Re: [Buildroot] [PATCH 2/2] docs/manual: add integration section for systemd with dbus

["Yann E. MORIN" <yann.morin.1998@free.fr>]

Arnout, All,

On 2022-07-28 00:12 +0200, Arnout Vandecappelle (Essensium/Mind) spake thusly:
> Add a section to the "Integration topics" chapter about how we integrate
> systemd. Add a first subsection about how dbus and dbus-broker work with
> systemd.
> 
> This is just the start of the integration information about systemd.

Thanks!

> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

Applied to master, thanks.

Regards,
Yann E. MORIN.

> ---
>  docs/manual/integration-systemd.txt | 27 +++++++++++++++++++++++++++
>  docs/manual/integration.txt         |  2 ++
>  2 files changed, 29 insertions(+)
>  create mode 100644 docs/manual/integration-systemd.txt
> 
> diff --git a/docs/manual/integration-systemd.txt b/docs/manual/integration-systemd.txt
> new file mode 100644
> index 0000000000..44248b43ff
> --- /dev/null
> +++ b/docs/manual/integration-systemd.txt
> @@ -0,0 +1,27 @@
> +// -*- mode:doc; -*-
> +// vim: set syntax=asciidoc:
> +
> +[[integration-systemd]]
> +=== Systemd
> +
> +This chapter describes the decisions taken in Buildroot's integration of
> +systemd, and how various use cases can be implemented.
> +
> +==== DBus daemon
> +
> +Systemd requires a DBus daemon. There are two options for it: traditional dbus
> +(+BR2_PACKAGE_DBUS+) and bus1 dbus-broker (+BR2_PACKAGE_DBUS_BROKER+). At
> +least one of them must be chosen. If both are included in the configuration,
> +dbus-broker will be used as system bus, but the traditional dbus-daemon is
> +still installed as well and can be used as session bus. Also its tools (e.g.
> ++dbus-send+) can be used (systemd itself has +busctl+ as an alternative). In
> +addition, the traditional dbus package is the only one that provides +libdbus+,
> +which is used by many packages as dbus integration library.
> +
> +Both in the dbus and in the dbus-broker case, the daemon runs as user +dbus+.
> +The DBus configuration files are also identical for both.
> +
> +To make sure that only one of the two daemons is started as system bus, the
> +systemd activation files of the dbus package (+dbus.socket+ and the
> ++dbus.service+ symlink in +multi-user.target.wants+) are removed when
> +dbus-broker is selected.
> diff --git a/docs/manual/integration.txt b/docs/manual/integration.txt
> index bdfbfa59de..be56bf6567 100644
> --- a/docs/manual/integration.txt
> +++ b/docs/manual/integration.txt
> @@ -9,4 +9,6 @@ level. Buildroot is highly configurable, almost everything discussed
>  here can be changed or overridden by xref:rootfs-custom[rootfs overlay
>  or custom skeleton] configuration.
>  
> +include::integration-systemd.txt[]
> +
>  include::integration-selinux-support.txt[]
> -- 
> 2.35.3
> 

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