clone -n https://src.fedoraproject.org/rpms/libspectrum.git /var/lib/mock/f41-build-side-1-2645494-27108/root/chroot_tmpdir/scmroot/libspectrum
Cloning into '/var/lib/mock/f41-build-side-1-2645494-27108/root/chroot_tmpdir/scmroot/libspectrum'...
$ git fetch origin e23e33b584ff033530df577b7d70492cbf300f31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libspectrum
 * [new ref]         e23e33b584ff033530df577b7d70492cbf300f31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e23e33b convert GPLv2+ license to SPDX