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// Copyright 2018 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.worker;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.sandbox.SymlinkedSandboxedSpawn;
import com.google.devtools.build.lib.vfs.FileStatus;
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;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
/** Creates and manages the contents of a working directory of a persistent worker. */
final class WorkerExecRoot extends SymlinkedSandboxedSpawn {
private final Path workDir;
private final Set<PathFragment> workerFiles;
public WorkerExecRoot(
Path workDir,
Map<PathFragment, Path> inputs,
Collection<PathFragment> outputs,
Set<PathFragment> workerFiles) {
super(
workDir,
workDir,
ImmutableList.of(),
ImmutableMap.of(),
inputs,
outputs,
ImmutableSet.of());
this.workDir = workDir;
this.workerFiles = workerFiles;
}
@Override
public void createFileSystem() throws IOException {
workDir.createDirectoryAndParents();
deleteExceptAllowedFiles(workDir, workerFiles);
super.createFileSystem();
}
private void deleteExceptAllowedFiles(Path root, Set<PathFragment> allowedFiles)
throws IOException {
for (Path p : root.getDirectoryEntries()) {
FileStatus stat = p.stat(Symlinks.NOFOLLOW);
if (!stat.isDirectory()) {
if (!allowedFiles.contains(p.relativeTo(workDir))) {
p.delete();
}
} else {
deleteExceptAllowedFiles(p, allowedFiles);
if (p.readdir(Symlinks.NOFOLLOW).isEmpty()) {
p.delete();
}
}
}
}
@Override
protected void createInputs(Map<PathFragment, Path> inputs) throws IOException {
// All input files are relative to the execroot.
for (Map.Entry<PathFragment, Path> entry : inputs.entrySet()) {
Path key = workDir.getRelative(entry.getKey());
FileStatus keyStat = key.statNullable(Symlinks.NOFOLLOW);
if (keyStat != null) {
if (keyStat.isSymbolicLink()
&& entry.getValue() != null
&& key.readSymbolicLink().equals(entry.getValue().asFragment())) {
continue;
}
key.delete();
}
// A null value means that we're supposed to create an empty file as the input.
if (entry.getValue() != null) {
key.createSymbolicLink(entry.getValue());
} else {
FileSystemUtils.createEmptyFile(key);
}
}
}
}
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