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ExtraAction.java
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ExtraAction.java
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// Copyright 2014 The Bazel Authors. 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.analysis.extra;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Sets;
import com.google.devtools.build.lib.actions.AbstractAction;
import com.google.devtools.build.lib.actions.Action;
import com.google.devtools.build.lib.actions.ActionEnvironment;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.ActionExecutionException;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.CommandLine;
import com.google.devtools.build.lib.actions.CommandLineExpansionException;
import com.google.devtools.build.lib.actions.CommandLines;
import com.google.devtools.build.lib.actions.CommandLines.CommandLineLimits;
import com.google.devtools.build.lib.actions.CompositeRunfilesSupplier;
import com.google.devtools.build.lib.actions.EnvironmentalExecException;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.RunfilesSupplier;
import com.google.devtools.build.lib.actions.Spawn;
import com.google.devtools.build.lib.actions.SpawnResult;
import com.google.devtools.build.lib.analysis.actions.SpawnAction;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.server.FailureDetails.Execution.Code;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Action used by extra_action rules to create an action that shadows an existing action. Runs a
* command-line using {@link com.google.devtools.build.lib.actions.SpawnStrategy} for executions.
*/
public final class ExtraAction extends SpawnAction {
private final Action shadowedAction;
private final boolean createDummyOutput;
private final NestedSet<Artifact> extraActionInputs;
private boolean inputsDiscovered = false;
ExtraAction(
NestedSet<Artifact> extraActionInputs,
RunfilesSupplier runfilesSupplier,
Collection<Artifact.DerivedArtifact> outputs,
Action shadowedAction,
boolean createDummyOutput,
CommandLine argv,
ActionEnvironment env,
Map<String, String> executionInfo,
CharSequence progressMessage,
String mnemonic) {
super(
shadowedAction.getOwner(),
NestedSetBuilder.emptySet(Order.STABLE_ORDER),
createInputs(
shadowedAction.getInputs(),
NestedSetBuilder.emptySet(Order.STABLE_ORDER),
extraActionInputs),
outputs,
AbstractAction.DEFAULT_RESOURCE_SET,
CommandLines.of(argv),
CommandLineLimits.UNLIMITED,
env,
ImmutableMap.copyOf(executionInfo),
progressMessage,
CompositeRunfilesSupplier.of(shadowedAction.getRunfilesSupplier(), runfilesSupplier),
mnemonic,
null,
/*stripOutputPaths=*/ false);
this.shadowedAction = shadowedAction;
this.createDummyOutput = createDummyOutput;
this.extraActionInputs = extraActionInputs;
if (createDummyOutput) {
// Expecting just a single dummy file in the outputs.
Preconditions.checkArgument(outputs.size() == 1, outputs);
}
}
@Override
public boolean discoversInputs() {
return shadowedAction.discoversInputs();
}
@Override
protected boolean inputsDiscovered() {
return inputsDiscovered;
}
@Override
protected void setInputsDiscovered(boolean inputsDiscovered) {
this.inputsDiscovered = inputsDiscovered;
}
/**
* This method returns null when a required SkyValue is missing and a Skyframe restart is
* required.
*/
@Nullable
@Override
public NestedSet<Artifact> discoverInputs(ActionExecutionContext actionExecutionContext)
throws ActionExecutionException, InterruptedException {
Preconditions.checkState(discoversInputs(), this);
// We need to update our inputs to take account of any additional
// inputs the shadowed action may need to do its work.
NestedSet<Artifact> oldInputs = getInputs();
NestedSet<Artifact> inputFilesForExtraAction =
shadowedAction.getInputFilesForExtraAction(actionExecutionContext);
if (inputFilesForExtraAction == null) {
return null;
}
updateInputs(
createInputs(shadowedAction.getInputs(), inputFilesForExtraAction, extraActionInputs));
return NestedSetBuilder.wrap(
Order.STABLE_ORDER, Sets.difference(getInputs().toSet(), oldInputs.toSet()));
}
private static NestedSet<Artifact> createInputs(
NestedSet<Artifact> shadowedActionInputs,
NestedSet<Artifact> inputFilesForExtraAction,
NestedSet<Artifact> extraActionInputs) {
return new NestedSetBuilder<Artifact>(Order.STABLE_ORDER)
.addTransitive(shadowedActionInputs)
.addTransitive(inputFilesForExtraAction)
.addTransitive(extraActionInputs)
.build();
}
@Override
public NestedSet<Artifact> getAllowedDerivedInputs() {
return shadowedAction.getAllowedDerivedInputs();
}
@Override
public Spawn getSpawn(ActionExecutionContext actionExecutionContext)
throws CommandLineExpansionException, InterruptedException {
if (!createDummyOutput) {
return super.getSpawn(actionExecutionContext);
}
return getSpawn(
actionExecutionContext.getArtifactExpander(),
actionExecutionContext.getClientEnv(),
/*envResolved=*/ false,
actionExecutionContext.getTopLevelFilesets(),
/*reportOutputs=*/ false);
}
@Override
protected void afterExecute(
ActionExecutionContext actionExecutionContext, List<SpawnResult> spawnResults)
throws ExecException {
// PHASE 3: create dummy output.
// If the user didn't specify output, we need to create dummy output
// to make blaze schedule this action.
if (createDummyOutput) {
for (Artifact output : getOutputs()) {
try {
FileSystemUtils.touchFile(actionExecutionContext.getInputPath(output));
} catch (IOException e) {
throw new EnvironmentalExecException(e, Code.EXTRA_ACTION_OUTPUT_CREATION_FAILURE);
}
}
}
}
/** Returns the action this extra action is 'shadowing'. */
public Action getShadowedAction() {
return shadowedAction;
}
}