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// 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.buildtool;
import static com.google.devtools.build.lib.vfs.FileSystemUtils.createDirectoryAndParents;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.testutil.ManualClock;
import com.google.devtools.build.lib.testutil.TestConstants;
import com.google.devtools.build.lib.vfs.FileSystem;
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 com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
/**
* Tests {@link SymlinkForest}.
*/
@RunWith(JUnit4.class)
public class SymlinkForestTest {
private FileSystem fileSystem;
private Path topDir;
private Path file1;
private Path file2;
private Path aDir;
@Before
public final void initializeFileSystem() throws Exception {
ManualClock clock = new ManualClock();
fileSystem = new InMemoryFileSystem(clock);
}
/*
* Build a directory tree that looks like:
* top-dir/
* file-1
* file-2
* a-dir/
* file-3
* inner-dir/
* link-1 => file-4
* dir-link => b-dir
* file-4
*/
private void createTestDirectoryTree() throws IOException {
topDir = fileSystem.getPath("/top-dir");
file1 = fileSystem.getPath("/top-dir/file-1");
file2 = fileSystem.getPath("/top-dir/file-2");
aDir = fileSystem.getPath("/top-dir/a-dir");
Path bDir = fileSystem.getPath("/top-dir/b-dir");
Path file3 = fileSystem.getPath("/top-dir/a-dir/file-3");
Path innerDir = fileSystem.getPath("/top-dir/a-dir/inner-dir");
Path link1 = fileSystem.getPath("/top-dir/a-dir/inner-dir/link-1");
Path dirLink = fileSystem.getPath("/top-dir/a-dir/inner-dir/dir-link");
Path file4 = fileSystem.getPath("/file-4");
Path file5 = fileSystem.getPath("/top-dir/b-dir/file-5");
topDir.createDirectory();
FileSystemUtils.createEmptyFile(file1);
FileSystemUtils.createEmptyFile(file2);
aDir.createDirectory();
bDir.createDirectory();
FileSystemUtils.createEmptyFile(file3);
innerDir.createDirectory();
link1.createSymbolicLink(file4); // simple symlink
dirLink.createSymbolicLink(bDir);
FileSystemUtils.createEmptyFile(file4);
FileSystemUtils.createEmptyFile(file5);
}
private static String longestPathPrefixStr(String path, String... prefixStrs) {
Set<PathFragment> prefixes = new HashSet<>();
for (String prefix : prefixStrs) {
prefixes.add(new PathFragment(prefix));
}
PathFragment longest = SymlinkForest.longestPathPrefix(new PathFragment(path), prefixes);
return longest != null ? longest.getPathString() : null;
}
@Test
public void testLongestPathPrefix() {
assertEquals("A", longestPathPrefixStr("A/b", "A", "B")); // simple parent
assertEquals("A", longestPathPrefixStr("A", "A", "B")); // self
assertEquals("A/B", longestPathPrefixStr("A/B/c", "A", "A/B")); // want longest
assertNull(longestPathPrefixStr("C/b", "A", "B")); // not found in other parents
assertNull(longestPathPrefixStr("A", "A/B", "B")); // not found in child
assertEquals("A/B/C", longestPathPrefixStr("A/B/C/d/e/f.h", "A/B/C", "B/C/d"));
assertEquals("", longestPathPrefixStr("A/f.h", "", "B/C/d"));
}
@Test
public void testDeleteTreesBelowNotPrefixed() throws IOException {
createTestDirectoryTree();
SymlinkForest.deleteTreesBelowNotPrefixed(topDir, new String[] { "file-"});
assertTrue(file1.exists());
assertTrue(file2.exists());
assertFalse(aDir.exists());
}
private PathFragment createPkg(Path rootA, Path rootB, String pkg) throws IOException {
if (rootA != null) {
createDirectoryAndParents(rootA.getRelative(pkg));
FileSystemUtils.createEmptyFile(rootA.getRelative(pkg).getChild("file"));
}
if (rootB != null) {
createDirectoryAndParents(rootB.getRelative(pkg));
FileSystemUtils.createEmptyFile(rootB.getRelative(pkg).getChild("file"));
}
return new PathFragment(pkg);
}
private void assertLinksTo(Path fromRoot, Path toRoot, String relpart) throws IOException {
assertTrue(fromRoot.getRelative(relpart).isSymbolicLink());
assertEquals(toRoot.getRelative(relpart).asFragment(),
fromRoot.getRelative(relpart).readSymbolicLink());
}
private void assertIsDir(Path root, String relpart) {
assertTrue(root.getRelative(relpart).isDirectory(Symlinks.NOFOLLOW));
}
@Test
public void testPlantLinkForest() throws IOException {
Path rootA = fileSystem.getPath("/A");
Path rootB = fileSystem.getPath("/B");
ImmutableMap<PathFragment, Path> packageRootMap = ImmutableMap.<PathFragment, Path>builder()
.put(createPkg(rootA, rootB, "pkgA"), rootA)
.put(createPkg(rootA, rootB, "dir1/pkgA"), rootA)
.put(createPkg(rootA, rootB, "dir1/pkgB"), rootB)
.put(createPkg(rootA, rootB, "dir2/pkg"), rootA)
.put(createPkg(rootA, rootB, "dir2/pkg/pkg"), rootB)
.put(createPkg(rootA, rootB, "pkgB"), rootB)
.put(createPkg(rootA, rootB, "pkgB/dir/pkg"), rootA)
.put(createPkg(rootA, rootB, "pkgB/pkg"), rootA)
.put(createPkg(rootA, rootB, "pkgB/pkg/pkg"), rootA)
.build();
createPkg(rootA, rootB, "pkgB/dir"); // create a file in there
Path linkRoot = fileSystem.getPath("/linkRoot");
createDirectoryAndParents(linkRoot);
new SymlinkForest(packageRootMap, linkRoot, TestConstants.PRODUCT_NAME).plantSymlinkForest();
assertLinksTo(linkRoot, rootA, "pkgA");
assertIsDir(linkRoot, "dir1");
assertLinksTo(linkRoot, rootA, "dir1/pkgA");
assertLinksTo(linkRoot, rootB, "dir1/pkgB");
assertIsDir(linkRoot, "dir2");
assertIsDir(linkRoot, "dir2/pkg");
assertLinksTo(linkRoot, rootA, "dir2/pkg/file");
assertLinksTo(linkRoot, rootB, "dir2/pkg/pkg");
assertIsDir(linkRoot, "pkgB");
assertIsDir(linkRoot, "pkgB/dir");
assertLinksTo(linkRoot, rootB, "pkgB/dir/file");
assertLinksTo(linkRoot, rootA, "pkgB/dir/pkg");
assertLinksTo(linkRoot, rootA, "pkgB/pkg");
}
}
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