$ git clone -n https://src.fedoraproject.org/rpms/libpoly.git /var/lib/mock/f40-build-2672653-67533/root/chroot_tmpdir/scmroot/libpoly
Cloning into '/var/lib/mock/f40-build-2672653-67533/root/chroot_tmpdir/scmroot/libpoly'...
$ git fetch origin 0393f62d2bb948cbf88b5f19e730b627ba590491:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpoly
 * [new ref]         0393f62d2bb948cbf88b5f19e730b627ba590491 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0393f62 Stop building for 32-bit x86