0.119.0 crashes if config.toml is readonly

What version of Codex CLI is running?

codex-cli 0.119.0

What subscription do you have?

Plus

Which model were you using?

_No response_

What platform is your computer?

_No response_

What terminal emulator and version are you using (if applicable)?

_No response_

What issue are you seeing?

Starting with 0.119.0, if using a config.toml that is readonly, then on startup, after being asked if you trust the directory, codex crashes when trying to save to the config file.

The error given is Error: thread/start failed during TUI bootstrap

In the logs, I see:

2026-04-13T03:43:25.266758Z ERROR codex_tui::onboarding::trust_directory: Failed to set project trusted: failed to persist config.toml at /home/dev/.dotfiles/.codex/config.toml

Caused by:
    Read-only file system (os error 30) at path "/home/dev/.dotfiles/.codex/.tmpdzATN7"

What steps can reproduce the bug?

• I'm running in a docker container with the config file mounted readonly, but you can probably reproduce this by changing the permissions on config.toml to be readonly.
• Launch codex on an untrusted directory
• When prompted, trust the directory
• Observe that the process crashes

What is the expected behavior?

Prior to 0.119.0, it would fail to persist the preference, but still continue and would be fully usable. I think that's better behavior in this case.

Additional information

_No response_