[bug#39308] [PATCH] gnu: Install the udev rules for light to its output.

[Amin Bandali]

* gnu/packages/linux.scm (light): Add install-udev-rules phase to copy the
90-backlight.rules file from the root of the repository to the special
lib/udev/rules.d/ directory of the out output.
---
 gnu/packages/linux.scm | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gnu/packages/linux.scm b/gnu/packages/linux.scm
index 9b0dfd8eb7..dfbe2f88bd 100644
--- a/gnu/packages/linux.scm
+++ b/gnu/packages/linux.scm
@@ -5042,6 +5042,15 @@ monitoring tools for Linux.  These include 
@code{mpstat}, @code{iostat},
         (base32 "0zrjipd392bzjvxx0rjrb0cgi0ix1d83fwgw1mcy8kc4d16cgyjg"))
        (file-name (git-file-name name version))))
     (build-system gnu-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'install 'install-udev-rules
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let ((out (assoc-ref outputs "out")))
+               (install-file
+                "90-backlight.rules" (string-append out "/lib/udev/rules.d"))
+               #t))))))
     (native-inputs
      `(("autoconf" ,autoconf)
        ("automake" ,automake)))
-- 
2.25.0