feat(errors): preserve jj-emitted errors when loading config

src/error.rs

@@ -18,8 +18,8 @@ pub enum Error {
     RepositoryLocked,
     #[error("Could not get current directory")]
     FailedGettingCurrentDir,
-    #[error("Could not load Jujutsu configuration")]
-    FailedReadingConfig,
+    #[error("Could not load Jujutsu configuration: {context}")]
+    FailedReadingConfig { context: String },
     // Application errors
     #[error("Operation cancelled by user")]
     Cancelled,

src/jj/lib_executor.rs

@@ -41,16 +41,22 @@ impl JjLib {
         let mut config = StackedConfig::with_defaults();
         for path in Self::user_config_paths() {
             if path.is_dir() {
-                config
-                    .load_dir(ConfigSource::User, &path)
-                    .map_err(|_| Error::FailedReadingConfig)?;
+                config.load_dir(ConfigSource::User, &path).map_err(|e| {
+                    Error::FailedReadingConfig {
+                        context: e.to_string(),
+                    }
+                })?;
             } else if path.exists() {
-                config
-                    .load_file(ConfigSource::User, path)
-                    .map_err(|_| Error::FailedReadingConfig)?;
+                config.load_file(ConfigSource::User, path).map_err(|e| {
+                    Error::FailedReadingConfig {
+                        context: e.to_string(),
+                    }
+                })?;
             }
         }
-        UserSettings::from_config(config).map_err(|_| Error::FailedReadingConfig)
+        UserSettings::from_config(config).map_err(|e| Error::FailedReadingConfig {
+            context: e.to_string(),
+        })
     }
 
     /// Resolves user config file paths following the same logic as the jj CLI:

src/main.rs

@@ -21,7 +21,7 @@ fn error_to_exit_code(error: &Error) -> i32 {
         Error::InvalidCommitMessage(_) => EXIT_ERROR,
         Error::NonInteractive => EXIT_ERROR,
         Error::FailedGettingCurrentDir => EXIT_ERROR,
-        Error::FailedReadingConfig => EXIT_ERROR,
+        Error::FailedReadingConfig { .. } => EXIT_ERROR,
     }
 }
 

tests/error_tests.rs

@@ -20,7 +20,9 @@ fn test_all_error_variants() {
     };
     let _repo_locked = Error::RepositoryLocked;
     let _failed_dir = Error::FailedGettingCurrentDir;
-    let _failed_config = Error::FailedReadingConfig;
+    let _failed_config = Error::FailedReadingConfig {
+        context: "test".to_string(),
+    };
 
     // Application errors
     let cancelled = Error::Cancelled;