openai/codex · error · anyhow::Error

credentials path is not a regular file

Error message

credentials path is not a regular file

What it means

Error "credentials path is not a regular file" thrown in openai/codex.

Source

Thrown at codex-rs/rmcp-client/src/oauth.rs:1040

fn open_fallback_file_for_write(path: &std::path::Path) -> Result<fs::File> {
    let mut options = fs::OpenOptions::new();
    options.write(true).create(true).truncate(false);
    #[cfg(unix)]
    {
        use std::os::unix::fs::OpenOptionsExt;
        options
            .mode(0o600)
            .custom_flags(libc::O_NOFOLLOW | libc::O_NONBLOCK);
    }
    #[cfg(windows)]
    {
        use std::os::windows::fs::OpenOptionsExt;
        use windows_sys::Win32::Storage::FileSystem::FILE_FLAG_OPEN_REPARSE_POINT;
        options.custom_flags(FILE_FLAG_OPEN_REPARSE_POINT);
    }
    let file = options.open(path)?;
    anyhow::ensure!(
        file.metadata()?.is_file(),
        "credentials path is not a regular file"
    );
    Ok(file)
}

fn write_fallback_file(store: &FallbackFile) -> Result<()> {
    let path = fallback_file_path()?;

    if store.is_empty() {
        if path.exists() {
            fs::remove_file(path)?;
        }
        return Ok(());
    }

    let parent = path
        .parent()

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/rmcp-client/src/oauth.rs:1040 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/0d26ec1e7e6eb40c. Report an issue: GitHub.