OCI Image Packaging

/**
 * Create a new ImagePackager instance
 * @param source the source file to package
 * @param backupFile the backup of the source file to package
 */
public ImagePackager(File source, File backupFile);

/**
 * Create a packaged image using a custom exporter
 * @param libraries the contained libraries
 * @param exporter the exporter used to write the image
 * @throws IOException on IO error
 */
public void packageImage(Libraries libraries, BiConsumer<ZipEntry, EntryWriter> exporter) throws IOException;

import org.springframework.boot.loader.tools.ImagePackager;
import org.springframework.boot.loader.tools.Libraries;
import org.springframework.boot.loader.tools.EntryWriter;
import java.io.File;
import java.util.zip.ZipEntry;
import java.util.function.BiConsumer;

// Create image packager with source and backup
File sourceJar = new File("myapp.jar");
File backupJar = new File("myapp.jar.original");
ImagePackager imagePackager = new ImagePackager(sourceJar, backupJar);

// Export to OCI image format
Libraries libraries = /* ... define libraries ... */;
BiConsumer<ZipEntry, EntryWriter> exporter = (entry, writer) -> {
    // Custom logic to write entries to OCI image layers
    System.out.println("Exporting: " + entry.getName());
    // writer.write(outputStream) to write the entry content
};

imagePackager.packageImage(libraries, exporter);

public interface EntryWriter {
    void write(OutputStream outputStream) throws IOException;
    default int size() { return -1; }
}