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## Summary
Adds conditional dotenv overlays under `CODEX_HOME`. After loading the
current `.env`, Codex discovers `.env.*` files in lexicographic order
and applies each overlay when its TCP condition passes.
Evaluation and environment mutation occur during single-threaded
startup, before Codex creates its runtime, workers, sessions, or network
clients.
## Supported behavior
- TCP connectivity checks using either:
- Explicit `host` and `port`.
- A URL or authority stored in an overlay assignment referenced by
`from`.
- Direct negation of a TCP check using `not`.
- Setting dotenv assignments when a condition passes.
- Unsetting variables with `# codex-env-unset`.
- A default 500 ms connection timeout with a maximum of 5 seconds.
- Ignores filenames ending in `~` or a case-insensitive final suffix of
`bak`, `back`, `backup`, `bkp`, `old`, `orig`, `original`, `save`,
`saved`, `disable`, `disabled`, `inactive`, `off`, `tmp`, `temp`, `swp`,
`swo`, `example`, `sample`, `template`, or `dist`.
- Fail-closed handling of malformed overlays without exposing
environment values.
- Case-insensitive protection against setting or unsetting `CODEX_*`
variables.
Files without a `# codex-env-if:` directive as their first non-empty
line are ignored.
## Usage
Set variables when an endpoint is reachable:
```dotenv
# ~/.codex/.env.10-proxy-on
# codex-env-if: {"type":"tcp_connect","from":"HTTPS_PROXY","timeout_ms":500}
HTTPS_PROXY=http://proxy.example.com:8080
HTTP_PROXY=http://proxy.example.com:8080
ALL_PROXY=http://proxy.example.com:8080
NO_PROXY=localhost,127.0.0.1,.example.com
```
Unset variables when the endpoint is unreachable:
```dotenv
# ~/.codex/.env.20-proxy-off
# codex-env-if: {"not":{"type":"tcp_connect","host":"proxy.example.com","port":8080,"timeout_ms":500}}
# codex-env-unset: ["HTTPS_PROXY","HTTP_PROXY","ALL_PROXY","NO_PROXY"]
```
Each overlay is evaluated independently. A full Codex restart is
required after changing overlays or moving between networks.
The timeout bounds TCP connection attempts but does not bound
synchronous DNS resolution.
## Testing
```console
just test -p codex-arg0
```
For manual validation:
1. Configure an overlay with a reachable TCP endpoint and a test
assignment.
2. Start Codex and verify the assignment is present in a spawned
command.
3. Restart Codex with the endpoint unreachable and verify a negated
overlay removes inherited variables.
4. Verify malformed overlays are skipped and `CODEX_*` variables remain
unchanged.
## Future ideas:
- File-existence conditions.
- Environment-variable equality conditions.
- Operating-system conditions.
- General condition composition with `all`, `any`, and arbitrarily
nested `not`.