$ git clone -n https://src.fedoraproject.org/rpms/potrace.git /var/lib/mock/f40-build-2705707-71012/root/chroot_tmpdir/scmroot/potrace
Cloning into '/var/lib/mock/f40-build-2705707-71012/root/chroot_tmpdir/scmroot/potrace'...
$ git fetch origin 190c092cd9702335d6ed848169a2e7f75fec6f51:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/potrace
 * [new ref]         190c092cd9702335d6ed848169a2e7f75fec6f51 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 190c092 Migrate to SPDX license