Enable signing for publication into Gradle plugin portal

^KT-53172 Fixed

buildSrc/src/main/kotlin/GradleCommon.kt

@@ -54,9 +54,11 @@ enum class GradlePluginVariant(
 /**
  * Configures common pom configuration parameters
  */
-fun Project.configureCommonPublicationSettingsForGradle() {
+fun Project.configureCommonPublicationSettingsForGradle(
+    signingRequired: Boolean
+) {
     plugins.withId("maven-publish") {
-        configureDefaultPublishing()
+        configureDefaultPublishing(signingRequired)
 
         extensions.configure<PublishingExtension> {
             publications

buildSrc/src/main/kotlin/gradle-plugin-common-configuration.gradle.kts

@@ -3,6 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 import com.gradle.publish.PluginBundleExtension
+import plugins.signLibraryPublication
 
 plugins {
     kotlin("jvm")
@@ -12,7 +13,11 @@ plugins {
     id("com.gradle.plugin-publish")
 }
 
-configureCommonPublicationSettingsForGradle()
+// Enable signing for publications into Gradle Plugin Portal
+val signPublication = !version.toString().contains("-SNAPSHOT") &&
+        (project.gradle.startParameter.taskNames.contains("publishPlugins") || signLibraryPublication)
+
+configureCommonPublicationSettingsForGradle(signPublication)
 configureKotlinCompileTasksGradleCompatibility()
 extensions.extraProperties["kotlin.stdlib.default.dependency"] = "false"
 

buildSrc/src/main/kotlin/gradle-plugin-dependency-configuration.gradle.kts

@@ -4,6 +4,7 @@
  */
 
 import plugins.KotlinBuildPublishingPlugin.Companion.DEFAULT_MAIN_PUBLICATION_NAME
+import plugins.signLibraryPublication
 
 plugins {
     `java-library`
@@ -12,7 +13,7 @@ plugins {
     `maven-publish`
 }
 
-configureCommonPublicationSettingsForGradle()
+configureCommonPublicationSettingsForGradle(signLibraryPublication)
 configureKotlinCompileTasksGradleCompatibility()
 extensions.extraProperties["kotlin.stdlib.default.dependency"] = "false"
 

buildSrc/src/main/kotlin/plugins/KotlinBuildPublishingPlugin.kt

@@ -129,8 +129,14 @@ fun MavenPublication.configureKotlinPomAttributes(project: Project, explicitDesc
     }
 }
 
+val Project.signLibraryPublication: Boolean
+    get() = project.providers.gradleProperty("signingRequired").forUseAtConfigurationTime().orNull?.toBoolean()
+        ?: project.providers.gradleProperty("isSonatypeRelease").forUseAtConfigurationTime().orNull?.toBoolean()
+        ?: false
 
-fun Project.configureDefaultPublishing() {
+fun Project.configureDefaultPublishing(
+    signingRequired: Boolean = signLibraryPublication
+) {
     configure<PublishingExtension> {
         repositories {
             maven {
@@ -140,9 +146,6 @@ fun Project.configureDefaultPublishing() {
         }
     }
 
-    val signingRequired = project.providers.gradleProperty("signingRequired").forUseAtConfigurationTime().orNull?.toBoolean()
-        ?: project.providers.gradleProperty("isSonatypeRelease").forUseAtConfigurationTime().orNull?.toBoolean() ?: false
-
     if (signingRequired) {
         apply<SigningPlugin>()
         configureSigning()