vectordotdev/vector · error

Failed to get file_name for

Error message

Failed to get file_name for {entry_path:?}

What it means

For each subdirectory entry, walk_dir_and_convert derives the mirrored output directory name via Path::file_name(). file_name() returns None only for paths ending in '..' or the root, so this panic indicates the entry path resolved to such a degenerate form.

Solutions

1. Inspect the directory tree for entries named or linking to '..' (`find . -name '..' -o -type l`)
2. Canonicalize paths before walking (std::fs::canonicalize) so file_name() is well-defined
3. Patch the walker to skip entries whose file_name() is None instead of panicking

Example fix

// before
.unwrap_or_else(|| panic!("Failed to get file_name for {entry_path:?}"));
// after
let last_component = match entry_path.file_name() {
    Some(name) => name,
    None => continue, // skip degenerate paths like '..' or root
};

fn has_file_name(p: &std::path::Path) -> bool { p.file_name().is_some() }

fn base_name(p: &std::path::Path) -> Option<String> { p.file_name().map(|s| s.to_string_lossy().into_owned()) }

When it happens

Trigger: An entry path whose last component is '..' — e.g. a directory containing a '..' symlinked entry or the walker itself being invoked on path components that normalize to the root, making file_name() return None.

Common situations: Symlink loops or entries pointing at parent directories in unusual directory layouts; input trees generated by scripts that create '..' entries or paths terminated with '/../'.

Understand the failure class

Background: Path traversal blocked: "path escapes the workspace" and "outside site root" errors when a path will not stay inside its allowed directory — this error's family across 26 libraries.

Related errors

• Failed to get extension for
• Failed to bind to listener socket at path
• Failed to create output dir
• Failed to create output dir(s)
• Failed to get entry for dir

AI-assisted analysis of vectordotdev/vector@bdb87aeaa4 (2026-09-16). Data as JSON: /api/errors/5c958a4a1f084851. Report an issue: GitHub.

Appendix: source

Thrown at src/convert_config.rs:163

fn walk_dir_and_convert(
    input_path: &Path,
    output_dir: &Path,
    output_format: Format,
) -> Result<(), Vec<String>> {
    let mut errors = Vec::new();

    if input_path.is_dir() {
        for entry in fs::read_dir(input_path)
            .unwrap_or_else(|_| panic!("Failed to read dir: {input_path:?}"))
        {
            let entry_path = entry
                .unwrap_or_else(|_| panic!("Failed to get entry for dir: {input_path:?}"))
                .path();
            let new_output_dir = if entry_path.is_dir() {
                let last_component = entry_path
                    .file_name()
                    .unwrap_or_else(|| panic!("Failed to get file_name for {entry_path:?}"));
                let new_dir = output_dir.join(last_component);

                if !new_dir.exists() {
                    fs::create_dir_all(&new_dir)
                        .unwrap_or_else(|_| panic!("Failed to create output dir: {new_dir:?}"));
                }
                new_dir
            } else {
                output_dir.to_path_buf()
            };

            if let Err(new_errors) = walk_dir_and_convert(
                &input_path.join(&entry_path),
                &new_output_dir,
                output_format,
            ) {
                errors.extend(new_errors);
            }

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