$ git clone -n https://src.fedoraproject.org/rpms/mcstrans.git /var/lib/mock/f40-build-750977-115699/root/chroot_tmpdir/scmroot/mcstrans
Cloning into '/var/lib/mock/f40-build-750977-115699/root/chroot_tmpdir/scmroot/mcstrans'...
$ git fetch origin 24949e23a28cc9121cc2530aa7cce5affd4db93b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mcstrans
 * [new ref]         24949e23a28cc9121cc2530aa7cce5affd4db93b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 24949e2 SELinux userspace 3.6-rc2 release