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Avoid adding layers for buildpacks that exist in the builder
This commit adds validation of any buildpacks that are specified for image building to match them against buildpacks that are bundled in the builder. If an image buildpack's ID, version, and one layer hash match the same information stored in a label on the builder image, that buildpack won't be added and the buildpack bundled in the builder will be used instead. This reduces the chance of adding to the total count of layers in a builder image unnecessarily. Fixes gh-31233
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.../main/java/org/springframework/boot/buildpack/platform/build/BuildpackLayersMetadata.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| /* | ||
| * Copyright 2012-2022 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. | ||
| */ | ||
|
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| package org.springframework.boot.buildpack.platform.build; | ||
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| import java.io.IOException; | ||
| import java.lang.invoke.MethodHandles; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
|
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| import com.fasterxml.jackson.databind.JsonNode; | ||
|
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| import org.springframework.boot.buildpack.platform.docker.type.Image; | ||
| import org.springframework.boot.buildpack.platform.docker.type.ImageConfig; | ||
| import org.springframework.boot.buildpack.platform.json.MappedObject; | ||
| import org.springframework.boot.buildpack.platform.json.SharedObjectMapper; | ||
| import org.springframework.util.Assert; | ||
| import org.springframework.util.StringUtils; | ||
|
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| /** | ||
| * Buildpack layers metadata information. | ||
| * | ||
| * @author Scott Frederick | ||
| */ | ||
| final class BuildpackLayersMetadata extends MappedObject { | ||
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| private static final String LABEL_NAME = "io.buildpacks.buildpack.layers"; | ||
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| private final Buildpacks buildpacks; | ||
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| private BuildpackLayersMetadata(JsonNode node) { | ||
| super(node, MethodHandles.lookup()); | ||
| this.buildpacks = Buildpacks.fromJson(getNode()); | ||
| } | ||
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| /** | ||
| * Return the metadata details of a buildpack with the given ID and version. | ||
| * @param id the buildpack ID | ||
| * @param version the buildpack version | ||
| * @return the buildpack details or {@code null} if a buildpack with the given ID and | ||
| * version does not exist in the metadata | ||
| */ | ||
| BuildpackLayerDetails getBuildpack(String id, String version) { | ||
| return this.buildpacks.getBuildpack(id, version); | ||
| } | ||
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| /** | ||
| * Create a {@link BuildpackLayersMetadata} from an image. | ||
| * @param image the source image | ||
| * @return the buildpack layers metadata | ||
| * @throws IOException on IO error | ||
| */ | ||
| static BuildpackLayersMetadata fromImage(Image image) throws IOException { | ||
| Assert.notNull(image, "Image must not be null"); | ||
| return fromImageConfig(image.getConfig()); | ||
| } | ||
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| /** | ||
| * Create a {@link BuildpackLayersMetadata} from image config. | ||
| * @param imageConfig the source image config | ||
| * @return the buildpack layers metadata | ||
| * @throws IOException on IO error | ||
| */ | ||
| static BuildpackLayersMetadata fromImageConfig(ImageConfig imageConfig) throws IOException { | ||
| Assert.notNull(imageConfig, "ImageConfig must not be null"); | ||
| String json = imageConfig.getLabels().get(LABEL_NAME); | ||
| Assert.notNull(json, () -> "No '" + LABEL_NAME + "' label found in image config labels '" | ||
| + StringUtils.collectionToCommaDelimitedString(imageConfig.getLabels().keySet()) + "'"); | ||
| return fromJson(json); | ||
| } | ||
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| /** | ||
| * Create a {@link BuildpackLayersMetadata} from JSON. | ||
| * @param json the source JSON | ||
| * @return the buildpack layers metadata | ||
| * @throws IOException on IO error | ||
| */ | ||
| static BuildpackLayersMetadata fromJson(String json) throws IOException { | ||
| return fromJson(SharedObjectMapper.get().readTree(json)); | ||
| } | ||
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| /** | ||
| * Create a {@link BuildpackLayersMetadata} from JSON. | ||
| * @param node the source JSON | ||
| * @return the buildpack layers metadata | ||
| */ | ||
| static BuildpackLayersMetadata fromJson(JsonNode node) { | ||
| return new BuildpackLayersMetadata(node); | ||
| } | ||
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| private static class Buildpacks { | ||
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| private final Map<String, BuildpackVersions> buildpacks = new HashMap<>(); | ||
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| private BuildpackLayerDetails getBuildpack(String id, String version) { | ||
| if (this.buildpacks.containsKey(id)) { | ||
| return this.buildpacks.get(id).getBuildpack(version); | ||
| } | ||
| return null; | ||
| } | ||
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| private void addBuildpackVersions(String id, BuildpackVersions versions) { | ||
| this.buildpacks.put(id, versions); | ||
| } | ||
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| private static Buildpacks fromJson(JsonNode node) { | ||
| Buildpacks buildpacks = new Buildpacks(); | ||
| node.fields().forEachRemaining((field) -> buildpacks.addBuildpackVersions(field.getKey(), | ||
| BuildpackVersions.fromJson(field.getValue()))); | ||
| return buildpacks; | ||
| } | ||
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| } | ||
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| private static class BuildpackVersions { | ||
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| private final Map<String, BuildpackLayerDetails> versions = new HashMap<>(); | ||
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| private BuildpackLayerDetails getBuildpack(String version) { | ||
| return this.versions.get(version); | ||
| } | ||
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| private void addBuildpackVersion(String version, BuildpackLayerDetails details) { | ||
| this.versions.put(version, details); | ||
| } | ||
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| private static BuildpackVersions fromJson(JsonNode node) { | ||
| BuildpackVersions versions = new BuildpackVersions(); | ||
| node.fields().forEachRemaining((field) -> versions.addBuildpackVersion(field.getKey(), | ||
| BuildpackLayerDetails.fromJson(field.getValue()))); | ||
| return versions; | ||
| } | ||
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| } | ||
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| static final class BuildpackLayerDetails extends MappedObject { | ||
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| private final String name; | ||
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| private final String homepage; | ||
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| private final String layerDiffId; | ||
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| private BuildpackLayerDetails(JsonNode node) { | ||
| super(node, MethodHandles.lookup()); | ||
| this.name = valueAt("/name", String.class); | ||
| this.homepage = valueAt("/homepage", String.class); | ||
| this.layerDiffId = valueAt("/layerDiffID", String.class); | ||
| } | ||
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| /** | ||
| * Return the buildpack name. | ||
| * @return the name | ||
| */ | ||
| String getName() { | ||
| return this.name; | ||
| } | ||
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| /** | ||
| * Return the buildpack homepage address. | ||
| * @return the homepage address | ||
| */ | ||
| String getHomepage() { | ||
| return this.homepage; | ||
| } | ||
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| /** | ||
| * Return the buildpack layer {@code diffID}. | ||
| * @return the layer {@code diffID} | ||
| */ | ||
| String getLayerDiffId() { | ||
| return this.layerDiffId; | ||
| } | ||
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| private static BuildpackLayerDetails fromJson(JsonNode node) { | ||
| return new BuildpackLayerDetails(node); | ||
| } | ||
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| } | ||
|
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| } |
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