nixos/home-assistant: escape yaml functions in lovelace config (#352746)

  cfg = config.services.home-assistant;

  format = pkgs.formats.yaml {};

  # Render config attribute sets to YAML

  # Values that are null will be filtered from the output, so this is one way to have optional

  # options shown in settings.

  # We post-process the result to add support for YAML functions, like secrets or includes, see e.g.

  # Post-process YAML output to add support for YAML functions, like

  # secrets or includes, by naively unquoting strings with leading bangs

  # and at least one space-separated parameter.

  # https://www.home-assistant.io/docs/configuration/secrets/

  filteredConfig = lib.converge (lib.filterAttrsRecursive (_: v: ! elem v [ null ])) (lib.recursiveUpdate customLovelaceModulesResources (cfg.config or {}));

  configFile = pkgs.runCommandLocal "configuration.yaml" { } ''

    cp ${format.generate "configuration.yaml" filteredConfig} $out

  renderYAMLFile = fn: yaml: pkgs.runCommandLocal fn { } ''

    cp ${format.generate fn yaml} $out

    sed -i -e "s/'\!\([a-z_]\+\) \(.*\)'/\!\1 \2/;s/^\!\!/\!/;" $out

  '';

  lovelaceConfigFile = format.generate "ui-lovelace.yaml" cfg.lovelaceConfig;

  # Filter null values from the configuration, so that we can still advertise

  # optional options in the config attribute.

  filteredConfig = lib.converge (lib.filterAttrsRecursive (_: v: ! elem v [ null ])) (lib.recursiveUpdate customLovelaceModulesResources (cfg.config or {}));

  configFile = renderYAMLFile "configuration.yaml" filteredConfig;

  lovelaceConfigFile = renderYAMLFile "ui-lovelace.yaml" cfg.lovelaceConfig;

  # Components advertised by the home-assistant package

  availableComponents = cfg.package.availableComponents;