$ git clone -n https://src.fedoraproject.org/rpms/guacamole-server.git /var/lib/mock/f40-build-762405-122030/root/chroot_tmpdir/scmroot/guacamole-server
Cloning into '/var/lib/mock/f40-build-762405-122030/root/chroot_tmpdir/scmroot/guacamole-server'...
$ git fetch origin 9199d8dfcd4d8010a1106b1de5d9ed652b181142:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guacamole-server
 * [new ref]         9199d8dfcd4d8010a1106b1de5d9ed652b181142 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9199d8d Update to 1.5.4 (#2223510)