| /* |
| * Copyright 2012-present Facebook, Inc. |
| * |
| * 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.facebook.buck.step.fs; |
| |
| import com.facebook.buck.step.ExecutionContext; |
| import com.facebook.buck.step.Step; |
| import com.facebook.buck.util.MorePaths; |
| import com.google.common.base.Joiner; |
| import com.google.common.base.Preconditions; |
| |
| import java.io.IOException; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| |
| public class SymlinkFileStep implements Step { |
| |
| private final String existingFile; |
| private final String desiredLink; |
| private final boolean useAbsolutePaths; |
| |
| public SymlinkFileStep(String existingFile, String desiredLink, boolean useAbsolutePaths) { |
| this.existingFile = Preconditions.checkNotNull(existingFile); |
| this.desiredLink = Preconditions.checkNotNull(desiredLink); |
| this.useAbsolutePaths = useAbsolutePaths; |
| } |
| |
| /** |
| * Get the path to the existing file that should be linked. |
| */ |
| private Path getExistingFilePath(ExecutionContext context) { |
| // This could be either an absolute or relative path. |
| // TODO ideally all symbolic links should be relative, consider eliminating the absolute option. |
| return (useAbsolutePaths ? getAbsolutePath(existingFile, context) : |
| MorePaths.getRelativePath(Paths.get(existingFile), Paths.get(desiredLink).getParent())); |
| } |
| |
| /** |
| * Get the path to the desired link that should be created. |
| */ |
| private Path getDesiredLinkPath(ExecutionContext context) { |
| return getAbsolutePath(desiredLink, context); |
| } |
| |
| private static Path getAbsolutePath(String path, ExecutionContext context) { |
| return context.getProjectFilesystem().getPathRelativizer().apply(path); |
| } |
| |
| @Override |
| public String getShortName() { |
| return "symlink_file"; |
| } |
| |
| @Override |
| public String getDescription (ExecutionContext context) { |
| return Joiner.on(" ").join( |
| "ln", |
| "-f", |
| "-s", |
| getExistingFilePath(context), |
| getDesiredLinkPath(context)); |
| } |
| |
| @Override |
| public int execute(ExecutionContext context) { |
| Path existingFilePath = getExistingFilePath(context); |
| Path desiredLinkPath = getDesiredLinkPath(context); |
| try { |
| context.getProjectFilesystem().createSymLink( |
| existingFilePath, |
| desiredLinkPath, |
| /* force */ true); |
| return 0; |
| } catch (IOException e) { |
| e.printStackTrace(context.getStdErr()); |
| return 1; |
| } |
| } |
| } |