42e8b2682f
For many years OE-Core has injected it's own python modules into the python namespace using an immediate expansion of a variable in base.bbclass. It also added all entries from BBPATH to sys.path. We really need this to become a first class citizen of the langauge, this new addpylib directive allows that. Usage is of the form: addpylib <directory> <namespace> The namespace is imported and if there is an attribute BBIMPORT, that list of names is iterated and imported too. This mirrors what OE-Core has done for a long time with one difference in implmentation, sys.path is only appended to. This means later imported namespaces can't overwrite an earlier one and can't overwrite the main python module space. In practice we've never done that and it isn't something we should encourage or support. The new directive is only applied for .conf files and not other filetypes as it only makes sense in that context. It is also only allowed in the "base configuration" context of cookerdata since adding it at the recipe level wouldn't work properly due to the way it changes the global namespace. At the same time, move the list of modules to place in the global namespace into a BB_GLOBAL_PYMODULES variable. It is intended that only the core layer should touch this and it is meant to be a very small list, usually os and sys. BB_GLOBAL_PYMODULES is expected to be set before the first addpylib directive. Layers adding a lib directory will now need to use this directive as BBPATH is not going to be added automatically by OE-Core in future. The directives are immediate operations so it does make modules available sooner than the current OE-Core approach. The new code appends to sys.path rather than prepends as core did, as overwriting python standard library modules would be a bad idea and naturally encouraging people to collaborate around our own core modules is desireable. (Bitbake rev: afb8478d3853f6edf3669b93588314627d617d6b) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Poky
Poky is an integration of various components to form a pre-packaged build system and development environment which is used as a development and validation tool by the Yocto Project. It features support for building customised embedded style device images and custom containers. There are reference demo images ranging from X11/GTK+ to Weston, commandline and more. The system supports cross-architecture application development using QEMU emulation and a standalone toolchain and SDK suitable for IDE integration.
Additional information on the specifics of hardware that Poky supports is available in README.hardware. Further hardware support can easily be added in the form of BSP layers which extend the systems capabilities in a modular way. Many layers are available and can be found through the layer index.
As an integration layer Poky consists of several upstream projects such as BitBake, OpenEmbedded-Core, Yocto documentation, the 'meta-yocto' layer which has configuration and hardware support components. These components are all part of the Yocto Project and OpenEmbedded ecosystems.
The Yocto Project has extensive documentation about the system including a reference manual which can be found at https://docs.yoctoproject.org/
OpenEmbedded is the build architecture used by Poky and the Yocto project. For information about OpenEmbedded, see the OpenEmbedded website.
Contribution Guidelines
The project works using a mailing list patch submission process. Patches should be sent to the mailing list for the repository the components originate from (see below). Throughout the Yocto Project, the README files in the component in question should detail where to send patches, who the maintainers are and where bugs should be reported.
A guide to submitting patches to OpenEmbedded is available at:
https://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded
There is good documentation on how to write/format patches at:
https://www.openembedded.org/wiki/Commit_Patch_Message_Guidelines
Where to Send Patches
As Poky is an integration repository (built using a tool called combo-layer), patches against the various components should be sent to their respective upstreams:
OpenEmbedded-Core (files in meta/, meta-selftest/, meta-skeleton/, scripts/):
- Git repository: https://git.openembedded.org/openembedded-core/
- Mailing list: openembedded-core@lists.openembedded.org
BitBake (files in bitbake/):
- Git repository: https://git.openembedded.org/bitbake/
- Mailing list: bitbake-devel@lists.openembedded.org
Documentation (files in documentation/):
- Git repository: https://git.yoctoproject.org/cgit/cgit.cgi/yocto-docs/
- Mailing list: docs@lists.yoctoproject.org
meta-yocto (files in meta-poky/, meta-yocto-bsp/):
- Git repository: https://git.yoctoproject.org/cgit/cgit.cgi/meta-yocto
- Mailing list: poky@lists.yoctoproject.org
If in doubt, check the openembedded-core git repository for the content you intend to modify as most files are from there unless clearly one of the above categories. Before sending, be sure the patches apply cleanly to the current git repository branch in question.