Function load_dockerignore

crates/openshell-bootstrap/src/build.rs:340–363

Load and parse a `.dockerignore` file from the context directory. Returns an empty list if no `.dockerignore` exists.

(context_dir: &Path)

///
/// Returns an empty list if no `.dockerignore` exists.
fn load_dockerignore(context_dir: &Path) -> Vec<IgnorePattern> {
    let dockerignore_path = context_dir.join(".dockerignore");
    let Ok(contents) = std::fs::read_to_string(&dockerignore_path) else {
        return Vec::new();
    };

    contents
        .lines()
        .map(str::trim)
        .filter(|line| !line.is_empty() && !line.starts_with('#'))
        .map(|line| {
            line.strip_prefix('!').map_or_else(
                || IgnorePattern {
                    pattern: line.to_string(),
                    negated: false,
                },
                |rest| IgnorePattern {
                    pattern: rest.trim().to_string(),
                    negated: true,
                },
            )
        })
        .collect()
}

/// Check whether a relative path should be ignored based on `.dockerignore` patterns.
///