Installing and Configuring b4
b4 is a utility for working with patches sent to a mailing list, such as firstname.lastname@example.org.
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You should be able to install b4 from your package manager.
Using Nix, you can start a shell with b4 available by running:
nix-shell -p 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 a checkout of the appropriate git repository (Spectrum or Spectrum Nixpkgs), run:
git config b4.midmask https://spectrum-os.org/lists/archives/spectrum-devel/%s
From now on, any b4 command run in Spectrum repositories will search the Spectrum devel mailing list.
Using b4 to fetch and apply a patch from the Spectrum mailing list is described in the Testing Patches how-to guide.