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| | ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 Nikita Karetnikov <nikita@karetnikov.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 scripts prefetch)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module (guix store)
#:use-module (guix ui)
#:use-module (guix utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:use-module (ice-9 match)
#:export (guix-prefetch))
;;; Commentary:
;;;
;;; This program is used to download and add to the store all inputs that are
;;; needed to build the specified packages.
;;;
;;; Code:
(define (fold-values f acc seen lst)
(if (null-list? lst)
(values acc seen)
(let-values (((acc* seen*)
(f acc seen (first lst))))
(fold-values f
acc*
seen*
(cdr lst)))))
(define (derivations-to-prefetch store drv)
"Return the list of fixed-output derivations that DRV depends on, directly
or indirectly."
(define (unique-derivations acc seen lst)
;; Return two values: the list of unique fixed-output derivations and the
;; list of seen derivations.
(fold-values (lambda (acc seen drv-input)
(let ((drv* (call-with-input-file (derivation-input-path drv-input)
read-derivation)))
(cond ((fixed-output-derivation? drv*)
(values (lset-adjoin equal? acc drv*)
seen))
((member drv* seen)
(values acc seen))
(else
(unique-derivations acc
(cons drv* seen)
(derivation-inputs drv*))))))
acc
seen
lst))
(identity ; discard the second value
(unique-derivations '() '() (derivation-inputs drv))))
\f
;;;
;;; Command-line options.
;;;
(define %default-options
'())
(define (show-help)
(display (_ "Usage: guix prefetch [OPTION]... PACKAGES...
Download and add to the store all inputs that are needed to build
PACKAGES.\n"))
(display (_ "
-h, --help display this help and exit"))
(display (_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define %options
;; Specification of the command-line options.
(list (option '(#\h "help") #f #f
(lambda args
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix prefetch")))))
\f
;;;
;;; Entry point.
;;;
;; XXX: remove me.
(define specification->package+output
(@@ (guix scripts package) specification->package+output))
(define (guix-prefetch . args)
(define (parse-options)
;; Return the alist of option values.
(args-fold* args %options
(lambda (opt name arg result)
(leave (_ "~A: unrecognized option~%") name))
(lambda (arg result)
(alist-cons 'argument arg result))
%default-options))
(let ((opts (parse-options))
(store (open-connection)))
(map (lambda (package)
(format #t "Prefetching the derivations for '~a':~%"
(package-name package))
(build-derivations
store
(map (lambda (drv)
;; (format #t " ~a~%" (derivation-file-name drv))
(format #t " ~a~%" drv)
drv)
(derivations-to-prefetch
store
(package-derivation store package)))))
(delete-duplicates
(filter-map (match-lambda
(('argument . value)
(identity ; discard the second value
;; Check that all VALUEs in the list are valid
;; packages before calling 'derivations-to-prefetch'.
;; If VALUE is not a valid package,
;; 'specification->package+output' will raise an
;; error.
(specification->package+output value)))
(_ #f))
(reverse opts))))))
|