diff options
Diffstat (limited to 'src/main/java/com/google/devtools/build/lib/sandbox/SymlinkedExecRoot.java')
-rw-r--r-- | src/main/java/com/google/devtools/build/lib/sandbox/SymlinkedExecRoot.java | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/sandbox/SymlinkedExecRoot.java b/src/main/java/com/google/devtools/build/lib/sandbox/SymlinkedExecRoot.java deleted file mode 100644 index a158f02961..0000000000 --- a/src/main/java/com/google/devtools/build/lib/sandbox/SymlinkedExecRoot.java +++ /dev/null @@ -1,160 +0,0 @@ -// Copyright 2016 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.common.io.Files; -import com.google.devtools.build.lib.util.Preconditions; -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.HashSet; -import java.util.Map; -import java.util.Map.Entry; -import java.util.Set; - -/** - * Creates an execRoot for a Spawn that contains input files as symlinks to their original - * destination. - */ -public final class SymlinkedExecRoot implements SandboxExecRoot { - - private final Path sandboxExecRoot; - - public SymlinkedExecRoot(Path sandboxExecRoot) { - this.sandboxExecRoot = sandboxExecRoot; - } - - @Override - public void createFileSystem( - Map<PathFragment, Path> inputs, Collection<PathFragment> outputs, Set<Path> writableDirs) - throws IOException { - Set<Path> createdDirs = new HashSet<>(); - cleanFileSystem(inputs.keySet()); - FileSystemUtils.createDirectoryAndParentsWithCache(createdDirs, sandboxExecRoot); - createParentDirectoriesForInputs(createdDirs, inputs.keySet()); - createInputs(inputs); - createWritableDirectories(createdDirs, writableDirs); - createDirectoriesForOutputs(createdDirs, outputs); - } - - private void cleanFileSystem(Set<PathFragment> allowedFiles) throws IOException { - if (sandboxExecRoot.exists(Symlinks.NOFOLLOW)) { - deleteExceptAllowedFiles(sandboxExecRoot, allowedFiles); - } - } - - 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(sandboxExecRoot))) { - p.delete(); - } - } else { - deleteExceptAllowedFiles(p, allowedFiles); - if (p.readdir(Symlinks.NOFOLLOW).isEmpty()) { - p.delete(); - } - } - } - } - - /** - * No input can be a child of another input, because otherwise we might try to create a symlink - * below another symlink we created earlier - which means we'd actually end up writing somewhere - * in the workspace. - * - * <p>If all inputs were regular files, this situation could naturally not happen - but - * unfortunately, we might get the occasional action that has directories in its inputs. - * - * <p>Creating all parent directories first ensures that we can safely create symlinks to - * directories, too, because we'll get an IOException with EEXIST if inputs happen to be nested - * once we start creating the symlinks for all inputs. - */ - private void createParentDirectoriesForInputs(Set<Path> createdDirs, Set<PathFragment> inputs) - throws IOException { - for (PathFragment inputPath : inputs) { - Path dir = sandboxExecRoot.getRelative(inputPath).getParentDirectory(); - Preconditions.checkArgument( - dir.startsWith(sandboxExecRoot), "Bad relative path: '%s'", inputPath); - FileSystemUtils.createDirectoryAndParentsWithCache(createdDirs, dir); - } - } - - private void createInputs(Map<PathFragment, Path> inputs) throws IOException { - // All input files are relative to the execroot. - for (Entry<PathFragment, Path> entry : inputs.entrySet()) { - Path key = sandboxExecRoot.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); - } - } - } - - private void createWritableDirectories(Set<Path> createdDirs, Set<Path> writableDirs) - throws IOException { - for (Path writablePath : writableDirs) { - if (writablePath.startsWith(sandboxExecRoot)) { - FileSystemUtils.createDirectoryAndParentsWithCache(createdDirs, writablePath); - } - } - } - - /** Prepare the output directories in the sandbox. */ - private void createDirectoriesForOutputs(Set<Path> createdDirs, Collection<PathFragment> outputs) - throws IOException { - for (PathFragment output : outputs) { - FileSystemUtils.createDirectoryAndParentsWithCache( - createdDirs, sandboxExecRoot.getRelative(output.getParentDirectory())); - } - } - - /** Moves all {@code outputs} to {@code execRoot}. */ - @Override - public void copyOutputs(Path execRoot, Collection<PathFragment> outputs) throws IOException { - for (PathFragment output : outputs) { - Path source = sandboxExecRoot.getRelative(output); - Path target = execRoot.getRelative(output); - if (source.isFile() || source.isSymbolicLink()) { - Files.move(source.getPathFile(), target.getPathFile()); - } else if (source.isDirectory()) { - try { - source.renameTo(target); - } catch (IOException e) { - // Failed to move directory directly, thus move it recursively. - target.createDirectory(); - FileSystemUtils.moveTreesBelow(source, target); - } - } - } - } -} |