$ git clone -n https://src.fedoraproject.org/rpms/mapserver.git /var/lib/mock/f40-build-2172963-51046/root/chroot_tmpdir/scmroot/mapserver
Cloning into '/var/lib/mock/f40-build-2172963-51046/root/chroot_tmpdir/scmroot/mapserver'...
$ git fetch origin e4691be9fd071d880107f6c0b3b56d4ca80618a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mapserver
 * [new ref]         e4691be9fd071d880107f6c0b3b56d4ca80618a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4691be Backport upstream patch for compilation with libxml2 2.12.0