Remove more pre SDK 21 stuffs

README.MD

@@ -4,17 +4,17 @@
 
 ## Introduction
 
-Magisk is a suite of open source tools for customizing Android, supporting devices higher than Android 4.2. It covers fundamental parts of Android customization: root, boot scripts, SELinux patches, AVB2.0 / dm-verity / forceencrypt removals etc.
-
+Magisk is a suite of open source software for customizing Android, supporting devices higher than Android 5.0.<br>
 Here are some feature highlights:
 
-- **MagiskSU**: Provide root access to your device
+- **MagiskSU**: Provide root access for applications
 - **Magisk Modules**: Modify read-only partitions by installing modules
 - **MagiskHide**: Hide Magisk from root detections / system integrity checks
+- **MagiskBoot**: The most complete tool for unpacking and repacking Android boot images
 
 ## Downloads
 
-Please note that the only source of official Magisk information and downloads is [Github](https://github.com/topjohnwu/Magisk/). Beware of any other websites.
+[Github](https://github.com/topjohnwu/Magisk/) is the only source where you can get official Magisk information and downloads.
 
 [![](https://img.shields.io/badge/Magisk-v22.1-blue)](https://github.com/topjohnwu/Magisk/releases/tag/v22.1)
 [![](https://img.shields.io/badge/Magisk%20Beta-v22.1-blue)](https://github.com/topjohnwu/Magisk/releases/tag/v22.1)
@@ -27,13 +27,6 @@ Please note that the only source of official Magisk information and downloads is
 - [Magisk Documentation](https://topjohnwu.github.io/Magisk/)
 - [Magisk Troubleshoot Wiki](https://www.didgeridoohan.com/magisk/HomePage) (by [@Didgeridoohan](https://github.com/Didgeridoohan))
 
-## Android Version Support
-
-- Android 4.2+: MagiskSU and Magisk Modules Only
-- Android 4.4+: All core features available
-- Android 6.0+: Guaranteed MagiskHide support
-- Android 7.0+: Full MagiskHide protection
-
 ## Bug Reports
 
 **Only bug reports from Canary builds will be accepted.**

native/jni/core/applets.cpp

@@ -31,7 +31,7 @@ static int call_applet(int argc, char *argv[]) {
 
 int main(int argc, char *argv[]) {
     umask(0);
-    dload_selinux();
+    enable_selinux();
     cmdline_logging();
     init_argv0(argc, argv);
 

native/jni/core/bootstages.cpp

@@ -140,12 +140,6 @@ static bool magisk_env() {
     xmkdir(SECURE_DIR "/post-fs-data.d", 0755);
     xmkdir(SECURE_DIR "/service.d", 0755);
 
-    // Disable/remove magiskhide, resetprop
-    if (SDK_INT < 19) {
-        unlink("/sbin/resetprop");
-        unlink("/sbin/magiskhide");
-    }
-
     if (access(DATABIN "/busybox", X_OK))
         return false;
 

native/jni/magiskhide/hide_utils.cpp

@@ -264,9 +264,6 @@ static void update_hide_config() {
 int launch_magiskhide(bool late_props) {
     mutex_guard lock(hide_state_lock);
 
-    if (SDK_INT < 19)
-        return DAEMON_ERROR;
-
     if (hide_state)
         return HIDE_IS_ENABLED;
 
@@ -325,7 +322,7 @@ void auto_start_magiskhide(bool late_props) {
         pthread_kill(monitor_thread, SIGALRM);
 #endif
         hide_late_sensitive_props();
-    } else if (SDK_INT >= 19) {
+    } else {
         db_settings dbs;
         get_db_settings(dbs, HIDE_CONFIG);
         if (dbs[HIDE_CONFIG])

native/jni/utils/include/selinux.hpp

@@ -36,7 +36,6 @@ extern int (*fsetfilecon)(int fd, const char *con);
 void getfilecon_at(int dirfd, const char *name, char **con);
 void setfilecon_at(int dirfd, const char *name, const char *con);
 
-void selinux_builtin_impl();
-void dload_selinux();
+void enable_selinux();
 void restorecon();
 void restore_tmpcon();

native/jni/utils/selinux.cpp

@@ -99,7 +99,7 @@ void setfilecon_at(int dirfd, const char *name, const char *con) {
     lsetfilecon(path, con);
 }
 
-void selinux_builtin_impl() {
+void enable_selinux() {
     setcon = __setcon;
     getfilecon = __getfilecon;
     lgetfilecon = __lgetfilecon;
@@ -108,13 +108,3 @@ void selinux_builtin_impl() {
     lsetfilecon = __lsetfilecon;
     fsetfilecon = __fsetfilecon;
 }
-
-void dload_selinux() {
-    if (access("/system/lib/libselinux.so", F_OK) && access("/system/lib64/libselinux.so", F_OK))
-        return;
-    /* We only check whether libselinux.so exists but don't dlopen.
-     * For some reason calling symbols returned from dlsym
-     * will result to SEGV_ACCERR on some devices.
-     * Always use builtin implementations for SELinux stuffs. */
-    selinux_builtin_impl();
-}

scripts/emulator.sh

@@ -11,7 +11,7 @@
 # in the emulator. The constructed Magisk environment is not a
 # fully functional one as if it is running on an actual device.
 #
-# The script assumes you are using x86/x64 emulator images.
+# The script assumes you are using x64 emulator images.
 # Build binaries with `./build.py binary` before running this script.
 #
 #####################################################################
@@ -29,14 +29,8 @@ mount_sbin() {
 if [ ! -f /system/build.prop ]; then
   # Running on PC
   cd "$(dirname "$0")/.."
-  tmp="/data/local/tmp"
-  adb push native/out/x86/busybox native/out/x86/magiskinit scripts/emulator.sh $tmp
-  emu_arch=$(adb shell "chmod 777 $tmp/busybox; $tmp/busybox uname -m")
-  if [ "$emu_arch" = "x86_64" ]; then
-    adb push native/out/x86_64/magisk /data/local/tmp
-  else
-    adb push native/out/x86/magisk /data/local/tmp
-  fi
+  adb push native/out/x86/busybox native/out/x86/magiskinit \
+  native/out/x86_64/magisk scripts/emulator.sh /data/local/tmp
   adb shell sh /data/local/tmp/emulator.sh
   exit 0
 fi
@@ -89,7 +83,7 @@ elif [ -e /sbin ]; then
   mount_sbin
   if ! grep -q '/sbin/.magisk/mirror/system_root' /proc/mounts; then
     mkdir -p /sbin/.magisk/mirror/system_root
-    block=`mount | grep ' / ' | awk '{ print $1 }'`
+    block=$(mount | grep ' / ' | awk '{ print $1 }')
     [ $block = "/dev/root" ] && block=/dev/block/dm-0
     mount -o ro $block /sbin/.magisk/mirror/system_root
   fi
@@ -98,7 +92,7 @@ elif [ -e /sbin ]; then
     if [ -L $file ]; then
       cp -af $file /sbin
     else
-      sfile=/sbin/`basename $file`
+      sfile=/sbin/$(basename $file)
       touch $sfile
       mount -o bind $file $sfile
     fi

scripts/flash_script.sh

@@ -48,7 +48,7 @@ ui_print "- Target image: $BOOTIMAGE"
 # Detect version and architecture
 api_level_arch_detect
 
-[ $API -lt 17 ] && abort "! Magisk only support Android 4.2 and above"
+[ $API -lt 21 ] && abort "! Magisk only support Android 5.0 and above"
 
 ui_print "- Device platform: $ARCH"
 

scripts/util_functions.sh

@@ -448,7 +448,7 @@ flash_image() {
 install_magisk() {
   cd $MAGISKBIN
 
-  if [ $API -ge 21 -a ! -c $BOOTIMAGE ]; then
+  if [ ! -c $BOOTIMAGE ]; then
     eval $BOOTSIGNER -verify < $BOOTIMAGE && BOOTSIGNED=true
     $BOOTSIGNED && ui_print "- Boot image is signed with AVB 1.0"
   fi