$ git clone -n https://src.fedoraproject.org/rpms/ghc-snap-server.git /var/lib/mock/f41-build-side-1-2955648-35550/root/chroot_tmpdir/scmroot/ghc-snap-server
Cloning into '/var/lib/mock/f41-build-side-1-2955648-35550/root/chroot_tmpdir/scmroot/ghc-snap-server'...
$ git fetch origin facadffc2208e50c6ae4055d01665234acc57998:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-snap-server
 * [new ref]         facadffc2208e50c6ae4055d01665234acc57998 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at facadff revise bounds