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Benedikt Niedermayr c38517df83 add conditional environment variables 
Until now all environment variables in the kas config's
env section require a default value.
In some cases we want to rely on the weak assignment
of bitbake instead of relying on the default value of the
variable in the kas config.

This means if we assign the 'None' value or nothing to the variable
in the kas config then it is only added to BB_ENV_EXTRAWHITE or
BB_ENV_PASSTHROUGH_ADDITIONS without setting it as environment
variable.

Signed-off-by: Benedikt Niedermayr <benedikt.niedermayr@siemens.com>
[Jan: fixed overlong line]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
2022-11-10 19:03:48 +01:00
.github Dockerfile: Rework generation of kas images 2022-08-26 14:34:37 +02:00
contrib Dockerfile: Carry oe-git-proxy locally 2021-08-30 21:56:04 +02:00
docs add conditional environment variables 2022-11-10 19:03:48 +01:00
image-tests image-tests: Update to recent Yocto and Isar revisions 2022-08-26 15:12:20 +02:00
kas add conditional environment variables 2022-11-10 19:03:48 +01:00
scripts scripts: Switch release script to twine 2022-08-05 13:39:35 +02:00
tests tests: Fix style warnings around assert usage 2022-08-04 19:09:12 +02:00
.dockerignore .dockerignore: Update 2022-08-26 14:39:41 +02:00
.flake8 flake8: Ignore obsolete warning W503 2020-11-13 20:54:20 +01:00
.gitignore Add release artifact to .gitignore 2020-11-20 12:05:51 +01:00
.readthedocs.yaml readthedocs: Add configuration file 2021-11-22 19:20:14 +01:00
CHANGELOG.md Release 3.1 2022-08-05 13:17:58 +02:00
container-entrypoint container-entrypoint: Address shellcheck findings 2022-01-11 15:04:47 +01:00
CONTRIBUTING.md CONTRIBUTING: Drop reference to non-existing maintainer list 2020-12-17 18:13:19 +01:00
Dockerfile Dockerfile: avoid deploy the python pip cache 2022-10-14 11:51:48 +02:00
kas-container forward build-concurrency related env vars 2022-10-19 11:02:17 +02:00
kas-docker rename kas-docker to kas-container, leave symlink in place 2020-09-29 08:30:10 +02:00
LICENSE Correct grammar, spelling and copyright year in files 2018-09-05 12:46:35 +02:00
pyproject.toml Provide a pyproject.toml 2021-11-25 09:14:21 +01:00
README.rst Switch to github workflow 2020-09-24 13:13:12 +02:00
run-kas Correct grammar, spelling and copyright year in files 2018-09-05 12:46:35 +02:00
setup.py setup.py: bundle kas-container script 2022-03-29 09:24:37 +02:00

README.rst 

Setup tool for bitbake based projects
=====================================

+--------------------+
|    Build Status    |
+====================+
| |workflow-master|_ |
+--------------------+
| |workflow-next|_   |
+--------------------+

.. |workflow-master| image:: https://github.com/siemens/kas/workflows/master/badge.svg
.. _workflow-master: https://github.com/siemens/kas/actions?query=workflow%3Amaster
.. |workflow-next| image:: https://github.com/siemens/kas/workflows/next/badge.svg
.. _workflow-next: https://github.com/siemens/kas/actions?query=workflow%3Anext

This tool provides an easy mechanism to setup bitbake based
projects.

The OpenEmbedded tooling support starts at step 2 with bitbake. The
downloading of sources and then configuration has to be done by
hand. Usually, this is explained in a README. Instead kas is using a
project configuration file and does the download and configuration
phase.

Key features provided by the build tool:

- clone and checkout bitbake layers
- create default bitbake settings (machine, arch, ...)
- launch minimal build environment, reducing risk of host contamination
- initiate bitbake build process

See the `kas documentation <https://kas.readthedocs.io>`_ for further details.