codex-log-guard

# Codex Log Guard

## Overview

Diagnose Codex persistent diagnostic logging from local evidence, then give a concise conclusion and the safest next action. Do not make the user choose from a command menu.

## Operating Contract

Select one mode from the current user request:

- `diagnose_only` is the default for check, inspect, explain, or verify requests. It is read-only.
- `protect` requires an explicit request to stop or mitigate log writes. It may install and verify `block_log_inserts`, but it does not delete rows or vacuum files.
- `cleanup` requires an explicit current request to reclaim disk space or clean up logs. It first installs protection when needed, creates and verifies a timestamped backup, and only then deletes log rows and vacuums.
- `restore` requires an explicit request to resume diagnostic logging. It may drop only the known `block_log_inserts` trigger.

Generic wording such as "处理", "修一下", or "止血" selects `protect`, not `cleanup`. Prior approval does not carry into a later run. If the requested write mode is ambiguous, return the `diagnose_only` report and the exact proposed mutation without applying it.

Direct actions:

- Run local read-only file, SQLite schema, row, and open-process checks.
- Apply only the mutation authorized by the selected mode and verify its result.

Escalate before:

- Touching any database outside the two declared Codex log paths, deleting a backup, killing a process, or changing remote telemetry or credentials.

Evidence-backed pushback:

- Reject cleanup when protection is unverified, the backup check failed, or sampled row IDs still move. Cite the exact database path and failed command instead of treating file size as proof.

Feedback loop:

- When a new schema, active path, or false-success signal is confirmed more than once, update this Skill's diagnosis rules and a focused contract test before automating that case.

`agents/openai.yaml` contains discovery UI metadata only; it is not an operational instruction source.

## Default Flow

When the user asks to "check", "看看", "诊断", or asks whether the local machine is affected:

1. Inspect all candidate live database files and schemas:
   - `~/.codex/logs_2.sqlite`
   - `~/.codex/sqlite/logs_2.sqlite`
2. Identify which candidate database is currently held by Codex processes.
3. Check whether `block_log_inserts` already exists on each candidate with a `logs` table.
4. Measure whether `logs` is still being written using `COUNT(*), MIN(id), MAX(id)` samples.
   Treat `MAX(id)` or `MIN(id)` movement with stable `COUNT(*)` as active churn, not necessarily disk growth.
4. Inspect low-level log volume with `TRACE`/`DEBUG` counts and top noisy targets.
5. Check which Codex processes currently hold each candidate database.
6. Return a diagnosis with:
   - current state: healthy / protected / affected historically / actively writing / actively growing on disk / missing database / blocked
   - evidence: file sizes, trigger state, row/min-id/max-id samples, level distribution, active path
   - recommended next action: do nothing / install trigger / cleanup later / cleanup now / restore logging
7. Do not ask the user which command to run. Choose the diagnosis path from the evidence.

In `protect` mode:

1. Install `block_log_inserts` first.
2. Verify that `COUNT(*), MAX(id)` stops growing.
3. Report the protected database path and fresh samples. Do not delete or vacuum rows.

In `cleanup` mode:

1. Complete and verify protection first.
2. Create a timestamped SQLite `.backup` and require a non-empty file plus a successful `PRAGMA quick_check` result.
3. Delete log rows, vacuum, and checkpoint the WAL.
4. Report the backup path and final file sizes.

In `restore` mode:

1. Drop `block_log_inserts`.
2. Sample `COUNT(*), MAX(id)` to confirm logging resumes or stays quiet.

## Evidence Commands

Run direct shell/SQLite commands. Use only the needed subset for the user's request; do not paste a menu back to the user.

Inspect files:

```bash
for db in ~/.codex/logs_2.sqlite ~/.codex/sqlite/logs_2.sqlite; do
  ls -lh "$db"* 2>/dev/null
  du -h "$db"* 2>/dev/null
done
```

After `lsof` identifies the active candidate, validate the selected path in the
same shell command before running any later SQLite snippet:

```bash
: "${CODEX_LOG_DB:?set CODEX_LOG_DB to the verified active candidate}"
case "$CODEX_LOG_DB" in
  "$HOME/.codex/logs_2.sqlite"|"$HOME/.codex/sqlite/logs_2.sqlite") ;;
  *) echo "refusing unexpected Codex log database path" >&2; exit 2 ;;
esac
readonly db="$CODEX_LOG_DB"
```

Do not supply a default. If no active path can be proven, stay in
`diagnose_only` and report the ambiguity.

Check schema and trigger:

```bash
sqlite3 "$db" ".tables"
sqlite3 "$db" "PRAGMA table_info(logs);"
sqlite3 "$db" "SELECT name, tbl_name, sql FROM sqlite_master WHERE type='trigger' AND name='block_log_inserts';"
```

Sample writes and growth:

```bash
for i in 1 2 3; do
  date '+%F %T'
  sqlite3 "$db" "SELECT COUNT(*) AS rows, MIN(id) AS min_id, MAX(id) AS max_id FROM logs;"
  stat -f '%N %z bytes mtime=%Sm' "$db" "$db-wal" "$db-shm" 2>/dev/null
  sleep 10
done
```

Inspect levels and noisy targets:

```bash
sqlite3 "$db" "SELECT level, COUNT(*) AS n, ROUND(SUM(estimated_bytes)/1024.0/1024.0, 1) AS estimated_mib FROM logs GROUP BY level ORDER BY n DESC;"
sqlite3 "$db" "SELECT target, level, COUNT(*) AS n, ROUND(SUM(estimated_bytes)/1024.0/1024.0, 1) AS estimated_mib FROM logs GROUP BY target, level ORDER BY n DESC LIMIT 15;"
```

Check open processes:

```bash
lsof ~/.codex/logs_2.sqlite ~/.codex/logs_2.sqlite-wal ~/.codex/logs_2.sqlite-shm \
     ~/.codex/sqlite/logs_2.sqlite ~/.codex/sqlite/logs_2.sqlite-wal ~/.codex/sqlite/logs_2.sqlite-shm 2>/dev/null
```

Install protection:

```bash
sqlite3 "$db" "PRAGMA busy_timeout=10000; CREATE TRIGGER IF NOT EXISTS block_log_inserts BEFORE INSERT ON logs BEGIN SELECT RAISE(IGNORE); END;"
```

Clean up after protection:

```bash
backup="$db.bak.$(date +%Y%m%d-%H%M%S)"
sqlit