fix: keep Docker-set variables when the WebUI saves settings, and name the ones it can't apply by chodeus · Pull Request #316 · chodeus/BeatsCheck

chodeus · 2026-10-15T07:10:45Z

Summary

The Settings form posts every field, and a save copied each one straight into os.environ. A value set by a Docker variable was meant to win over beatscheck.conf, and the config reload already skips those. But the save overwrote them in the running process. With -e MODE=report, saving only a new Lidarr URL also posted the file's mode = setup, and the container stopped scanning until it restarted. After the restart, Docker's value came back.

Now:

_sync_env_from_config_file (new, in main.py) holds the precedence rule. It copies beatscheck.conf into os.environ for every key a Docker variable doesn't set, and returns the keys whose saved value a Docker variable overrides.
_reload_config calls it, so its behaviour is unchanged except for a missing file (below).
The WebUI save calls it after writing the file, in place of its own copy loop. Deletes read the Lidarr settings from os.environ, so a saved Lidarr URL still applies at once. The reply now carries docker_set: the overridden keys among the ones this save posted (names only, never values). A conflict left from an earlier save isn't named.
If beatscheck.conf is gone or can't be read when the save reads it back, the save replies with a 500 error. It no longer reports ok for settings it didn't apply. A missing file now counts as unreadable in the helper, so the config reload also leaves cfg alone in that case.
Read-backs run one at a time under a lock in _sync_env_from_config_file, for the save and the config reload alike. Before, a read that started first could copy an older file into os.environ after a newer save had applied. Each save reads the file back after its own write, so the last read-back applies the newest file.
_load_config now records the variables set at startup before it picks a startup path. Before, only the Docker path recorded them. With the path-argument start under "Without Docker" in docs/installation.md (MODE=report … python3 app/main.py <music> <quarantine> <log>), the first reload let a beatscheck.conf beside the log replace MODE=report.
The Settings page shows Configuration saved. Set by a Docker variable, so not applied: mode as a warning toast when that list isn't empty.

docs/configuration.md said a value saved in the WebUI overrides the environment variable until the container restarts. It now says variables win over WebUI saves too, that the save says so, and that the saved value applies once you remove the variable and recreate the container.

Testing

New tests/test_config_save_env.py (8 tests, 10 cases) runs the WebUI server with the login off and MODE=report set as a Docker variable, with os.environ replaced for the test.
- Saving mode = setup with a Lidarr URL leaves MODE at report and names mode in the reply.
- A setting no variable sets is in os.environ straight after the save.
- A Docker-set key the save agrees with isn't named, and nor is a conflict in a key the save didn't post.
- A save whose file can't be read back, or is gone, replies with a 500 and applies nothing.
- A read-back paused after it read the file (a save's, or the reload's) doesn't overwrite a newer save that runs meanwhile.
- The config reload keeps a Docker-set MODE over the file, for the Docker start and the path-argument start.
On the old code, 8 of the 10 cases fail; the other two (save applies at once, the Docker start's reload keeps Docker's value) are guards for behaviour that already worked.
Each test was checked against a mutation of the code it covers; 9 of 10 mutations were caught. The survivor drops the reload's early return when beatscheck.conf is missing or can't be read; the refresh that then runs reads an unchanged environment, so it behaves the same.
Full suite: 389 passed. flake8, ruff and node --check clean.

Summary by CodeRabbit

Bug Fixes
- Environment variables retain precedence over conflicting values saved in the WebUI, and save confirmations identify settings controlled by the environment that were not applied.
- Saved values apply after the corresponding environment variable is removed and the container is recreated.
- Configuration saves report an error if saved settings cannot be read back. Reloads preserve environment-controlled values when they conflict with saved settings.
Documentation
- Clarified how environment variables and WebUI-saved settings interact.

…e the ones it can't apply

coderabbitai · 2026-10-15T07:10:55Z

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app/main.py
app/static/app.js
app/webui.py
docs/configuration.md
tests/test_config_save_env.py

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📝 Walkthrough

Configuration loading and WebUI saves now preserve Docker-set environment values. Save responses identify submitted settings that differ from Docker values, and the UI displays those settings.

Changes: Configuration Environment Precedence

Layer / File(s)	Summary
Environment synchronization and reload `app/main.py`, `tests/test_config_save_env.py`	`_load_config` records Docker-set variables before configuration initialization. `_sync_env_from_config_file` updates only variables not recorded as Docker-set and returns config keys that differ from Docker values. `_reload_config` uses the helper and does not refresh `cfg` if the config file cannot be read. Reload tests check that a Docker-set value remains in effect.
WebUI save synchronization and reporting `app/webui.py`, `app/static/app.js`, `tests/test_config_save_env.py`, `docs/configuration.md`	After a successful config-file write, the handler synchronizes environment values and includes submitted overridden settings in `docker_set`. The UI warns when that list is non-empty. Tests cover conflicting and matching values, an unrelated setting, readback failures, and concurrent saves. The documentation describes environment-variable precedence.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Browser
  participant ConfigSaveHandler
  participant SyncEnv as _sync_env_from_config_file
  participant Environment as os.environ
  Browser->>ConfigSaveHandler: submit configuration
  ConfigSaveHandler->>ConfigSaveHandler: write config file
  ConfigSaveHandler->>SyncEnv: synchronize values
  SyncEnv->>Environment: apply values not set by Docker
  SyncEnv-->>ConfigSaveHandler: return Docker-overridden keys
  ConfigSaveHandler-->>Browser: return docker_set
  Browser->>Browser: show warning or success notification

Merge Risk: ⚪ Minimal · up to a031c

No actionable issue is established for the configuration-save changes; they appear mergeable after normal checks.

Pre-merge checks: 4

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title uses the required Conventional Commits format and accurately describes the behavioral fix. The `fix` type matches the changes that preserve Docker-set variables and report unapplied settings…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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chodeus · 2026-10-15T08:04:31Z

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coderabbitai · 2026-10-15T08:04:38Z

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Inline comments:
Review comments at @app/webui.py:
- Around line 1227-1228: Update the save flow around _sync_env_from_config_file
to return an error instead of reporting success when synchronization returns
None, and remove the fallback that masks this failure. Update
_parse_config_lines or its caller so an absent config file is distinguishable
from a readable empty file, preserving the appropriate synchronization behavior
for each.

Review comments at @docs/configuration.md:
- Line 26: Update the environment-variable precedence sentence in the
configuration documentation to state that after removing an overriding Docker
variable, the container must be restarted or recreated before the saved WebUI
value takes effect.

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… back

chodeus · 2026-10-15T09:10:10Z

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Inline comments:
Review comments at @app/main.py:
- Around line 3420-3421: Update the three-positional-argument startup path in
_load_config() to call _snapshot_docker_env() before the first reload, so
Docker-provided keys are recorded in _docker_env_vars and this branch does not
overwrite them. Ensure both startup paths capture Docker-set keys before
reloading configuration.

Review comments at @app/webui.py:
- Line 1232: Filter `overridden` to include only keys present in `updates`
before returning it as `docker_set` in the JSON response, so the response
reports only overrides associated with settings saved by this request.

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…verrides a save posted

chodeus · 2026-10-15T10:16:06Z

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Inline comments:
Review comments at @app/webui.py:
- Line 1227: In the config-save handler, keep _write_config_file and the
subsequent _sync_env_from_config_file call in one _config_write_lock critical
section so concurrent requests cannot apply stale configuration. Because
_write_config_file already acquires the lock, make it reentrant or move lock
ownership to the caller.

Review comments at @tests/test_config_save_env.py:
- Line 29: Replace the socket-based transport used by the `/api/config` requests
in the test around `WebUIHandler` with a test-local stub that dispatches
requests directly to `WebUIHandler` without opening a network connection.
Preserve the existing response assertions.

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… can't land after a newer save

chodeus · 2026-10-15T11:22:31Z

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coderabbitai · 2026-10-15T11:22:38Z

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fix: keep Docker-set variables when the WebUI saves settings, and nam…

56ac620

…e the ones it can't apply

coderabbitai Bot reviewed Oct 15, 2026

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Comment thread app/webui.py Resolved

Comment thread docs/configuration.md Resolved

fix: reply with an error when a WebUI save can't read beatscheck.conf…

51c38be

… back

coderabbitai Bot reviewed Oct 15, 2026

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Comment thread app/main.py Resolved

Comment thread app/webui.py Resolved

fix: keep variables set at a path-argument start, and name only the o…

c6a96c6

…verrides a save posted

coderabbitai Bot reviewed Oct 15, 2026

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Comment thread app/webui.py Resolved

Comment thread tests/test_config_save_env.py Resolved

fix: apply beatscheck.conf read-backs one at a time, so an older read…

a031c04

… can't land after a newer save

chodeus merged commit 220f81f into main Oct 15, 2026
14 checks passed

chodeus deleted the fix/webui-save-keeps-docker-env branch October 15, 2026 11:27

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