$ git clone -n https://src.fedoraproject.org/rpms/libpoly.git /var/lib/mock/f40-build-757288-119337/root/chroot_tmpdir/scmroot/libpoly
Cloning into '/var/lib/mock/f40-build-757288-119337/root/chroot_tmpdir/scmroot/libpoly'...
$ git fetch origin fd5693f480e9bf57e03311a0c9104b7329457cea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpoly
 * [new ref]         fd5693f480e9bf57e03311a0c9104b7329457cea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd5693f Version 0.1.13