$ git clone -n https://src.fedoraproject.org/rpms/R-gss.git /var/lib/mock/f41-build-side-1-2630783-25616/root/chroot_tmpdir/scmroot/R-gss
Cloning into '/var/lib/mock/f41-build-side-1-2630783-25616/root/chroot_tmpdir/scmroot/R-gss'...
$ git fetch origin ae9a971a2e04c4a8d6597e40c7181deea01c6527:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gss
 * [new ref]         ae9a971a2e04c4a8d6597e40c7181deea01c6527 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae9a971 convert GPLv2+ license to SPDX