[PATCH v3 1/2] ref-manual/system-requirements.rst: make python3-websockets a default host requirement

[Antonin Godard <antonin.godard@bootlin.com>]

When configuring the project through bitbake-setup we can choose the
"poky-with-sstate" configuration, which requires the python3-websockets
package.

Add this package as a host requirement (under different names depending
on the distro).

Alma, CentOS, and Rocky have a requirement on the buildtools tarball,
which already contains this package, so we don't need to add it for
them.

On Ubuntu 22.04 and Debian 11, the version of python3-websockets
provided by the distribution is too old compared to what we need [1].
Add a separate set of instructions for these.

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
---
 documentation/ref-manual/system-requirements.rst   | 31 ++++++++++++++++++++++
 .../host_packages_scripts/fedora_essential.sh      |  2 +-
 .../opensuse_essential_16.0.sh                     |  2 +-
 3 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/documentation/ref-manual/system-requirements.rst b/documentation/ref-manual/system-requirements.rst
index 298832dd9..dba11a135 100644
--- a/documentation/ref-manual/system-requirements.rst
+++ b/documentation/ref-manual/system-requirements.rst
@@ -166,6 +166,37 @@ Ubuntu and Debian
 
 .. include:: ubuntu-debian-host-packages-nodocs.rst
 
+Additionally, on distributions other than Debian 11 and Ubuntu 22.04 (otherwise
+see note below), install the following package:
+
+.. code-block:: console
+
+   $ sudo apt-get install python3-websockets
+
+.. note::
+
+   On Debian 11 and Ubuntu 22.04, the minimum version for
+   ``python3-websockets`` is not satisfied by the host distribution. This
+   package is used for fetching pre-built :ref:`shared state
+   <overview-manual/concepts:shared state>` artifacts from upstream Yocto Project
+   servers (see :ref:`ref-fragments-core-yocto-sstate-mirror-cdn` for more
+   information).
+
+   In order to use this feature, you can get the correct version of
+   ``python3-websockets`` by either:
+
+   -  Using a :term:`buildtools` tarball by following the
+      :ref:`system-requirements-buildtools` section below.
+
+   -  Installing ``python3-websockets`` using `Pip
+      <https://pip.pypa.io/en/stable/>`__ in a virtual environment, e.g.:
+
+      .. code-block:: console
+
+         $ python3 -m venv --clear ./yocto-docs-venv
+         $ . ./yocto-docs-venv/bin/activate
+         $ pip install websockets
+
 Here are the packages needed to build Project documentation manuals:
 
 .. literalinclude:: ../tools/host_packages_scripts/ubuntu_docs.sh
diff --git a/documentation/tools/host_packages_scripts/fedora_essential.sh b/documentation/tools/host_packages_scripts/fedora_essential.sh
index 99e5d2c0b..55b8b704b 100644
--- a/documentation/tools/host_packages_scripts/fedora_essential.sh
+++ b/documentation/tools/host_packages_scripts/fedora_essential.sh
@@ -1 +1 @@
-sudo dnf install bzip2 ccache chrpath cpio cpp diffstat diffutils file findutils gawk gcc gcc-c++ git glibc-devel glibc-langpack-en gzip hostname libacl make patch perl perl-Data-Dumper perl-File-Compare perl-File-Copy perl-FindBin perl-Text-ParseWords perl-Thread-Queue perl-bignum perl-locale python python3 python3-GitPython python3-jinja2 python3-pexpect python3-pip rpcgen socat tar texinfo unzip wget which xz zstd $([ $(rpm -E %fedora) -ge 42 ] && echo "util-linux-script")
+sudo dnf install bzip2 ccache chrpath cpio cpp diffstat diffutils file findutils gawk gcc gcc-c++ git glibc-devel glibc-langpack-en gzip hostname libacl make patch perl perl-Data-Dumper perl-File-Compare perl-File-Copy perl-FindBin perl-Text-ParseWords perl-Thread-Queue perl-bignum perl-locale python python3 python3-GitPython python3-jinja2 python3-pexpect python3-pip python3-websockets rpcgen socat tar texinfo unzip wget which xz zstd $([ $(rpm -E %fedora) -ge 42 ] && echo "util-linux-script")
diff --git a/documentation/tools/host_packages_scripts/opensuse_essential_16.0.sh b/documentation/tools/host_packages_scripts/opensuse_essential_16.0.sh
index e557ae4fb..f3ee6ad54 100644
--- a/documentation/tools/host_packages_scripts/opensuse_essential_16.0.sh
+++ b/documentation/tools/host_packages_scripts/opensuse_essential_16.0.sh
@@ -1 +1 @@
-sudo zypper install bzip2 chrpath diffstat gcc gcc-c++ git gzip hostname libacl1 make makeinfo patch python3 python3-GitPython python3-Jinja2 python3-curses python3-pexpect python3-pip python3-xml rpcgen socat tar wget which xz zstd
+sudo zypper install bzip2 chrpath diffstat gcc gcc-c++ git gzip hostname libacl1 make makeinfo patch python3 python3-GitPython python3-Jinja2 python3-curses python3-pexpect python3-pip python3-websockets python3-xml rpcgen socat tar wget which xz zstd

-- 
2.53.0