Build a single APK for all ABIs

app/build.gradle.kts

@@ -1,4 +1,3 @@
-import com.android.build.gradle.internal.api.ApkVariantOutputImpl
 import org.apache.tools.ant.filters.FixCrLfFilter
 import java.io.PrintStream
 
@@ -42,13 +41,6 @@ android {
         }
     }
 
-    splits {
-        abi {
-            isEnable = true
-            isUniversalApk = true
-        }
-    }
-
     buildFeatures {
         dataBinding = true
     }
@@ -81,40 +73,24 @@ val syncLibs by tasks.registering(Sync::class) {
             include("busybox", "magiskboot", "magiskinit", "magisk")
             rename { if (it == "magisk") "libmagisk32.so" else "lib$it.so" }
         }
-        from(rootProject.file("native/out/arm64-v8a")) {
-            include("magisk")
-            rename { if (it == "magisk") "libmagisk64.so" else "lib$it.so" }
-        }
     }
     into("x86") {
         from(rootProject.file("native/out/x86")) {
             include("busybox", "magiskboot", "magiskinit", "magisk")
             rename { if (it == "magisk") "libmagisk32.so" else "lib$it.so" }
         }
-        from(rootProject.file("native/out/x86_64")) {
-            include("magisk")
-            rename { if (it == "magisk") "libmagisk64.so" else "lib$it.so" }
-        }
     }
     into("arm64-v8a") {
         from(rootProject.file("native/out/arm64-v8a")) {
             include("busybox", "magiskboot", "magiskinit", "magisk")
             rename { if (it == "magisk") "libmagisk64.so" else "lib$it.so" }
         }
-        from(rootProject.file("native/out/armeabi-v7a")) {
-            include("magisk")
-            rename { if (it == "magisk") "libmagisk32.so" else "lib$it.so" }
-        }
     }
     into("x86_64") {
         from(rootProject.file("native/out/x86_64")) {
             include("busybox", "magiskboot", "magiskinit", "magisk")
             rename { if (it == "magisk") "libmagisk64.so" else "lib$it.so" }
         }
-        from(rootProject.file("native/out/x86")) {
-            include("magisk")
-            rename { if (it == "magisk") "libmagisk32.so" else "lib$it.so" }
-        }
     }
     onlyIf {
         if (inputs.sourceFiles.files.size != 16)
@@ -139,10 +115,9 @@ val syncAssets by tasks.registering(Sync::class) {
     }
     filesMatching("**/util_functions.sh") {
         filter {
-            it.replace(
-                "#MAGISK_VERSION_STUB",
+            it.replace("#MAGISK_VERSION_STUB",
                 "MAGISK_VER='${Config.version}'\n" +
-                        "MAGISK_VER_CODE=${Config.versionCode}"
+                "MAGISK_VER_CODE=${Config.versionCode}"
             )
         }
         filter<FixCrLfFilter>("eol" to FixCrLfFilter.CrLf.newInstance("lf"))
@@ -196,13 +171,6 @@ android.applicationVariants.all {
         }
     }
     registerJavaGeneratingTask(genSrcTask.get(), outSrcDir)
-
-    outputs.all {
-        val output = this as ApkVariantOutputImpl
-        output.filters.forEach {
-            output.versionNameOverride += "-${it.identifier}"
-        }
-    }
 }
 
 dependencies {

app/src/main/AndroidManifest.xml

@@ -9,6 +9,7 @@
         android:name=".core.App"
         android:extractNativeLibs="true"
         android:icon="@drawable/ic_launcher"
+        android:multiArch="true"
         tools:ignore="UnusedAttribute,GoogleAppIndexingWarning">
 
         <!-- Splash -->

app/src/main/java/com/topjohnwu/magisk/core/Const.kt

@@ -7,8 +7,12 @@ import com.topjohnwu.magisk.BuildConfig
 @Suppress("DEPRECATION")
 object Const {
 
-    val CPU_ABI: String = Build.SUPPORTED_ABIS[0]
-    val CPU_ABI_32: String = Build.SUPPORTED_32_BIT_ABIS.firstOrNull() ?: CPU_ABI
+    val CPU_ABI: String get() = Build.SUPPORTED_ABIS[0]
+
+    // Null if 32-bit only or 64-bit only
+    val CPU_ABI_32 =
+        if (Build.SUPPORTED_64_BIT_ABIS.isEmpty()) null
+        else Build.SUPPORTED_32_BIT_ABIS.firstOrNull()
 
     // Paths
     lateinit var MAGISKTMP: String

app/src/main/java/com/topjohnwu/magisk/core/Info.kt

@@ -17,7 +17,6 @@ val isRunningAsStub get() = Info.stub != null
 object Info {
 
     var stub: DynAPK.Data? = null
-    var stubArch = "lib/${Const.CPU_ABI}"
 
     val EMPTY_REMOTE = UpdateInfo()
     var remote = EMPTY_REMOTE

app/src/main/java/com/topjohnwu/magisk/core/tasks/MagiskInstaller.kt

@@ -37,6 +37,7 @@ import java.io.*
 import java.nio.ByteBuffer
 import java.security.SecureRandom
 import java.util.*
+import java.util.zip.ZipEntry
 import java.util.zip.ZipFile
 
 abstract class MagiskInstallImpl protected constructor(
@@ -93,8 +94,14 @@ abstract class MagiskInstallImpl protected constructor(
             // Extract binaries
             if (isRunningAsStub) {
                 val zf = ZipFile(DynAPK.current(context))
+
+                // Also extract magisk32 on non 64-bit only 64-bit devices
+                val is32lib = Const.CPU_ABI_32?.let {
+                    { entry: ZipEntry -> entry.name == "lib/$it/libmagisk32.so" }
+                } ?: { false }
+
                 zf.entries().asSequence().filter {
-                    !it.isDirectory && it.name.startsWith(Info.stubArch)
+                    !it.isDirectory && (it.name.startsWith("lib/${Const.CPU_ABI}/") || is32lib(it))
                 }.forEach {
                     val n = it.name.substring(it.name.lastIndexOf('/') + 1)
                     val name = n.substring(3, n.length - 3)
@@ -102,9 +109,17 @@ abstract class MagiskInstallImpl protected constructor(
                     zf.getInputStream(it).writeTo(dest)
                 }
             } else {
-                val libs = File(context.applicationInfo.nativeLibraryDir).listFiles { _, name ->
+                val info = context.applicationInfo
+                var libs = File(info.nativeLibraryDir).listFiles { _, name ->
                     name.startsWith("lib") && name.endsWith(".so")
                 } ?: emptyArray()
+
+                // Also symlink magisk32 on non 64-bit only 64-bit devices
+                val lib32 = info.javaClass.getDeclaredField("secondaryNativeLibraryDir").get(info) as String?
+                if (lib32 != null) {
+                    libs += File(lib32, "libmagisk32.so")
+                }
+
                 for (lib in libs) {
                     val name = lib.name.substring(3, lib.name.length - 3)
                     Os.symlink(lib.path, "$installDir/$name")

app/src/main/java/com/topjohnwu/magisk/core/utils/ShellInit.kt

@@ -33,11 +33,7 @@ class BusyBoxInit : BaseShellInit() {
                 if (!shell.isRoot)
                     return true
                 val jar = JarFile(DynAPK.current(context))
-                var bb = jar.getJarEntry("${Info.stubArch}/libbusybox.so")
-                if (bb == null) {
-                    Info.stubArch = "lib/${Const.CPU_ABI_32}"
-                    bb = jar.getJarEntry("${Info.stubArch}/libbusybox.so")
-                }
+                val bb = jar.getJarEntry("lib/${Const.CPU_ABI}/libbusybox.so")
                 localBB = context.deviceProtectedContext.cachedFile("busybox")
                 localBB.delete()
                 jar.getInputStream(bb).writeTo(localBB)