1 files changed, 49 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/FileSymlinkCycleException.java b/src/main/java/com/google/devtools/build/lib/skyframe/FileSymlinkCycleException.java
new file mode 100644
index 0000000000..d57fc42cfc
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/FileSymlinkCycleException.java
@@ -0,0 +1,49 @@
+// 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;
+
+import com.google.common.collect.ImmutableList;
+import com.google.devtools.build.lib.vfs.RootedPath;
+
+/** Exception indicating that a cycle was found in the filesystem. */
+public class FileSymlinkCycleException extends Exception {
+
+  private final ImmutableList<RootedPath> pathToCycle;
+  private final ImmutableList<RootedPath> cycle;
+
+  FileSymlinkCycleException(ImmutableList<RootedPath> pathToCycle,
+      ImmutableList<RootedPath> cycle) {
+    // The cycle itself has already been reported by FileSymlinkCycleUniquenessValue, but we still
+    // want to have a readable #getMessage.
+    super("Symlink cycle");
+    this.pathToCycle = pathToCycle;
+    this.cycle = cycle;
+  }
+
+  /**
+   * The symlink path to the symlink cycle. For example, suppose 'a' -> 'b' -> 'c' -> 'd' -> 'c'.
+   * The path to the cycle is 'a', 'b'.
+   */
+  ImmutableList<RootedPath> getPathToCycle() {
+    return pathToCycle;
+  }
+
+  /**
+   * The symlink cycle. For example, suppose 'a' -> 'b' -> 'c' -> 'd' -> 'c'.
+   * The cycle is 'c', 'd'.
+   */
+  ImmutableList<RootedPath> getCycle() {
+    return cycle;
+  }
+}