PTU5KAS/docs/userguide.rst

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User Guide
==========
Dependencies & installation
---------------------------
This projects depends on
- Python 3
- distro Python 3 package
- PyYAML Python 3 package (optional, for yaml file support)
If you need Python 2 support consider sending patches. The most
obvious place to start is to use the trollius package intead of
asyncio.
To install kas into your python site-package repository, run::
$ sudo pip3 install .
Usage
-----
There are three options for using kas:
- Install it locally via pip to get the ``kas`` command.
- Use the docker image. In this case run the commands in the examples
below within ``docker run -it <kas-image> sh`` or bind-mount the project into
the container.
- Use the **run-kas** wrapper from this directory. In this case replace ``kas``
in the examples below with ``path/to/run-kas``.
Start build::
$ kas build /path/to/kas-project.yml
Alternatively, experienced bitbake users can invoke usual **bitbake** steps
manually, e.g.::
$ kas shell /path/to/kas-project.yml -c 'bitbake dosfsutils-native'
kas will place downloads and build artifacts under the current directory when
being invoked. You can specify a different location via the environment
variable `KAS_WORK_DIR`.
Command line usage
~~~~~~~~~~~~~~~~~~
.. argparse::
:module: kas.kas
:func: kas_get_argparser
:prog: kas
Environment variables
~~~~~~~~~~~~~~~~~~~~~
============================================= ================================
Environment variable name Description
============================================= ================================
``KAS_WORK_DIR`` The path of the kas work
directory, current work
directory is the default.
``KAS_REPO_REF_DIR`` The path to the repository
reference directory.
Repositories in this directory
are used as references when
cloning. In order for kas to
find those repositories, they
have to be named correctly.
Those names are derived from the
repo url in the kas config.
(E.g. url:
"https://github.com/siemens/meta-iot2000.git"
resolves to the name
"github.com.siemens.meta-iot2000.git")
``KAS_DISTRO`` ``KAS_MACHINE`` ``KAS_TARGET`` This overwrites the respective
setting in the configuration
file.
``SSH_PRIVATE_KEY`` Path to the private key file,
that should be added to an
internal ssh-agent. This key
cannot be password protected.
This setting is useful for
CI building server. On desktop
machines, a ssh-agent running
outside the kas environment is
more useful.
``DL_DIR`` ``SSTATE_DIR`` ``TMPDIR`` Environment variables that are
transfered to the bitbake
environment.
``http_proxy`` ``https_proxy`` ``no_proxy`` This overwrites the proxy
configuration in the
configuration file.
``SSH_AGENT_PID`` SSH agent process id. Used for
cloning over SSH.
``SSH_AUTH_SOCK`` SSH authenication socket. Used
for cloning over SSH.
``SHELL`` The shell to start when using
the `shell` plugin.
``TERM`` The terminal options used in the
`shell` plugin.
============================================= ================================
Use Cases
---------
1. Initial build/setup::
$ mkdir $PROJECT_DIR
$ cd $PROJECT_DIR
$ git clone $PROJECT_URL meta-project
$ kas build meta-project/kas-project.yml
2. Update/rebuild::
$ cd $PROJECT_DIR/meta-project
$ git pull
$ kas build kas-project.yml
Project Configuration
---------------------
Two types of configuration file formats are supported.
For most purposes the static configuration should be used.
In case this static configuration file does not provide enough options for
customization, the dynamic configuration file format can be used.
Static project configuration
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Currently JSON and YAML is supported as the base file format. Since YAML is
arguable easier to read, this documentation focuses on the YAML format.
.. code-block:: yaml
# Every file needs to contain a header, that provides kas with information
# about the context of this file.
header:
# The `version` entry in the header describes for which kas version this
# file was created. It is used by kas to figure out if it is compatible
# with this file. Every version x.y.z should be compatible with
# the configuration file version x.y. (x, y and z are numbers)
version: "x.y"
# The machine as it is written into the `local.conf` of bitbake.
machine: qemu
# The distro name as it is written into the `local.conf` of bitbake.
distro: poky
repos:
# This entry includes the repository where the config file is located
# to the bblayers.conf:
meta-custom:
# Here we include a list of layers from the poky repository to the
# bblayers.conf:
poky:
url: "https://git.yoctoproject.org/git/poky"
refspec: 89e6c98d92887913cadf06b2adb97f26cde4849b
layers:
meta:
meta-poky:
meta-yocto-bsp:
A minimal input file consist out of the ``header``, ``machine``, ``distro``,
and ``repos``.
Additionally, you can add ``bblayers_conf_header`` and ``local_conf_header``
which are strings that are added to the head of the respective files
(``bblayers.conf`` or ``local.conf``):
.. code-block:: yaml
bblayers_conf_header:
meta-custom: |
POKY_BBLAYERS_CONF_VERSION = "2"
BBPATH = "${TOPDIR}"
BBFILES ?= ""
local_conf_header:
meta-custom: |
PATCHRESOLVE = "noop"
CONF_VERSION = "1"
IMAGE_FSTYPES = "tar"
``meta-custom`` in these examples should be a unique name (in project scope)
for this configuration entries. We assume that your configuration file is part
of a ``meta-custom`` repository/layer. This way its possible to overwrite or
append entries in files that include this configuration by naming an entry the
same (overwriting) or using a unused name (appending).
Including in-tree configuration files
.....................................
Its currently possible to include kas configuration files from the same
repository/layer like this:
.. code-block:: yaml
header:
version: "x.y"
includes:
- base.yml
- bsp.yml
- product.yml
The specified files are addressed relative to your current configuration file.
Including configuration files from other repos
..............................................
Its also possible to include configuration files from other repos like this:
.. code-block:: yaml
header:
version: "x.y"
includes:
- repo: poky
file: kas-poky.yml
- repo: meta-bsp-collection
file: hw1/kas-hw-bsp1.yml
- repo: meta-custom
file: products/product.yml
repos:
meta-custom:
meta-bsp-collection:
url: "https://www.example.com/git/meta-bsp-collection"
refspec: 3f786850e387550fdab836ed7e6dc881de23001b
layers:
# Additional to the layers that are added from this repository
# in the hw1/kas-hw-bsp1.yml, we add here an additional bsp
# meta layer:
meta-custom-bsp:
poky:
url: "https://git.yoctoproject.org/git/poky"
refspec: 89e6c98d92887913cadf06b2adb97f26cde4849b
layers:
# If `kas-poky.yml` adds the `meta-yocto-bsp` layer and we
# do not want it in our bblayers for this project, we can
# overwrite it by setting:
meta-yocto-bsp: exclude
The files are addressed relative to the git repository path.
The include mechanism collects and merges the content from top to buttom and
depth first. That means that settings in one include file are overwritten
by settings in a latter include file and entries from the last include file can
be overwritten by the current file. While merging all the dictionaries are
merged recursive while preserving the order in which the entries are added to
the dictionary. This means that ``local_conf_header`` entries are added to the
``local.conf`` file in the same order in which they are defined in the
different include files. Note that the order of the configuration file entries
is not preserved within one include file, because the parser creates normal
unordered dictionaries.
Static configuration reference
..............................
* ``header``: dict [required]
The header of every kas configuration file. It contains information about
context of the file.
* ``version``: string [required]
Lets kas check if it is compatible with this file.
* ``includes``: list [optional]
A list of configuration files this current file is based on. They are
merged in order they are stated. So a latter one could overwrite
settings from previous files. The current file can overwrite settings
from every included file. An item in this list can have one of two types:
* item: string
The path to a kas configuration file, relative to the current file.
* item: dict
If files from other repositories should be included, choose this
representation.
* ``repo``: string [required]
The id of the repository where the file is located. The repo
needs to be defined in the ``repos`` dictionary as ``<repo-id>``.
* ``file``: string [required]
The path to the file relative to the root of the repository.
* ``machine``: string [optional]
Contains the value of the ``MACHINE`` variable that is written into the
``local.conf``. Can be overwritten by the ``KAS_MACHINE`` environment
variable and defaults to ``qemu``.
* ``distro``: string [optional]
Contains the value of the ``DISTRO`` variable that is written into the
``local.conf``. Can be overwritten by the ``KAS_DISTRO`` environment
variable and defaults to ``poky``.
* ``target``: string [optional]
Contains the target to build by bitbake. Can be overwritten by the
``KAS_TARGET`` environment variable and defaults to ``core-image-minimal``.
* ``repos``: dict [optional]
Contains the definitions of all available repos and layers.
* ``<repo-id>``: dict [optional]
Contains the definition of a repository and the layers, that should be
part of the build. If the value is ``None``, the repository, where the
current configuration file is located is defined as ``<repo-id>`` and
added as a layer to the build.
* ``name``: string [optional]
Defines under which name the repository is stored. If its missing
the ``<repo-id>`` will be used.
* ``url``: string [optional]
The url of the git repository. If this is missing, no git operations
are performed.
* ``refspec``: string [optional]
The refspec that should be used. Required if an ``url`` was specified.
* ``path``: string [optional]
The path where the repository is stored.
If the ``url`` and ``path`` is missing, the repository where the
current configuration file is located is defined.
If the ``url`` is missing and the path defined, this entry references
the directory the path points to.
If the ``url`` as well as the ``path`` is defined, the path is used to
overwrite the checkout directory, that defaults to ``kas_work_dir``
+ ``repo.name``.
* ``layers``: dict [optional]
Contains the layers from this repository that should be added to the
``bblayers.conf``. If this is missing or ``None`` or and empty
dictionary, the path to the repo itself is added as a layer.
* ``<layer-path>``: enum [optional]
Adds the layer with ``<layer-path>`` that is relative to the
repository root directory, to the ``bblayers.conf`` if the value of
this entry is not in this list: ``['disabled', 'excluded', 'n', 'no',
'0', 'false']``. This way it is possible to overwrite the inclusion
of a layer in latter loaded configuration files.
* ``bblayers_conf_header``: dict [optional]
This contains strings that should be added to the ``bblayers.conf`` before
any layers are included.
* ``<bblayers-conf-id>``: string [optional]
A string that is added to the ``bblayers.conf``. The entry id
(``<bblayers-conf-id>``) should be unique if lines should be added and
can be the same from another included file, if this entry should be
overwritten. The lines are added to ``bblayers.conf`` in the same order
as they are included from the different configuration files.
* ``local_conf_header``: dict [optional]
This contains strings that should be added to the ``local.conf``.
* ``<local-conf-id>``: string [optional]
A string that is added to the ``local.conf``. It operates in the same way
as the ``bblayers_conf_header`` entry.
* ``proxy_config``: dict [optional]
Defines the proxy configuration bitbake should use. Every entry can be
overwritten by the respective environment variables.
* ``http_proxy``: string [optional]
* ``https_proxy``: string [optional]
* ``no_proxy``: string [optional]
Dynamic project configuration
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The dynamic project configuration is plain Python with following
mandatory functions which need to be provided:
.. code-block:: python
def get_machine(config):
return 'qemu'
def get_distro(config):
return 'poky'
def get_repos(target):
repos = []
repos.append(Repo(
url='URL',
refspec='REFSPEC'))
repos.append(Repo(
url='https://git.yoctoproject.org/git/poky',
refspec='krogoth',
layers=['meta', 'meta-poky', 'meta-yocto-bsp'])))
return repos
Additionally, ``get_bblayers_conf_header()``, ``get_local_conf_header()`` can
be added.
.. code-block:: python
def get_bblayers_conf_header():
return """POKY_BBLAYERS_CONF_VERSION = "2"
BBPATH = "${TOPDIR}"
BBFILES ?= ""
"""
def get_local_conf_header():
return """PATCHRESOLVE = "noop"
CONF_VERSION = "1"
IMAGE_FSTYPES = "tar"
"""
Furthermore, you can add pre and post hooks (``*_prepend``, ``*_append``) for
the exection steps in kas core, e.g.
.. code-block:: python
def build_prepend(config):
# disable distro check
with open(config.build_dir + '/conf/sanity.conf', 'w') as f:
f.write('\n')
def build_append(config):
if 'CI' in os.environ:
build_native_package(config)
run_wic(config)
TODO: Document the complete configuration API.