194 lines
6.5 KiB
Scheme
194 lines
6.5 KiB
Scheme
;;; Guix --- Nix package management from Guile. -*- coding: utf-8 -*-
|
||
;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
|
||
;;;
|
||
;;; This file is part of Guix.
|
||
;;;
|
||
;;; 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.
|
||
;;;
|
||
;;; 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 Guix. If not, see <http://www.gnu.org/licenses/>.
|
||
|
||
(define-module (guix build download)
|
||
#:use-module (web uri)
|
||
#:use-module (web client)
|
||
#:use-module (web response)
|
||
#:use-module (guix ftp-client)
|
||
#:use-module (guix build utils)
|
||
#:use-module (rnrs io ports)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-11)
|
||
#:use-module (srfi srfi-26)
|
||
#:use-module (ice-9 match)
|
||
#:export (url-fetch))
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; Fetch data such as tarballs over HTTP or FTP (builder-side code).
|
||
;;;
|
||
;;; Code:
|
||
|
||
(define (ftp-fetch uri file)
|
||
"Fetch data from URI and write it to FILE. Return FILE on success."
|
||
(let* ((conn (ftp-open (uri-host uri)))
|
||
(in (ftp-retr conn (basename (uri-path uri))
|
||
(dirname (uri-path uri)))))
|
||
(call-with-output-file file
|
||
(lambda (out)
|
||
;; TODO: Show a progress bar.
|
||
(dump-port in out)))
|
||
|
||
(ftp-close conn))
|
||
file)
|
||
|
||
(define (open-connection-for-uri uri)
|
||
"Return an open input/output port for a connection to URI.
|
||
|
||
This is the same as Guile's `open-socket-for-uri', except that we always
|
||
use a numeric port argument, to avoid the need to go through libc's NSS,
|
||
which is not available during bootstrap."
|
||
(define addresses
|
||
(let ((port (or (uri-port uri)
|
||
(case (uri-scheme uri)
|
||
((http) 80) ; /etc/services, not for me!
|
||
(else
|
||
(error "unsupported URI scheme" uri))))))
|
||
(getaddrinfo (uri-host uri)
|
||
(number->string port)
|
||
AI_NUMERICSERV)))
|
||
|
||
(let loop ((addresses addresses))
|
||
(let* ((ai (car addresses))
|
||
(s (with-fluids ((%default-port-encoding #f))
|
||
(socket (addrinfo:fam ai) (addrinfo:socktype ai)
|
||
(addrinfo:protocol ai)))))
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(connect s (addrinfo:addr ai))
|
||
|
||
;; Buffer input and output on this port.
|
||
(setvbuf s _IOFBF)
|
||
;; Enlarge the receive buffer.
|
||
(setsockopt s SOL_SOCKET SO_RCVBUF (* 12 1024))
|
||
s)
|
||
(lambda args
|
||
;; Connection failed, so try one of the other addresses.
|
||
(close s)
|
||
(if (null? addresses)
|
||
(apply throw args)
|
||
(loop (cdr addresses))))))))
|
||
|
||
;; XXX: This is an awful hack to make sure the (set-port-encoding! p
|
||
;; "ISO-8859-1") call in `read-response' passes, even during bootstrap
|
||
;; where iconv is not available.
|
||
(module-define! (resolve-module '(web response))
|
||
'set-port-encoding!
|
||
(lambda (p e) #f))
|
||
|
||
;; XXX: Work around <http://bugs.gnu.org/13095>, present in Guile
|
||
;; up to 2.0.7.
|
||
(module-define! (resolve-module '(web client))
|
||
'shutdown (const #f))
|
||
|
||
(define (http-fetch uri file)
|
||
"Fetch data from URI and write it to FILE. Return FILE on success."
|
||
|
||
;; FIXME: Use a variant of `http-get' that returns a port instead of
|
||
;; loading everything in memory.
|
||
(let*-values (((connection)
|
||
(open-connection-for-uri uri))
|
||
((resp bv)
|
||
(http-get uri #:port connection #:decode-body? #f))
|
||
((code)
|
||
(response-code resp)))
|
||
(case code
|
||
((200) ; OK
|
||
(begin
|
||
(call-with-output-file file
|
||
(lambda (p)
|
||
(put-bytevector p bv)))
|
||
file))
|
||
((302) ; found (redirection)
|
||
(let ((uri (response-location resp)))
|
||
(format #t "following redirection to `~a'...~%"
|
||
(uri->string uri))
|
||
(close connection)
|
||
(http-fetch uri file)))
|
||
(else
|
||
(error "download failed" (uri->string uri)
|
||
code (response-reason-phrase resp))))))
|
||
|
||
|
||
(define-syntax-rule (false-if-exception* body ...)
|
||
"Like `false-if-exception', but print the exception on the error port."
|
||
(catch #t
|
||
(lambda ()
|
||
body ...)
|
||
(lambda (key . args)
|
||
#f)
|
||
(lambda (key . args)
|
||
(print-exception (current-error-port) #f key args))))
|
||
|
||
(define* (url-fetch url file #:key (mirrors '()))
|
||
"Fetch FILE from URL; URL may be either a single string, or a list of
|
||
string denoting alternate URLs for FILE. Return #f on failure, and FILE
|
||
on success."
|
||
(define (uri-vicinity dir file)
|
||
;; Concatenate DIR, slash, and FILE, keeping only one slash in between.
|
||
;; This is required by some HTTP servers.
|
||
(string-append (string-trim-right dir #\/) "/"
|
||
(string-trim file #\/)))
|
||
|
||
(define (maybe-expand-mirrors uri)
|
||
(case (uri-scheme uri)
|
||
((mirror)
|
||
(let ((kind (string->symbol (uri-host uri)))
|
||
(path (uri-path uri)))
|
||
(match (assoc-ref mirrors kind)
|
||
((mirrors ..1)
|
||
(map (compose string->uri (cut uri-vicinity <> path))
|
||
mirrors))
|
||
(_
|
||
(error "unsupported URL mirror kind" kind uri)))))
|
||
(else
|
||
(list uri))))
|
||
|
||
(define uri
|
||
(append-map maybe-expand-mirrors
|
||
(match url
|
||
((_ ...) (map string->uri url))
|
||
(_ (list (string->uri url))))))
|
||
|
||
(define (fetch uri file)
|
||
(format #t "starting download of `~a' from `~a'...~%"
|
||
file (uri->string uri))
|
||
(case (uri-scheme uri)
|
||
((http) (false-if-exception* (http-fetch uri file)))
|
||
((ftp) (false-if-exception* (ftp-fetch uri file)))
|
||
(else
|
||
(format #t "skipping URI with unsupported scheme: ~s~%"
|
||
uri)
|
||
#f)))
|
||
|
||
(setvbuf (current-output-port) _IOLBF)
|
||
(setvbuf (current-error-port) _IOLBF)
|
||
|
||
(let try ((uri uri))
|
||
(match uri
|
||
((uri tail ...)
|
||
(or (fetch uri file)
|
||
(try tail)))
|
||
(()
|
||
(format (current-error-port) "failed to download ~s from ~s~%"
|
||
file url)
|
||
#f))))
|
||
|
||
;;; download.scm ends here
|