Download the metadata repository as a publishable artifact

This commit introduces a task which is responsible for downloading the
current metadata repository version and bundle it as a publishable artifact.
This means that the ZIP file of the metadata repository is going to be
downloaded from the GraalVM metadata repository, and published as a
_classified_ artifact on the `graalvm-reachability-metadata` module.

It is possible to check the result by calling:

    ./gradlew graalvm-reachability-metadata:pAPTCR

and checking the contents of the `build/common-repo` directory. A file
named `graalvm-reachability-metadata-<nbt version>-repository.zip` file
should be visible.

This will make it possible to consume the metadata repository as a Maven
artifact.

build-logic/reachability-plugins/build.gradle.kts

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * The Universal Permissive License (UPL), Version 1.0
+ *
+ * Subject to the condition set forth below, permission is hereby granted to any
+ * person obtaining a copy of this software, associated documentation and/or
+ * data (collectively the "Software"), free of charge and under any and all
+ * copyright rights in the Software, and any and all patent rights owned or
+ * freely licensable by each licensor hereunder covering either (i) the
+ * unmodified Software as contributed to or provided by such licensor, or (ii)
+ * the Larger Works (as defined below), to deal in both
+ *
+ * (a) the Software, and
+ *
+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+ * one is included with the Software each a "Larger Work" to which the Software
+ * is contributed by such licensors),
+ *
+ * without restriction, including without limitation the rights to copy, create
+ * derivative works of, display, perform, and distribute the Software and make,
+ * use, sell, offer for sale, import, export, have made, and have sold the
+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
+ * either these or other terms.
+ *
+ * This license is subject to the following condition:
+ *
+ * The above copyright notice and either this complete permission notice or at a
+ * minimum a reference to the UPL must be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+plugins {
+    java
+    `kotlin-dsl`
+}
+
+repositories {
+    mavenCentral()
+    gradlePluginPortal()
+}
+
+dependencies {
+    implementation(":common-plugins")
+}

build-logic/reachability-plugins/settings.gradle.kts

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2020, 2021 Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * The Universal Permissive License (UPL), Version 1.0
+ *
+ * Subject to the condition set forth below, permission is hereby granted to any
+ * person obtaining a copy of this software, associated documentation and/or
+ * data (collectively the "Software"), free of charge and under any and all
+ * copyright rights in the Software, and any and all patent rights owned or
+ * freely licensable by each licensor hereunder covering either (i) the
+ * unmodified Software as contributed to or provided by such licensor, or (ii)
+ * the Larger Works (as defined below), to deal in both
+ *
+ * (a) the Software, and
+ *
+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+ * one is included with the Software each a "Larger Work" to which the Software
+ * is contributed by such licensors),
+ *
+ * without restriction, including without limitation the rights to copy, create
+ * derivative works of, display, perform, and distribute the Software and make,
+ * use, sell, offer for sale, import, export, have made, and have sold the
+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
+ * either these or other terms.
+ *
+ * This license is subject to the following condition:
+ *
+ * The above copyright notice and either this complete permission notice or at a
+ * minimum a reference to the UPL must be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+rootProject.name = "reachability-plugins"
+
+pluginManagement {
+    includeBuild("../settings-plugins")
+}
+
+includeBuild("../common-plugins")
+
+plugins {
+    id("org.graalvm.build.common")
+}

build-logic/reachability-plugins/src/main/java/org/graalvm/build/FetchRepositoryMetadata.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2003-2021 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.graalvm.build;
+
+import org.gradle.api.DefaultTask;
+import org.gradle.api.file.DirectoryProperty;
+import org.gradle.api.file.FileSystemOperations;
+import org.gradle.api.file.RegularFile;
+import org.gradle.api.provider.Property;
+import org.gradle.api.provider.Provider;
+import org.gradle.api.tasks.CacheableTask;
+import org.gradle.api.tasks.Input;
+import org.gradle.api.tasks.Internal;
+import org.gradle.api.tasks.OutputDirectory;
+import org.gradle.api.tasks.TaskAction;
+
+import javax.inject.Inject;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.net.URI;
+import java.nio.channels.Channels;
+import java.nio.channels.FileChannel;
+import java.nio.channels.ReadableByteChannel;
+
+@CacheableTask
+public abstract class FetchRepositoryMetadata extends DefaultTask {
+    @Input
+    public abstract Property<String> getVersion();
+
+    @Input
+    public abstract Property<String> getRepositoryUrlTemplate();
+
+    @OutputDirectory
+    public abstract DirectoryProperty getOutputDirectory();
+
+    @Inject
+    protected abstract FileSystemOperations getFileSystemOperations();
+
+    @Internal
+    public Provider<RegularFile> getOutputFile() {
+        return getOutputDirectory().file("repository.zip");
+    }
+
+    public FetchRepositoryMetadata() {
+        getOutputs().doNotCacheIf("Snapshot version", task -> getVersion().get().endsWith("-SNAPSHOT"));
+        getRepositoryUrlTemplate().convention("https://github.com/oracle/graalvm-reachability-metadata/releases/download/%1$s/graalvm-reachability-metadata-%1$s.zip");
+    }
+
+    @TaskAction
+    public void fetchMetadataRepository() {
+        String url = String.format(getRepositoryUrlTemplate().get(), getVersion().get());
+        File tmpFile = new File(getTemporaryDir(), "repository.zip");
+        try (ReadableByteChannel channel = Channels.newChannel(new URI(url).toURL().openStream())) {
+            try (FileChannel outChannel = new FileOutputStream(tmpFile).getChannel()) {
+                outChannel.transferFrom(channel, 0, Long.MAX_VALUE);
+            }
+        } catch (Exception e) {
+            throw new RuntimeException("Could not download repository metadata from " + url, e);
+        }
+        getFileSystemOperations().copy(spec -> {
+            spec.from(tmpFile);
+            spec.into(getOutputDirectory());
+        });
+        tmpFile.delete();
+    }
+}

build-logic/reachability-plugins/src/main/kotlin/org.graalvm.build.reachability-module.gradle.kts

@@ -0,0 +1,71 @@
+import org.graalvm.build.FetchRepositoryMetadata
+
+/*
+ * Copyright (c) 2020, 2022 Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * The Universal Permissive License (UPL), Version 1.0
+ *
+ * Subject to the condition set forth below, permission is hereby granted to any
+ * person obtaining a copy of this software, associated documentation and/or
+ * data (collectively the "Software"), free of charge and under any and all
+ * copyright rights in the Software, and any and all patent rights owned or
+ * freely licensable by each licensor hereunder covering either (i) the
+ * unmodified Software as contributed to or provided by such licensor, or (ii)
+ * the Larger Works (as defined below), to deal in both
+ *
+ * (a) the Software, and
+ *
+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+ * one is included with the Software each a "Larger Work" to which the Software
+ * is contributed by such licensors),
+ *
+ * without restriction, including without limitation the rights to copy, create
+ * derivative works of, display, perform, and distribute the Software and make,
+ * use, sell, offer for sale, import, export, have made, and have sold the
+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
+ * either these or other terms.
+ *
+ * This license is subject to the following condition:
+ *
+ * The above copyright notice and either this complete permission notice or at a
+ * minimum a reference to the UPL must be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+plugins {
+    checkstyle
+    id("org.graalvm.build.java")
+    id("org.graalvm.build.publishing")
+}
+
+tasks.withType<Test>().configureEach {
+    useJUnitPlatform()
+}
+
+val fetchRepository = tasks.register<FetchRepositoryMetadata>("fetchMetadataRepository") {
+    outputDirectory.convention(layout.buildDirectory.dir("repository"))
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            from(components["java"])
+            artifact(fetchRepository.flatMap { it.outputFile }) {
+                classifier = "repository"
+            }
+        }
+    }
+}
+
+tasks.withType<Checkstyle>().configureEach {
+    setConfigFile(layout.projectDirectory.dir("../../config/checkstyle.xml").asFile)
+}

common/graalvm-reachability-metadata/build.gradle.kts

@@ -1,3 +1,5 @@
+import org.graalvm.build.FetchRepositoryMetadata
+
 /*
  * Copyright (c) 2020, 2022 Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
@@ -40,9 +42,7 @@
  */
 
 plugins {
-    checkstyle
-    id("org.graalvm.build.java")
-    id("org.graalvm.build.publishing")
+    id("org.graalvm.build.reachability-module")
 }
 
 maven {
@@ -56,18 +56,6 @@ dependencies {
     testImplementation(libs.test.junit.jupiter.core)
 }
 
-tasks.withType<Test>().configureEach {
-    useJUnitPlatform()
-}
-
-publishing {
-    publications {
-        create<MavenPublication>("maven") {
-            from(components["java"])
-        }
-    }
-}
-
-tasks.withType<Checkstyle>().configureEach {
-    setConfigFile(layout.projectDirectory.dir("../../config/checkstyle.xml").asFile)
+tasks.withType<FetchRepositoryMetadata>().configureEach {
+    version.set(libs.versions.metadataRepository)
 }

common/graalvm-reachability-metadata/settings.gradle.kts

@@ -42,6 +42,7 @@
 pluginManagement {
     includeBuild("../../build-logic/settings-plugins")
     includeBuild("../../build-logic/common-plugins")
+    includeBuild("../../build-logic/reachability-plugins")
 }
 
 plugins {