nixos-configs/nixosModules/esphome-plus/default.nix

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{
config,
lib,
pkgs,
...
}: let
inherit
(lib)
concatMapStringsSep
converge
elem
filterAttrsRecursive
getExe
mapAttrsToList
mkForce
mkIf
mkOption
optionalAttrs
optionals
optionalString
types
;
cfg = config.services.esphome;
stateDir = "/var/lib/private/esphome";
esphomeParams =
if cfg.enableUnixSocket
then "--socket /run/esphome/esphome.sock"
else "--address ${cfg.address} --port ${toString cfg.port}";
format = pkgs.formats.yaml {};
# Adapted from https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/home-automation/home-assistant.nix
mkESPConf = name: cfg: let
filteredConfig = converge (filterAttrsRecursive (_: v: ! elem v [null])) cfg;
in {
name = "${name}.yaml";
file = pkgs.runCommandLocal "${name}.yaml" {} ''
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cp ${format.generate name filteredConfig} $out
sed -i -e "s/'\!\([a-z_]\+\) \(.*\)'/\!\1 \2/;s/^\!\!/\!/;" $out
sed -i 's/ {}//g' $out
'';
};
in {
options.services.esphome = {
firmwareConfigs = mkOption {
default = {};
type = with types; attrsOf anything;
};
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secretsFile = mkOption {
default = null;
type = types.nullOr types.path;
};
deleteUnmanaged = mkOption {
default = true;
type = types.bool;
};
};
config = mkIf (cfg.enable) {
# FIXME: https://github.com/NixOS/nixpkgs/issues/339557
systemd.services.esphome = {
environment.PLATFORMIO_CORE_DIR = mkForce "${stateDir}/.platformio";
serviceConfig =
(optionalAttrs (cfg.firmwareConfigs != {}) {
ExecStartPre = getExe (pkgs.writeShellApplication {
name = "esphome-exec-start-pre";
runtimeInputs = optionals cfg.deleteUnmanaged [
pkgs.findutils
];
text = ''
if [[ ! -d ${stateDir} ]]; then
mkdir -p ${stateDir}
fi
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${optionalString (cfg.secretsFile != null) ''cp -f "$(realpath "${cfg.secretsFile}")" ${stateDir}/secrets.yaml''}
${optionalString cfg.deleteUnmanaged ''find ${stateDir} -name "*.yaml" ! -name "secrets.yaml" -delete''}
${concatMapStringsSep
"\n"
(dev: ''cp -f "$(realpath "${dev.file}")" ${stateDir}/"${dev.name}"'')
(mapAttrsToList mkESPConf cfg.firmwareConfigs)}
'';
});
})
// {
ExecStart = mkForce "${cfg.package}/bin/esphome dashboard ${esphomeParams} ${stateDir}";
WorkingDirectory = mkForce stateDir;
};
};
};
}