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Chen Qi 1be02b42d9 dhcpcd: fix to work with systemd

Currently, dhcpcd does not work well with systemd. When using dhcpcd
to configure network, the /etc/resolv.conf contents are not correct.
This issue could easily be reproduced by using 'qemu + slirp' to
start a systemd based image and using dhcpcd to configure network.
The expected 'nameserver 10.0.2.3' is not in /etc/resolv.conf.

The root cause of this problem is that dhcpcd assumes the resolvconf
should recognize .protocol suffix[1]. But systemd's resolvconf (which
is a symlink to resolvectl) has a limited support for traditional
resolvconf interface[2], and "may not work with all clients"[3]. This
of cource includes the clients that use the .protocol suffix.

The current situation is:
1. systemd is not going to support the .protocol suffix in the foreseeable
   near future[4].
2. dhcpcd does not want to merge systemd specific patch and insists
   systemd needs to consider the .protocol suffix[5][6].

It's a normal thing that people have different opinions. As a build system
that supports such combination, however, we do need to come up with a
solution to fix this typical integration problem, making dhcpcd and systemd
work together.

This patch solves this integration problem by relying on dhcpcd's ability
to manage its own resolv.conf contents. But instead of letting it to write
to /etc/resolv.conf directly, we supply the generated contents to resolvconf.
In this way, the resolvconf still stands in the central place and dhcpcd remains
a supplier to it. And the /etc/resolv.conf can get the correct contents.
With this patch, dhcpcd could work with both sysvinit and systemd.

[1] https://man.archlinux.org/man/resolvconf.8.en
[2] https://man.archlinux.org/man/resolvectl.1#COMPATIBILITY_WITH_RESOLVCONF(8)
[3] https://wiki.archlinux.org/title/systemd-resolved
[4] https://github.com/systemd/systemd/issues/25032
[5] https://github.com/NetworkConfiguration/dhcpcd/pull/152
[6] https://github.com/NetworkConfiguration/dhcpcd/issues/146

(From OE-Core rev: 935ae419f51d911c73f5dc7b4a2e5e9a7b206985)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2022-11-22 12:26:45 +00:00

bitbake

bitbake: cache: Drop support for not saving the cache file

2022-11-20 08:31:28 +00:00

contrib

contrib/git-hooks: add a sendemail-validate example hook that adds FROM: lines to outgoing patch emails

2020-12-30 14:01:07 +00:00

documentation

release-notes: use oe_git and yocto_git macros

2022-11-10 22:12:56 +00:00

README.md

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.