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Android: include su binary executable in AOSP assembly

I'm trying to get the su binar included in /out/.../system/xbin/su after you've built Android from source. I have su binary (from Chainfire) as executable, but I cannot include it in the AOSP build.

All examples or solutions I came across have been discussed in Android_Source_Root:

  • Removing the su directory from system/extras/

    and including the su-binary directory (taken from ChainsDD) in external /.
  • Change the file system/extras/su/Android.mk

    to "LOCAL_MODULE_TAGS: = optional" and the file build/target/product/core.mk

    to include su in PRODUCT_PACKAGES.

All of them have su.c, su.h and other files in the su directory which are used to build the su package.

I would like to know how to include su in an AOSP build when I have a "su executable", only without having to include su.c or any of those files? Where should I put the su directory and what is the content of the Android.mk file?

I ask for advice and thanks for your time.

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1 answer


I managed to solve the problem I was talking about. Below are two ways to solve the problem, but I ran into another problem described in the heading "A problem occurred".

* Note: I put the su binary in prebuilts / su

Solution 1

I changed the device.mk file in the directory device/

. I added the following to the file.

PRODUCT_COPY_FILES += \
    prebuilts/su/su:system/xbin

Solution 2

I changed the device.mk file in the directory device/

. I added the following to the file.

PRODUCT_PACKAGES += \
    su

Then I added and paste the following into the file Android.mk

in prebuilts/su/su

.

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional
LOCAL_MODULE := su
LOCAL_SRC_FILES := $(LOCAL_MODULE)
LOCAL_MODULE_CLASS := EXECUTABLES

LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
LOCAL_UNSTRIPPED_PATH := $(LOCAL_MODULE_PATH)

include $(BUILD_PREBUILT)

The problem arose



I cannot chmod su the binary after it has been copied to the directory system/xbin

. I have tried several ways as follows, but no result.

  • I added the following after the lines in Solution 1 and it keeps giving me an error chmod ... file cannot be found

    .

        $(shell chmod 6755 out/<product>/system/xbin/su)

  • I added the following to Solution 2 Android.mk file before the line include $(BUILD_PREBUILT)

    , but none of them changed the file permissions.

    #Trial 1.
SU_BINARY := $(LOCAL_MODULE_PATH)/su
$(SU_BINARY)-post: su
    $(shell chmod 6755 $(LOCAL_MODULE_PATH)/su)

#Trial 2 without "-post".
SU_BINARY := $(LOCAL_MODULE_PATH)/su
$(SU_BINARY): su
    $(shell chmod 6755 $(LOCAL_MODULE_PATH)/su)

#Trial 3.
SU_BINARY := $(LOCAL_MODULE_PATH)/su
$(SU_BINARY): su
    chmod 6755 $(LOCAL_MODULE_PATH)/su

Can anyone consult the chmod

file for advice ? Thank you for your time.

Problems solved

Solution 1 (for issue 1)

First change the resolution of the file chmod 6755 prebuilts/su/su

. Include the following in the device.mk file in the directory device/

.

PRODUCT_COPY_FILES += \
    prebuilts/su/su:system/xbin

Solution 2 (for issue 2)

Just add the following to your Android.mk file before include $(BUILD_PREBUILT) 

LOCAL_POST_INSTALL_CMD := chmod 6755 $(LOCAL_MODULE_PATH)/$(LOCAL_MODULE)
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