$ git clone -n https://src.fedoraproject.org/rpms/freetennis.git /var/lib/mock/f39-build-2165767-50984/root/chroot_tmpdir/scmroot/freetennis
Cloning into '/var/lib/mock/f39-build-2165767-50984/root/chroot_tmpdir/scmroot/freetennis'...
$ git fetch origin 12d08a6ba57999aa9e19d71068eba34299a020a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/freetennis
 * [new ref]         12d08a6ba57999aa9e19d71068eba34299a020a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12d08a6 Fix FTBFS on bytecode-only architectures (rhbz#2225813)