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// Copyright 2017 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.ActionStatusMessage;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.ExecutionStrategy;
import com.google.devtools.build.lib.actions.Spawn;
import com.google.devtools.build.lib.actions.SpawnActionContext;
import com.google.devtools.build.lib.buildtool.BuildRequest;
import com.google.devtools.build.lib.exec.SpawnInputExpander;
import com.google.devtools.build.lib.exec.apple.XCodeLocalEnvProvider;
import com.google.devtools.build.lib.exec.local.LocalEnvProvider;
import com.google.devtools.build.lib.runtime.CommandEnvironment;
import com.google.devtools.build.lib.util.OS;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;
/** Strategy that uses sandboxing to execute a process. */
@ExecutionStrategy(
name = {"sandboxed", "processwrapper-sandbox"},
contextType = SpawnActionContext.class
)
public class ProcessWrapperSandboxedStrategy extends SandboxStrategy {
public static boolean isSupported(CommandEnvironment cmdEnv) {
return ProcessWrapperRunner.isSupported(cmdEnv);
}
private final SandboxOptions sandboxOptions;
private final Path execRoot;
private final boolean verboseFailures;
private final String productName;
private final SpawnInputExpander spawnInputExpander;
private final LocalEnvProvider localEnvProvider;
ProcessWrapperSandboxedStrategy(
CommandEnvironment cmdEnv,
BuildRequest buildRequest,
Path sandboxBase,
boolean verboseFailures,
String productName) {
super(
cmdEnv,
buildRequest,
sandboxBase,
verboseFailures,
buildRequest.getOptions(SandboxOptions.class));
this.sandboxOptions = buildRequest.getOptions(SandboxOptions.class);
this.execRoot = cmdEnv.getExecRoot();
this.verboseFailures = verboseFailures;
this.productName = productName;
this.spawnInputExpander = new SpawnInputExpander(false);
this.localEnvProvider = OS.getCurrent() == OS.DARWIN
? new XCodeLocalEnvProvider()
: LocalEnvProvider.UNMODIFIED;
}
@Override
protected void actuallyExec(
Spawn spawn,
ActionExecutionContext actionExecutionContext,
AtomicReference<Class<? extends SpawnActionContext>> writeOutputFiles)
throws ExecException, InterruptedException, IOException {
actionExecutionContext
.getEventBus()
.post(
ActionStatusMessage.runningStrategy(
spawn.getResourceOwner(), "processwrapper-sandbox"));
SandboxHelpers.reportSubcommand(actionExecutionContext, spawn);
// Each invocation of "exec" gets its own sandbox.
Path sandboxPath = getSandboxRoot();
Path sandboxExecRoot = sandboxPath.getRelative("execroot").getRelative(execRoot.getBaseName());
Map<String, String> spawnEnvironment =
localEnvProvider.rewriteLocalEnv(spawn.getEnvironment(), execRoot, productName);
Set<Path> writableDirs = getWritableDirs(sandboxExecRoot, spawn.getEnvironment());
SymlinkedExecRoot symlinkedExecRoot = new SymlinkedExecRoot(sandboxExecRoot);
ImmutableSet<PathFragment> outputs = SandboxHelpers.getOutputFiles(spawn);
symlinkedExecRoot.createFileSystem(
SandboxHelpers.getInputFiles(
spawnInputExpander, this.execRoot, spawn, actionExecutionContext),
outputs,
writableDirs);
SandboxRunner runner = new ProcessWrapperRunner(sandboxExecRoot, verboseFailures);
try {
runSpawn(
spawn,
actionExecutionContext,
spawnEnvironment,
symlinkedExecRoot,
outputs,
runner,
writeOutputFiles);
} finally {
if (!sandboxOptions.sandboxDebug) {
try {
FileSystemUtils.deleteTree(sandboxPath);
} catch (IOException e) {
// This usually means that the Spawn itself exited, but still has children running that
// we couldn't wait for, which now block deletion of the sandbox directory. On Linux this
// should never happen, as we use PID namespaces and where they are not available the
// subreaper feature to make sure all children have been reliably killed before returning,
// but on other OS this might not always work. The SandboxModule will try to delete them
// again when the build is all done, at which point it hopefully works, so let's just go
// on here.
}
}
}
}
}
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