Add support for configuration cache.

app/build.gradle.kts

@@ -1,6 +1,7 @@
+@file:Suppress("UnstableApiUsage")
+
 import com.android.build.api.dsl.ManagedVirtualDevice
 import org.gradle.api.tasks.testing.logging.TestExceptionFormat
-import java.io.ByteArrayOutputStream
 import java.io.FileInputStream
 import java.text.SimpleDateFormat
 import java.util.Date
@@ -634,39 +635,25 @@ fun assertIsGitRepo() {
 fun getLastCommitTimestamp(): String {
   assertIsGitRepo()
 
-  ByteArrayOutputStream().use { os ->
-    exec {
-      executable = "git"
-      args = listOf("log", "-1", "--pretty=format:%ct")
-      standardOutput = os
-    }
-
-    return os.toString() + "000"
-  }
+  return providers.exec {
+    commandLine("git", "log", "-1", "--pretty=format:%ct")
+  }.standardOutput.asText.get() + "000"
 }
 
 fun getGitHash(): String {
   assertIsGitRepo()
 
-  val stdout = ByteArrayOutputStream()
-  exec {
-    commandLine = listOf("git", "rev-parse", "HEAD")
-    standardOutput = stdout
-  }
-
-  return stdout.toString().trim().substring(0, 12)
+  return providers.exec {
+    commandLine("git", "rev-parse", "HEAD")
+  }.standardOutput.asText.get().trim().substring(0, 12)
 }
 
 fun getCurrentGitTag(): String? {
   assertIsGitRepo()
 
-  val stdout = ByteArrayOutputStream()
-  exec {
-    commandLine = listOf("git", "tag", "--points-at", "HEAD")
-    standardOutput = stdout
-  }
-
-  val output: String = stdout.toString().trim()
+  val output = providers.exec {
+    commandLine("git", "tag", "--points-at", "HEAD")
+  }.standardOutput.asText.get().trim()
 
   return if (output.isNotEmpty()) {
     val tags = output.split("\n").toList()
@@ -686,19 +673,10 @@ tasks.withType<Test>().configureEach {
   }
 }
 
-project.tasks.configureEach {
-  if (name.lowercase().contains("nightly") && name != "checkNightlyParams") {
-    dependsOn(tasks.getByName("checkNightlyParams"))
-  }
-}
-
-tasks.register("checkNightlyParams") {
-  doFirst {
-    if (project.gradle.startParameter.taskNames.any { it.lowercase().contains("nightly") }) {
-
-      if (!file("${project.rootDir}/nightly-url.txt").exists()) {
-        throw GradleException("Cannot find 'nightly-url.txt' for nightly build! It must exist in the root of this project and contain the location of the nightly manifest.")
-      }
+gradle.taskGraph.whenReady {
+  if (gradle.startParameter.taskNames.any { it.contains("nightly", ignoreCase = true) }) {
+    if (!file("nightly-url.txt").exists()) {
+      throw GradleException("Missing required file: nightly-url.txt")
     }
   }
 }

build.gradle.kts

@@ -112,6 +112,7 @@ tasks.register("format") {
 }
 
 tasks.register("checkStopship") {
+  val cachedProjectDir = projectDir
   doLast {
     val excludedFiles = listOf(
       "build.gradle.kts",
@@ -125,11 +126,11 @@ tasks.register("checkStopship") {
 
     val allowedExtensions = setOf("kt", "kts", "java", "xml")
 
-    val allFiles = projectDir.walkTopDown()
+    val allFiles = cachedProjectDir.walkTopDown()
       .asSequence()
       .filter { it.isFile && it.extension in allowedExtensions }
       .filterNot {
-        val path = it.relativeTo(projectDir).path
+        val path = it.relativeTo(cachedProjectDir).path
         excludedFiles.contains(path) || excludedDirectories.any { d -> path.startsWith(d) }
       }
       .toList()
@@ -143,7 +144,7 @@ tasks.register("checkStopship") {
       allFiles.map { file ->
         scope.async {
           if (file.readText().contains("STOPSHIP")) {
-            stopshipFiles += file.relativeTo(projectDir).path
+            stopshipFiles += file.relativeTo(cachedProjectDir).path
           }
         }
       }

gradle.properties

@@ -1,6 +1,7 @@
 org.gradle.jvmargs=-Xmx12g -Xms256m -XX:MaxMetaspaceSize=1g
 android.useAndroidX=true
 android.experimental.androidTest.numManagedDeviceShards=4
+org.gradle.configuration-cache=true
 # We never want to use auto-provisioning, as it breaks reproducible builds.
 # This should not be a problem, because we never configure a "javaRepositories"
 # item to tell Gradle where to auto-provision the toolchain from, but adding