Function copy_tree

tests/mcp_suite/fixture.rs:348–361

Recursively copies `src` into `dest`, preserving file mtimes so the staleness pipeline sees copied sources exactly as the template indexed them.

(src: &Path, dest: &Path)

/// staleness pipeline sees copied sources exactly as the template indexed
/// them.
fn copy_tree(src: &Path, dest: &Path) -> io::Result<()> {
    fs::create_dir_all(dest)?;
    for entry in fs::read_dir(src)? {
        let entry = entry?;
        let from = entry.path();
        let to = dest.join(entry.file_name());
        if entry.file_type()?.is_dir() {
            copy_tree(&from, &to)?;
        } else {
            copy_file_preserving_mtime(&from, &to)?;
        }
    }
    Ok(())
}

fn copy_file_preserving_mtime(src: &Path, dest: &Path) -> io::Result<()> {
    fs::copy(src, dest)?;