Conventional update-binary for Android recovery (Eclipse NDK build)---Mainly for CWM/TWRP Recovery

Some people may curious how does update-binary in your update.zip is created...And what is going on inside of it

This show you how to compile it in normal way.

Features

1. Execution speed is faster, binary size is much smaller than AOSP rom generated binary, even without any PE compression.
2. Function is shrinked, but added set file permission.
3. Compatible with most platform, ARM, x86, etc.
4. SELinux is deleted from code.

Usage and common errors

Usage

Create a script file call "updater-script" inside your zip folder, e.g: ZIPFILE/META-INF/com/google/android/, edit your script here.

Put your compiled update-binary into that folder too, pack your zip correctly(7zip deflate) will do the job, finally test your zip installer.

Errors

1. Incompatible binary is used. You may using x86 binary on ARM devices.
2. Check your script, wrong syntax will cause error.

Example "updater-script" from JamesDSPManager .zip installer:

ui_print("**********************************************");
ui_print("*Installing JamesDSP for Android 5.X.X or above (ARM)*");
ui_print("**********************************************");
run_program("/sbin/busybox", "mount", "/system");
delete_recursive("/system/app/MusicFX");
delete_recursive("/system/priv-app/MusicFX");
delete_recursive("/system/priv-app/AudioFX");
delete_recursive("/system/priv-app/SoundAlive_20_L");
delete_recursive("/system/priv-app/SoundAlive_30");
delete_recursive("/data/data/org.cyanogenmod.audiofx");
delete_recursive("/data/data/com.android.musicfx");
delete_recursive("/data/data/com.sec.android.app.soundalive");
delete("/system/app/DSPManager_All.apk");
delete("/system/lib/libjamesDSPImpulseToolbox.so");
delete("/system/lib/soundfx/libjamesdsp.so");
delete("/system/vendor/etc/audio_effects.conf");
package_extract_dir("system", "/system");
ui_print("Fixing permissions...");
set_perm(0, 0, 0644, "/system/app/DSPManager_All.apk");
set_perm(0, 0, 0644, "/system/lib/libjamesDSPImpulseToolbox.so");
set_perm(0, 0, 0644, "/system/lib/soundfx/libjamesdsp.so");
set_perm(0, 0, 0644, "/system/vendor/etc/audio_effects.conf");
run_program("/sbin/busybox", "umount", "/system");
ui_print("**********************************************");
ui_print("* Installation complete...                   *");
ui_print("* Please reboot and launch JamesDSP          *");
ui_print("**********************************************");
show_progress(0.100000, 0);