| // Copyright 2017 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.runtime; |
| |
| import com.google.devtools.build.lib.unix.UnixFileSystem; |
| import com.google.devtools.build.lib.util.AbruptExitException; |
| import com.google.devtools.build.lib.util.ExitCode; |
| import com.google.devtools.build.lib.util.OS; |
| import com.google.devtools.build.lib.vfs.FileSystem; |
| import com.google.devtools.build.lib.vfs.FileSystem.HashFunction; |
| import com.google.devtools.build.lib.vfs.JavaIoFileSystem; |
| import com.google.devtools.build.lib.windows.WindowsFileSystem; |
| import com.google.devtools.common.options.OptionsParsingException; |
| import com.google.devtools.common.options.OptionsProvider; |
| |
| /** |
| * Module to provide a {@link FileSystem} instance that uses {@code SHA256} as the default hash |
| * function, or else what's specified by {@code -Dbazel.DigestFunction}. |
| * |
| * <p>For legacy reasons we can't make the {@link FileSystem} class use {@code SHA256} by default. |
| */ |
| public class BazelFileSystemModule extends BlazeModule { |
| |
| @Override |
| public FileSystem getFileSystem(OptionsProvider startupOptions) throws AbruptExitException { |
| final HashFunction hashFunction; |
| String value = null; |
| try { |
| value = System.getProperty("bazel.DigestFunction", "SHA256"); |
| hashFunction = new HashFunction.Converter().convert(value); |
| } catch (OptionsParsingException e) { |
| throw new AbruptExitException( |
| "The specified hash function '" + value + "' is not supported.", |
| ExitCode.COMMAND_LINE_ERROR, |
| e); |
| } |
| if ("0".equals(System.getProperty("io.bazel.EnableJni"))) { |
| // Ignore UnixFileSystem, to be used for bootstrapping. |
| return OS.getCurrent() == OS.WINDOWS |
| ? new WindowsFileSystem(hashFunction) |
| : new JavaIoFileSystem(hashFunction); |
| } |
| // The JNI-based UnixFileSystem is faster, but on Windows it is not available. |
| return OS.getCurrent() == OS.WINDOWS |
| ? new WindowsFileSystem(hashFunction) |
| : new UnixFileSystem(hashFunction); |
| } |
| } |