Establish native Linux ARM64 Android CI and verification gates (#94)

android/rust-bridge/src/androidTest/kotlin/de/rfc1437/ironstorage/bridge/NativeLoadPerformanceTest.kt

@@ -0,0 +1,26 @@
+package de.rfc1437.ironstorage.bridge
+
+import android.os.Bundle
+import android.os.SystemClock
+import androidx.test.platform.app.InstrumentationRegistry
+import de.rfc1437.ironstorage.bridge.generated.MobileShellState
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class NativeLoadPerformanceTest {
+    @Test
+    fun reportsNativeLoadAndFirstRustFixtureWithoutSecretData() {
+        val instrumentation = InstrumentationRegistry.getInstrumentation()
+        val runtime = NativeRuntime(instrumentation.targetContext)
+        val started = SystemClock.elapsedRealtimeNanos()
+        val shell = runtime.fixture(MobileShellState.EMPTY)
+        val elapsed = SystemClock.elapsedRealtimeNanos() - started
+        assertTrue(elapsed > 0)
+        assertEquals(5, shell.pages.size)
+        instrumentation.sendStatus(
+            0,
+            Bundle().apply { putLong("ironstorage_native_load_ns", elapsed) }
+        )
+    }
+}

android/rust-bridge/src/androidTest/kotlin/de/rfc1437/ironstorage/bridge/NativeRuntimeTest.kt

@@ -14,6 +14,7 @@ import de.rfc1437.ironstorage.bridge.generated.MobileTab
 import de.rfc1437.ironstorage.bridge.generated.UniffiRustCallStatus
 import de.rfc1437.ironstorage.bridge.generated.uniffiTraitInterfaceCall
 import java.io.File
+import java.util.zip.ZipEntry
 import java.util.zip.ZipOutputStream
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
@@ -102,12 +103,17 @@ class NativeRuntimeTest {
     @Test
     fun missingLibraryAndUnsupportedAbiFailBeforeEnteringRust() {
         val abiFailure = assertThrows(NativeBridgeException::class.java) {
-            NativeRuntime.supportedAbi(listOf("unsupported-fixture-abi"))
+            NativeRuntime.supportedAbi(listOf("x86_64", "unsupported-fixture-abi"))
         }
         assertEquals(NativeFailureKind.UnsupportedAbi, abiFailure.kind)
+        assertEquals("arm64-v8a", NativeRuntime.supportedAbi(listOf("x86_64", "arm64-v8a")))
         val packageFile = File.createTempFile("native-empty-package", ".apk", context.cacheDir)
         try {
-            ZipOutputStream(packageFile.outputStream()).close()
+            ZipOutputStream(packageFile.outputStream()).use { archive ->
+                // API 26 rejects a ZIP with no entries; keep this valid package free of native code.
+                archive.putNextEntry(ZipEntry("non-native-fixture"))
+                archive.closeEntry()
+            }
             val info = ApplicationInfo(context.applicationInfo).apply {
                 sourceDir = packageFile.absolutePath
                 splitSourceDirs = null

android/rust-bridge/src/main/kotlin/de/rfc1437/ironstorage/bridge/NativeRuntime.kt

@@ -85,7 +85,7 @@ class NativeRuntime(context: Context) {
         private const val LIBRARY_FILE = "libironstorage_android.so"
 
         internal fun supportedAbi(deviceAbis: List<String>): String =
-            deviceAbis.firstOrNull { it in setOf("arm64-v8a", "armeabi-v7a", "x86_64") }
+            deviceAbis.firstOrNull { it in setOf("arm64-v8a", "armeabi-v7a") }
                 ?: throw NativeBridgeException(NativeFailureKind.UnsupportedAbi)
     }
 }