/****************************************************************************

 *      can't set android permissions - built without android support

 * 说明：

 *     昨天在使用Ubuntu自带的mkuserimg打包Android ext4镜像时出现这个错误，今天

 * 找一下原因，解决一下。

 *

 *                                          2016-9-10 深圳 南山平山村 曾剑锋

 ***************************************************************************/

一、参考文档：

    . [Bug ] Re: make_ext4fs results in "can't set android permissions - built without android support"

        https://lists.ubuntu.com/archives/foundations-bugs/2014-October/213902.html

二、原因解释如下：

    . When trying to use make_ext4fs command(through the mkuserimg script), it errors out with "can't set android permissions - built without android support", solution was to compile from source and add "-Icore/include -DANDROID" parameter, works fine.

    . 从上可知，是make_ext4fs编译时参数没给对；

    . 从Android源码编译的角度来说是编译成功了，也就是说Ubuntu自带了一个make_ext4fs，但没有添加Android的支持，所以只需要将Android编译出来的bin文件路径添加到PATH最前面就可以解决了。

        export PATH=/home/zengjf/myandroid/out/host/linux-x86/bin:$PATH

三、运行效果如下：

    zengjf@zengjf:~/myandroid$ mkuserimg.sh -s out/target/product/sabresd_6dq/system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img ext4 system  out/target/product/sabresd_6dq/root/file_contexts

    make_ext4fs -s -T - -S out/target/product/sabresd_6dq/root/file_contexts -l  -a system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system

    Creating filesystem with parameters:

        Size:

        Block size:

        Blocks per group:

        Inodes per group:

        Inode size:

        Journal blocks:

        Label:

        Blocks:

        Block groups:

        Reserved block group size:

    Created filesystem with / inodes and / blocks

    zengjf@zengjf:~/myandroid$