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name: gnu/bootloader/extlinux.scm 	 # note: path name is non-authoritative(*)

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 David Craven <david@craven.ch>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu bootloader extlinux)
  #:use-module (gnu bootloader)
  #:use-module (gnu packages base)
  #:use-module (gnu packages bootloaders)
  #:use-module (gnu packages package-management)
  #:use-module (gnu system locale)
  #:use-module (guix gexp)
  #:use-module (guix utils)
  #:use-module (ice-9 match)
  #:export (extlinux-bootloader
            extlinux-bootloader-gpt))

(define* (extlinux-configuration-file config entries
                                      #:key
                                      (locale #f)
                                      (system (%current-system))
                                      (old-entries '())
                                      #:allow-other-keys)
  "Return the U-Boot configuration file corresponding to CONFIG, a
<u-boot-configuration> object, and where the store is available at STORE-FS, a
<file-system> object.  OLD-ENTRIES is taken to be a list of menu entries
corresponding to old generations of the system."

  (define all-entries
    (append entries (bootloader-configuration-menu-entries config)))

  (define (translate-label label)
    (match label
      (('hurd name version)
       ;; TRANSLATORS: The first parameter is the capitalized package name
       ;; for the Hurd kernel, which uses the definite article in English.
       ;; The second parameter contains the version string.
       #~(format #f (G_ "GNU with the ~a ~a") package version))
      (('linux name version)
       ;; TRANSLATORS: The first parameter is the capitalized package name
       ;; for Linux kernel, which doesn't use the definite article in
       ;; English.  The second parameter contains the version string.
       #~(format #f (G_ "GNU with ~a ~a") package version))
      (('unknown)
       ;; TRANSLATORS: This is the label for an unknown system to be booted.
       #~(G_ "GNU"))
      ((? string? old-format)
       ;; We cannot translate properly the old format.
       old-format)))

  (define init-gettext
    #~(let ((locale #$(and locale
                           (locale-definition-name
                            (locale-name->definition locale)))))
        (when locale
          (setenv "GUIX_LOCPATH" (string-append #$glibc-locales
                                                "/lib/locale/"))
          (bindtextdomain "guix" (string-append #$guix "/share/locale"))
          (textdomain "guix")
          (setlocale LC_ALL locale))))

  (define (menu-entry->gexp entry)
    (let ((label (translate-label (menu-entry-label entry)))
          (kernel (menu-entry-linux entry))
          (kernel-arguments (menu-entry-linux-arguments entry))
          (initrd (menu-entry-initrd entry)))
      #~(format port "LABEL ~a
  MENU LABEL ~a
  KERNEL ~a
  FDTDIR ~a/lib/dtbs
  INITRD ~a
  APPEND ~a
~%"
                #$label #$label
                #$kernel (dirname #$kernel) #$initrd
                (string-join (list #$@kernel-arguments)))))

  (define builder
    #~(call-with-output-file #$output
        (lambda (port)
          #$init-gettext
          ;; Ensure xgettext extracts translatable messages
          ;; with our current keywords.
          (define G_ gettext)
          (let ((timeout #$(bootloader-configuration-timeout config)))
            (format port "~aUI menu.c32
MENU TITLE ~a
PROMPT ~a
TIMEOUT ~a~%"
                    (G_ "\
# This file was generated from your Guix configuration.  Any changes
# will be lost upon reconfiguration.
") ;; Keep line break to not duplicate grub.scm message.
                    (G_ "GNU Guix Boot Options")
                    (if (> timeout 0) 1 0)
                    ;; timeout is expressed in 1/10s of seconds.
                    (* 10 timeout))
            #$@(map menu-entry->gexp all-entries)

            #$@(if (pair? old-entries)
                   #~((format port "~%")
                      #$@(map menu-entry->gexp old-entries)
                      (format port "~%"))
                   #~())))))

  (computed-file "extlinux.conf" builder
                 #:options '(#:local-build? #t
                             #:substitutable? #f)))


\f

;;;
;;; Install procedures.
;;;

(define (install-extlinux mbr)
  #~(lambda (bootloader device mount-point)
      (let ((extlinux (string-append bootloader "/sbin/extlinux"))
            (install-dir (string-append mount-point "/boot/extlinux"))
            (syslinux-dir (string-append bootloader "/share/syslinux")))
        (for-each (lambda (file)
                    (install-file file install-dir))
                  (find-files syslinux-dir "\\.c32$"))
        (invoke/quiet extlinux "--install" install-dir)
        (write-file-on-device (string-append syslinux-dir "/" #$mbr)
                              440 device 0))))

(define install-extlinux-mbr
  (install-extlinux "mbr.bin"))

(define install-extlinux-gpt
  (install-extlinux "gptmbr.bin"))

\f

;;;
;;; Bootloader definitions.
;;;

(define extlinux-bootloader
  (bootloader
   (name 'extlinux)
   (package syslinux)
   (installer install-extlinux-mbr)
   (configuration-file "/boot/extlinux/extlinux.conf")
   (configuration-file-generator extlinux-configuration-file)))

(define extlinux-bootloader-gpt
  (bootloader
   (inherit extlinux-bootloader)
   (installer install-extlinux-gpt)))

debug log:

solving 36d0bcdae4 ...
found 36d0bcdae4 in https://yhetil.org/guix-patches/87o8kzpmjv.fsf@gmail.com/
found 6b5ff298e7 in https://git.savannah.gnu.org/cgit/guix.git
preparing index
index prepared:
100644 6b5ff298e747d51fce9c10f9a65ecba317c0429f	gnu/bootloader/extlinux.scm

applying [1/1] https://yhetil.org/guix-patches/87o8kzpmjv.fsf@gmail.com/
diff --git a/gnu/bootloader/extlinux.scm b/gnu/bootloader/extlinux.scm
index 6b5ff298e7..36d0bcdae4 100644

Checking patch gnu/bootloader/extlinux.scm...
Applied patch gnu/bootloader/extlinux.scm cleanly.

index at:
100644 36d0bcdae499fc16bf35e7ae8d2055e48e753a52	gnu/bootloader/extlinux.scm

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