// 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.devtools.build.lib.actions.ExecutionStrategy;
import com.google.devtools.build.lib.actions.SpawnActionContext;
import com.google.devtools.build.lib.buildtool.BuildRequest;
import com.google.devtools.build.lib.runtime.CommandEnvironment;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import java.io.IOException;

/** Strategy that uses sandboxing to execute a process. */
// TODO(ulfjack): This class only exists for this annotation. Find a better way to handle this!
@ExecutionStrategy(
  name = {"sandboxed", "linux-sandbox"},
  contextType = SpawnActionContext.class
)
public final class LinuxSandboxedStrategy extends SandboxStrategy {
  private LinuxSandboxedStrategy(
      CommandEnvironment cmdEnv,
      BuildRequest buildRequest,
      Path sandboxBase,
      boolean verboseFailures,
      Path inaccessibleHelperFile,
      Path inaccessibleHelperDir,
      int timeoutGraceSeconds) {
    super(
        verboseFailures,
        new LinuxSandboxedSpawnRunner(
            cmdEnv,
            buildRequest,
            sandboxBase,
            inaccessibleHelperFile,
            inaccessibleHelperDir,
            timeoutGraceSeconds));
  }

  static LinuxSandboxedStrategy create(
      CommandEnvironment cmdEnv,
      BuildRequest buildRequest,
      Path sandboxBase,
      boolean verboseFailures,
      int timeoutGraceSeconds)
      throws IOException {
    Path inaccessibleHelperFile = sandboxBase.getRelative("inaccessibleHelperFile");
    FileSystemUtils.touchFile(inaccessibleHelperFile);
    inaccessibleHelperFile.setReadable(false);
    inaccessibleHelperFile.setWritable(false);
    inaccessibleHelperFile.setExecutable(false);

    Path inaccessibleHelperDir = sandboxBase.getRelative("inaccessibleHelperDir");
    inaccessibleHelperDir.createDirectory();
    inaccessibleHelperDir.setReadable(false);
    inaccessibleHelperDir.setWritable(false);
    inaccessibleHelperDir.setExecutable(false);

    return new LinuxSandboxedStrategy(
        cmdEnv,
        buildRequest,
        sandboxBase,
        verboseFailures,
        inaccessibleHelperFile,
        inaccessibleHelperDir,
        timeoutGraceSeconds);
  }
}