1 files changed, 27 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/InconsistentFilesystemException.java b/src/main/java/com/google/devtools/build/lib/skyframe/InconsistentFilesystemException.java
new file mode 100644
index 0000000000..26cb02f017
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/InconsistentFilesystemException.java
@@ -0,0 +1,27 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.build.lib.skyframe;
+
+/**
+ * Used to indicate a filesystem inconsistency, e.g. file 'a/b' exists but directory 'a' doesn't
+ * exist. This generally means the result of the build is undefined but we shouldn't crash hard.
+ */
+public class InconsistentFilesystemException extends Exception {
+  public InconsistentFilesystemException(String inconsistencyMessage) {
+    super("Inconsistent filesystem operations. " + inconsistencyMessage + " The results of the "
+        + "build are not guaranteed to be correct. You should probably run 'blaze clean' and "
+        + "investigate the filesystem inconsistency (likely due to filesytem updates concurrent "
+        + "with the build)");
+  }
+}