Make Unix launch scripts executable

Author: shartte

src/main/java/net/neoforged/moddevgradle/internal/CreateLaunchScriptTask.java

@@ -1,13 +1,5 @@
 package net.neoforged.moddevgradle.internal;
 
-import java.io.File;
-import java.io.IOException;
-import java.nio.charset.StandardCharsets;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import java.util.stream.Collectors;
-import javax.inject.Inject;
 import net.neoforged.moddevgradle.dsl.RunModel;
 import net.neoforged.moddevgradle.internal.utils.ExtensionUtils;
 import net.neoforged.moddevgradle.internal.utils.FileUtils;
@@ -27,6 +19,20 @@
 import org.gradle.api.tasks.TaskAction;
 import org.gradle.jvm.toolchain.JavaToolchainService;
 
+import javax.inject.Inject;
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.PosixFileAttributeView;
+import java.nio.file.attribute.PosixFilePermission;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.stream.Collectors;
+
 /**
  * Writes standalone start scripts to launch the game.
  * These scripts are useful for launching the game outside Gradle or the IDE, for example, from tools
@@ -190,10 +196,26 @@ private void writeLaunchScriptForUnix(List<String> javaCommand) throws IOExcepti
                 "(cd " + escapeShellArg(getWorkingDirectory().get()) + "; exec "
                         + javaCommand.stream().map(this::escapeShellArg).collect(Collectors.joining(" ")) + ")");
 
+        Path destination = getLaunchScript().get().getAsFile().toPath();
         FileUtils.writeStringSafe(
-                getLaunchScript().get().getAsFile().toPath(),
+                destination,
                 String.join("\n", lines),
                 StandardCharsets.UTF_8);
+
+        var permissionView = Files.getFileAttributeView(destination, PosixFileAttributeView.class);
+        if (permissionView != null) {
+            var perm = new HashSet<>(permissionView.readAttributes().permissions());
+            if (perm.contains(PosixFilePermission.OWNER_READ)) {
+                perm.add(PosixFilePermission.OWNER_EXECUTE);
+            }
+            if (perm.contains(PosixFilePermission.GROUP_READ)) {
+                perm.add(PosixFilePermission.GROUP_EXECUTE);
+            }
+            if (perm.contains(PosixFilePermission.OTHERS_READ)) {
+                perm.add(PosixFilePermission.OTHERS_EXECUTE);
+            }
+            permissionView.setPermissions(perm);
+        }
     }
 
     private String escapeShellArg(String text) {