$ git clone -n https://src.fedoraproject.org/rpms/metamath.git /var/lib/mock/f40-build-2255819-54266/root/chroot_tmpdir/scmroot/metamath
Cloning into '/var/lib/mock/f40-build-2255819-54266/root/chroot_tmpdir/scmroot/metamath'...
$ git fetch origin 64caf7a7bcfaeccb34c576fb55047781b2d77809:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/metamath
 * [new ref]         64caf7a7bcfaeccb34c576fb55047781b2d77809 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64caf7a Stop building for 32-bit x86