$ git clone -n https://src.fedoraproject.org/rpms/ghc-generics-sop.git /var/lib/mock/f40-build-742814-110925/root/chroot_tmpdir/scmroot/ghc-generics-sop
Cloning into '/var/lib/mock/f40-build-742814-110925/root/chroot_tmpdir/scmroot/ghc-generics-sop'...
$ git fetch origin be96affe848a2453a2acbd268ad43c3333764bb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-generics-sop
 * [new ref]         be96affe848a2453a2acbd268ad43c3333764bb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be96aff update to 0.5.1.3