Guix: how to set package udev rules

Dec 13, 2021

Just read a thread on guix mailing list, about adding udev rules for a package. in order to have an fixed reference about it, I decided to post it here.

adding udev rules for a guix package is as easy as adding it to the <out>/lib/udev/rules.d/ directory. so we can either add it as an INSTALL rule in our CMakefile.txt or add it to manually install the rules as part of our package install phase:

(define-public package-name
  (package
   ...
   (arguments
    `(#:phases
      (modify-phases %standard-phases
       (add-after 'unpack 'patch-udev-rules
         (lambda* (#:key outputs #:allow-other-keys)
           (let ((out (assoc-ref outputs "out")))
             (substitute* "CMakefile.txt"
                          (("/ib/udev/rules.d")
                           (string-append out "/lib/udev/rules.d")))
             #t))))))
   ...))

(define-public package-name
  (package
   ...
   (arguments
    `(#:phases
      (modify-phases %standard-phases
       (add-after 'install 'install-udev-rules
         (lambda* (#:key outputs #:allow-other-keys)
           (let ((out (assoc-ref outputs "out")))
             (mkdir-p (string-append out "/lib/udev/rules.d"))
             (copy-file "123-my-custom-udev.rules"
                        (string-append out
                                       "/lib/udev/rules.d/"
                                       "123-my-custom-udev.rules"))
             #t))))))
   ...
   ))