improve config parse errors, fix nixosModules field for stations

crates/backend/src/config.rs

@@ -88,16 +88,16 @@ impl Default for Config {
 impl std::str::FromStr for Config {
     type Err = ConfigError;
     fn from_str(s: &str) -> Result<Self, ConfigError> {
-        toml::from_str(s).map_err(|_| ConfigError::Parse)
+        toml::from_str(s).map_err(ConfigError::Parse)
     }
 }
 
 #[derive(Debug)]
 pub enum ConfigError {
-    Parse,
+    Parse(toml::de::Error),
     StringParse,
-    Serialize,
-    IO,
+    Serialize(toml::ser::Error),
+    IO(std::io::Error),
 }
 
 impl std::error::Error for ConfigError {}
@@ -105,23 +105,23 @@ impl std::error::Error for ConfigError {}
 impl std::fmt::Display for ConfigError {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         match self {
-            Self::Parse => write!(f, "Failed to parse Config from string"),
+            Self::Parse(e) => write!(f, "Failed to parse Config from string: {}", e),
             Self::StringParse => write!(f, "Failed to parse environment variable"),
-            Self::Serialize => write!(f, "Failed to serialize Config to TOML"),
-            Self::IO => write!(f, "Failed to write a configuration file"),
+            Self::Serialize(e) => write!(f, "Failed to serialize Config to TOML: {}", e),
+            Self::IO(e) => write!(f, "Failed to read or write a configuration file: {}", e),
         }
     }
 }
 
 impl From<toml::ser::Error> for ConfigError {
-    fn from(_: toml::ser::Error) -> Self {
-        ConfigError::Serialize
+    fn from(err: toml::ser::Error) -> Self {
+        ConfigError::Serialize(err)
     }
 }
 
 impl From<std::io::Error> for ConfigError {
-    fn from(_: std::io::Error) -> Self {
-        ConfigError::IO
+    fn from(err: std::io::Error) -> Self {
+        ConfigError::IO(err)
     }
 }
 

flake.nix

@@ -276,7 +276,7 @@
                     type = types.str;
                     description = "Station name";
                   };
-                  address = mkOption {
+                  host = mkOption {
                     type = types.str;
                     description = "MPD service address";
                   };
@@ -339,7 +339,7 @@
                   ${toTOML {inherit (cfg) base server stations;}}
                 '';
               in ''
-                ln -sf ${configFile} ./config.toml
+                ln -sf ${configFile} ${cfg.dataDir}/config.toml
               '';
             };
           };
@@ -367,7 +367,7 @@
               {
                 id = "test";
                 name = "Test";
-                address = "127.0.0.1";
+                host = "127.0.0.1";
                 port = 8080;
               }
             ];