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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.sandbox;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.ExecutionStrategy;
import com.google.devtools.build.lib.actions.Executor;
import com.google.devtools.build.lib.actions.Spawn;
import com.google.devtools.build.lib.actions.SpawnActionContext;
import com.google.devtools.build.lib.actions.Spawns;
import com.google.devtools.build.lib.actions.UserExecException;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.buildtool.BuildRequest;
import com.google.devtools.build.lib.runtime.CommandEnvironment;
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.Set;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.atomic.AtomicInteger;
/** Strategy that uses sandboxing to execute a process. */
@ExecutionStrategy(
name = {"sandboxed"},
contextType = SpawnActionContext.class
)
public class LinuxSandboxedStrategy extends SandboxStrategy {
private static Boolean sandboxingSupported = null;
public static boolean isSupported(CommandEnvironment env) {
if (sandboxingSupported == null) {
sandboxingSupported =
ProcessWrapperRunner.isSupported(env) || LinuxSandboxRunner.isSupported(env);
}
return sandboxingSupported.booleanValue();
}
private final BuildRequest buildRequest;
private final SandboxOptions sandboxOptions;
private final BlazeDirectories blazeDirs;
private final Path execRoot;
private final ExecutorService backgroundWorkers;
private final boolean verboseFailures;
private final String productName;
private final boolean fullySupported;
private final UUID uuid = UUID.randomUUID();
private final AtomicInteger execCounter = new AtomicInteger();
LinuxSandboxedStrategy(
BuildRequest buildRequest,
BlazeDirectories blazeDirs,
ExecutorService backgroundWorkers,
boolean verboseFailures,
String productName,
boolean fullySupported) {
super(blazeDirs, verboseFailures, buildRequest.getOptions(SandboxOptions.class));
this.buildRequest = buildRequest;
this.sandboxOptions = buildRequest.getOptions(SandboxOptions.class);
this.blazeDirs = blazeDirs;
this.execRoot = blazeDirs.getExecRoot();
this.backgroundWorkers = Preconditions.checkNotNull(backgroundWorkers);
this.verboseFailures = verboseFailures;
this.productName = productName;
this.fullySupported = fullySupported;
}
/**
* Executes the given {@code spawn}.
*/
@Override
public void exec(Spawn spawn, ActionExecutionContext actionExecutionContext)
throws ExecException {
Executor executor = actionExecutionContext.getExecutor();
// Certain actions can't run remotely or in a sandbox - pass them on to the standalone strategy.
if (!spawn.isRemotable() || spawn.hasNoSandbox()) {
SandboxHelpers.fallbackToNonSandboxedExecution(spawn, actionExecutionContext, executor);
return;
}
SandboxHelpers.reportSubcommand(executor, spawn);
SandboxHelpers.postActionStatusMessage(executor, spawn);
// Each invocation of "exec" gets its own sandbox.
Path sandboxPath = SandboxHelpers.getSandboxRoot(blazeDirs, productName, uuid, execCounter);
Path sandboxExecRoot = sandboxPath.getRelative("execroot").getRelative(execRoot.getBaseName());
Path sandboxTempDir = sandboxPath.getRelative("tmp");
Set<Path> writableDirs = getWritableDirs(sandboxExecRoot, spawn.getEnvironment());
try {
// Build the execRoot for the sandbox.
SymlinkedExecRoot symlinkedExecRoot = new SymlinkedExecRoot(sandboxExecRoot);
ImmutableSet<PathFragment> outputs = SandboxHelpers.getOutputFiles(spawn);
symlinkedExecRoot.createFileSystem(
getMounts(spawn, actionExecutionContext), outputs, writableDirs);
sandboxTempDir.createDirectory();
final SandboxRunner runner;
if (fullySupported) {
runner =
new LinuxSandboxRunner(
execRoot,
sandboxPath,
sandboxExecRoot,
sandboxTempDir,
getWritableDirs(sandboxExecRoot, spawn.getEnvironment()),
getInaccessiblePaths(),
getBindMounts(blazeDirs),
verboseFailures,
sandboxOptions.sandboxDebug);
} else {
runner = new ProcessWrapperRunner(execRoot, sandboxPath, sandboxExecRoot, verboseFailures);
}
try {
runner.run(
spawn.getArguments(),
spawn.getEnvironment(),
actionExecutionContext.getFileOutErr(),
Spawns.getTimeoutSeconds(spawn),
SandboxHelpers.shouldAllowNetwork(buildRequest, spawn));
} finally {
symlinkedExecRoot.copyOutputs(execRoot, outputs);
if (!sandboxOptions.sandboxDebug) {
SandboxHelpers.lazyCleanup(backgroundWorkers, runner);
}
}
} catch (IOException e) {
throw new UserExecException("I/O error during sandboxed execution", e);
}
}
private ImmutableSet<Path> getBindMounts(BlazeDirectories blazeDirs) {
Path tmpPath = blazeDirs.getFileSystem().getPath("/tmp");
ImmutableSet.Builder<Path> bindMounts = ImmutableSet.builder();
if (blazeDirs.getWorkspace().startsWith(tmpPath)) {
bindMounts.add(blazeDirs.getWorkspace());
}
if (blazeDirs.getOutputBase().startsWith(tmpPath)) {
bindMounts.add(blazeDirs.getOutputBase());
}
return bindMounts.build();
}
}
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