Add Maven publication

Adds publishing for Maven artifacts, including signing. Includes most prerequisites to publish Maven artifacts to Maven Central.

The build-code parts have been taken from Nessie, including the necessary special treatment of shadow-jars and support to publish a bom.
`./gradlew publishToMavenLocal` works out of the box.

On top of the Nessie parts, this change can also build a source tarball from using `git archive`, plus some Apache project specific adoptions.

Fully signed invocation example, assuming GPG agent (there are alternative ways to provide the GPG key+passphrase):
```bash
./ gradlew \
   publishToMavenLocal \
   sourceTarball \
   -Prelease \
   -PuseGpgAgent
```

This change also introduces a `version.txt`, which contains `999-SNAPSHOT`. Using `999-SNAPSHOT` on the `main` branch makes it easier later on to enable multiple major/minor version branches and releases from those. `version.txt` on a major/minor version branch would contain something like `2.1-SNAPSHOT`. With `999-SNAPSHOT` on the `main` branch eliminates the need to update `version.txt` on the `main` branch when a new major version branch is created, eliminating the need to commit and push to multiple branches from a mostly automated release workflow infrastructure.

.github/workflows/gradle.yml

@@ -58,7 +58,10 @@ jobs:
 
       - name: Check formatting
         run: ./gradlew check
-
+
+      - name: Check Maven publication
+        run: ./gradlew publishToMavenLocal sourceTarball
+
       - name: Build with Gradle Wrapper
         run: ./gradlew test
 

Dockerfile

@@ -31,13 +31,13 @@ WORKDIR /app
 RUN rm -rf build
 
 # Build the rest catalog
-RUN ./gradlew --no-daemon --info -PeclipseLink=$ECLIPSELINK clean shadowJar startScripts
+RUN ./gradlew --no-daemon --info -PeclipseLink=$ECLIPSELINK clean prepareDockerDist
 
 FROM registry.access.redhat.com/ubi9/openjdk-21-runtime:1.20-2.1721752928
 WORKDIR /app
-COPY --from=build /app/polaris-service/build/libs/polaris-service-all.jar /app/lib/polaris-service-all.jar
+COPY --from=build /app/polaris-service/build/docker-dist/bin /app/bin
+COPY --from=build /app/polaris-service/build/docker-dist/lib /app/lib
 COPY --from=build /app/polaris-server.yml /app
-COPY --from=build /app/polaris-service/build/scripts/polaris-service /app/bin/polaris-service
 
 EXPOSE 8181
 

build-logic/build.gradle.kts

@@ -24,5 +24,7 @@ dependencies {
   implementation(baselibs.errorprone)
   implementation(baselibs.idea.ext)
   implementation(baselibs.license.report)
+  implementation(baselibs.nexus.publish)
+  implementation(baselibs.shadow)
   implementation(baselibs.spotless)
 }

build-logic/src/main/kotlin/polaris-java.gradle.kts

@@ -21,6 +21,7 @@ import net.ltgt.gradle.errorprone.errorprone
 import org.gradle.api.tasks.compile.JavaCompile
 import org.gradle.api.tasks.testing.Test
 import org.gradle.kotlin.dsl.named
+import publishing.PublishingHelperPlugin
 
 plugins {
   id("jacoco")
@@ -30,6 +31,8 @@ plugins {
   id("net.ltgt.errorprone")
 }
 
+apply<PublishingHelperPlugin>()
+
 tasks.withType(JavaCompile::class.java).configureEach {
   options.compilerArgs.addAll(listOf("-Xlint:unchecked", "-Xlint:deprecation"))
   options.errorprone.disableAllWarnings = true
@@ -84,6 +87,11 @@ spotless {
 
 dependencies { errorprone(versionCatalogs.named("libs").findLibrary("errorprone").get()) }
 
+java {
+  withJavadocJar()
+  withSourcesJar()
+}
+
 tasks.withType<Javadoc>().configureEach {
   val opt = options as CoreJavadocOptions
   // don't spam log w/ "warning: no @param/@return"

build-logic/src/main/kotlin/polaris-root.gradle.kts

@@ -20,12 +20,16 @@
 import org.jetbrains.gradle.ext.copyright
 import org.jetbrains.gradle.ext.encodings
 import org.jetbrains.gradle.ext.settings
+import publishing.PublishingHelperExtension
+import publishing.PublishingHelperPlugin
 
 plugins {
   id("com.diffplug.spotless")
   id("org.jetbrains.gradle.plugin.idea-ext")
 }
 
+apply<PublishingHelperPlugin>()
+
 spotless {
   kotlinGradle {
     ktfmt().googleStyle()
@@ -57,3 +61,12 @@ if (System.getProperty("idea.sync.active").toBoolean()) {
     }
   }
 }
+
+extensions.getByType<PublishingHelperExtension>().apply {
+  asfProjectName = "polaris"
+
+  mailingLists.addAll("dev", "issues", "commits")
+
+  podlingPpmcAsfIds.addAll("anoop", "ashvin", "jackye", "russellspitzer", "snazy", "vvcephei")
+  podlingCommitterAsfIds.addAll()
+}

build-logic/src/main/kotlin/polaris-shadow-jar.gradle.kts

@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
+
+plugins { id("com.gradleup.shadow") }
+
+val shadowJar = tasks.named<ShadowJar>("shadowJar")
+
+shadowJar.configure {
+  outputs.cacheIf { false } // do not cache uber/shaded jars
+  archiveClassifier = ""
+  mergeServiceFiles()
+}
+
+tasks.named<Jar>("jar").configure {
+  dependsOn(shadowJar)
+  archiveClassifier = "raw"
+}
+
+tasks.withType<ShadowJar>().configureEach {
+  exclude("META-INF/jandex.idx")
+  isZip64 = true
+}

build-logic/src/main/kotlin/publishing/MemoizedGitInfo.kt

@@ -0,0 +1,85 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 publishing
+
+import org.gradle.api.GradleException
+import org.gradle.api.Project
+import org.gradle.api.java.archives.Attributes
+import org.gradle.kotlin.dsl.extra
+import java.io.ByteArrayOutputStream
+import java.nio.charset.StandardCharsets
+
+/**
+ * Container to memoize Git information retrieved via `git` command executions across all Gradle projects.
+ * Jar release artifacts get some attributes added to the jar manifest, which can be quite useful for released jars.
+ */
+internal class MemoizedGitInfo {
+  companion object {
+    private fun execProc(rootProject: Project, cmd: String, vararg args: Any): String {
+      val buf = ByteArrayOutputStream()
+      rootProject.exec {
+        executable = cmd
+        args(args.toList())
+        standardOutput = buf
+      }
+      return buf.toString(StandardCharsets.UTF_8).trim()
+    }
+
+    fun gitInfo(rootProject: Project, attribs: Attributes) {
+      val props = gitInfo(rootProject)
+      attribs.putAll(props)
+    }
+
+    fun gitInfo(rootProject: Project): Map<String, String> {
+      return if (rootProject.extra.has("gitReleaseInfo")) {
+        @Suppress("UNCHECKED_CAST")
+        rootProject.extra["gitReleaseInfo"] as Map<String, String>
+      } else {
+        val isRelease = rootProject.hasProperty("release")
+        val gitHead = execProc(rootProject, "git", "rev-parse", "HEAD")
+        val gitDescribe = if (isRelease) {
+            try {
+              execProc(rootProject, "git", "describe", "--tags")
+            } catch (e: Exception) {
+              throw GradleException("'git describe --tags' failed - no Git tag?", e)
+            }
+        } else {
+            execProc(rootProject, "git", "describe", "--always", "--dirty")
+        }
+        val timestamp = execProc(rootProject, "date", "+%Y-%m-%d-%H:%M:%S%:z")
+        val system = execProc(rootProject, "uname", "-a")
+        val javaVersion = System.getProperty("java.version")
+
+        val info =
+          mapOf(
+            "Apache-Polaris-Version" to rootProject.version.toString(),
+            "Apache-Polaris-Is-Release" to isRelease.toString(),
+            "Apache-Polaris-Build-Git-Head" to gitHead,
+            "Apache-Polaris-Build-Git-Describe" to gitDescribe,
+            "Apache-Polaris-Build-Timestamp" to timestamp,
+            "Apache-Polaris-Build-System" to system,
+            "Apache-Polaris-Build-Java-Version" to javaVersion
+          )
+        rootProject.extra["gitReleaseInfo"] = info
+        return info
+      }
+    }
+  }
+}

build-logic/src/main/kotlin/publishing/PublishingHelperExtension.kt

@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 publishing
+
+import org.gradle.api.Project
+import org.gradle.api.model.ObjectFactory
+import org.gradle.kotlin.dsl.listProperty
+import org.gradle.kotlin.dsl.property
+import java.io.File
+import javax.inject.Inject
+
+/**
+ * Gradle plugin extension object for the `PublishingHelperPlugin. Most attributes are likely never changed from the
+ * default values.
+ *
+ * Apache podlings need to specify the PPMC members and committers manually, Apache TLPs don't populate these
+ * properties.
+ */
+abstract class PublishingHelperExtension
+@Inject
+constructor(objectFactory: ObjectFactory, project: Project)
+{
+  // optional customization of the pom.xml <name> element
+  val mavenName = objectFactory.property<String>().convention(project.provider { project.name })
+
+  val licenseUrl = objectFactory.property<String>().convention("https://www.apache.org/licenses/LICENSE-2.0.txt")
+
+  // the following are only relevant on the root project
+  val asfProjectName = objectFactory.property<String>()
+  val baseName = objectFactory.property<String>().convention(project.provider { "apache-${asfProjectName.get()}-${project.version}" })
+  val distributionDir = objectFactory.directoryProperty().convention(project.layout.buildDirectory.dir("distributions"))
+  val sourceTarball = objectFactory.fileProperty().convention(project.provider { distributionDir.get().file("${baseName.get()}.tar.gz") })
+  val sourceTarballDigest = objectFactory.fileProperty().convention(project.provider { distributionDir.get().file("${baseName.get()}.sha512") })
+
+  val mailingLists = objectFactory.listProperty(String::class.java).convention(emptyList())
+
+  // override the list of developers (P)PMC members + committers, necessary for podlings
+  val podlingPpmcAsfIds = objectFactory.setProperty(String::class.java).convention(emptySet())
+  val podlingCommitterAsfIds = objectFactory.setProperty(String::class.java).convention(emptySet())
+
+  fun distributionFile(ext: String): File =
+    distributionDir.get().file("${baseName.get()}.$ext").asFile
+}