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// Copyright 2016 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.sandbox;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSet.Builder;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.ActionInput;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.Spawn;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.buildtool.BuildRequest;
import com.google.devtools.build.lib.exec.SpawnInputExpander;
import com.google.devtools.build.lib.rules.fileset.FilesetActionContext;
import com.google.devtools.build.lib.standalone.StandaloneSpawnStrategy;
import com.google.devtools.build.lib.util.Preconditions;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
/** Helper methods that are shared by the different sandboxing strategies in this package. */
public final class SandboxHelpers {
static void fallbackToNonSandboxedExecution(
Spawn spawn, ActionExecutionContext actionExecutionContext)
throws ExecException, InterruptedException {
StandaloneSpawnStrategy standaloneStrategy =
Preconditions.checkNotNull(
actionExecutionContext.getContext(StandaloneSpawnStrategy.class));
standaloneStrategy.exec(spawn, actionExecutionContext);
}
static void reportSubcommand(ActionExecutionContext actionExecutionContext, Spawn spawn) {
if (actionExecutionContext.reportsSubcommands()) {
actionExecutionContext.reportSubcommand(spawn);
}
}
/**
* Returns the inputs of a Spawn as a map of PathFragments relative to an execRoot to paths in the
* host filesystem where the input files can be found.
*/
public static Map<PathFragment, Path> getInputFiles(
SpawnInputExpander spawnInputExpander,
Path execRoot,
Spawn spawn,
ActionExecutionContext executionContext)
throws IOException {
Map<PathFragment, ActionInput> inputMap =
spawnInputExpander.getInputMapping(
spawn,
executionContext.getArtifactExpander(),
executionContext.getActionInputFileCache(),
executionContext.getContext(FilesetActionContext.class));
// SpawnInputExpander#getInputMapping uses ArtifactExpander#expandArtifacts to expand
// middlemen and tree artifacts, which expands empty tree artifacts to no entry. However,
// actions that accept TreeArtifacts as inputs generally expect that the empty directory is
// created. So we add those explicitly here.
// TODO(ulfjack): Move this code to SpawnInputExpander.
for (ActionInput input : spawn.getInputFiles()) {
if (input instanceof Artifact && ((Artifact) input).isTreeArtifact()) {
List<Artifact> containedArtifacts = new ArrayList<>();
executionContext.getArtifactExpander().expand((Artifact) input, containedArtifacts);
// Attempting to mount a non-empty directory results in ERR_DIRECTORY_NOT_EMPTY, so we
// only mount empty TreeArtifacts as directories.
if (containedArtifacts.isEmpty()) {
inputMap.put(input.getExecPath(), input);
}
}
}
Map<PathFragment, Path> inputFiles = new TreeMap<>();
for (Map.Entry<PathFragment, ActionInput> e : inputMap.entrySet()) {
Path inputPath =
e.getValue() == SpawnInputExpander.EMPTY_FILE
? null
: execRoot.getRelative(e.getValue().getExecPath());
inputFiles.put(e.getKey(), inputPath);
}
return inputFiles;
}
public static ImmutableSet<PathFragment> getOutputFiles(Spawn spawn) {
Builder<PathFragment> outputFiles = ImmutableSet.builder();
for (ActionInput output : spawn.getOutputFiles()) {
outputFiles.add(PathFragment.create(output.getExecPathString()));
}
return outputFiles.build();
}
static boolean shouldAllowNetwork(BuildRequest buildRequest, Spawn spawn) {
// Allow network access, when --java_debug is specified, otherwise we can't connect to the
// remote debug server of the test. This intentionally overrides the "block-network" execution
// tag.
if (buildRequest
.getOptions(BuildConfiguration.Options.class)
.testArguments
.contains("--wrapper_script_flag=--debug")) {
return true;
}
// If the Spawn requests to block network access, do so.
if (spawn.getExecutionInfo().containsKey("block-network")) {
return false;
}
// Network access is allowed by default.
return true;
}
}
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