From 1b24a1d614228b2919589d0d5ce91c18778a1119 Mon Sep 17 00:00:00 2001
From: Kristof Dhondt <kristofdho@gmail.com>
Date: Thu, 3 Aug 2023 00:06:32 +0200
Subject: [PATCH] set up basic support for copying files from the java.home
 directory to the build output

---
 .../com/oracle/svm/core/BuildArtifacts.java   |  4 +-
 .../oracle/svm/hosted/jdk/JDKConfigFiles.java | 86 +++++++++++++++++++
 2 files changed, 89 insertions(+), 1 deletion(-)
 create mode 100644 substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/jdk/JDKConfigFiles.java

diff --git a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/BuildArtifacts.java b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/BuildArtifacts.java
index c28733966d839..b375b587424ee 100644
--- a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/BuildArtifacts.java
+++ b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/BuildArtifacts.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -47,6 +47,8 @@ enum ArtifactType {
         JDK_LIBRARY("jdk_libraries"),
         /* For all library shims for the JDK needed at run-time. */
         JDK_LIBRARY_SHIM(JDK_LIBRARY.getJsonKey()), // distinction should not be important to users.
+        /* For all configuration files from java.home needed at run-time */
+        JDK_CONFIG_FILE("jdk_config"),
 
         /* Language home artifacts for Truffle languages needed at run-time. */
         LANGUAGE_HOME("language_home"),
diff --git a/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/jdk/JDKConfigFiles.java b/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/jdk/JDKConfigFiles.java
new file mode 100644
index 0000000000000..37f13434bca30
--- /dev/null
+++ b/substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/jdk/JDKConfigFiles.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2023, 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.svm.hosted.jdk;
+
+import com.oracle.svm.core.BuildArtifacts;
+import com.oracle.svm.core.feature.AutomaticallyRegisteredFeature;
+import com.oracle.svm.core.feature.InternalFeature;
+import com.oracle.svm.core.util.VMError;
+import org.graalvm.nativeimage.ImageSingletons;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Collections;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.concurrent.ConcurrentHashMap;
+
+import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
+
+public final class JDKConfigFiles {
+
+    public static JDKConfigFiles singleton() {
+        return ImageSingletons.lookup(JDKConfigFiles.class);
+    }
+
+    final Set<String> configFiles = Collections.newSetFromMap(new ConcurrentHashMap<>());
+
+    JDKConfigFiles() {
+    }
+
+    public void register(String configFile) {
+        if (configFile.startsWith("/")) {
+            configFiles.add(configFile.substring(1));
+        } else {
+            configFiles.add(configFile);
+        }
+    }
+}
+
+@AutomaticallyRegisteredFeature
+final class JDKConfigFilesFeature implements InternalFeature {
+    @Override
+    public void afterRegistration(AfterRegistrationAccess access) {
+        ImageSingletons.add(JDKConfigFiles.class, new JDKConfigFiles());
+    }
+
+    @Override
+    public void afterImageWrite(AfterImageWriteAccess access) {
+        Path jdkHomeDir = Path.of(System.getProperty("java.home")).normalize();
+        for (String configFile : new TreeSet<>(JDKConfigFiles.singleton().configFiles)) {
+            Path jdkConfigPath = jdkHomeDir.resolve(configFile).normalize();
+            VMError.guarantee(jdkConfigPath.startsWith(jdkHomeDir));
+            Path imageConfigPath = access.getImagePath().resolveSibling(configFile);
+            try {
+                Files.createDirectories(imageConfigPath);
+                Files.copy(jdkConfigPath, imageConfigPath, REPLACE_EXISTING);
+                BuildArtifacts.singleton().add(BuildArtifacts.ArtifactType.JDK_CONFIG_FILE, imageConfigPath);
+            } catch (IOException e) {
+                VMError.shouldNotReachHere(e);
+            }
+        }
+    }
+}