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TarGzipBuildpack.java
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TarGzipBuildpack.java
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/*
* Copyright 2012-2021 the original author or authors.
*
* 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
*
* https://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 org.springframework.boot.buildpack.platform.build;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.springframework.boot.buildpack.platform.docker.type.Layer;
import org.springframework.boot.buildpack.platform.io.IOConsumer;
import org.springframework.util.StreamUtils;
/**
* A {@link Buildpack} that references a buildpack contained in a local gzipped tar
* archive file.
*
* The archive must contain a buildpack descriptor named {@code buildpack.toml} at the
* root of the archive. The contents of the archive will be provided as a single layer to
* be included in the builder image.
*
* @author Scott Frederick
*/
final class TarGzipBuildpack implements Buildpack {
private final Path path;
private final BuildpackCoordinates coordinates;
private TarGzipBuildpack(Path path) {
this.path = path;
this.coordinates = findBuildpackCoordinates(path);
}
private BuildpackCoordinates findBuildpackCoordinates(Path path) {
try {
try (TarArchiveInputStream tar = new TarArchiveInputStream(
new GzipCompressorInputStream(Files.newInputStream(path)))) {
ArchiveEntry entry = tar.getNextEntry();
while (entry != null) {
if ("buildpack.toml".equals(entry.getName())) {
return BuildpackCoordinates.fromToml(tar, path);
}
entry = tar.getNextEntry();
}
throw new IllegalArgumentException(
"Buildpack descriptor 'buildpack.toml' is required in buildpack '" + path + "'");
}
}
catch (IOException ex) {
throw new RuntimeException("Error parsing descriptor for buildpack '" + path + "'", ex);
}
}
@Override
public BuildpackCoordinates getCoordinates() {
return this.coordinates;
}
@Override
public void apply(IOConsumer<Layer> layers) throws IOException {
layers.accept(Layer.fromTarArchive(this::copyAndRebaseEntries));
}
private void copyAndRebaseEntries(OutputStream outputStream) throws IOException {
String id = this.coordinates.getSanitizedId();
Path basePath = Paths.get("/cnb/buildpacks/", id, this.coordinates.getVersion());
try (TarArchiveInputStream tar = new TarArchiveInputStream(
new GzipCompressorInputStream(Files.newInputStream(this.path)));
TarArchiveOutputStream output = new TarArchiveOutputStream(outputStream)) {
writeBasePathEntries(output, basePath);
TarArchiveEntry entry = tar.getNextTarEntry();
while (entry != null) {
entry.setName(basePath + "/" + entry.getName());
output.putArchiveEntry(entry);
StreamUtils.copy(tar, output);
output.closeArchiveEntry();
entry = tar.getNextTarEntry();
}
output.finish();
}
}
private void writeBasePathEntries(TarArchiveOutputStream output, Path basePath) throws IOException {
int pathCount = basePath.getNameCount();
for (int pathIndex = 1; pathIndex < pathCount + 1; pathIndex++) {
String name = "/" + basePath.subpath(0, pathIndex) + "/";
TarArchiveEntry entry = new TarArchiveEntry(name);
output.putArchiveEntry(entry);
output.closeArchiveEntry();
}
}
/**
* A {@link BuildpackResolver} compatible method to resolve tar-gzip buildpacks.
* @param context the resolver context
* @param reference the buildpack reference
* @return the resolved {@link Buildpack} or {@code null}
*/
static Buildpack resolve(BuildpackResolverContext context, BuildpackReference reference) {
Path path = reference.asPath();
if (path != null && Files.exists(path) && Files.isRegularFile(path)) {
return new TarGzipBuildpack(path);
}
return null;
}
}