import: Add buildroot importer.

* gnu/bootloader/u-boot.scm (install-buildroot-u-boot): New procedure.
* guix/import/buildroot.scm: New file.
* guix/scripts/import/buildroot.scm: New file.
* guix/scripts/import.scm (importers): Add it.
* Makefile.am (MODULES): Add them.

5 files changed, 241 insertions, 1 deletions

diff --git a/Makefile.am b/Makefile.am
index fa6bf8fe80..cf9d95e739 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -207,6 +207,7 @@ MODULES =					\
   guix/build/make-bootstrap.scm			\
   guix/search-paths.scm				\
   guix/packages.scm				\
+  guix/import/buildroot.scm			\
   guix/import/cabal.scm				\
   guix/import/cpan.scm				\
   guix/import/cran.scm				\
@@ -252,6 +253,7 @@ MODULES =					\
   guix/scripts/system/reconfigure.scm		\
   guix/scripts/lint.scm				\
   guix/scripts/challenge.scm			\
+  guix/scripts/import/buildroot.scm		\
   guix/scripts/import/crate.scm			\
   guix/scripts/import/cran.scm			\
   guix/scripts/import/elpa.scm  		\
diff --git a/gnu/bootloader/u-boot.scm b/gnu/bootloader/u-boot.scm
index 54abfe1c69..001edc5dac 100644
--- a/gnu/bootloader/u-boot.scm
+++ b/gnu/bootloader/u-boot.scm
@@ -21,6 +21,7 @@
   #:use-module (gnu bootloader extlinux)
   #:use-module (gnu bootloader)
   #:use-module (gnu packages bootloaders)
+  #:use-module (gnu packages genimage)
   #:use-module (guix gexp)
   #:export (u-boot-bootloader
             u-boot-a20-olinuxino-lime-bootloader
@@ -90,6 +91,12 @@
         (write-file-on-device u-boot (stat:size (stat u-boot))
                               device (* 512 512)))))
 
+(define install-buildroot-u-boot
+  #~(lambda (bootloader device mount-point)
+      ;; FIXME: Take genimage and a custom config from buildroot in order to install bootloader.
+      #$genimage
+      #f))
+
 
 
 ;;;
diff --git a/guix/import/buildroot.scm b/guix/import/buildroot.scm
new file mode 100644
index 0000000000..73801433dd
--- /dev/null
+++ b/guix/import/buildroot.scm
@@ -0,0 +1,137 @@
+;;; Copyright © 2018 Julien Lepiller <julien@lepiller.eu>
+;;;
+;;; 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 (guix import buildroot)
+  #:use-module (ice-9 ftw)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 peg)
+  #:use-module (ice-9 receive)
+  #:use-module ((ice-9 rdelim) #:select (read-line))
+  #:use-module (ice-9 textual-ports)
+  #:use-module (ice-9 vlist)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-2)
+  #:use-module (web uri)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system ocaml)
+  #:use-module (guix http-client)
+  #:use-module (guix git)
+  #:use-module (guix ui)
+  #:use-module (guix packages)
+  #:use-module (guix store)
+  #:use-module (guix upstream)
+  #:use-module (guix utils)
+  #:use-module (guix import utils)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:export (buildroot->guix-package))
+
+(define download
+  (memoize
+   (lambda* (url #:optional git)
+     (with-store store
+       (if git
+           (latest-repository-commit store url)
+           (download-to-store store url))))))
+
+(define (decomment line)
+  (match (string-split line #\#)
+   ((a b ...)
+    (string-trim a))))
+
+(define (read-configuration-file port)
+  (filter-map
+       (lambda (line)
+         (match (string-split (decomment line) #\=)
+          (("") ; comment etc
+           #f)
+          ((key value-string)
+           (cons key
+           (cond
+            ((string-prefix? "\"" value-string)
+             (substring value-string 1 (- (string-length value-string) 1))) ; FIXME: Be more correct.
+            ((string-prefix? "0" value-string)
+             (string->number value-string))
+            ((string-prefix? "1" value-string)
+             (string->number value-string))
+            ((string-prefix? "2" value-string)
+             (string->number value-string))
+            ((string-prefix? "3" value-string)
+             (string->number value-string))
+            ((string-prefix? "4" value-string)
+             (string->number value-string))
+            ((string-prefix? "5" value-string)
+             (string->number value-string))
+            ((string-prefix? "6" value-string)
+             (string->number value-string))
+            ((string-prefix? "7" value-string)
+             (string->number value-string))
+            ((string-prefix? "8" value-string)
+             (string->number value-string))
+            ((string-prefix? "9" value-string)
+             (string->number value-string))
+            (else
+             (string->symbol value-string)))))))
+       (read-lines port)))
+
+(define (buildroot->guix-package name)
+  (let* ((buildroot-root-directory
+          (download "git://git.buildroot.net/buildroot" #t))
+         (buildroot-configuration-directory
+          (string-append buildroot-root-directory "/configs"))
+         (buildroot-configuration-name
+          (string-append buildroot-configuration-directory "/" name))
+         (buildroot-configuration
+          (if (file-exists? buildroot-configuration-name)
+              (call-with-input-file buildroot-configuration-name read-configuration-file)
+              (begin
+                (display "Unknown buildroot configuration.  Possible values are: " (current-error-port))
+                (display (scandir buildroot-configuration-directory) (current-error-port))
+                (newline (current-error-port))
+                #f)))
+         (buildroot-board-directory
+          (string-append buildroot-root-directory "/board")))
+    (and buildroot-configuration (assoc-ref buildroot-configuration "BR2_TARGET_UBOOT_BOARD_DEFCONFIG")
+         (begin
+         ;(write buildroot-configuration)
+         ;(newline)
+          ; BR2_TARGET_UBOOT=y
+          ; BR2_TARGET_UBOOT_BOARD_DEFCONFIG="orangepi_zero"
+          ; BR2_TARGET_UBOOT_NEEDS_DTC=y
+          ; BR2_TARGET_UBOOT_FORMAT_CUSTOM=y
+          ; BR2_TARGET_UBOOT_FORMAT_CUSTOM_NAME="u-boot-sunxi-with-spl.bin"
+          ; BR2_TARGET_UBOOT_BOOT_SCRIPT=y
+          ; BR2_TARGET_UBOOT_BOOT_SCRIPT_SOURCE="board/orangepi/orangepi-zero/boot.cmd"
+          ; [BR2_PACKAGE_HOST_DOSFSTOOLS=y => install-buildroot-u-boot requires "dosfstools" package in profile]
+          ; BR2_PACKAGE_HOST_GENIMAGE=y => install-buildroot-u-boot requires "genimage" package in profile"
+          ; [BR2_PACKAGE_HOST_MTOOLS=y => install-buildroot-u-boot requires "mtools" package in profile]
+          ; [BR2_PACKAGE_HOST_UBOOT_TOOLS=y => install-buildroot-u-boot requires "u-boot-tools" package in profile]
+          ; BR2_ROOTFS_POST_IMAGE_SCRIPT
+          ; BR2_ROOTFS_POST_SCRIPT_ARGS
+          ; BR2_TARGET_ROOTFS_EXT2
+          ; BR2_TARGET_ROOTFS_EXT2_4
+          ; BR2_TARGET_ROOTFS_EXT2_SIZE
+          (values
+           `((bootloader
+             (inherit u-boot-bootloader)
+             (package
+              (make-u-boot-package
+               ,(string-append (assoc-ref buildroot-configuration "BR2_TARGET_UBOOT_BOARD_DEFCONFIG")
+                               "_defconfig")
+               (if (eq? (assoc-ref "BR2_aarch64" 'y)
+                        "aarch64-linux-gnu"
+                        "arm-linux-gnueabihf"))))
+             (installer install-buildroot-u-boot))))))))
diff --git a/guix/scripts/import.scm b/guix/scripts/import.scm
index c6cc93fad8..fc22bc3e19 100644
--- a/guix/scripts/import.scm
+++ b/guix/scripts/import.scm
@@ -76,7 +76,7 @@ rather than \\n."
 ;;;
 
 (define importers '("gnu" "nix" "pypi" "cpan" "hackage" "stackage" "elpa" "gem"
-                    "cran" "crate" "texlive" "json" "opam"))
+                    "cran" "crate" "texlive" "json" "opam" "buildroot"))
 
 (define (resolve-importer name)
   (let ((module (resolve-interface
diff --git a/guix/scripts/import/buildroot.scm b/guix/scripts/import/buildroot.scm
new file mode 100644
index 0000000000..05a4b86933
--- /dev/null
+++ b/guix/scripts/import/buildroot.scm
@@ -0,0 +1,94 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Julien Lepiller <julien@lepiller.eu>
+;;;
+;;; 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 (guix scripts import buildroot)
+  #:use-module (guix ui)
+  #:use-module (guix utils)
+  #:use-module (guix scripts)
+  #:use-module (guix import buildroot)
+  #:use-module (guix scripts import)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-37)
+  #:use-module (srfi srfi-41)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
+  #:export (guix-import-buildroot))
+
+
+;;;
+;;; Command-line options.
+;;;
+
+(define %default-options
+  '())
+
+(define (show-help)
+  (display (G_ "Usage: guix import buildroot CONFIG-NAME
+Import u-boot and board configuration for CONFIG-NAME.\n"))
+  (display (G_ "
+  -h, --help             display this help and exit"))
+  (display (G_ "
+  -V, --version          display version information and exit"))
+  (newline)
+  (show-bug-report-information))
+
+(define %options
+  ;; Specification of the command-line options.
+  (cons* (option '(#\h "help") #f #f
+                 (lambda args
+                   (show-help)
+                   (exit 0)))
+         (option '(#\V "version") #f #f
+                 (lambda args
+                   (show-version-and-exit "guix import buildroot")))
+         %standard-import-options))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-import-buildroot . args)
+  (define (parse-options)
+    ;; Return the alist of option values.
+    (args-fold* args %options
+                (lambda (opt name arg result)
+                  (leave (G_ "~A: unrecognized option~%") name))
+                (lambda (arg result)
+                  (alist-cons 'argument arg result))
+                %default-options))
+
+  (let* ((opts (parse-options))
+         (args (filter-map (match-lambda
+                            (('argument . value)
+                             value)
+                            (_ #f))
+                           (reverse opts))))
+    (match args
+      ((package-name)
+       ;; Single import
+       (let ((sexp (buildroot->guix-package package-name)))
+         (unless sexp
+           (leave (G_ "failed to download meta-data for config '~a'~%")
+                  package-name))
+         sexp))
+      (()
+       (leave (G_ "too few arguments~%")))
+      ((many ...)
+       (leave (G_ "too many arguments~%"))))))