openai/codex · error · std::io::Error

failed to read CODEX_HOME {val:?}: {err}

Error message

failed to read CODEX_HOME {val:?}: {err}

What it means

Error "failed to read CODEX_HOME {val:?}: {err}" thrown in openai/codex.

Source

Thrown at codex-rs/utils/home-dir/src/lib.rs:31

pub fn find_codex_home() -> std::io::Result<AbsolutePathBuf> {
    let codex_home_env = std::env::var("CODEX_HOME")
        .ok()
        .filter(|val| !val.is_empty());
    find_codex_home_from_env(codex_home_env.as_deref())
}

fn find_codex_home_from_env(codex_home_env: Option<&str>) -> std::io::Result<AbsolutePathBuf> {
    // Honor the `CODEX_HOME` environment variable when it is set to allow users
    // (and tests) to override the default location.
    match codex_home_env {
        Some(val) => {
            let path = PathBuf::from(val);
            let metadata = std::fs::metadata(&path).map_err(|err| match err.kind() {
                std::io::ErrorKind::NotFound => std::io::Error::new(
                    std::io::ErrorKind::NotFound,
                    format!("CODEX_HOME points to {val:?}, but that path does not exist"),
                ),
                _ => std::io::Error::new(
                    err.kind(),
                    format!("failed to read CODEX_HOME {val:?}: {err}"),
                ),
            })?;

            if !metadata.is_dir() {
                Err(std::io::Error::new(
                    std::io::ErrorKind::InvalidInput,
                    format!("CODEX_HOME points to {val:?}, but that path is not a directory"),
                ))
            } else {
                let canonical = path.canonicalize().map_err(|err| {
                    std::io::Error::new(
                        err.kind(),
                        format!("failed to canonicalize CODEX_HOME {val:?}: {err}"),
                    )
                })?;
                AbsolutePathBuf::from_absolute_path(canonical)

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/utils/home-dir/src/lib.rs:31 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/624bd3c388e7cdbf. Report an issue: GitHub.