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