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// Copyright 2020 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.common.collect.Iterables.getOnlyElement;
import static com.google.common.truth.Truth.assertThat;
import com.google.devtools.build.lib.buildtool.util.BuildIntegrationTestCase;
import com.google.devtools.build.lib.vfs.Path;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Test that symbolic links are handled correctly by the dependency analysis:
* that changes of the link target cause a rebuild.
*/
@RunWith(JUnit4.class)
public class SymlinkDependencyAnalysisTest extends BuildIntegrationTestCase {
private String buildAndReturnOutput() throws Exception {
buildTarget("//symlink");
return readContentAsLatin1String(getOnlyElement(getArtifacts("//symlink:out")));
}
@Test
public void testSymlinkTargetChangeCausesRebuild() throws Exception {
Path buildFile =
write("symlink/BUILD",
"genrule(name = 'symlink',",
" srcs = ['link'],",
" outs = ['out'],",
" cmd = '/bin/cp $(location link) $(location out)')");
Path target = write("symlink/target", "foo");
Path link = buildFile.getParentDirectory().getChild("link");
link.createSymbolicLink(target);
target.setLastModifiedTime(10000);
assertThat(buildAndReturnOutput()).isEqualTo("foo\n"); // first build
write("symlink/target", "bar");
target.setLastModifiedTime(20000);
assertThat(buildAndReturnOutput()).isEqualTo("bar\n"); // should do a rebuild
}
}