Fix various Gradle warnings

plugins/src/main/java/com/google/firebase/gradle/plugins/BaseFirebaseLibraryPlugin.kt

@@ -290,7 +290,7 @@ fun FirebaseLibraryExtension.resolveProjectLevelDependencies() =
     .allDependencies
     .mapNotNull { it as? ProjectDependency }
     .map {
-      it.dependencyProject.extensions.findByType<FirebaseLibraryExtension>()
+      project.project(it.dependencyProject.path).extensions.findByType<FirebaseLibraryExtension>()
         ?: throw RuntimeException(
           "Project level dependencies must have the firebaseLibrary plugin. The following dependency does not: ${it.artifactName}"
         )

plugins/src/main/java/com/google/firebase/gradle/plugins/Changelog.kt

@@ -366,7 +366,7 @@ data class Change(val type: ChangeType, val message: String) {
     fun fromString(string: String): Change {
       val (type, description) = REGEX.findOrThrow(string).destructured
 
-      return Change(ChangeType.valueOf(type.toUpperCase()), description.trim())
+      return Change(ChangeType.valueOf(type.uppercase()), description.trim())
     }
   }
 }
@@ -384,5 +384,5 @@ enum class ChangeType {
   REMOVED,
   DEPRECATED;
 
-  override fun toString(): String = name.toLowerCase()
+  override fun toString(): String = name.lowercase()
 }

plugins/src/main/java/com/google/firebase/gradle/plugins/GradleExtensions.kt

@@ -47,10 +47,10 @@ import org.gradle.workers.WorkQueue
  *
  * Syntax sugar for:
  * ```
- * project.file("${project.buildDir}/$path)
+ * project.file("${project.layout.buildDirectory.get().asFile}/$path)
  * ```
  */
-fun Project.fileFromBuildDir(path: String) = file("$buildDir/$path")
+fun Project.fileFromBuildDir(path: String) = file("${layout.buildDirectory.get().asFile}/$path")
 
 /**
  * Maps a file provider to another file provider as a sub directory.

plugins/src/main/java/com/google/firebase/gradle/plugins/LibraryGroups.kt

@@ -39,7 +39,7 @@ fun computeLibraryGroups(project: Project): Map<String, List<FirebaseLibraryExte
 }
 
 fun fixLibraryGroupVersions(libraryGroups: Map<String, List<FirebaseLibraryExtension>>) {
-  for ((name, libraryGroup) in libraryGroups) {
+  for ((_, libraryGroup) in libraryGroups) {
     val maxVersion =
       libraryGroup.mapNotNull { it.moduleVersion }.maxOrNull()?.toString() ?: continue
     for (firebaseExtension in libraryGroup) {

plugins/src/main/java/com/google/firebase/gradle/plugins/MakeReleaseNotesTask.kt

@@ -148,7 +148,7 @@ abstract class MakeReleaseNotesTask : DefaultTask() {
         "GitHub [#$id](//github.com/firebase/firebase-android-sdk/issues/$id){: .external}"
       }
 
-    return "* {{${type.name.toLowerCase()}}} $fixedMessage"
+    return "* {{${type.name.lowercase()}}} $fixedMessage"
   }
 
   companion object {

plugins/src/main/java/com/google/firebase/gradle/plugins/Metalava.kt

@@ -19,6 +19,7 @@ package com.google.firebase.gradle.plugins
 import java.io.File
 import java.io.FileOutputStream
 import java.io.OutputStream
+import javax.inject.Inject
 import org.gradle.api.DefaultTask
 import org.gradle.api.Project
 import org.gradle.api.artifacts.Configuration
@@ -33,6 +34,7 @@ import org.gradle.api.tasks.InputFiles
 import org.gradle.api.tasks.OutputDirectory
 import org.gradle.api.tasks.OutputFile
 import org.gradle.api.tasks.TaskAction
+import org.gradle.process.ExecOperations
 
 val Project.metalavaConfig: Configuration
   get() =
@@ -46,9 +48,10 @@ val Project.metalavaConfig: Configuration
       }
 
 val Project.docStubs: File?
-  get() = project.file("${buildDir.path}/doc-stubs")
+  get() = project.file("${project.layout.buildDirectory.get().asFile.path}/doc-stubs")
 
 fun Project.runMetalavaWithArgs(
+  execOperations: ExecOperations,
   arguments: List<String>,
   ignoreFailure: Boolean = false,
   stdOut: OutputStream? = null,
@@ -61,23 +64,25 @@ fun Project.runMetalavaWithArgs(
       "HiddenAbstractMethod",
     ) + arguments
 
-  project.javaexec {
+  execOperations.javaexec {
     mainClass.set("com.android.tools.metalava.Driver")
-    classpath = project.metalavaConfig
+    classpath = metalavaConfig
     args = allArgs
     isIgnoreExitValue = ignoreFailure
     if (stdOut != null) errorOutput = stdOut
   }
 }
 
-abstract class GenerateStubsTask : DefaultTask() {
+abstract class GenerateStubsTask @Inject constructor(private val execOperations: ExecOperations) :
+  DefaultTask() {
   /** Source files against which API signatures will be validated. */
   @get:InputFiles abstract val sources: ConfigurableFileCollection
 
   @get:[InputFiles Classpath]
   lateinit var classPath: FileCollection
 
-  @get:OutputDirectory val outputDir: File = File(project.buildDir, "doc-stubs")
+  @get:OutputDirectory
+  val outputDir: File = File(project.layout.buildDirectory.get().asFile, "doc-stubs")
 
   @TaskAction
   fun run() {
@@ -87,6 +92,7 @@ abstract class GenerateStubsTask : DefaultTask() {
     project.androidJar?.let { classPath += listOf(it.absolutePath) }
 
     project.runMetalavaWithArgs(
+      execOperations,
       listOf(
         "--source-path",
         sourcePath,
@@ -95,12 +101,13 @@ abstract class GenerateStubsTask : DefaultTask() {
         "--include-annotations",
         "--doc-stubs",
         outputDir.absolutePath,
-      )
+      ),
     )
   }
 }
 
-abstract class GenerateApiTxtTask : DefaultTask() {
+abstract class GenerateApiTxtTask @Inject constructor(private val execOperations: ExecOperations) :
+  DefaultTask() {
   /** Source files against which API signatures will be validated. */
   @get:InputFiles abstract val sources: ConfigurableFileCollection
 
@@ -120,6 +127,7 @@ abstract class GenerateApiTxtTask : DefaultTask() {
     project.androidJar?.let { classPath += listOf(it.absolutePath) }
 
     project.runMetalavaWithArgs(
+      execOperations,
       listOf(
         "--source-path",
         sourcePath,
@@ -138,7 +146,8 @@ abstract class GenerateApiTxtTask : DefaultTask() {
   }
 }
 
-abstract class ApiInformationTask : DefaultTask() {
+abstract class ApiInformationTask @Inject constructor(private val execOperations: ExecOperations) :
+  DefaultTask() {
   /** Source files against which API signatures will be validated. */
   @get:InputFiles abstract val sources: ConfigurableFileCollection
 
@@ -162,6 +171,7 @@ abstract class ApiInformationTask : DefaultTask() {
     project.androidJar?.let { classPath += listOf(it.absolutePath) }
 
     project.runMetalavaWithArgs(
+      execOperations,
       listOf(
         "--source-path",
         sourcePath,
@@ -175,6 +185,7 @@ abstract class ApiInformationTask : DefaultTask() {
     )
 
     project.runMetalavaWithArgs(
+      execOperations,
       listOf(
         "--source-files",
         outputApiFile.get().asFile.absolutePath,

plugins/src/main/java/com/google/firebase/gradle/plugins/ProjectExtensions.kt

@@ -31,7 +31,7 @@ fun Project.isAndroid(): Boolean =
   }
 
 fun toBoolean(value: Any?): Boolean {
-  val trimmed = value?.toString()?.trim()?.toLowerCase()
+  val trimmed = value?.toString()?.trim()?.lowercase()
   return "true" == trimmed || "y" == trimmed || "1" == trimmed
 }
 

plugins/src/main/java/com/google/firebase/gradle/plugins/PublishingPlugin.kt

@@ -91,7 +91,7 @@ abstract class PublishingPlugin : Plugin<Project> {
       val generateBom = registerGenerateBomTask(project)
       val generateBomReleaseNotes = registerGenerateBomReleaseNotesTask(project, generateBom)
       val generateTutorialBundle = registerGenerateTutorialBundleTask(project)
-      val validatePomForRelease = registerValidatePomForReleaseTask(project, releasingProjects)
+      registerValidatePomForReleaseTask(project, releasingProjects)
       val checkHeadDependencies =
         registerCheckHeadDependenciesTask(project, releasingFirebaseLibraries)
       val validateProjectsToPublish =

plugins/src/main/java/com/google/firebase/gradle/plugins/SemVerTask.kt

@@ -18,15 +18,18 @@ package com.google.firebase.gradle.plugins
 
 import com.google.firebase.gradle.plugins.semver.VersionDelta
 import java.io.ByteArrayOutputStream
+import javax.inject.Inject
 import org.gradle.api.DefaultTask
 import org.gradle.api.GradleException
 import org.gradle.api.file.RegularFileProperty
 import org.gradle.api.provider.Property
 import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.InputFile
 import org.gradle.api.tasks.TaskAction
+import org.gradle.process.ExecOperations
 
-abstract class SemVerTask : DefaultTask() {
+abstract class SemVerTask @Inject constructor(private val execOperations: ExecOperations) :
+  DefaultTask() {
   @get:InputFile abstract val apiTxtFile: RegularFileProperty
   @get:InputFile abstract val otherApiFile: RegularFileProperty
   @get:Input abstract val currentVersionString: Property<String>
@@ -47,6 +50,7 @@ abstract class SemVerTask : DefaultTask() {
       }
     val stream = ByteArrayOutputStream()
     project.runMetalavaWithArgs(
+      execOperations,
       listOf(
         "--source-files",
         apiTxtFile.get().asFile.absolutePath,
@@ -66,7 +70,6 @@ abstract class SemVerTask : DefaultTask() {
     val minorChanges = mutableListOf<String>()
     val majorChanges = mutableListOf<String>()
     for (match in reg.findAll(string)) {
-      val loc = match.groups[1]!!.value
       val message = match.groups[2]!!.value
       val type = match.groups[3]!!.value
       if (IGNORED.contains(type)) {

plugins/src/main/java/com/google/firebase/gradle/plugins/ci/ChangedModulesTask.kt

@@ -52,7 +52,6 @@ abstract class ChangedModulesTask : DefaultTask() {
       AffectedProjectFinder(project, changedGitPaths.toSet(), listOf())
         .find()
         .filter {
-          val ext = it.extensions.findByType(FirebaseLibraryExtension::class.java)
           !onlyFirebaseSDKs || it.extensions.findByType<FirebaseLibraryExtension>() != null
         }
         .map { it.path }
@@ -62,12 +61,13 @@ abstract class ChangedModulesTask : DefaultTask() {
     project.rootProject.subprojects.forEach { p ->
       p.configurations.forEach { c ->
         c.dependencies.filterIsInstance<ProjectDependency>().forEach {
+          val dependencyProject = project.project(it.dependencyProject.path)
           if (
             !onlyFirebaseSDKs ||
-              it.dependencyProject.extensions.findByType<FirebaseLibraryExtension>() != null
+              dependencyProject.extensions.findByType<FirebaseLibraryExtension>() != null
           ) {
             if (!onlyFirebaseSDKs || p.extensions.findByType<FirebaseLibraryExtension>() != null) {
-              result[it.dependencyProject.path]?.add(p.path)
+              result[dependencyProject.path]?.add(p.path)
             }
           }
         }

plugins/src/main/java/com/google/firebase/gradle/plugins/semver/ApiDiffer.kt

@@ -111,7 +111,7 @@ abstract class ApiDiffer : DefaultTask() {
     val classes: MutableMap<String, ClassNode> = LinkedHashMap()
     val inputStream = Files.newInputStream(jar)
     val jis = JarInputStream(inputStream)
-    var je: JarEntry? = null
+    var je: JarEntry?
     while (true) {
       je = jis.nextJarEntry
       if (je == null) {