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codex/codex-rs/app-server/src
T
Eric Traut a73403a890 Make missing config clears no-ops (#20334)
## Why

Fixes #20145.

`config/value/write` treats a JSON `null` value as a request to clear
the config key. Clearing a key that is already absent should be
idempotent, but clearing a nested key such as `features.personality`
from an empty `config.toml` returned `configPathNotFound` because
`clear_path` treated the missing `features` parent table as an error.

That makes app-server reset flows brittle because clients have to read
first and avoid sending a clear request unless the parent path already
exists.

## What Changed

- Updated app-server config clearing so missing intermediate tables, or
non-table parents, are treated as an unchanged no-op.
- Removed the now-unreachable `MergeError::PathNotFound` path from
config write merging.
- Added a regression test covering `features.personality = null` against
an empty user config.

## Verification

- `cargo test -p codex-app-server clear_missing_nested_config_is_noop`
- `cargo test -p codex-app-server` was run; the config manager unit
suite passed, but one unrelated integration test failed because
`turn_start_emits_thread_scoped_warning_notification_for_trimmed_skills`
expected `7` trimmed skills and observed `8`.
- `just fix -p codex-app-server`
a73403a890 ยท 2026-04-30 10:13:33 +02:00
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