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DirectoryBuildpack.java
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DirectoryBuildpack.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.InputStream;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import org.springframework.boot.buildpack.platform.docker.type.Layer;
import org.springframework.boot.buildpack.platform.io.Content;
import org.springframework.boot.buildpack.platform.io.FilePermissions;
import org.springframework.boot.buildpack.platform.io.IOConsumer;
import org.springframework.boot.buildpack.platform.io.Layout;
import org.springframework.boot.buildpack.platform.io.Owner;
import org.springframework.util.Assert;
/**
* A {@link Buildpack} that references a buildpack in a directory on the local file
* system.
*
* The file system must contain a buildpack descriptor named {@code buildpack.toml} in the
* root of the directory. The contents of the directory tree will be provided as a single
* layer to be included in the builder image.
*
* @author Scott Frederick
*/
final class DirectoryBuildpack implements Buildpack {
private final Path path;
private final BuildpackCoordinates coordinates;
private DirectoryBuildpack(Path path) {
this.path = path;
this.coordinates = findBuildpackCoordinates(path);
}
private BuildpackCoordinates findBuildpackCoordinates(Path path) {
Path buildpackToml = path.resolve("buildpack.toml");
Assert.isTrue(Files.exists(buildpackToml),
() -> "Buildpack descriptor 'buildpack.toml' is required in buildpack '" + path + "'");
try {
try (InputStream inputStream = Files.newInputStream(buildpackToml)) {
return BuildpackCoordinates.fromToml(inputStream, path);
}
}
catch (IOException ex) {
throw new IllegalArgumentException("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.of(this::addLayerContent));
}
private void addLayerContent(Layout layout) throws IOException {
String id = this.coordinates.getSanitizedId();
Path cnbPath = Paths.get("/cnb/buildpacks/", id, this.coordinates.getVersion());
writeBasePathEntries(layout, cnbPath);
Files.walkFileTree(this.path, new LayoutFileVisitor(this.path, cnbPath, layout));
}
private void writeBasePathEntries(Layout layout, Path basePath) throws IOException {
int pathCount = basePath.getNameCount();
for (int pathIndex = 1; pathIndex < pathCount + 1; pathIndex++) {
String name = "/" + basePath.subpath(0, pathIndex) + "/";
layout.directory(name, Owner.ROOT);
}
}
/**
* A {@link BuildpackResolver} compatible method to resolve directory 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.isDirectory(path)) {
return new DirectoryBuildpack(path);
}
return null;
}
/**
* {@link SimpleFileVisitor} to used to create the {@link Layout}.
*/
private static class LayoutFileVisitor extends SimpleFileVisitor<Path> {
private final Path basePath;
private final Path layerPath;
private final Layout layout;
LayoutFileVisitor(Path basePath, Path layerPath, Layout layout) {
this.basePath = basePath;
this.layerPath = layerPath;
this.layout = layout;
}
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
if (!dir.equals(this.basePath)) {
this.layout.directory(relocate(dir), Owner.ROOT, getMode(dir));
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
this.layout.file(relocate(file), Owner.ROOT, getMode(file), Content.of(file.toFile()));
return FileVisitResult.CONTINUE;
}
private int getMode(Path path) throws IOException {
try {
return FilePermissions.umaskForPath(path);
}
catch (IllegalStateException ex) {
throw new IllegalStateException(
"Buildpack content in a directory is not supported on this operating system");
}
}
private String relocate(Path path) {
Path node = path.subpath(this.basePath.getNameCount(), path.getNameCount());
return Paths.get(this.layerPath.toString(), node.toString()).toString();
}
}
}