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// Copyright 2014 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.bazel.repository;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.bazel.rules.workspace.HttpArchiveRule;
import com.google.devtools.build.lib.packages.AggregatingAttributeMapper;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.rules.repository.RepositoryDirectoryValue;
import com.google.devtools.build.lib.rules.repository.RepositoryFunction;
import com.google.devtools.build.lib.syntax.Type;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.skyframe.SkyFunction.Environment;
import com.google.devtools.build.skyframe.SkyFunctionException.Transience;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
/**
* Downloads a file over HTTP.
*/
public class HttpArchiveFunction extends RepositoryFunction {
@Override
public boolean isLocal() {
return false;
}
protected void createDirectory(Path path)
throws RepositoryFunctionException {
try {
FileSystemUtils.createDirectoryAndParents(path);
} catch (IOException e) {
throw new RepositoryFunctionException(e, Transience.TRANSIENT);
}
}
@Override
public SkyValue fetch(Rule rule, Path outputDirectory, Environment env)
throws RepositoryFunctionException, InterruptedException {
// The output directory is always under .external-repository (to stay out of the way of
// artifacts from this repository) and uses the rule's name to avoid conflicts with other
// remote repository rules. For example, suppose you had the following WORKSPACE file:
//
// http_archive(name = "png", url = "http://example.com/downloads/png.tar.gz", sha256 = "...")
//
// This would download png.tar.gz to .external-repository/png/png.tar.gz.
createDirectory(outputDirectory);
Path downloadedPath = HttpDownloader.download(rule, outputDirectory, env.getListener());
DecompressorValue.decompress(getDescriptor(rule, downloadedPath, outputDirectory));
return RepositoryDirectoryValue.create(outputDirectory);
}
protected DecompressorDescriptor getDescriptor(Rule rule, Path downloadPath, Path outputDirectory)
throws RepositoryFunctionException {
DecompressorDescriptor.Builder builder = DecompressorDescriptor.builder()
.setTargetKind(rule.getTargetKind())
.setTargetName(rule.getName())
.setArchivePath(downloadPath)
.setRepositoryPath(outputDirectory);
AggregatingAttributeMapper mapper = AggregatingAttributeMapper.of(rule);
if (mapper.has("strip_prefix", Type.STRING)) {
builder.setPrefix(mapper.get("strip_prefix", Type.STRING));
}
return builder.build();
}
@Override
public Class<? extends RuleDefinition> getRuleDefinition() {
return HttpArchiveRule.class;
}
}
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