50 lines
1.8 KiB
Java
50 lines
1.8 KiB
Java
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.jar.JarEntry;
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import java.util.jar.JarFile;
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import java.util.jar.JarOutputStream;
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import java.util.stream.Collectors;
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/**
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* Make a .jar file deterministic by sorting all entries by name, and setting all the last modified times to 0.
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* This makes the build 100% reproducible since the timestamp when you built it no longer affects the final file.
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* @author leijurv
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*/
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public class Determinizer {
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public static void main(String[] args) throws IOException {
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System.out.println("Input path: " + args[0] + " Output path: " + args[1]);
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JarFile jarFile = new JarFile(new File(args[0]));
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JarOutputStream jos = new JarOutputStream(new FileOutputStream(new File(args[1])));
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ArrayList<JarEntry> entries = jarFile.stream().collect(Collectors.toCollection(ArrayList::new));
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entries.sort(Comparator.comparing(JarEntry::getName));
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for (JarEntry entry : entries) {
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if (entry.getName().equals("META-INF/fml_cache_annotation.json")) {
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continue;
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}
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if (entry.getName().equals("META-INF/fml_cache_class_versions.json")) {
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continue;
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}
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JarEntry clone = new JarEntry(entry.getName());
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clone.setTime(0);
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jos.putNextEntry(clone);
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copy(jarFile.getInputStream(entry), jos);
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}
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jos.finish();
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jarFile.close();
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}
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public static void copy(InputStream is, OutputStream os) throws IOException {
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byte[] buffer = new byte[1024];
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int len;
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while ((len = is.read(buffer)) != -1) {
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os.write(buffer, 0, len);
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}
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}
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}
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