From 714feeb9a79e29fb4d8fa3626e539a2d758c66b6 Mon Sep 17 00:00:00 2001
From: topjohnwu <topjohnwu@gmail.com>
Date: Tue, 7 Sep 2021 04:02:29 -0700
Subject: [PATCH] Support building on case insensitive filesystems

Fix #4643, close #4641
---
 buildSrc/src/main/java/Codegen.kt             | 20 ++++++++++++-------
 .../topjohnwu/magisk/DownloadActivity.java    |  8 ++++----
 2 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/buildSrc/src/main/java/Codegen.kt b/buildSrc/src/main/java/Codegen.kt
index d56043acf..b8df250c0 100644
--- a/buildSrc/src/main/java/Codegen.kt
+++ b/buildSrc/src/main/java/Codegen.kt
@@ -10,10 +10,12 @@ import javax.crypto.Cipher
 import javax.crypto.CipherOutputStream
 import javax.crypto.spec.IvParameterSpec
 import javax.crypto.spec.SecretKeySpec
+import kotlin.random.asKotlinRandom
 
-// Set non-zero value here to fix the random seed to create reproducible builds
+// Set non-zero value here to fix the random seed for reproducible builds
 const val RAND_SEED = 0
 private lateinit var RANDOM: Random
+private val kRANDOM get() = RANDOM.asKotlinRandom()
 
 private val c1 = mutableListOf<String>()
 private val c2 = mutableListOf<String>()
@@ -195,15 +197,19 @@ fun genStubManifest(srcDir: File, outDir: File): String {
     names.addAll(c3.subList(0, 10))
     names.shuffle(RANDOM)
 
+    // Decapitalize as older Android versions do not allow capitalized package names
+    // Distinct by lower case to support case insensitive file systems
+    val pkgNames = names.map { it.decapitalize(Locale.ROOT) }
+        .distinctBy { it.toLowerCase(Locale.ROOT) }
+
     var idx = 0
-    fun genCmpName(): String {
-        val name = "${names[idx++]}.${names[idx++]}"
-        return name[0].toLowerCase() + name.substring(1)
-    }
+    fun genCmpName() = "${pkgNames[idx++]}.${names.random(kRANDOM)}"
 
     fun genClass(clzName: String, type: String) {
         val (pkg, name) = clzName.split('.')
-        PrintStream(File(mainPkgDir, "$name.java")).use {
+        val pkgDir = File(outDir, pkg)
+        pkgDir.mkdir()
+        PrintStream(File(pkgDir, "$name.java")).use {
             it.println("package $pkg;")
             it.println("public class $name extends com.topjohnwu.magisk.$type {}")
         }
@@ -254,7 +260,7 @@ fun genEncryptedResources(res: File, outDir: File) {
         it.delete()
         txt
     }
-    File(mainPkgDir, "A.java").writeText(r.replace("class R", "class A"))
+    File(mainPkgDir, "R2.java").writeText(r.replace("class R", "class R2"))
 
     // Generate iv and key
     val iv = ByteArray(16)
diff --git a/stub/src/main/java/com/topjohnwu/magisk/DownloadActivity.java b/stub/src/main/java/com/topjohnwu/magisk/DownloadActivity.java
index 7206b9cee..444edb03f 100644
--- a/stub/src/main/java/com/topjohnwu/magisk/DownloadActivity.java
+++ b/stub/src/main/java/com/topjohnwu/magisk/DownloadActivity.java
@@ -4,10 +4,10 @@ import static android.R.string.no;
 import static android.R.string.ok;
 import static android.R.string.yes;
 import static com.topjohnwu.magisk.DelegateApplication.dynLoad;
-import static com.topjohnwu.magisk.A.string.dling;
-import static com.topjohnwu.magisk.A.string.no_internet_msg;
-import static com.topjohnwu.magisk.A.string.relaunch_app;
-import static com.topjohnwu.magisk.A.string.upgrade_msg;
+import static com.topjohnwu.magisk.R2.string.dling;
+import static com.topjohnwu.magisk.R2.string.no_internet_msg;
+import static com.topjohnwu.magisk.R2.string.relaunch_app;
+import static com.topjohnwu.magisk.R2.string.upgrade_msg;
 
 import android.app.Activity;
 import android.app.AlertDialog;