guix/gnu/packages/patches/openjdk-15-jtask-reproducibility.patch

--- 22kjr9lzrml0h5m55viq7zlfkqr9p7ny-openjdk-15.0.3-checkout/src/jdk.jlink/share/classes/jdk/tools/jmod/JmodTask.java.orig	2022-04-04 10:57:40.346312924 +0200
+++ 22kjr9lzrml0h5m55viq7zlfkqr9p7ny-openjdk-15.0.3-checkout/src/jdk.jlink/share/classes/jdk/tools/jmod/JmodTask.java	2022-04-04 11:01:38.480751902 +0200
@@ -82,6 +82,7 @@
 import jdk.internal.module.ModuleTarget;
 import jdk.internal.module.Resources;
 import jdk.tools.jlink.internal.Utils;
+import java.util.TreeSet;
 
 import static java.util.stream.Collectors.joining;
 
@@ -750,6 +751,7 @@
         void processSection(JmodOutputStream out, Section section, Path path)
             throws IOException
         {
+            TreeSet<Path> paths = new TreeSet<>();
             Files.walkFileTree(path, Set.of(FileVisitOption.FOLLOW_LINKS),
                 Integer.MAX_VALUE, new SimpleFileVisitor<Path>() {
                     @Override
@@ -765,14 +767,18 @@
                             if (out.contains(section, name)) {
                                 warning("warn.ignore.duplicate.entry", name, section);
                             } else {
-                                try (InputStream in = Files.newInputStream(file)) {
-                                    out.writeEntry(in, section, name);
-                                }
+                                paths.add(file);
                             }
                         }
                         return FileVisitResult.CONTINUE;
                     }
                 });
+
+            for (Path file : paths) {
+                try (InputStream in = Files.newInputStream(file)) {
+                    out.writeEntry(in, section, path.relativize(file).toString());
+                }
+            }
         }
 
         boolean matches(Path path, List<PathMatcher> matchers) {