vallum 0.8.4

Security boundary between AI coding agents and your shell — redacts secrets, neutralizes prompt injection, sanitizes untrusted terminal output, audits every command.
Documentation 
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//! Private (`0600`) append-file helper shared by the audit and stats writers.

use std::fs::{File, OpenOptions};
use std::path::Path;

/// Open a file for append, creating it with owner-only (0600) permissions on unix.
/// `.mode()` only affects newly created files, so existing files keep their perms.
#[cfg(unix)]
pub fn open_append_private(path: &Path) -> std::io::Result<File> {
    use std::os::unix::fs::OpenOptionsExt;
    OpenOptions::new()
        .create(true)
        .append(true)
        .mode(0o600)
        .open(path)
}

#[cfg(not(unix))]
pub fn open_append_private(path: &Path) -> std::io::Result<File> {
    OpenOptions::new().create(true).append(true).open(path)
}

#[cfg(all(test, unix))]
mod tests {
    use super::*;
    use std::os::unix::fs::PermissionsExt;

    #[test]
    fn creates_file_with_0600() {
        let dir = std::env::temp_dir().join(format!(
            "vallum_fsutil_{}",
            std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .unwrap()
                .as_nanos()
        ));
        std::fs::create_dir_all(&dir).unwrap();
        let path = dir.join("f.log");
        let _ = open_append_private(&path).unwrap();
        let mode = std::fs::metadata(&path).unwrap().permissions().mode();
        assert_eq!(mode & 0o777, 0o600);
        let _ = std::fs::remove_dir_all(&dir);
    }
}