support arm macos

gradle-plugin-utils/src/main/kotlin/build/extensions/oss/gradle/pluginutils/SystemUtils.kt

@@ -1,18 +1,29 @@
 package build.extensions.oss.gradle.pluginutils
 
-
+/**
+ * The code is used in Gradle Helm Plugin - to put proper classifier and archive format depending on operating system.
+ *
+ * Suffixes below are very common for binary distribution, so they work for other packages as well.
+ */
 object SystemUtils {
 
     private val osName = System.getProperty("os.name")
     private val osArch = System.getProperty("os.arch")
 
-
+    /**
+     * Returns operating system classifier for Helm package.
+     */
+    // Suppress the error - it is easier to list all options in a one place.
+    @Suppress("complexity:CyclomaticComplexMethod")
     fun getOperatingSystemClassifier() =
         when {
             osName.startsWith("Windows") ->
                 "windows-amd64"
             osName.startsWith("Mac OS X") ->
-                "darwin-amd64"
+                when (osArch) {
+                    "aarch64" -> "darwin-arm64"
+                    else -> "darwin-amd64"
+                }
             osName.startsWith("Linux") ->
                 when (osArch) {
                     "amd64" -> "linux-amd64"

gradle-plugin-utils/src/test/kotlin/build/extensions/oss/gradle/pluginutils/SystemUtilsTest.kt

@@ -0,0 +1,50 @@
+package build.extensions.oss.gradle.pluginutils
+
+import io.kotest.matchers.should
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.string.startWith
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.condition.EnabledOnOs
+import org.junit.jupiter.api.condition.OS
+
+/**
+ * Test if we return more or less adequate values. Basically, we can't verify that without running integration tests,
+ * therefore let's check that at least some values are more or less good here.
+ *
+ * We can't check (for example) it easily on ARM on GitHub.
+ *
+ * We run the same test on different operating systems,
+ * so we will never run all methods from this class at the same test run.
+ */
+class SystemUtilsTest {
+
+    @Test
+    @EnabledOnOs(OS.WINDOWS)
+    fun testWindowsClassifier() {
+        SystemUtils.getOperatingSystemClassifier() shouldBe "windows-amd64"
+    }
+
+    @Test
+    @EnabledOnOs(OS.LINUX)
+    fun testLinuxClassifier() {
+        SystemUtils.getOperatingSystemClassifier() should startWith("linux-")
+    }
+
+    @Test
+    @EnabledOnOs(OS.MAC)
+    fun testMacClassifier() {
+        SystemUtils.getOperatingSystemClassifier() should startWith("darwin-")
+    }
+
+    @Test
+    @EnabledOnOs(OS.WINDOWS)
+    fun testWindowsArchiveFormat() {
+        SystemUtils.getOperatingSystemArchiveFormat() shouldBe "zip"
+    }
+
+    @Test
+    @EnabledOnOs(OS.LINUX, OS.MAC)
+    fun testPosixArchiveFormat() {
+        SystemUtils.getOperatingSystemArchiveFormat() shouldBe "tar.gz"
+    }
+}