1. AC Question's Avatar
    Is it possible to use adb within a chroot / PRroot environment on one Android device to run commands to control another Android device, when both Android devices are connected through a USB On The Go cable?

    In other words:
    Does a chroot / PRoot environment give access to the usb port as host?

    On a non rooted Samsung Galaxy tab 2 7.0" I have the app GNUroot Debian installed. This is a chroot (actually it is called PRoot, see below for a description) Linux distribution - currently Debian 'Jessie' - with a terminal. I have installed the 'android-tools-adb package' from the Debian Jessie repository. Obviously the chroot environment has access to the tablet's network hardware.

    Now I would like to control another device (I have a non rooted Huawei Ascend Y300) from the tablet using adb inside the chroot terminal. I managed to do this through WiFi by first connecting the phone to a pc and run the terminal command 'adb tcpip 5555'. Then, on the tablet in the GNUroot Debian app terminal running the command 'adb connect xxx.xxx.x.x' gives adb control from the tablet over the phone through the local wifi network.

    It would be even better to manage the adb control between two android devices from a chroot / PRoot environment without the pc, for example using an On The Go cable. Assuming non rooted devices. The tablet in question (Samsung Galaxy tab 2 7.0") has usb host capabilities. So in theory it could be done with a usb On The Go cable connecting the two Android devices.

    The reason for this question is the development of an app on my tablet, using the Android IDE app, which must be tested on other (non rooted) Android devices. Preferably from the tablet, preferably without a pc.

    Description of PRoot from 'proot-me' repository at github.com:
    PRoot is a user-space implementation of ``chroot``, ``mount --bind``,
    and ``binfmt_misc``. This means that users don't need any privileges
    or setup to do things like using an arbitrary directory as the new
    root filesystem, making files accessible somewhere else in the
    filesystem hierarchy, or executing programs built for another CPU
    architecture transparently through QEMU user-mode. Also, developers
    can use PRoot as a generic Linux process instrumentation engine thanks
    to its extension mechanism, see CARE_ for an example. Technically
    PRoot relies on ``ptrace``, an unprivileged system-call available in
    every Linux kernel.

    The new root file-system, a.k.a *guest rootfs*, typically contains a
    Linux distribution. By default PRoot confines the execution of
    programs to the guest rootfs only, however users can use the built-in
    *mount/bind* mechanism to access files and directories from the actual
    root file-system, a.k.a *host rootfs*, just as if they were part of
    the guest rootfs.

    When the guest Linux distribution is made for a CPU architecture
    incompatible with the host one, PRoot uses the CPU emulator QEMU
    user-mode to execute transparently guest programs. It's a convenient
    way to develop, to build, and to validate any guest Linux packages
    seamlessly on users' computer, just as if they were in a *native*
    guest environment. That way all of the cross-compilation issues are

    PRoot can also *mix* the execution of host programs and the execution
    of guest programs emulated by QEMU user-mode. This is useful to use
    host equivalents of programs that are missing from the guest rootfs
    and to speed up build-time by using cross-compilation tools or
    CPU-independent programs, like interpreters.

    It is worth noting that the guest kernel is never involved, regardless
    of whether QEMU user-mode is used or not. Technically, when guest
    programs perform access to system resources, PRoot translates their
    requests before sending them to the host kernel. This means that
    guest programs can use host resources (devices, network, ...) just as
    if they were "normal" host programs.
    02-10-2017 06:52 AM

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