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// Copyright 2015 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.ImmutableList;
import com.google.devtools.build.lib.actions.ActionContext;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.ResourceManager;
import com.google.devtools.build.lib.actions.Spawn;
import com.google.devtools.build.lib.actions.SpawnResult;
import com.google.devtools.build.lib.actions.Spawns;
import com.google.devtools.build.lib.exec.ActionContextProvider;
import com.google.devtools.build.lib.exec.SpawnRunner;
import com.google.devtools.build.lib.exec.apple.XCodeLocalEnvProvider;
import com.google.devtools.build.lib.exec.local.LocalEnvProvider;
import com.google.devtools.build.lib.exec.local.LocalExecutionOptions;
import com.google.devtools.build.lib.exec.local.LocalSpawnRunner;
import com.google.devtools.build.lib.exec.local.PosixLocalEnvProvider;
import com.google.devtools.build.lib.runtime.CommandEnvironment;
import com.google.devtools.build.lib.util.OS;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.common.options.OptionsProvider;
import java.io.IOException;
import java.time.Duration;
import java.util.Optional;
/**
* Provides the sandboxed spawn strategy.
*/
final class SandboxActionContextProvider extends ActionContextProvider {
private final ImmutableList<ActionContext> contexts;
private SandboxActionContextProvider(ImmutableList<ActionContext> contexts) {
this.contexts = contexts;
}
public static SandboxActionContextProvider create(CommandEnvironment cmdEnv, Path sandboxBase)
throws IOException {
ImmutableList.Builder<ActionContext> contexts = ImmutableList.builder();
OptionsProvider options = cmdEnv.getOptions();
int timeoutKillDelaySeconds =
options.getOptions(LocalExecutionOptions.class).localSigkillGraceSeconds;
Optional<Duration> timeoutKillDelay = Optional.empty();
if (timeoutKillDelaySeconds >= 0) {
timeoutKillDelay = Optional.of(Duration.ofSeconds(timeoutKillDelaySeconds));
}
String productName = cmdEnv.getRuntime().getProductName();
// This works on most platforms, but isn't the best choice, so we put it first and let later
// platform-specific sandboxing strategies become the default.
if (ProcessWrapperSandboxedSpawnRunner.isSupported(cmdEnv)) {
SpawnRunner spawnRunner =
withFallback(
cmdEnv,
new ProcessWrapperSandboxedSpawnRunner(
cmdEnv, sandboxBase, productName, timeoutKillDelay));
contexts.add(new ProcessWrapperSandboxedStrategy(cmdEnv.getExecRoot(), spawnRunner));
}
// This is the preferred sandboxing strategy on Linux.
if (LinuxSandboxedSpawnRunner.isSupported(cmdEnv)) {
SpawnRunner spawnRunner =
withFallback(
cmdEnv,
LinuxSandboxedStrategy.create(cmdEnv, sandboxBase, productName, timeoutKillDelay));
contexts.add(new LinuxSandboxedStrategy(cmdEnv.getExecRoot(), spawnRunner));
}
// This is the preferred sandboxing strategy on macOS.
if (DarwinSandboxedSpawnRunner.isSupported(cmdEnv)) {
SpawnRunner spawnRunner =
withFallback(
cmdEnv,
new DarwinSandboxedSpawnRunner(cmdEnv, sandboxBase, productName, timeoutKillDelay));
contexts.add(new DarwinSandboxedStrategy(cmdEnv.getExecRoot(), spawnRunner));
}
return new SandboxActionContextProvider(contexts.build());
}
private static SpawnRunner withFallback(CommandEnvironment env, SpawnRunner sandboxSpawnRunner) {
return new SandboxFallbackSpawnRunner(sandboxSpawnRunner, createFallbackRunner(env));
}
private static SpawnRunner createFallbackRunner(CommandEnvironment env) {
LocalExecutionOptions localExecutionOptions =
env.getOptions().getOptions(LocalExecutionOptions.class);
LocalEnvProvider localEnvProvider =
OS.getCurrent() == OS.DARWIN ? new XCodeLocalEnvProvider() : PosixLocalEnvProvider.INSTANCE;
return
new LocalSpawnRunner(
env.getExecRoot(),
localExecutionOptions,
ResourceManager.instance(),
env.getRuntime().getProductName(),
localEnvProvider);
}
@Override
public Iterable<? extends ActionContext> getActionContexts() {
return contexts;
}
private static final class SandboxFallbackSpawnRunner implements SpawnRunner {
private final SpawnRunner sandboxSpawnRunner;
private final SpawnRunner fallbackSpawnRunner;
SandboxFallbackSpawnRunner(SpawnRunner sandboxSpawnRunner, SpawnRunner fallbackSpawnRunner) {
this.sandboxSpawnRunner = sandboxSpawnRunner;
this.fallbackSpawnRunner = fallbackSpawnRunner;
}
@Override
public SpawnResult exec(Spawn spawn, SpawnExecutionPolicy policy)
throws InterruptedException, IOException, ExecException {
if (!Spawns.mayBeSandboxed(spawn)) {
return fallbackSpawnRunner.exec(spawn, policy);
} else {
return sandboxSpawnRunner.exec(spawn, policy);
}
}
}
}
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