431 lines
17 KiB
Scheme
431 lines
17 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2015 Mark H Weaver <mhw@netris.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 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-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 (ice-9 match)
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#:use-module (ice-9 format)
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#:export (open-connection-for-uri
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resolve-uri-reference
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maybe-expand-mirrors
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url-fetch
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progress-proc
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uri-abbreviation))
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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 %http-receive-buffer-size
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;; Size of the HTTP receive buffer.
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65536)
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(define* (progress-proc file size #:optional (log-port (current-output-port)))
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"Return a procedure to show the progress of FILE's download, which is
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SIZE byte long. The returned procedure is suitable for use as an
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argument to `dump-port'. The progress report is written to LOG-PORT."
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(if (number? size)
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(lambda (transferred cont)
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(let ((% (* 100.0 (/ transferred size))))
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(display #\cr log-port)
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(format log-port "~a\t~5,1f% of ~,1f KiB"
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file % (/ size 1024.0))
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(flush-output-port log-port)
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(cont)))
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(lambda (transferred cont)
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(display #\cr log-port)
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(format log-port "~a\t~6,1f KiB transferred"
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file (/ transferred 1024.0))
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(flush-output-port log-port)
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(cont))))
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(define* (uri-abbreviation uri #:optional (max-length 42))
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"If URI's string representation is larger than MAX-LENGTH, return an
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abbreviation of URI showing the scheme, host, and basename of the file."
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(define uri-as-string
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(uri->string uri))
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(define (elide-path)
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(let ((path (uri-path uri)))
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(string-append (symbol->string (uri-scheme uri)) "://"
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;; `file' URIs have no host part.
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(or (uri-host uri) "")
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(string-append "/.../" (basename path)))))
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(if (> (string-length uri-as-string) max-length)
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(let ((short (elide-path)))
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(if (< (string-length short) (string-length uri-as-string))
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short
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uri-as-string))
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uri-as-string))
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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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(size (false-if-exception (ftp-size conn (uri-path 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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(dump-port in out
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#:buffer-size %http-receive-buffer-size
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#:progress (progress-proc (uri-abbreviation uri) size))))
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(ftp-close conn))
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(newline)
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file)
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;; Autoload GnuTLS so that this module can be used even when GnuTLS is
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;; not available. At compile time, this yields "possibly unbound
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;; variable" warnings, but these are OK: we know that the variables will
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;; be bound if we need them, because (guix download) adds GnuTLS as an
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;; input in that case.
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;; XXX: Use this hack instead of #:autoload to avoid compilation errors.
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;; See <http://bugs.gnu.org/12202>.
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(module-autoload! (current-module)
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'(gnutls) '(make-session connection-end/client))
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(define add-weak-reference
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(let ((table (make-weak-key-hash-table)))
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(lambda (from to)
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"Hold a weak reference from FROM to TO."
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(hashq-set! table from to))))
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(define (tls-wrap port server)
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"Return PORT wrapped in a TLS connection to SERVER. SERVER must be a DNS
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host name without trailing dot."
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(define (log level str)
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(format (current-error-port)
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"gnutls: [~a|~a] ~a" (getpid) level str))
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(let ((session (make-session connection-end/client)))
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;; Some servers such as 'cloud.github.com' require the client to support
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;; the 'SERVER NAME' extension. However, 'set-session-server-name!' is
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;; not available in older GnuTLS releases. See
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;; <http://bugs.gnu.org/18526> for details.
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(if (module-defined? (resolve-interface '(gnutls))
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'set-session-server-name!)
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(set-session-server-name! session server-name-type/dns server)
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(format (current-error-port)
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"warning: TLS 'SERVER NAME' extension not supported~%"))
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(set-session-transport-fd! session (fileno port))
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(set-session-default-priority! session)
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(set-session-credentials! session (make-certificate-credentials))
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;; Uncomment the following lines in case of debugging emergency.
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;;(set-log-level! 10)
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;;(set-log-procedure! log)
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(handshake session)
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(let ((record (session-record-port session)))
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;; Since we use `fileno' above, the file descriptor behind PORT would be
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;; closed when PORT is GC'd. If we used `port->fdes', it would instead
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;; never be closed. So we use `fileno', but keep a weak reference to
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;; PORT, so the file descriptor gets closed when RECORD is GC'd.
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(add-weak-reference record port)
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record)))
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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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((https) 443)
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(else
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(error "unsupported URI scheme" uri))))))
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(delete-duplicates (getaddrinfo (uri-host uri)
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(number->string port)
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AI_NUMERICSERV)
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(lambda (ai1 ai2)
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(equal? (addrinfo:addr ai1)
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(addrinfo:addr ai2))))))
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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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;; Restrict ourselves to TCP.
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(socket (addrinfo:fam ai) SOCK_STREAM IPPROTO_IP))))
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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 %http-receive-buffer-size)
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(if (eq? 'https (uri-scheme uri))
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(tls-wrap s (uri-host uri))
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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? (cdr 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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;; XXX: Work around <http://bugs.gnu.org/13095>, present in Guile
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;; up to 2.0.7.
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(module-define! (resolve-module '(web client))
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'shutdown (const #f))
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;; XXX: Work around <http://bugs.gnu.org/19840>, present in Guile
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;; up to 2.0.11.
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(unless (or (> (string->number (major-version)) 2)
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(> (string->number (minor-version)) 0)
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(> (string->number (micro-version)) 11))
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(let ((var (module-variable (resolve-module '(web http))
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'declare-relative-uri-header!)))
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;; If 'declare-relative-uri-header!' doesn't exist, forget it.
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(when (and var (variable-bound? var))
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(let ((declare-relative-uri-header! (variable-ref var)))
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(declare-relative-uri-header! "Location")))))
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(define (resolve-uri-reference ref base)
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"Resolve the URI reference REF, interpreted relative to the BASE URI, into a
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target URI, according to the algorithm specified in RFC 3986 section 5.2.2.
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Return the resulting target URI."
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(define (merge-paths base-path rel-path)
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(let* ((base-components (string-split base-path #\/))
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(base-directory-components (match base-components
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((components ... last) components)
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(() '())))
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(base-directory (string-join base-directory-components "/")))
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(string-append base-directory "/" rel-path)))
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(define (remove-dot-segments path)
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(let loop ((in
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;; Drop leading "." and ".." components from a relative path.
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;; (absolute paths will start with a "" component)
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(drop-while (match-lambda
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((or "." "..") #t)
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(_ #f))
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(string-split path #\/)))
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(out '()))
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(match in
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(("." . rest)
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(loop rest out))
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((".." . rest)
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(match out
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((or () (""))
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(error "remove-dot-segments: too many '..' components" path))
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(_
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(loop rest (cdr out)))))
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((component . rest)
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(loop rest (cons component out)))
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(()
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(string-join (reverse out) "/")))))
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(cond ((or (uri-scheme ref)
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(uri-host ref))
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(build-uri (or (uri-scheme ref)
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(uri-scheme base))
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#:userinfo (uri-userinfo ref)
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#:host (uri-host ref)
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#:port (uri-port ref)
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#:path (remove-dot-segments (uri-path ref))
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#:query (uri-query ref)
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#:fragment (uri-fragment ref)))
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((string-null? (uri-path ref))
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(build-uri (uri-scheme base)
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#:userinfo (uri-userinfo base)
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#:host (uri-host base)
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#:port (uri-port base)
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#:path (remove-dot-segments (uri-path base))
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#:query (or (uri-query ref)
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(uri-query base))
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#:fragment (uri-fragment ref)))
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(else
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(build-uri (uri-scheme base)
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#:userinfo (uri-userinfo base)
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#:host (uri-host base)
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#:port (uri-port base)
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#:path (remove-dot-segments
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(if (string-prefix? "/" (uri-path ref))
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(uri-path ref)
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(merge-paths (uri-path base)
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(uri-path ref))))
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#:query (uri-query ref)
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#:fragment (uri-fragment ref)))))
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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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(define post-2.0.7?
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(or (> (string->number (major-version)) 2)
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(> (string->number (minor-version)) 0)
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(> (string->number (micro-version)) 7)
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(string>? (version) "2.0.7")))
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(define headers
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'(;; Some web sites, such as http://dist.schmorp.de, would block you if
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;; there's no 'User-Agent' header, presumably on the assumption that
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;; you're a spammer. So work around that.
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(User-Agent . "GNU Guile")
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;; Some servers, such as https://alioth.debian.org, return "406 Not
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;; Acceptable" when not explicitly told that everything is accepted.
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(Accept . "*/*")))
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(let*-values (((connection)
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(open-connection-for-uri uri))
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((resp bv-or-port)
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;; XXX: `http-get*' was introduced in 2.0.7, and replaced by
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;; #:streaming? in 2.0.8. We know we're using it within the
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;; chroot, but `guix-download' might be using a different
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;; version. So keep this compatibility hack for now.
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(if post-2.0.7?
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(http-get uri #:port connection #:decode-body? #f
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#:streaming? #t
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#:headers headers)
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(if (module-defined? (resolve-interface '(web client))
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'http-get*)
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(http-get* uri #:port connection #:decode-body? #f
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#:headers headers)
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(http-get uri #:port connection #:decode-body? #f
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#:extra-headers headers))))
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((code)
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(response-code resp))
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((size)
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(response-content-length resp)))
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(case code
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((200) ; OK
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(begin
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(call-with-output-file file
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(lambda (p)
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(if (port? bv-or-port)
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(begin
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(dump-port bv-or-port p
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#:buffer-size %http-receive-buffer-size
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#:progress (progress-proc (uri-abbreviation uri)
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size))
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(newline))
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(put-bytevector p bv-or-port))))
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file))
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((301 ; moved permanently
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302) ; found (redirection)
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(let ((uri (resolve-uri-reference (response-location resp) uri)))
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(format #t "following redirection to `~a'...~%"
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(uri->string uri))
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(close connection)
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(http-fetch uri file)))
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(else
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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 (uri-vicinity dir file)
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"Concatenate DIR, slash, and FILE, keeping only one slash in between.
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This is required by some HTTP servers."
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(string-append (string-trim-right dir #\/) "/"
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(string-trim file #\/)))
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(define (maybe-expand-mirrors uri mirrors)
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"If URI uses the 'mirror' scheme, expand it according to the MIRRORS alist.
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Return a list of URIs."
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(case (uri-scheme uri)
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((mirror)
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(let ((kind (string->symbol (uri-host uri)))
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(path (uri-path uri)))
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(match (assoc-ref mirrors kind)
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((mirrors ..1)
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(map (compose string->uri (cut uri-vicinity <> path))
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mirrors))
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(_
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(error "unsupported URL mirror kind" kind uri)))))
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(else
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(list uri))))
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(define* (url-fetch url file #:key (mirrors '()))
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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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(append-map (cut maybe-expand-mirrors <> mirrors)
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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 https)
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(false-if-exception* (http-fetch uri file)))
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((ftp)
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(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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;; Make this unbuffered so 'progress-proc' works as expected. _IOLBF means
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;; '\n', not '\r', so it's not appropriate here.
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(setvbuf (current-output-port) _IONBF)
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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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