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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017, 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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 gnome)
#:use-module (guix upstream)
#:use-module (guix utils)
#:use-module (guix packages)
#:use-module (guix http-client)
#:use-module (json)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-34)
#:use-module (web uri)
#:use-module (ice-9 match)
#:export (%gnome-updater))
;;; Commentary:
;;;
;;; This package provides not an actual importer but simply an updater for
;;; GNOME packages. It grabs package meta-data from 'cache.json' files
;;; available on ftp.gnome.org.
;;;
;;; Code:
(define (jsonish->upstream-source name jsonish)
"Return an <upstream-source> object for package NAME, using JSONISH as the
source for metadata."
(match jsonish
((version . dictionary)
(upstream-source
(package name)
(version version)
(urls (filter-map (lambda (extension)
(match (assoc-ref dictionary extension)
(#f
#f)
((? string? relative-url)
(string-append "mirror://gnome/sources/"
name "/" relative-url))))
'("tar.lz" "tar.xz" "tar.bz2" "tar.gz")))))))
(define (latest-gnome-release package)
"Return the latest release of PACKAGE, a GNOME package, or #f if it could
not be determined."
(define %not-dot
(char-set-complement (char-set #\.)))
(define (even-minor-version? version)
(match (string-tokenize version %not-dot)
(((= string->number major) (= string->number minor) . rest)
(and minor (even? minor)))
(_
#t))) ;cross fingers
(define upstream-name
;; Some packages like "NetworkManager" have camel-case names.
(package-upstream-name package))
(guard (c ((http-get-error? c)
(if (= 404 (http-get-error-code c))
#f
(raise c))))
(let* ((port (http-fetch/cached
(string->uri (string-append
"https://ftp.gnome.org/pub/gnome/sources/"
upstream-name "/cache.json"))
;; ftp.gnome.org supports 'if-Modified-Since', so the local
;; cache can expire early.
#:ttl (* 60 10)))
(json (json->scm port)))
(close-port port)
(match json
(#(4 releases _ ...)
(let* ((releases (assoc-ref releases upstream-name))
(latest (fold (match-lambda*
(((key . value) result)
(cond ((even-minor-version? key)
(match result
(#f
(cons key value))
((newest . _)
(if (version>? key newest)
(cons key value)
result))))
(else
result))))
#f
releases)))
(and latest
(jsonish->upstream-source upstream-name latest))))))))
(define %gnome-updater
(upstream-updater
(name 'gnome)
(description "Updater for GNOME packages")
(pred (url-prefix-predicate "mirror://gnome/"))
(latest latest-gnome-release)))
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