$ git clone -n https://src.fedoraproject.org/rpms/ghc-snap-server.git /var/lib/mock/f39-build-2012026-45761/root/chroot_tmpdir/scmroot/ghc-snap-server
Cloning into '/var/lib/mock/f39-build-2012026-45761/root/chroot_tmpdir/scmroot/ghc-snap-server'...
$ git fetch origin 7cd65ebfe1c483581c54c78456d78a1f8ed3bb4b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-snap-server
 * [new ref]         7cd65ebfe1c483581c54c78456d78a1f8ed3bb4b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7cd65eb update to 1.1.2.1