writeFile(rootsDir + "/" + baseNameOf(path), "");

            addRoot(path);

void State::addRoot(const Path & storePath)
{
    auto root = rootsDir + "/" + baseNameOf(storePath);
    if (!pathExists(root)) writeFile(root, "");
}

    addRoot("/nix/store/rk9lahzm21qm0zjclv6mz0m4hy77wk14-vm-test-run-unnamed.drv");

                writeFile(rootsDir + "/" + baseNameOf(path), "");

                addRoot(path);

    void addRoot(const nix::Path & storePath);