Paper/nms-patches/PropertyManager.patch

--- a/net/minecraft/server/PropertyManager.java
+++ b/net/minecraft/server/PropertyManager.java
@@ -8,6 +8,8 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+import joptsimple.OptionSet; // CraftBukkit
+
 public class PropertyManager {
 
     private static final Logger a = LogManager.getLogger();
@@ -42,6 +44,24 @@
 
     }
 
+    // CraftBukkit start
+    private OptionSet options = null;
+
+    public PropertyManager(final OptionSet options) {
+        this((File) options.valueOf("config"));
+
+        this.options = options;
+    }
+
+    private <T> T getOverride(String name, T value) {
+        if ((this.options != null) && (this.options.has(name))) {
+            return (T) this.options.valueOf(name);
+        }
+
+        return value;
+    }
+    // CraftBukkit end
+
     public void a() {
         PropertyManager.a.info("Generating new properties file");
         this.savePropertiesFile();
@@ -51,6 +71,12 @@
         FileOutputStream fileoutputstream = null;
 
         try {
+            // CraftBukkit start - Don't attempt writing to file if it's read only
+            if (this.file.exists() && !this.file.canWrite()) {
+                return;
+            }
+            // CraftBukkit end
+
             fileoutputstream = new FileOutputStream(this.file);
             this.properties.store(fileoutputstream, "Minecraft server properties");
         } catch (Exception exception) {
@@ -80,36 +106,36 @@
             this.savePropertiesFile();
         }
 
-        return this.properties.getProperty(s, s1);
+        return getOverride(s, this.properties.getProperty(s, s1)); // CraftBukkit
     }
 
     public int getInt(String s, int i) {
         try {
-            return Integer.parseInt(this.getString(s, "" + i));
+            return getOverride(s, Integer.parseInt(this.getString(s, "" + i))); // CraftBukkit
         } catch (Exception exception) {
             this.properties.setProperty(s, "" + i);
             this.savePropertiesFile();
-            return i;
+            return getOverride(s, i); // CraftBukkit
         }
     }
 
     public long getLong(String s, long i) {
         try {
-            return Long.parseLong(this.getString(s, "" + i));
+            return getOverride(s, Long.parseLong(this.getString(s, "" + i))); // CraftBukkit
         } catch (Exception exception) {
             this.properties.setProperty(s, "" + i);
             this.savePropertiesFile();
-            return i;
+            return getOverride(s, i); // CraftBukkit
         }
     }
 
     public boolean getBoolean(String s, boolean flag) {
         try {
-            return Boolean.parseBoolean(this.getString(s, "" + flag));
+            return getOverride(s, Boolean.parseBoolean(this.getString(s, "" + flag))); //CraftBukkit
         } catch (Exception exception) {
             this.properties.setProperty(s, "" + flag);
             this.savePropertiesFile();
-            return flag;
+            return getOverride(s, flag); // CraftBukkit
         }
     }