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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.analysis.config;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.ArtifactFactory;
import com.google.devtools.build.lib.actions.EnvironmentalExecException;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.vfs.Dirent;
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 com.google.devtools.build.lib.vfs.Symlinks;
import java.io.IOException;
/**
* Initializes the <execRoot>/_bin/ directory that contains auxiliary tools used during action
* execution (alarm, etc). The main purpose of this is to make sure that those tools are accessible
* using relative paths from the execution root.
*/
public final class BinTools {
private final BlazeDirectories directories;
private final Path binDir; // the working bin directory under execRoot
private final ImmutableList<String> embeddedTools;
private BinTools(BlazeDirectories directories, ImmutableList<String> tools) {
this.directories = directories;
this.binDir = directories.getExecRoot().getRelative("_bin");
this.embeddedTools = tools;
}
/**
* Creates an instance with the list of embedded tools obtained from scanning the directory
* into which said binaries were extracted by the launcher.
*/
public static BinTools forProduction(BlazeDirectories directories) throws IOException {
ImmutableList.Builder<String> builder = ImmutableList.builder();
scanDirectoryRecursively(builder, directories.getEmbeddedBinariesRoot(), "");
return new BinTools(directories, builder.build());
}
/**
* Creates an empty instance for testing.
*/
@VisibleForTesting
public static BinTools empty(BlazeDirectories directories) {
return new BinTools(directories, ImmutableList.<String>of());
}
/**
* Creates an instance for testing without actually symlinking the tools.
*
* <p>Used for tests that need a set of embedded tools to be present, but not the actual files.
*/
@VisibleForTesting
public static BinTools forUnitTesting(BlazeDirectories directories, Iterable<String> tools) {
return new BinTools(directories, ImmutableList.copyOf(tools));
}
/**
* Populates the _bin directory by symlinking the necessary files from the given
* srcDir, and returns the corresponding BinTools.
*/
@VisibleForTesting
public static BinTools forIntegrationTesting(
BlazeDirectories directories, String srcDir, Iterable<String> tools)
throws IOException {
Path srcPath = directories.getOutputBase().getFileSystem().getPath(srcDir);
for (String embedded : tools) {
Path runfilesPath = srcPath.getRelative(embedded);
if (!runfilesPath.isFile()) {
// The file isn't there - nothing to symlink!
//
// Note: This path is usually taken by the tests using the in-memory
// file system. They can't run the embedded scripts anyhow, so there isn't
// much point in creating a symlink to a non-existent binary here.
continue;
}
Path outputPath = directories.getExecRoot().getChild("_bin").getChild(embedded);
if (outputPath.exists()) {
outputPath.delete();
}
FileSystemUtils.createDirectoryAndParents(outputPath.getParentDirectory());
outputPath.createSymbolicLink(runfilesPath);
}
return new BinTools(directories, ImmutableList.copyOf(tools));
}
private static void scanDirectoryRecursively(
ImmutableList.Builder<String> result, Path root, String relative) throws IOException {
for (Dirent dirent : root.readdir(Symlinks.NOFOLLOW)) {
String childRelative = relative.isEmpty()
? dirent.getName()
: relative + "/" + dirent.getName();
switch (dirent.getType()) {
case FILE:
result.add(childRelative);
break;
case DIRECTORY:
scanDirectoryRecursively(result, root.getChild(dirent.getName()), childRelative);
break;
default:
// Nothing to do here -- we ignore symlinks, since they should not be present in the
// embedded binaries tree.
break;
}
}
}
public PathFragment getExecPath(String embedPath) {
Preconditions.checkState(embeddedTools.contains(embedPath), "%s not in %s", embedPath,
embeddedTools);
return new PathFragment("_bin").getRelative(new PathFragment(embedPath).getBaseName());
}
public Artifact getEmbeddedArtifact(String embedPath, ArtifactFactory artifactFactory) {
return artifactFactory.getDerivedArtifact(getExecPath(embedPath));
}
public ImmutableList<Artifact> getAllEmbeddedArtifacts(ArtifactFactory artifactFactory) {
ImmutableList.Builder<Artifact> builder = ImmutableList.builder();
for (String embeddedTool : embeddedTools) {
builder.add(getEmbeddedArtifact(embeddedTool, artifactFactory));
}
return builder.build();
}
/**
* Initializes the build tools not available at absolute paths. Note that
* these must be constant across all configurations.
*/
public void setupBuildTools() throws ExecException {
try {
FileSystemUtils.createDirectoryAndParents(binDir);
} catch (IOException e) {
throw new EnvironmentalExecException("could not create directory '" + binDir + "'", e);
}
for (String embeddedPath : embeddedTools) {
setupTool(embeddedPath);
}
}
private void setupTool(String embeddedPath) throws ExecException {
Path sourcePath = directories.getEmbeddedBinariesRoot().getRelative(embeddedPath);
Path linkPath = binDir.getRelative(new PathFragment(embeddedPath).getBaseName());
linkTool(sourcePath, linkPath);
}
private void linkTool(Path sourcePath, Path linkPath) throws ExecException {
if (linkPath.getFileSystem().supportsSymbolicLinks()) {
try {
if (!linkPath.isSymbolicLink()) {
// ensureSymbolicLink() does not handle the case where there is already
// a file with the same name, so we need to handle it here.
linkPath.delete();
}
FileSystemUtils.ensureSymbolicLink(linkPath, sourcePath);
} catch (IOException e) {
throw new EnvironmentalExecException("failed to link '" + sourcePath + "'", e);
}
} else {
// For file systems that do not support linking, copy.
try {
FileSystemUtils.copyTool(sourcePath, linkPath);
} catch (IOException e) {
throw new EnvironmentalExecException("failed to copy '" + sourcePath + "'" , e);
}
}
}
}
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