| // 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 static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.ImmutableSet; |
| import com.google.devtools.build.lib.actions.ActionExecutionMetadata; |
| import com.google.devtools.build.lib.actions.ExecException; |
| import com.google.devtools.build.lib.actions.ResourceManager; |
| import com.google.devtools.build.lib.actions.ResourceManager.ResourceHandle; |
| import com.google.devtools.build.lib.actions.Spawn; |
| import com.google.devtools.build.lib.actions.SpawnResult; |
| import com.google.devtools.build.lib.actions.SpawnResult.Status; |
| import com.google.devtools.build.lib.actions.Spawns; |
| import com.google.devtools.build.lib.actions.UserExecException; |
| import com.google.devtools.build.lib.exec.BinTools; |
| import com.google.devtools.build.lib.exec.ExecutionOptions; |
| import com.google.devtools.build.lib.exec.SpawnRunner; |
| import com.google.devtools.build.lib.exec.TreeDeleter; |
| import com.google.devtools.build.lib.profiler.Profiler; |
| import com.google.devtools.build.lib.profiler.SilentCloseable; |
| import com.google.devtools.build.lib.runtime.CommandEnvironment; |
| import com.google.devtools.build.lib.shell.ExecutionStatistics; |
| import com.google.devtools.build.lib.shell.Subprocess; |
| import com.google.devtools.build.lib.shell.SubprocessBuilder; |
| import com.google.devtools.build.lib.shell.TerminationStatus; |
| import com.google.devtools.build.lib.util.CommandFailureUtils; |
| import com.google.devtools.build.lib.util.OS; |
| import com.google.devtools.build.lib.util.io.FileOutErr; |
| import com.google.devtools.build.lib.vfs.FileSystem; |
| import com.google.devtools.build.lib.vfs.Path; |
| import java.io.IOException; |
| import java.time.Duration; |
| import java.util.Map; |
| |
| /** Abstract common ancestor for sandbox spawn runners implementing the common parts. */ |
| abstract class AbstractSandboxSpawnRunner implements SpawnRunner { |
| private static final int LOCAL_EXEC_ERROR = -1; |
| private static final int POSIX_TIMEOUT_EXIT_CODE = /*SIGNAL_BASE=*/128 + /*SIGALRM=*/14; |
| |
| private static final String SANDBOX_DEBUG_SUGGESTION = |
| "\n\nUse --sandbox_debug to see verbose messages from the sandbox"; |
| |
| private final SandboxOptions sandboxOptions; |
| private final boolean verboseFailures; |
| private final ImmutableSet<Path> inaccessiblePaths; |
| protected final BinTools binTools; |
| private final Path execRoot; |
| private final ResourceManager resourceManager; |
| |
| public AbstractSandboxSpawnRunner(CommandEnvironment cmdEnv) { |
| this.sandboxOptions = cmdEnv.getOptions().getOptions(SandboxOptions.class); |
| this.verboseFailures = cmdEnv.getOptions().getOptions(ExecutionOptions.class).verboseFailures; |
| this.inaccessiblePaths = |
| sandboxOptions.getInaccessiblePaths(cmdEnv.getRuntime().getFileSystem()); |
| this.binTools = cmdEnv.getBlazeWorkspace().getBinTools(); |
| this.execRoot = cmdEnv.getExecRoot(); |
| this.resourceManager = cmdEnv.getLocalResourceManager(); |
| } |
| |
| @Override |
| public final SpawnResult exec(Spawn spawn, SpawnExecutionContext context) |
| throws ExecException, IOException, InterruptedException { |
| ActionExecutionMetadata owner = spawn.getResourceOwner(); |
| context.report(ProgressStatus.SCHEDULING, getName()); |
| try (ResourceHandle ignored = |
| resourceManager.acquireResources(owner, spawn.getLocalResources())) { |
| context.report(ProgressStatus.EXECUTING, getName()); |
| SandboxedSpawn sandbox = prepareSpawn(spawn, context); |
| return runSpawn(spawn, sandbox, context); |
| } catch (IOException e) { |
| throw new UserExecException("I/O exception during sandboxed execution", e); |
| } |
| } |
| |
| @Override |
| public boolean canExec(Spawn spawn) { |
| return Spawns.mayBeSandboxed(spawn); |
| } |
| |
| protected abstract SandboxedSpawn prepareSpawn(Spawn spawn, SpawnExecutionContext context) |
| throws IOException, ExecException; |
| |
| private SpawnResult runSpawn( |
| Spawn originalSpawn, SandboxedSpawn sandbox, SpawnExecutionContext context) |
| throws IOException, InterruptedException { |
| try { |
| try (SilentCloseable c = Profiler.instance().profile("sandbox.createFileSystem")) { |
| sandbox.createFileSystem(); |
| } |
| FileOutErr outErr = context.getFileOutErr(); |
| try (SilentCloseable c = Profiler.instance().profile("context.prefetchInputs")) { |
| context.prefetchInputs(); |
| } |
| |
| SpawnResult result; |
| try (SilentCloseable c = Profiler.instance().profile("subprocess.run")) { |
| result = run(originalSpawn, sandbox, context.getTimeout(), outErr); |
| } |
| |
| context.lockOutputFiles(); |
| try (SilentCloseable c = Profiler.instance().profile("sandbox.copyOutputs")) { |
| // We copy the outputs even when the command failed. |
| sandbox.copyOutputs(execRoot); |
| } catch (IOException e) { |
| throw new IOException("Could not move output artifacts from sandboxed execution", e); |
| } |
| return result; |
| } finally { |
| if (!sandboxOptions.sandboxDebug) { |
| try (SilentCloseable c = Profiler.instance().profile("sandbox.delete")) { |
| sandbox.delete(); |
| } |
| } |
| } |
| } |
| |
| private String makeFailureMessage(Spawn originalSpawn, SandboxedSpawn sandbox) { |
| if (sandboxOptions.sandboxDebug) { |
| return CommandFailureUtils.describeCommandFailure( |
| true, |
| sandbox.getArguments(), |
| sandbox.getEnvironment(), |
| sandbox.getSandboxExecRoot().getPathString(), |
| null); |
| } else { |
| return CommandFailureUtils.describeCommandFailure( |
| verboseFailures, |
| originalSpawn.getArguments(), |
| originalSpawn.getEnvironment(), |
| sandbox.getSandboxExecRoot().getPathString(), |
| originalSpawn.getExecutionPlatform()) |
| + SANDBOX_DEBUG_SUGGESTION; |
| } |
| } |
| |
| private final SpawnResult run( |
| Spawn originalSpawn, SandboxedSpawn sandbox, Duration timeout, FileOutErr outErr) |
| throws IOException, InterruptedException { |
| SubprocessBuilder subprocessBuilder = new SubprocessBuilder(); |
| subprocessBuilder.setWorkingDirectory(sandbox.getSandboxExecRoot().getPathFile()); |
| subprocessBuilder.setStdout(outErr.getOutputPath().getPathFile()); |
| subprocessBuilder.setStderr(outErr.getErrorPath().getPathFile()); |
| subprocessBuilder.setEnv(sandbox.getEnvironment()); |
| subprocessBuilder.setArgv(ImmutableList.copyOf(sandbox.getArguments())); |
| boolean useSubprocessTimeout = sandbox.useSubprocessTimeout(); |
| if (useSubprocessTimeout) { |
| subprocessBuilder.setTimeoutMillis(timeout.toMillis()); |
| } |
| long startTime = System.currentTimeMillis(); |
| TerminationStatus terminationStatus; |
| try { |
| Subprocess subprocess = subprocessBuilder.start(); |
| subprocess.getOutputStream().close(); |
| try { |
| subprocess.waitFor(); |
| terminationStatus = new TerminationStatus(subprocess.exitValue(), subprocess.timedout()); |
| } catch (InterruptedException e) { |
| subprocess.destroy(); |
| throw e; |
| } |
| } catch (IOException e) { |
| String msg = e.getMessage() == null ? e.getClass().getName() : e.getMessage(); |
| outErr |
| .getErrorStream() |
| .write(("Action failed to execute: java.io.IOException: " + msg + "\n").getBytes(UTF_8)); |
| outErr.getErrorStream().flush(); |
| return new SpawnResult.Builder() |
| .setRunnerName(getName()) |
| .setStatus(Status.EXECUTION_FAILED) |
| .setExitCode(LOCAL_EXEC_ERROR) |
| .setFailureMessage(makeFailureMessage(originalSpawn, sandbox)) |
| .build(); |
| } |
| |
| // TODO(b/62588075): Calculate wall time inside Subprocess instead? |
| Duration wallTime = Duration.ofMillis(System.currentTimeMillis() - startTime); |
| boolean wasTimeout = |
| (useSubprocessTimeout && terminationStatus.timedOut()) |
| || (!useSubprocessTimeout && wasTimeout(timeout, wallTime)); |
| int exitCode = wasTimeout ? POSIX_TIMEOUT_EXIT_CODE : terminationStatus.getRawExitCode(); |
| Status status = |
| wasTimeout |
| ? Status.TIMEOUT |
| : (exitCode == 0) ? Status.SUCCESS : Status.NON_ZERO_EXIT; |
| |
| SpawnResult.Builder spawnResultBuilder = |
| new SpawnResult.Builder() |
| .setRunnerName(getName()) |
| .setStatus(status) |
| .setExitCode(exitCode) |
| .setWallTime(wallTime) |
| .setFailureMessage( |
| status != Status.SUCCESS || exitCode != 0 |
| ? makeFailureMessage(originalSpawn, sandbox) |
| : ""); |
| |
| Path statisticsPath = sandbox.getStatisticsPath(); |
| if (statisticsPath != null) { |
| ExecutionStatistics.getResourceUsage(statisticsPath) |
| .ifPresent( |
| resourceUsage -> { |
| spawnResultBuilder.setUserTime(resourceUsage.getUserExecutionTime()); |
| spawnResultBuilder.setSystemTime(resourceUsage.getSystemExecutionTime()); |
| spawnResultBuilder.setNumBlockOutputOperations( |
| resourceUsage.getBlockOutputOperations()); |
| spawnResultBuilder.setNumBlockInputOperations( |
| resourceUsage.getBlockInputOperations()); |
| spawnResultBuilder.setNumInvoluntaryContextSwitches( |
| resourceUsage.getInvoluntaryContextSwitches()); |
| }); |
| } |
| |
| return spawnResultBuilder.build(); |
| } |
| |
| private boolean wasTimeout(Duration timeout, Duration wallTime) { |
| return !timeout.isZero() && wallTime.compareTo(timeout) > 0; |
| } |
| |
| /** |
| * Gets the list of directories that the spawn will assume to be writable. |
| * |
| * @throws IOException because we might resolve symlinks, which throws {@link IOException}. |
| */ |
| protected ImmutableSet<Path> getWritableDirs(Path sandboxExecRoot, Map<String, String> env) |
| throws IOException { |
| // We have to make the TEST_TMPDIR directory writable if it is specified. |
| ImmutableSet.Builder<Path> writablePaths = ImmutableSet.builder(); |
| |
| // On Windows, sandboxExecRoot is actually the main execroot. We will specify |
| // exactly which output path is writable. |
| if (OS.getCurrent() != OS.WINDOWS) { |
| writablePaths.add(sandboxExecRoot); |
| } |
| |
| String testTmpdir = env.get("TEST_TMPDIR"); |
| if (testTmpdir != null) { |
| addWritablePath( |
| sandboxExecRoot, |
| writablePaths, |
| testTmpdir, |
| "Cannot resolve symlinks in TEST_TMPDIR because it doesn't exist: \"%s\""); |
| } |
| // As of 2019-07-08: |
| // - every caller of `getWritableDirs` passes a LocalEnvProvider-processed environment as |
| // `env`, therefore `env` surely has an entry for TMPDIR on Unix and TEMP/TMP on Windows. |
| if (OS.getCurrent() == OS.WINDOWS) { |
| addWritablePath( |
| sandboxExecRoot, |
| writablePaths, |
| Preconditions.checkNotNull(env.get("TEMP")), |
| "Cannot resolve symlinks in TEMP because it doesn't exist: \"%s\""); |
| addWritablePath( |
| sandboxExecRoot, |
| writablePaths, |
| Preconditions.checkNotNull(env.get("TMP")), |
| "Cannot resolve symlinks in TMP because it doesn't exist: \"%s\""); |
| } else { |
| addWritablePath( |
| sandboxExecRoot, |
| writablePaths, |
| Preconditions.checkNotNull(env.get("TMPDIR")), |
| "Cannot resolve symlinks in TMPDIR because it doesn't exist: \"%s\""); |
| } |
| |
| FileSystem fileSystem = sandboxExecRoot.getFileSystem(); |
| for (String writablePath : sandboxOptions.sandboxWritablePath) { |
| Path path = fileSystem.getPath(writablePath); |
| writablePaths.add(path); |
| // TODO(laszlocsomor): Remove if guard when path.resolveSymbolicLinks supports non-symlink |
| // TODO(laszlocsomor): Figure out why OS.getCurrent() != OS.WINDOWS is required, and remove it |
| if (OS.getCurrent() != OS.WINDOWS || path.isSymbolicLink()) { |
| writablePaths.add(path.resolveSymbolicLinks()); |
| } |
| } |
| |
| return writablePaths.build(); |
| } |
| |
| private void addWritablePath( |
| Path sandboxExecRoot, |
| ImmutableSet.Builder<Path> writablePaths, |
| String pathString, |
| String pathDoesNotExistErrorTemplate) |
| throws IOException { |
| Path path = sandboxExecRoot.getRelative(pathString); |
| if (path.startsWith(sandboxExecRoot)) { |
| // We add this path even though it is below sandboxExecRoot (and thus already writable as a |
| // subpath) to take advantage of the side-effect that SymlinkedExecRoot also creates this |
| // needed directory if it doesn't exist yet. |
| writablePaths.add(path); |
| } else if (path.exists()) { |
| // If `path` itself is a symlink, then adding it to `writablePaths` would result in making |
| // the symlink itself writable, not what it points to. Therefore we need to resolve symlinks |
| // in `path`, however for that we need `path` to exist. |
| // |
| // TODO(laszlocsomor): Remove if guard when path.resolveSymbolicLinks supports non-symlink |
| // TODO(laszlocsomor): Figure out why OS.getCurrent() != OS.WINDOWS is required, and remove it |
| if (OS.getCurrent() != OS.WINDOWS || path.isSymbolicLink()) { |
| writablePaths.add(path.resolveSymbolicLinks()); |
| } else { |
| writablePaths.add(path); |
| } |
| } else { |
| throw new IOException(String.format(pathDoesNotExistErrorTemplate, path.getPathString())); |
| } |
| } |
| |
| protected ImmutableSet<Path> getInaccessiblePaths() { |
| return inaccessiblePaths; |
| } |
| |
| protected SandboxOptions getSandboxOptions() { |
| return sandboxOptions; |
| } |
| |
| @Override |
| public void cleanupSandboxBase(Path sandboxBase, TreeDeleter treeDeleter) throws IOException { |
| Path root = sandboxBase.getChild(getName()); |
| if (root.exists()) { |
| for (Path child : root.getDirectoryEntries()) { |
| treeDeleter.deleteTree(child); |
| } |
| } |
| } |
| } |
