JENKINS-41805 Cleanup workspace suffixes (#4824)

core/src/main/java/hudson/FilePath.java

@@ -48,6 +48,7 @@ import hudson.remoting.RemoteOutputStream;
 import hudson.remoting.VirtualChannel;
 import hudson.remoting.Which;
 import hudson.security.AccessControlled;
+import hudson.slaves.WorkspaceList;
 import hudson.util.DaemonThreadFactory;
 import hudson.util.DirScanner;
 import hudson.util.ExceptionCatchingThreadFactory;
@@ -1257,6 +1258,44 @@ public final class FilePath implements SerializableOnlyOverRemoting {
             return mkdirs(f) || f.exists();
         }
     }
+    
+    /**
+     * Deletes all suffixes recursively.
+     * @throws IOException if it exists but could not be successfully deleted
+     * @since TODO
+     */
+    public void deleteSuffixesRecursive() throws IOException, InterruptedException {
+        act(new DeleteSuffixesRecursive());
+    }
+
+    /**
+     * Deletes all suffixed directories that are separated by {@link WorkspaceList#COMBINATOR}, including all its contents recursively.
+     */
+    private class DeleteSuffixesRecursive extends SecureFileCallable<Void> {
+        private static final long serialVersionUID = 1L;
+
+        @Override
+        public Void invoke(File f, VirtualChannel channel) throws IOException {
+            for (File file : listParentFiles(f)) {
+                if (file.getName().startsWith(f.getName() + WorkspaceList.COMBINATOR)) {
+                    Util.deleteRecursive(file.toPath(), path -> deleting(path.toFile()));
+                }
+            }
+            
+            return null;
+        }
+    }
+
+    private static File[] listParentFiles(File f) {
+        File parentFile = f.getParentFile();
+        if (parentFile != null) {
+            File[] files = parentFile.listFiles();
+            if (files != null) {
+                return files;
+            }
+        }
+        return new File[0];
+    }
 
     /**
      * Deletes this directory, including all its contents recursively.