| // Copyright 2022 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.vfs; |
| |
| import java.io.IOException; |
| |
| /** |
| * Can perform xattrs on {@link Path} objects, including the common {@link Path#getFastDigest}. Some |
| * extensions to Bazel may allow this data to be retrieved in a different way than just accessing |
| * the xattr on the filesystem: they may do bulk filesystem operations for a path/directory at once. |
| * |
| * <p>Warning! these methods are called both *before* and *after* an action executes on its output |
| * files. Thus, implementations must not cache the value for output files or other files like those |
| * in external repositories that are generated during the build. An implementation is free to cache |
| * it for immutable source files for the duration of the build. |
| */ |
| public interface XattrProvider { |
| default byte[] getFastDigest(Path path) throws IOException { |
| return path.getFastDigest(); |
| } |
| |
| default byte[] getxattr(Path path, String xattrName) throws IOException { |
| return path.getxattr(xattrName); |
| } |
| |
| default byte[] getxattr(Path path, String xattrName, Symlinks followSymlinks) throws IOException { |
| return path.getxattr(xattrName, followSymlinks); |
| } |
| |
| /** Delegates to another {@link XattrProvider}. */ |
| class DelegatingXattrProvider implements XattrProvider { |
| private final XattrProvider delegate; |
| |
| public DelegatingXattrProvider(XattrProvider delegate) { |
| this.delegate = delegate; |
| } |
| |
| @Override |
| public byte[] getFastDigest(Path path) throws IOException { |
| return delegate.getFastDigest(path); |
| } |
| |
| @Override |
| public byte[] getxattr(Path path, String xattrName) throws IOException { |
| return delegate.getxattr(path, xattrName); |
| } |
| |
| @Override |
| public byte[] getxattr(Path path, String xattrName, Symlinks followSymlinks) |
| throws IOException { |
| return delegate.getxattr(path, xattrName, followSymlinks); |
| } |
| } |
| } |