$ git clone -n https://src.fedoraproject.org/rpms/alt-ergo.git /var/lib/mock/f40-build-793112-138788/root/chroot_tmpdir/scmroot/alt-ergo
Cloning into '/var/lib/mock/f40-build-793112-138788/root/chroot_tmpdir/scmroot/alt-ergo'...
$ git fetch origin bd0a00952534e977b2063fa4b8604bd363d96541:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alt-ergo
 * [new ref]         bd0a00952534e977b2063fa4b8604bd363d96541 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd0a009 Rebuild for changed ocamlx(Dynlink) hash