$ git clone -n https://src.fedoraproject.org/rpms/libXxf86vm.git /var/lib/mock/f40-build-738294-107786/root/chroot_tmpdir/scmroot/libXxf86vm
Cloning into '/var/lib/mock/f40-build-738294-107786/root/chroot_tmpdir/scmroot/libXxf86vm'...
$ git fetch origin 6fe05ea4b7c1af6d299d35b6cb4c0605fa3dc1d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXxf86vm
 * [new ref]         6fe05ea4b7c1af6d299d35b6cb4c0605fa3dc1d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fe05ea SPDX Migration