1 files changed, 91 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/rules/extra/ExtraActionFactory.java b/src/main/java/com/google/devtools/build/lib/rules/extra/ExtraActionFactory.java
new file mode 100644
index 0000000000..8040ee0c03
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/rules/extra/ExtraActionFactory.java
@@ -0,0 +1,91 @@
+// 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.rules.extra;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Lists;
+import com.google.devtools.build.lib.actions.Artifact;
+import com.google.devtools.build.lib.analysis.CommandHelper;
+import com.google.devtools.build.lib.analysis.ConfigurationMakeVariableContext;
+import com.google.devtools.build.lib.analysis.ConfiguredTarget;
+import com.google.devtools.build.lib.analysis.FilesToRunProvider;
+import com.google.devtools.build.lib.analysis.MakeVariableExpander;
+import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
+import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
+import com.google.devtools.build.lib.analysis.RuleContext;
+import com.google.devtools.build.lib.analysis.Runfiles;
+import com.google.devtools.build.lib.analysis.RunfilesProvider;
+import com.google.devtools.build.lib.packages.Type;
+import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
+import com.google.devtools.build.lib.syntax.Label;
+
+import java.util.List;
+
+/**
+ * Factory for 'extra_action'.
+ */
+public final class ExtraActionFactory implements RuleConfiguredTargetFactory {
+  @Override
+  public ConfiguredTarget create(RuleContext context) {
+    // This rule doesn't produce any output when listed as a build target.
+    // Only when used via the --experimental_action_listener flag,
+    // this rule instructs the build system to add additional outputs.
+    List<Artifact> resolvedData = Lists.newArrayList();
+
+    Iterable<FilesToRunProvider> tools =
+        context.getPrerequisites("tools", Mode.HOST, FilesToRunProvider.class);
+    CommandHelper commandHelper = new CommandHelper(
+        context, tools, ImmutableMap.<Label, Iterable<Artifact>>of());
+
+    resolvedData.addAll(context.getPrerequisiteArtifacts("data", Mode.DATA).list());
+    List<String>outputTemplates =
+        context.attributes().get("out_templates", Type.STRING_LIST);
+
+    String command = commandHelper.resolveCommandAndExpandLabels(false, true);
+    // This is a bit of a hack. We want to run the MakeVariableExpander first, so we expand $ on
+    // variables that are expanded below with $$, which gets reverted to $ by the
+    // MakeVariableExpander. This allows us to expand package-specific make variables in the
+    // package where the extra action is defined, and then later replace the owner-specific make
+    // variables when the extra action is instantiated.
+    command = command.replace("$(EXTRA_ACTION_FILE)", "$$(EXTRA_ACTION_FILE)");
+    command = command.replace("$(ACTION_ID)", "$$(ACTION_ID)");
+    command = command.replace("$(OWNER_LABEL_DIGEST)", "$$(OWNER_LABEL_DIGEST)");
+    command = command.replace("$(output ", "$$(output ");
+    try {
+      command = MakeVariableExpander.expand(
+          command, new ConfigurationMakeVariableContext(
+              context.getTarget().getPackage(), context.getConfiguration()));
+    } catch (MakeVariableExpander.ExpansionException e) {
+      context.ruleError(String.format("Unable to expand make variables: %s",
+          e.getMessage()));
+    }
+
+    boolean requiresActionOutput =
+        context.attributes().get("requires_action_output", Type.BOOLEAN);
+
+    ExtraActionSpec spec = new ExtraActionSpec(
+        commandHelper.getResolvedTools(),
+        commandHelper.getRemoteRunfileManifestMap(),
+        resolvedData,
+        outputTemplates,
+        command,
+        context.getLabel(),
+        requiresActionOutput);
+
+    return new RuleConfiguredTargetBuilder(context)
+        .addProvider(ExtraActionSpec.class, spec)
+        .add(RunfilesProvider.class, RunfilesProvider.simple(Runfiles.EMPTY))
+        .build();
+  }
+}