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= Installing and Configuring b4
:page-parent: Tutorials
// SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is>
// SPDX-License-Identifier: GFDL-1.3-no-invariants-or-later OR CC-BY-SA-4.0
https://git.kernel.org/pub/scm/utils/b4/b4.git/about/[b4] is a utility
for working with patches sent to a mailing list, such as
https://spectrum-os.org/participating.html#spectrum-devel[devel@spectrum-os.org].
== Installing b4
You should be able to install b4 from your package manager.
Using Nix, you can start a shell with b4 available by running
[listing]
[source,shell]
nix-shell -p b4
== Configuring b4
As b4 was originally written for Linux development, it will default to
searching for patches on the Linux mailing lists. So to use it for
Spectrum, it needs to be configured to search the Spectrum mailing
lists instead.
To do this, in the https://spectrum-os.org/git/spectrum[Spectrum git
repository], run:
[listing]
[source,shell]
git config b4.midmask https://spectrum-os.org/lists/archives/spectrum-devel/%s
From now on, any b4 command run in the Spectrum git repository will
search the Spectrum devel mailing list.
== Using b4
Using b4 to fetch and apply a patch from the Spectrum mailing list is
described in the xref:testing-patches.adoc[Testing Patches] how-to guide.
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