$ git clone -n https://src.fedoraproject.org/rpms/httpd.git /var/lib/mock/f40-build-762250-121856/root/chroot_tmpdir/scmroot/httpd
Cloning into '/var/lib/mock/f40-build-762250-121856/root/chroot_tmpdir/scmroot/httpd'...
$ git fetch origin af4e8a43b66a9ed63903c84ca4b9be765bda87a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/httpd
 * [new ref]         af4e8a43b66a9ed63903c84ca4b9be765bda87a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af4e8a4 Note build fix.