126 lines
4.7 KiB
Scheme
126 lines
4.7 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017, 2019, 2020 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 build download-nar)
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#:use-module (guix build download)
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#:use-module (guix build utils)
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#:use-module ((guix serialization) #:hide (dump-port*))
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#:use-module (guix zlib)
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#:use-module (guix progress)
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#:use-module (web uri)
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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 format)
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#:use-module (ice-9 match)
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#:export (download-nar))
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;;; Commentary:
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;;;
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;;; Download a normalized archive or "nar", similar to what 'guix substitute'
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;;; does. The intent here is to use substitute servers as content-addressed
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;;; mirrors of VCS checkouts. This is mostly useful for users who have
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;;; disabled substitutes.
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;;;
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;;; Code:
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(define (urls-for-item item)
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"Return the fallback nar URL for ITEM--e.g.,
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\"/gnu/store/cabbag3…-foo-1.2-checkout\"."
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;; Here we hard-code nar URLs without checking narinfos. That's probably OK
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;; though. Use berlin.guix.gnu.org instead of its ci.guix.gnu.org front end to
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;; avoid sending these requests to CDN providers without user consent.
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;; TODO: Use HTTPS? The downside is the extra dependency.
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(let ((bases '("http://berlin.guix.gnu.org"))
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(item (basename item)))
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(append (map (cut string-append <> "/nar/gzip/" item) bases)
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(map (cut string-append <> "/nar/" item) bases))))
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(define (restore-gzipped-nar port item size)
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"Restore the gzipped nar read from PORT, of SIZE bytes (compressed), to
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ITEM."
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;; Since PORT is typically a non-file port (for instance because 'http-get'
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;; returns a delimited port), create a child process so we're back to a file
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;; port that can be passed to 'call-with-gzip-input-port'.
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(match (pipe)
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((input . output)
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(match (primitive-fork)
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(0
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(dynamic-wind
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(const #t)
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(lambda ()
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(close-port output)
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(close-port port)
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(catch #t
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(lambda ()
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(call-with-gzip-input-port input
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(cut restore-file <> item)))
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(lambda (key . args)
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(print-exception (current-error-port)
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(stack-ref (make-stack #t) 1)
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key args)
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(primitive-exit 1))))
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(lambda ()
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(primitive-exit 0))))
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(child
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(close-port input)
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(dump-port* port output
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#:reporter (progress-reporter/file item size
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#:abbreviation
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store-path-abbreviation))
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(close-port output)
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(newline)
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(match (waitpid child)
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((_ . status)
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(unless (zero? status)
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(error "nar decompression failed" status)))))))))
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(define (download-nar item)
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"Download and extract the normalized archive for ITEM. Return #t on
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success, #f otherwise."
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;; Let progress reports go through.
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(setvbuf (current-error-port) 'none)
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(setvbuf (current-output-port) 'none)
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(let loop ((urls (urls-for-item item)))
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(match urls
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((url rest ...)
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(format #t "Trying content-addressed mirror at ~a...~%"
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(uri-host (string->uri url)))
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(let-values (((port size)
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(catch #t
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(lambda ()
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(http-fetch (string->uri url)))
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(lambda args
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(values #f #f)))))
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(if (not port)
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(loop rest)
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(begin
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(if size
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(format #t "Downloading from ~a (~,2h MiB)...~%" url
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(/ size (expt 2 20.)))
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(format #t "Downloading from ~a...~%" url))
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(if (string-contains url "/gzip")
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(restore-gzipped-nar port item size)
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(begin
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;; FIXME: Add progress report.
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(restore-file port item)
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(close-port port)))
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#t))))
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(()
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#f))))
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