$ git clone -n https://src.fedoraproject.org/rpms/libnxz.git /var/lib/mock/f39-build-2566548-62096/root/chroot_tmpdir/scmroot/libnxz
Cloning into '/var/lib/mock/f39-build-2566548-62096/root/chroot_tmpdir/scmroot/libnxz'...
$ git fetch origin 58255dd43c50f4284058c57fbdcc3c14672537f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libnxz
 * [new ref]         58255dd43c50f4284058c57fbdcc3c14672537f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58255dd Convert to SPDX