Handle exceptions encountered resolving packages during the execution phase

Currently we may do lookups of not-already-cached packages during the
execution phase for actions that discover inputs. Exceptions encountered
during this would go unhandled and result in a crash. Here we introduce
PackageRootResolutionException which wraps these exceptions and triggers
an ActionExecutionException which is cleanly handled in the exec phase.

As part of this change SkyframeActionExecutor#getArtifactRoots(...) will
fail properly on errors getting package roots.

--
MOS_MIGRATED_REVID=95578891

1 files changed, 26 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/actions/PackageRootResolutionException.java b/src/main/java/com/google/devtools/build/lib/actions/PackageRootResolutionException.java
new file mode 100644
index 0000000000..ff16aaa789
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/actions/PackageRootResolutionException.java
@@ -0,0 +1,26 @@
+// Copyright 2015 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.actions;
+
+/**
+ * Exception signaling an error occurred determining package roots. See
+ * {@link PackageRootResolver#findPackageRoots(Iterable)} for further details.
+ */
+public class PackageRootResolutionException extends Exception {
+
+  public PackageRootResolutionException(String msg, Throwable cause) {
+    super(msg, cause);
+  }
+}