$ git clone -n https://src.fedoraproject.org/rpms/ghc-json.git /var/lib/mock/f40-build-2055434-49118/root/chroot_tmpdir/scmroot/ghc-json
Cloning into '/var/lib/mock/f40-build-2055434-49118/root/chroot_tmpdir/scmroot/ghc-json'...
$ git fetch origin d850dca82032a55c20b96d89daf5301194a00d7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-json
 * [new ref]         d850dca82032a55c20b96d89daf5301194a00d7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d850dca bump release