Metadata-Version: 2.1
Name: depthcharge-tools
Version: 0.5.0
Summary: Tools to manage the Chrome OS bootloader
Home-page: https://github.com/alpernebbi/depthcharge-tools
Author: Alper Nebi Yasak
Author-email: alpernebiyasak@gmail.com
License: GPL2+
Keywords: ChromeOS ChromiumOS depthcharge vboot vbutil_kernel
Platform: UNKNOWN
Classifier: Development Status :: 3 - Alpha
Classifier: Environment :: Console
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)
Classifier: Operating System :: POSIX :: Linux
Classifier: Programming Language :: Python :: 3
Classifier: Topic :: System :: Boot
Description-Content-Type: text/x-rst

=================
Depthcharge-Tools
=================
This project is a collection of tools that ease and automate interacting
with depthcharge_, the Chrome OS bootloader.

Depthcharge is built into the firmware of Chrome OS boards, uses a
custom verified boot flow and usually cannot boot other operating
systems as is. This means someone who wants to use e.g. Debian_ on these
boards need to either replace the firmware or work their system into
`the format depthcharge expects`_. These tools are about the latter.

Right now these are developed on and tested with only one arm64 board,
but everything will attempt to work on other boards based on my best
guesses. Support for `x86 boards`_ is very limited at a fundamental
level due to a lack of understanding on my part.

.. _depthcharge: https://chromium.googlesource.com/chromiumos/platform/depthcharge
.. _the format depthcharge expects: https://www.chromium.org/chromium-os/chromiumos-design-docs/disk-format#TOC-Google-Chrome-OS-devices
.. _Debian: https://www.debian.org/


mkdepthcharge
=============
The mkdepthcharge_ tool is intended to wrap mkimage_ and vbutil_kernel_
to provide reasonable defaults to them, hide their idiosyncrasies and
automate creating a depthcharge-bootable partition image appropriate for
the running architecture. An example invocation on a Samsung Chromebook
Plus (v1, arm64) could be::

    $ mkdepthcharge -o depthcharge.img --compress lzma \
        --cmdline "console=tty1 root=/dev/mmcblk0p2 rootwait" \
        /boot/vmlinuz.gz /boot/initrd.img rk3399-gru-kevin.dtb

Here, mkdepthcharge would automatically extract and recompress the
kernel, create a FIT image, put command line parameters into a file,
create an empty bootloader, and provide defaults for vboot keys and
other arguments while building the partition image.

.. _mkdepthcharge: https://github.com/alpernebbi/depthcharge-tools/blob/master/mkdepthcharge.rst
.. _mkimage: https://dyn.manpages.debian.org/jump?q=unstable/mkimage
.. _vbutil_kernel: https://dyn.manpages.debian.org/jump?q=unstable/vbutil_kernel


depthchargectl
==============
The depthchargectl_ tool goes a step further and aims to fully automate
bootable image creation and Chrome OS kernel partition management, even
the board-specific and distro-specific parts. With proper integration
with your distribution, depthchargectl can keep your system bootable
across kernel and initramfs changes without any interaction on your
part. Even without such integration, a single command automates most of
the work::

    # Use --allow-current if you only have one Chrome OS kernel partition.
    $ sudo depthchargectl write --allow-current
    Building depthcharge image for board 'Samsung Chromebook Plus' ('kevin').
    Built depthcharge image for kernel version '5.10.0-6-arm64'.
    Wrote image '/boot/depthcharge/5.10.0-6-arm64.img' to partition '/dev/mmcblk1p1'.
    Set partition '/dev/mmcblk1p1' as next to boot.

    # After a reboot, you or an init service should run this.
    $ sudo depthchargectl bless
    Set partition '/dev/mmcblk1p1' as successfully booted.

.. _depthchargectl: https://github.com/alpernebbi/depthcharge-tools/blob/master/depthchargectl.rst


Installation
============
These tools depend on ``mkimage``, ``vbutil_kernel``, ``cgpt``, and
other utilities (``util-linux``, ``coreutils``, etc.) that are usually
installed by default on most Linux systems, so you need to install those
first. You also need ``docutils`` to build the manual pages with
``rst2man``, but only for that.

This project (or at least ``depthchargectl``) is meant to be integrated
into your operating system by its maintainers, and the best way to
install it is through your OS' package manager whenever possible.


Configuration
=============
You can configure depthcharge-tools with the |CONFIG_FILE| file, or by
putting similar fragments in the |CONFIGD_DIR| directory. See the
config.ini_ file for the built-in default configuration.

Settings in the ``[depthcharge-tools]`` section are the global defaults
from which all commands inherit. Other than that, config sections have
inheritence based on their names i.e. those in the form of ``[a/b/c]``
inherit from ``[a/b]`` which also inherits from ``[a]``. Each subcommand
reads its config from such a subsection.

Currently the following configuration options are available::

    [depthcharge-tools]
    enable-system-hooks: Write/remove images on kernel/initramfs changes
    vboot-keyblock: The kernel keyblock file for verifying and signing images
    vboot-private-key: The private key (.vbprivk) for signing images
    vboot-public-key: The public key for (.vbpubk) verifying images

    [depthchargectl]
    board: Codename of a board to build and check images for
    ignore-initramfs: Do not include an initramfs in the image
    images-dir: Directory to store built images
    kernel-cmdline: Kernel commandline parameters to use

For longer explanations check the manual pages of each command for
options named the same as these.

.. |CONFIG_FILE| replace:: ``/etc/depthcharge-tools/config``
.. |CONFIGD_DIR| replace:: ``/etc/depthcharge-tools/config.d``
.. _config.ini: https://github.com/alpernebbi/depthcharge-tools/blob/master/depthcharge_tools/config.ini


Installation for development
============================
If you want to use development versions, you can clone this repository
and install using pip::

    $ pip3 install --user -e /path/to/depthcharge-tools

Hopefully, you should be able to use depthchargectl with just that::

    $ depthchargectl build --output depthcharge.img
    Building depthcharge image for board 'Samsung Chromebook Plus' ('kevin').
    Built depthcharge image for kernel version '5.10.0-6-arm64'.
    depthchargectl.img

Most ``depthchargectl`` functionality needs root as it handles disks and
partitions, and you need special care while invoking as root::

    $ depthchargectl() {
        sudo PYTHONPATH=/path/to/depthcharge-tools \
            python3 -m depthcharge_tools.depthchargectl "$@"
    }

    $ depthchargectl list /dev/mmcblk0
    S  P  T  PATH
    1  2  0  /dev/mmcblk0p2
    1  1  0  /dev/mmcblk0p4
    0  0  15 /dev/mmcblk0p6


Contributing
============
I only own one chromebook, so I need your help to make it work with all
others. Pull requests, bug reports, or even pointers in the right
direction for existing issues are all welcome. Currently I need the most
help with `x86 boards`_.

.. _x86 boards: https://github.com/alpernebbi/depthcharge-tools/issues/2


License
=======
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>


