build: gradle task for updating submodules with specific commit

CHANGELOG.md

@@ -52,6 +52,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Build, CI
 
+* (build) [\#4](https://github.com/line/finschia-kt/pull/4) Add gradle `updateSubmodule` task and `checkoutSubModule` task to run `git submodule update --init --remote` with specific version before `build task` 
+
 ### Document Updates
 
 <!-- Release links -->

buildSrc/build.gradle.kts

@@ -15,3 +15,13 @@ repositories {
 dependencies {
     implementation("org.jetbrains.kotlin:kotlin-gradle-plugin")
 }
+
+tasks.named("build") {
+    dependsOn("updateSubmodule")
+}
+
+tasks.register("updateSubmodule") {
+    exec {
+        commandLine("git", "submodule", "update", "--init", "--remote")
+    }
+}

protobuf/build.gradle.kts

@@ -52,6 +52,30 @@ tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().all {
     }
 }
 
+tasks.named("build") {
+    dependsOn("checkoutSubModules")
+}
+
+tasks.register("checkoutSubModules") {
+    var subModules = mapOf(
+        // {moduleName} to {version}
+        "lbm-sdk" to "v0.47.0-alpha1",
+        "ibc-go" to "v3.3.2",
+        "wasmd" to "v0.1.0"
+    )
+    for ((name, version) in subModules.entries) {
+        var submoduleProjectDir = "repositories/" + name
+        println("Updating submodule $name to version $version in directory $submoduleProjectDir")
+        var result = exec {
+            workingDir = File(submoduleProjectDir)
+            commandLine("git", "checkout", version)
+        }
+        if (result.exitValue != 0) {
+            throw GradleException("Failed to update submodule $name to version $version")
+        }
+    }
+}
+
 dependencies {
     api(libs.grpc.protobuf)
     api(libs.grpc.kotlin.stub)