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Eric Traut
713ae22c04
In a [recent PR](https://github.com/openai/codex/pull/9182), I made some improvements to config error messages so errors didn't leave app server clients in a dead state. This is a follow-on PR to make these error messages more readable and actionable for both TUI and GUI users. For example, see #9668 where the user was understandably confused about the source of the problem and how to fix it. The improved error message: 1. Clearly identifies the config file where the error was found (which is more important now that we support layered configs) 2. Provides a line and column number of the error 3. Displays the line where the error occurred and underlines it For example, if my `config.toml` includes the following: ```toml [features] collaboration_modes = "true" ``` Here's the current CLI error message: ``` Error loading config.toml: invalid type: string "true", expected a boolean in `features` ``` And here's the improved message: ``` Error loading config.toml: /Users/etraut/.codex/config.toml:43:23: invalid type: string "true", expected a boolean | 43 | collaboration_modes = "true" | ^^^^^^ ``` The bulk of the new logic is contained within a new module `config_loader/diagnostics.rs` that is responsible for calculating the text range for a given toml path (which is more involved than I would have expected). In addition, this PR adds the file name and text range to the `ConfigWarningNotification` app server struct. This allows GUI clients to present the user with a better error message and an optional link to open the errant config file. This was a suggestion from @.bolinfest when he reviewed my previous PR.
713ae22c04
·
2026-01-23 20:11:09 -08:00
History
codex-core config loader
This module is the canonical place to load and describe Codex configuration layers (user config, CLI/session overrides, managed config, and MDM-managed preferences) and to produce:
- An effective merged TOML config.
- Per-key origins metadata (which layer “wins” for a given key).
- Per-layer versions (stable fingerprints) used for optimistic concurrency / conflict detection.
Public surface
Exported from codex_core::config_loader:
load_config_layers_state(codex_home, cwd_opt, cli_overrides, overrides) -> ConfigLayerStackConfigLayerStackeffective_config() -> toml::Valueorigins() -> HashMap<String, ConfigLayerMetadata>layers_high_to_low() -> Vec<ConfigLayer>with_user_config(user_config) -> ConfigLayerStack
ConfigLayerEntry(one layer’s{name, config, version, disabled_reason};namecarries source metadata)LoaderOverrides(test/override hooks for managed config sources)merge_toml_values(base, overlay)(public helper used elsewhere)
Layering model
Precedence is top overrides bottom:
- MDM managed preferences (macOS only)
- System managed config (e.g.
managed_config.toml) - Session flags (CLI overrides, applied as dotted-path TOML writes)
- User config (
config.toml)
Layers with a disabled_reason are still surfaced for UI, but are ignored when
computing the effective config and origins metadata. This is what
ConfigLayerStack::effective_config() implements.
Typical usage
Most callers want the effective config plus metadata:
use codex_core::config_loader::{load_config_layers_state, LoaderOverrides};
use codex_utils_absolute_path::AbsolutePathBuf;
use toml::Value as TomlValue;
let cli_overrides: Vec<(String, TomlValue)> = Vec::new();
let cwd = AbsolutePathBuf::current_dir()?;
let layers = load_config_layers_state(
&codex_home,
Some(cwd),
&cli_overrides,
LoaderOverrides::default(),
).await?;
let effective = layers.effective_config();
let origins = layers.origins();
let layers_for_ui = layers.layers_high_to_low();
Internal layout
Implementation is split by concern:
state.rs: public types (ConfigLayerEntry,ConfigLayerStack) + merge/origins convenience methods.layer_io.rs: readingconfig.toml, managed config, and managed preferences inputs.overrides.rs: CLI dotted-path overrides → TOML “session flags” layer.merge.rs: recursive TOML merge.fingerprint.rs: stable per-layer hashing and per-key origins traversal.macos.rs: managed preferences integration (macOS only).