[Gradle, Cocoapods] Add Podfile missing info to podInstall error report

#KT-42243 Fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/cocoapods/CocoapodsExtension.kt

@@ -91,7 +91,7 @@ open class CocoapodsExtension(private val project: Project) {
 
     // For some reason Gradle doesn't consume the @Nested annotation on NamedDomainObjectContainer.
     @get:Nested
-    protected val podsAsTaskInput: List<CocoapodsDependency>
+    val podsAsTaskInput: List<CocoapodsDependency>
         get() = _pods.toList()
 
     /**
@@ -273,7 +273,7 @@ open class CocoapodsExtension(private val project: Project) {
 
     class SpecRepos {
         @get:Internal
-        internal val specRepos = mutableSetOf<URI>()
+        internal val specRepos = mutableSetOf(URI("https://cdn.cocoapods.org"))
 
         fun url(url: String) {
             specRepos.add(URI(url))

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/cocoapods/KotlinCocoapodsPlugin.kt

@@ -89,7 +89,6 @@ private val CocoapodsDependency.toPodDownloadTaskName: String
     )
 
 open class KotlinCocoapodsPlugin : Plugin<Project> {
-
     private fun KotlinMultiplatformExtension.supportedTargets() = targets
         .withType(KotlinNativeTarget::class.java)
         .matching { it.konanTarget.family.isAppleFamily }
@@ -354,6 +353,7 @@ open class KotlinCocoapodsPlugin : Plugin<Project> {
             it.group = TASK_GROUP
             it.description = "Invokes `pod install` call within Podfile location directory"
             it.podfile.set(cocoapodsExtension.podfile)
+            it.frameworkName = project.provider { cocoapodsExtension.frameworkName }
             it.onlyIf { isAvailableToProduceSynthetic }
 
             //TODO avoid subproject task management here

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/cocoapods/missingPodfileInfoUtils.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.targets.native.cocoapods
+
+import org.gradle.api.Project
+import org.jetbrains.kotlin.gradle.plugin.cocoapods.CocoapodsExtension.CocoapodsDependency
+import org.jetbrains.kotlin.gradle.plugin.cocoapods.CocoapodsExtension.SpecRepos
+
+interface MissingInfoMessage<T> {
+    val missingInfo: T
+    val missingMessage: String
+}
+
+class MissingSpecReposMessage(override val missingInfo: SpecRepos) : MissingInfoMessage<SpecRepos> {
+    override val missingMessage: String
+        get() = missingInfo.getAll().joinToString(separator = "\n") { "source '$it'" }
+}
+
+class MissingCocoapodsMessage(override val missingInfo: CocoapodsDependency, private val project: Project) :
+    MissingInfoMessage<CocoapodsDependency> {
+    override val missingMessage: String
+        get() = "pod '${missingInfo.name}'${missingInfo.source?.let { ", :path => '${it.getLocalPath(project, missingInfo.name)}'" } ?: ""}"
+}
+

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/tasks/AdvancedCocoapodsTasks.kt

@@ -16,6 +16,10 @@ import org.gradle.api.tasks.Optional
 import org.jetbrains.kotlin.gradle.plugin.cocoapods.CocoapodsExtension.*
 import org.jetbrains.kotlin.gradle.plugin.cocoapods.CocoapodsExtension.CocoapodsDependency.PodLocation.*
 import org.jetbrains.kotlin.gradle.plugin.cocoapods.cocoapodsBuildDirs
+import org.jetbrains.kotlin.gradle.targets.native.cocoapods.MissingCocoapodsMessage
+import org.jetbrains.kotlin.gradle.targets.native.cocoapods.MissingSpecReposMessage
+import org.jetbrains.kotlin.gradle.tasks.PodspecTask.Companion.retrievePods
+import org.jetbrains.kotlin.gradle.tasks.PodspecTask.Companion.retrieveSpecRepos
 import org.jetbrains.kotlin.konan.target.Family
 import java.io.File
 import java.io.FileInputStream
@@ -46,6 +50,9 @@ open class PodInstallTask : DefaultTask() {
         onlyIf { podfile.isPresent }
     }
 
+    @get:Internal
+    internal lateinit var frameworkName: Provider<String>
+
     @get:Optional
     @get:Input
     internal val podfile = project.objects.property(File::class.java)
@@ -68,10 +75,28 @@ open class PodInstallTask : DefaultTask() {
             val podInstallOutput = podInstallProcess.inputStream.use { it.reader().readText() }
 
             check(podInstallRetCode == 0) {
-                listOf(
+                val specReposMessages = retrieveSpecRepos(project)?.let { MissingSpecReposMessage(it).missingMessage }
+                val cocoapodsMessages = retrievePods(project)?.map { MissingCocoapodsMessage(it, project).missingMessage }
+
+                listOfNotNull(
                     "Executing of 'pod install' failed with code $podInstallRetCode.",
                     "Error message:",
-                    podInstallOutput
+                    podInstallOutput,
+                    specReposMessages?.let {
+                        """
+                            |Please, check that file "${podfile.get().path}" contains following lines in header:
+                            |$it
+                            |
+                        """.trimMargin()
+                    },
+                    cocoapodsMessages?.let {
+                        """
+                            |Please, check that each target depended on ${frameworkName.get()} contains following dependencies:
+                            |${it.joinToString("\n")}
+                            |
+                        """.trimMargin()
+                    }
+
                 ).joinToString("\n")
             }
             with(podsXcodeProjDirProvider) {
@@ -350,8 +375,7 @@ open class PodGenTask : DefaultTask() {
         val syntheticDir = project.cocoapodsBuildDirs.synthetic(family).apply { mkdirs() }
         val localPodspecPaths = pods.get().mapNotNull { it.source?.getLocalPath(project, it.name) }
 
-        val specRepos = specRepos.get().getAll().toMutableList()
+        val specRepos = specRepos.get().getAll()
-        specRepos += URI("https://cdn.cocoapods.org")
 
         val podGenProcessArgs = listOfNotNull(
             "pod", "gen",

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/tasks/CocoapodsTasks.kt

@@ -189,6 +189,9 @@ open class PodspecTask : DefaultTask() {
             if (project.rootProject == project) project.multiplatformExtensionOrNull?.cocoapodsExtensionOrNull?.podfile != null
             else project.multiplatformExtensionOrNull?.cocoapodsExtensionOrNull?.podfile != null
                     || (project.parent?.let { hasPodfileOwnOrParent(it) } ?: false)
+
+        internal fun retrieveSpecRepos(project: Project): SpecRepos? = project.multiplatformExtensionOrNull?.cocoapodsExtensionOrNull?.specRepos
+        internal fun retrievePods(project: Project): List<CocoapodsDependency>? = project.multiplatformExtensionOrNull?.cocoapodsExtensionOrNull?.podsAsTaskInput
     }
 }