147 lines
5.0 KiB
Scheme
147 lines
5.0 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix scripts download)
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#:use-module (guix ui)
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#:use-module (guix store)
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#:use-module (guix utils)
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#:use-module (guix base32)
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#:use-module ((guix download) #:select (%mirrors))
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#:use-module (guix build download)
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#:use-module (web uri)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-37)
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#:use-module (rnrs bytevectors)
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#:use-module (rnrs io ports)
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#:export (guix-download))
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(define (call-with-temporary-output-file proc)
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(let* ((template (string-copy "guix-download.XXXXXX"))
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(out (mkstemp! template)))
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(dynamic-wind
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(lambda ()
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#t)
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(lambda ()
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(proc template out))
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(lambda ()
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(false-if-exception (delete-file template))))))
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(define (fetch-and-store store fetch name)
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"Call FETCH for URI, and pass it the name of a file to write to; eventually,
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copy data from that port to STORE, under NAME. Return the resulting
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store path."
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(call-with-temporary-output-file
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(lambda (temp port)
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(let ((result
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(parameterize ((current-output-port (current-error-port)))
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(fetch temp))))
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(close port)
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(and result
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(add-to-store store name #f "sha256" temp))))))
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;;;
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;;; Command-line options.
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;;;
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(define %default-options
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;; Alist of default option values.
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`((format . ,bytevector->nix-base32-string)))
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(define (show-help)
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(display (_ "Usage: guix download [OPTION]... URL
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Download the file at URL, add it to the store, and print its store path
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and the hash of its contents.\n"))
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(format #t (_ "
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-f, --format=FMT write the hash in the given format (default: `nix-base32')"))
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(newline)
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(display (_ "
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-h, --help display this help and exit"))
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(display (_ "
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-V, --version display version information and exit"))
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(newline)
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(show-bug-report-information))
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(define %options
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;; Specifications of the command-line options.
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(list (option '(#\f "format") #t #f
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(lambda (opt name arg result)
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(define fmt-proc
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(match arg
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("nix-base32"
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bytevector->nix-base32-string)
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("base32"
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bytevector->base32-string)
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((or "base16" "hex" "hexadecimal")
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bytevector->base16-string)
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(x
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(format (current-error-port)
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"unsupported hash format: ~a~%" arg))))
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(alist-cons 'format fmt-proc
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(alist-delete 'format result))))
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(option '(#\h "help") #f #f
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(lambda args
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(show-help)
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(exit 0)))
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(option '(#\V "version") #f #f
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(lambda args
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(show-version-and-exit "guix-download")))))
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;;;
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;;; Entry point.
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;;;
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(define (guix-download . args)
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(define (parse-options)
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;; Return the alist of option values.
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(args-fold args %options
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(lambda (opt name arg result)
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(leave (_ "~A: unrecognized option~%") name))
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(lambda (arg result)
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(alist-cons 'argument arg result))
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%default-options))
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(let* ((opts (parse-options))
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(store (open-connection))
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(arg (assq-ref opts 'argument))
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(uri (or (string->uri arg)
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(leave (_ "guix-download: ~a: failed to parse URI~%")
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arg)))
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(path (case (uri-scheme uri)
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((file)
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(add-to-store store (basename (uri-path uri))
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#f "sha256" (uri-path uri)))
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(else
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(fetch-and-store store
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(cut url-fetch arg <>
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#:mirrors %mirrors)
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(basename (uri-path uri))))))
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(hash (call-with-input-file
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(or path
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(leave (_ "guix-download: ~a: download failed~%")
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arg))
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(compose sha256 get-bytevector-all)))
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(fmt (assq-ref opts 'format)))
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(format #t "~a~%~a~%" path (fmt hash))
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#t))
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