$ git clone -n https://src.fedoraproject.org/rpms/libcircle.git /var/lib/mock/f40-build-2393268-60531/root/chroot_tmpdir/scmroot/libcircle
Cloning into '/var/lib/mock/f40-build-2393268-60531/root/chroot_tmpdir/scmroot/libcircle'...
$ git fetch origin 26e3cc774a95b8424769fa4070846704edec71ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcircle
 * [new ref]         26e3cc774a95b8424769fa4070846704edec71ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26e3cc7 exclude ix86