Function create_build_context_tar

crates/openshell-bootstrap/src/build.rs:269–281

Create a tar archive of a directory for use as a Docker build context. Walks `context_dir` recursively, respects a `.dockerignore` file if present, and adds matching files with paths relative to the context root.

(context_dir: &Path)

/// Walks `context_dir` recursively, respects a `.dockerignore` file if present,
/// and adds matching files with paths relative to the context root.
fn create_build_context_tar(context_dir: &Path) -> Result<Vec<u8>> {
    let ignore_patterns = load_dockerignore(context_dir);

    let mut builder = tar::Builder::new(Vec::new());

    // Walk the directory tree and add entries, skipping ignored paths.
    walk_and_add(context_dir, context_dir, &ignore_patterns, &mut builder)?;

    builder
        .into_inner()
        .into_diagnostic()
        .wrap_err("failed to finalize build context tar")
}

/// Recursively walk a directory and add entries to a tar archive,
/// skipping paths that match `.dockerignore` patterns.