Merge pull request #2012 from stephenc/jenkins-32765

[FIXED JENKINS-32765] Allow the directory that plugins are exploded into to be changed

core/src/main/java/hudson/ClassicPluginStrategy.java

@@ -162,7 +162,8 @@ public class ClassicPluginStrategy implements PluginStrategy {
             if (archive.isDirectory()) {// already expanded
                 expandDir = archive;
             } else {
-                expandDir = new File(archive.getParentFile(), getBaseName(archive.getName()));
+                File f = pluginManager.getWorkDir();
+                expandDir =  new File(f == null ? archive.getParentFile() : f, getBaseName(archive.getName()));
                 explode(archive, expandDir);
             }
 

core/src/main/java/hudson/PluginManager.java

@@ -149,6 +149,13 @@ public abstract class PluginManager extends AbstractModelObject implements OnMas
      */
     public final File rootDir;
 
+    /**
+     * If non-null, the base directory for all exploded .hpi/.jpi plugins. Controlled by the system property / servlet
+     * context parameter {@literal hudson.PluginManager.workDir}.
+     */
+    @CheckForNull
+    private final File workDir;
+
     /**
      * @deprecated as of 1.355
      *      {@link PluginManager} can now live longer than {@link jenkins.model.Jenkins} instance, so
@@ -199,6 +206,11 @@ public abstract class PluginManager extends AbstractModelObject implements OnMas
         this.rootDir = rootDir;
         if(!rootDir.exists())
             rootDir.mkdirs();
+        String workDir = System.getProperty(PluginManager.class.getName()+".workDir");
+        if (workDir == null && context != null) {
+            workDir = context.getInitParameter(PluginManager.class.getName() + ".workDir");
+        }
+        this.workDir = workDir == null ? null : new File(workDir);
 
         strategy = createPluginStrategy();
 
@@ -218,6 +230,15 @@ public abstract class PluginManager extends AbstractModelObject implements OnMas
         return new Api(this);
     }
 
+    /**
+     * If non-null, the base directory for all exploded .hpi/.jpi plugins.
+     * @return the base directory for all exploded .hpi/.jpi plugins or {@code null} to leave this up to the strategy.
+     */
+    @CheckForNull
+    public File getWorkDir() {
+        return workDir;
+    }
+
     /**
      * Find all registered overrides (intended to allow overriding/adding views)
      * @return List of extensions