324 lines
12 KiB
Scheme
324 lines
12 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2012, 2013, 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 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)
|
||
#:use-module (ice-9 format)
|
||
#:export (url-fetch
|
||
progress-proc
|
||
uri-abbreviation))
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; Fetch data such as tarballs over HTTP or FTP (builder-side code).
|
||
;;;
|
||
;;; Code:
|
||
|
||
(define* (progress-proc file size #:optional (log-port (current-output-port)))
|
||
"Return a procedure to show the progress of FILE's download, which is
|
||
SIZE byte long. The returned procedure is suitable for use as an
|
||
argument to `dump-port'. The progress report is written to LOG-PORT."
|
||
(if (number? size)
|
||
(lambda (transferred cont)
|
||
(let ((% (* 100.0 (/ transferred size))))
|
||
(display #\cr log-port)
|
||
(format log-port "~a\t~5,1f% of ~,1f KiB"
|
||
file % (/ size 1024.0))
|
||
(flush-output-port log-port)
|
||
(cont)))
|
||
(lambda (transferred cont)
|
||
(display #\cr log-port)
|
||
(format log-port "~a\t~6,1f KiB transferred"
|
||
file (/ transferred 1024.0))
|
||
(flush-output-port log-port)
|
||
(cont))))
|
||
|
||
(define* (uri-abbreviation uri #:optional (max-length 42))
|
||
"If URI's string representation is larger than MAX-LENGTH, return an
|
||
abbreviation of URI showing the scheme, host, and basename of the file."
|
||
(define uri-as-string
|
||
(uri->string uri))
|
||
|
||
(define (elide-path)
|
||
(let ((path (uri-path uri)))
|
||
(string-append (symbol->string (uri-scheme uri)) "://"
|
||
|
||
;; `file' URIs have no host part.
|
||
(or (uri-host uri) "")
|
||
|
||
(string-append "/.../" (basename path)))))
|
||
|
||
(if (> (string-length uri-as-string) max-length)
|
||
(let ((short (elide-path)))
|
||
(if (< (string-length short) (string-length uri-as-string))
|
||
short
|
||
uri-as-string))
|
||
uri-as-string))
|
||
|
||
(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)))
|
||
(size (false-if-exception (ftp-size conn (uri-path uri))))
|
||
(in (ftp-retr conn (basename (uri-path uri))
|
||
(dirname (uri-path uri)))))
|
||
(call-with-output-file file
|
||
(lambda (out)
|
||
(dump-port in out
|
||
#:buffer-size 65536 ; don't flood the log
|
||
#:progress (progress-proc (uri-abbreviation uri) size))))
|
||
|
||
(ftp-close conn))
|
||
(newline)
|
||
file)
|
||
|
||
;; Autoload GnuTLS so that this module can be used even when GnuTLS is
|
||
;; not available. At compile time, this yields "possibly unbound
|
||
;; variable" warnings, but these are OK: we know that the variables will
|
||
;; be bound if we need them, because (guix download) adds GnuTLS as an
|
||
;; input in that case.
|
||
|
||
;; XXX: Use this hack instead of #:autoload to avoid compilation errors.
|
||
;; See <http://bugs.gnu.org/12202>.
|
||
(module-autoload! (current-module)
|
||
'(gnutls) '(make-session connection-end/client))
|
||
|
||
(define add-weak-reference
|
||
(let ((table (make-weak-key-hash-table)))
|
||
(lambda (from to)
|
||
"Hold a weak reference from FROM to TO."
|
||
(hashq-set! table from to))))
|
||
|
||
(define (tls-wrap port)
|
||
"Return PORT wrapped in a TLS connection."
|
||
(define (log level str)
|
||
(format (current-error-port)
|
||
"gnutls: [~a|~a] ~a" (getpid) level str))
|
||
|
||
(let ((session (make-session connection-end/client)))
|
||
(set-session-transport-fd! session (fileno port))
|
||
(set-session-default-priority! session)
|
||
(set-session-credentials! session (make-certificate-credentials))
|
||
|
||
;; Uncomment the following lines in case of debugging emergency.
|
||
;;(set-log-level! 10)
|
||
;;(set-log-procedure! log)
|
||
|
||
(handshake session)
|
||
(let ((record (session-record-port session)))
|
||
;; Since we use `fileno' above, the file descriptor behind PORT would be
|
||
;; closed when PORT is GC'd. If we used `port->fdes', it would instead
|
||
;; never be closed. So we use `fileno', but keep a weak reference to
|
||
;; PORT, so the file descriptor gets closed when RECORD is GC'd.
|
||
(add-weak-reference record port)
|
||
record)))
|
||
|
||
(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!
|
||
((https) 443)
|
||
(else
|
||
(error "unsupported URI scheme" uri))))))
|
||
(delete-duplicates (getaddrinfo (uri-host uri)
|
||
(number->string port)
|
||
AI_NUMERICSERV)
|
||
(lambda (ai1 ai2)
|
||
(equal? (addrinfo:addr ai1)
|
||
(addrinfo:addr ai2))))))
|
||
|
||
(let loop ((addresses addresses))
|
||
(let* ((ai (car addresses))
|
||
(s (with-fluids ((%default-port-encoding #f))
|
||
;; Restrict ourselves to TCP.
|
||
(socket (addrinfo:fam ai) SOCK_STREAM IPPROTO_IP))))
|
||
(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))
|
||
|
||
(if (eq? 'https (uri-scheme uri))
|
||
(tls-wrap s)
|
||
s))
|
||
(lambda args
|
||
;; Connection failed, so try one of the other addresses.
|
||
(close s)
|
||
(if (null? (cdr 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."
|
||
|
||
(define post-2.0.7?
|
||
(or (string>? (major-version) "2")
|
||
(string>? (minor-version) "0")
|
||
(string>? (micro-version) "7")
|
||
(string>? (version) "2.0.7")))
|
||
|
||
(define headers
|
||
;; Some web sites, such as http://dist.schmorp.de, would block you if
|
||
;; there's no 'User-Agent' header, presumably on the assumption that
|
||
;; you're a spammer. So work around that.
|
||
'((User-Agent . "GNU Guile")))
|
||
|
||
(let*-values (((connection)
|
||
(open-connection-for-uri uri))
|
||
((resp bv-or-port)
|
||
;; XXX: `http-get*' was introduced in 2.0.7, and replaced by
|
||
;; #:streaming? in 2.0.8. We know we're using it within the
|
||
;; chroot, but `guix-download' might be using a different
|
||
;; version. So keep this compatibility hack for now.
|
||
(if post-2.0.7?
|
||
(http-get uri #:port connection #:decode-body? #f
|
||
#:streaming? #t
|
||
#:headers headers)
|
||
(if (module-defined? (resolve-interface '(web client))
|
||
'http-get*)
|
||
(http-get* uri #:port connection #:decode-body? #f
|
||
#:headers headers)
|
||
(http-get uri #:port connection #:decode-body? #f
|
||
#:extra-headers headers))))
|
||
((code)
|
||
(response-code resp))
|
||
((size)
|
||
(response-content-length resp)))
|
||
(case code
|
||
((200) ; OK
|
||
(begin
|
||
(call-with-output-file file
|
||
(lambda (p)
|
||
(if (port? bv-or-port)
|
||
(begin
|
||
(dump-port bv-or-port p
|
||
#:buffer-size 65536 ; don't flood the log
|
||
#:progress (progress-proc (uri-abbreviation uri)
|
||
size))
|
||
(newline))
|
||
(put-bytevector p bv-or-port))))
|
||
file))
|
||
((301 ; moved permanently
|
||
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 https)
|
||
(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
|