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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 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 gnu)
#:use-module (guix gnu-maintenance)
#:use-module (guix utils)
#:use-module (guix store)
#:use-module (guix hash)
#:use-module (guix base32)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:export (gnu->guix-package))
;;; Commentary:
;;;
;;; Generate a package declaration template for the latest version of a GNU
;;; package, using meta-data available upstream for the package.
;;;
;;; Code:
(define (file-sha256 file)
"Return the SHA256 hash of FILE as a bytevector."
(call-with-input-file file port-sha256))
(define (qualified-url url)
"Return a fully-qualified URL based on URL."
(if (string-prefix? "/" url)
(string-append "http://www.gnu.org" url)
url))
(define (preferred-archive-type release)
"Return the preferred type of archive for downloading RELEASE."
(find (cute member <> (gnu-release-archive-types release))
'("xz" "lz" "bz2" "tbz2" "gz" "tgz" "Z")))
(define* (gnu-package->sexp package release
#:key (key-download 'interactive))
"Return the 'package' sexp for the RELEASE (a <gnu-release>) of PACKAGE (a
<gnu-package>). Use KEY-DOWNLOAD as the OpenPGP key download policy (see
'download-tarball' for details.)"
(define name
(gnu-package-name package))
(define url-base
;; XXX: We assume that RELEASE's directory starts with "/gnu".
(string-append "mirror:/" (gnu-release-directory release)
"/" name "-"))
(define archive-type
(preferred-archive-type release))
(let ((tarball (with-store store
(download-tarball store name
(gnu-release-directory release)
(gnu-release-version release)
#:archive-type archive-type
#:key-download key-download))))
`(package
(name ,name)
(version ,(gnu-release-version release))
(source (origin
(method url-fetch)
(uri (string-append ,url-base version
,(string-append ".tar." archive-type)))
(sha256
(base32
,(bytevector->base32-string (file-sha256 tarball))))))
(build-system gnu-build-system)
(synopsis ,(gnu-package-doc-summary package))
(description ,(gnu-package-doc-description package))
(home-page ,(match (gnu-package-doc-urls package)
((head . tail) (qualified-url head))))
(license find-by-yourself!))))
(define* (gnu->guix-package name
#:key (key-download 'interactive))
"Return the package declaration for NAME as an s-expression. Use
KEY-DOWNLOAD as the OpenPGP key download policy (see 'download-tarball' for
details.)"
(match (latest-release name)
((? gnu-release? release)
(let ((version (gnu-release-version release)))
(match (find-packages (regexp-quote name))
((info . _)
(gnu-package->sexp info release))
(()
(raise (condition
(&message
(message "couldn't find meta-data for GNU package"))))))))
(_
(raise (condition
(&message
(message
"failed to determine latest release of GNU package")))))))
;;; gnu.scm ends here
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