$ git clone -n https://src.fedoraproject.org/rpms/potrace.git /var/lib/mock/f45-build-28849-633/root/chroot_tmpdir/scmroot/potrace
Cloning into '/var/lib/mock/f45-build-28849-633/root/chroot_tmpdir/scmroot/potrace'...
$ git fetch origin e5b67e813070bec13ac2a54ee936376677acd314:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/potrace
 * [new ref]         e5b67e813070bec13ac2a54ee936376677acd314 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5b67e8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild