917 lines
35 KiB
Scheme
Executable File
917 lines
35 KiB
Scheme
Executable File
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2014 Nikita Karetnikov <nikita@karetnikov.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 scripts substitute)
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#:use-module (guix ui)
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#:use-module (guix store)
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#:use-module (guix utils)
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#:use-module (guix config)
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#:use-module (guix records)
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#:use-module (guix serialization)
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#:use-module (guix hash)
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#:use-module (guix base32)
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#:use-module (guix base64)
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#:use-module (guix pk-crypto)
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#:use-module (guix pki)
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#:use-module ((guix build utils) #:select (mkdir-p dump-port))
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#:use-module ((guix build download)
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#:select (progress-proc uri-abbreviation))
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 regex)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:use-module (ice-9 ftw)
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#:use-module (ice-9 binary-ports)
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#:use-module (rnrs io ports)
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#:use-module (rnrs bytevectors)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-19)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:use-module (web uri)
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#:use-module (web request)
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#:use-module (web response)
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#:use-module (guix http-client)
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#:export (narinfo-signature->canonical-sexp
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read-narinfo
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write-narinfo
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guix-substitute))
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;;; Comment:
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;;;
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;;; This is the "binary substituter". It is invoked by the daemon do check
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;;; for the existence of available "substitutes" (pre-built binaries), and to
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;;; actually use them as a substitute to building things locally.
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;;;
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;;; If possible, substitute a binary for the requested store path, using a Nix
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;;; "binary cache". This program implements the Nix "substituter" protocol.
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;;;
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;;; Code:
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(define %narinfo-cache-directory
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;; A local cache of narinfos, to avoid going to the network.
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(or (and=> (getenv "XDG_CACHE_HOME")
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(cut string-append <> "/guix/substitute"))
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(string-append %state-directory "/substitute/cache")))
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(define %allow-unauthenticated-substitutes?
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;; Whether to allow unchecked substitutes. This is useful for testing
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;; purposes, and should be avoided otherwise.
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(and (and=> (getenv "GUIX_ALLOW_UNAUTHENTICATED_SUBSTITUTES")
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(cut string-ci=? <> "yes"))
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(begin
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(warning (_ "authentication and authorization of substitutes \
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disabled!~%"))
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#t)))
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(define %narinfo-ttl
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;; Number of seconds during which cached narinfo lookups are considered
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;; valid. This is a reasonable default value (corresponds to the TTL for
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;; nginx's .nar cache on hydra.gnu.org) but we'd rather want publishers to
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;; state what their TTL is in /nix-cache-info. (XXX)
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(* 36 3600))
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(define %narinfo-negative-ttl
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;; Likewise, but for negative lookups---i.e., cached lookup failures.
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(* 3 3600))
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(define %narinfo-expired-cache-entry-removal-delay
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;; How often we want to remove files corresponding to expired cache entries.
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(* 7 24 3600))
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(define fields->alist
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;; The narinfo format is really just like recutils.
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recutils->alist)
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(define %fetch-timeout
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;; Number of seconds after which networking is considered "slow".
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5)
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(define %random-state
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(seed->random-state (+ (ash (cdr (gettimeofday)) 32) (getpid))))
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(define-syntax-rule (with-timeout duration handler body ...)
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"Run BODY; when DURATION seconds have expired, call HANDLER, and run BODY
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again."
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(begin
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(sigaction SIGALRM
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(lambda (signum)
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(sigaction SIGALRM SIG_DFL)
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handler))
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(alarm duration)
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(call-with-values
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(lambda ()
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(let try ()
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(catch 'system-error
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(lambda ()
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body ...)
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(lambda args
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;; Before Guile v2.0.9-39-gfe51c7b, the SIGALRM triggers EINTR
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;; because of the bug at
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;; <http://lists.gnu.org/archive/html/guile-devel/2013-06/msg00050.html>.
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;; When that happens, try again. Note: SA_RESTART cannot be
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;; used because of <http://bugs.gnu.org/14640>.
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(if (= EINTR (system-error-errno args))
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(begin
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;; Wait a little to avoid bursts.
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(usleep (random 3000000 %random-state))
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(try))
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(apply throw args))))))
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(lambda result
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(alarm 0)
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(sigaction SIGALRM SIG_DFL)
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(apply values result)))))
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(define* (fetch uri #:key (buffered? #t) (timeout? #t) (quiet-404? #f))
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"Return a binary input port to URI and the number of bytes it's expected to
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provide. If QUIET-404? is true, HTTP 404 error conditions are passed through
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to the caller without emitting an error message."
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(case (uri-scheme uri)
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((file)
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(let ((port (open-file (uri-path uri)
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(if buffered? "rb" "r0b"))))
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(values port (stat:size (stat port)))))
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((http)
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(guard (c ((http-get-error? c)
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(let ((code (http-get-error-code c)))
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(if (and (= code 404) quiet-404?)
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(raise c)
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(leave (_ "download from '~a' failed: ~a, ~s~%")
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(uri->string (http-get-error-uri c))
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code (http-get-error-reason c))))))
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;; Test this with:
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;; sudo tc qdisc add dev eth0 root netem delay 1500ms
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;; and then cancel with:
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;; sudo tc qdisc del dev eth0 root
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(let ((port #f))
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(with-timeout (if timeout?
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%fetch-timeout
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0)
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(begin
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(warning (_ "while fetching ~a: server is somewhat slow~%")
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(uri->string uri))
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(warning (_ "try `--no-substitutes' if the problem persists~%"))
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;; Before Guile v2.0.9-39-gfe51c7b, EINTR was reported to the user,
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;; and thus PORT had to be closed and re-opened. This is not the
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;; case afterward.
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(unless (or (guile-version>? "2.0.9")
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(version>? (version) "2.0.9.39"))
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(when port
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(close-port port))))
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(begin
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(when (or (not port) (port-closed? port))
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(set! port (open-socket-for-uri uri))
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(unless buffered?
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(setvbuf port _IONBF)))
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(http-fetch uri #:text? #f #:port port))))))))
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(define-record-type <cache-info>
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(%make-cache-info url store-directory wants-mass-query?)
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cache-info?
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(url cache-info-url)
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(store-directory cache-info-store-directory)
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(wants-mass-query? cache-info-wants-mass-query?))
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(define (download-cache-info url)
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"Download the information for the cache at URL. Return a <cache-info>
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object on success, or #f on failure."
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(define (download url)
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;; Download the `nix-cache-info' from URL, and return its contents as an
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;; list of key/value pairs.
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(and=> (false-if-exception (fetch (string->uri url)))
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fields->alist))
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(and=> (download (string-append url "/nix-cache-info"))
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(lambda (properties)
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(alist->record properties
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(cut %make-cache-info url <...>)
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'("StoreDir" "WantMassQuery")))))
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(define-record-type <narinfo>
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(%make-narinfo path uri uri-base compression file-hash file-size nar-hash nar-size
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references deriver system signature contents)
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narinfo?
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(path narinfo-path)
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(uri narinfo-uri)
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(uri-base narinfo-uri-base) ; URI of the cache it originates from
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(compression narinfo-compression)
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(file-hash narinfo-file-hash)
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(file-size narinfo-file-size)
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(nar-hash narinfo-hash)
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(nar-size narinfo-size)
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(references narinfo-references)
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(deriver narinfo-deriver)
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(system narinfo-system)
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(signature narinfo-signature) ; canonical sexp
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;; The original contents of a narinfo file. This field is needed because we
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;; want to preserve the exact textual representation for verification purposes.
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;; See <https://lists.gnu.org/archive/html/guix-devel/2014-02/msg00340.html>
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;; for more information.
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(contents narinfo-contents))
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(define (narinfo-signature->canonical-sexp str)
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"Return the value of a narinfo's 'Signature' field as a canonical sexp."
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(match (string-split str #\;)
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((version _ sig)
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(let ((maybe-number (string->number version)))
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(cond ((not (number? maybe-number))
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(leave (_ "signature version must be a number: ~s~%")
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version))
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;; Currently, there are no other versions.
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((not (= 1 maybe-number))
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(leave (_ "unsupported signature version: ~a~%")
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maybe-number))
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(else
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(let ((signature (utf8->string (base64-decode sig))))
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(catch 'gcry-error
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(lambda ()
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(string->canonical-sexp signature))
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(lambda (key proc err)
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(leave (_ "signature is not a valid \
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s-expression: ~s~%")
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signature))))))))
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(x
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(leave (_ "invalid format of the signature field: ~a~%") x))))
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(define (narinfo-maker str cache-url)
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"Return a narinfo constructor for narinfos originating from CACHE-URL. STR
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must contain the original contents of a narinfo file."
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(lambda (path url compression file-hash file-size nar-hash nar-size
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references deriver system signature)
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"Return a new <narinfo> object."
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(%make-narinfo path
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;; Handle the case where URL is a relative URL.
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(or (string->uri url)
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(string->uri (string-append cache-url "/" url)))
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cache-url
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compression file-hash
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(and=> file-size string->number)
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nar-hash
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(and=> nar-size string->number)
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(string-tokenize references)
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(match deriver
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((or #f "") #f)
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(_ deriver))
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system
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(false-if-exception
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(and=> signature narinfo-signature->canonical-sexp))
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str)))
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(define* (assert-valid-signature narinfo signature hash
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#:optional (acl (current-acl)))
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"Bail out if SIGNATURE, a canonical sexp representing the signature of
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NARINFO, doesn't match HASH, a bytevector containing the hash of NARINFO."
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(let ((uri (uri->string (narinfo-uri narinfo))))
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(signature-case (signature hash acl)
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(valid-signature #t)
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(invalid-signature
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(leave (_ "invalid signature for '~a'~%") uri))
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(hash-mismatch
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(leave (_ "hash mismatch for '~a'~%") uri))
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(unauthorized-key
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(leave (_ "'~a' is signed with an unauthorized key~%") uri))
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(corrupt-signature
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(leave (_ "signature on '~a' is corrupt~%") uri)))))
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(define* (read-narinfo port #:optional url
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#:key size)
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"Read a narinfo from PORT. If URL is true, it must be a string used to
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build full URIs from relative URIs found while reading PORT. When SIZE is
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true, read at most SIZE bytes from PORT; otherwise, read as much as possible.
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No authentication and authorization checks are performed here!"
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(let ((str (utf8->string (if size
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(get-bytevector-n port size)
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(get-bytevector-all port)))))
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(alist->record (call-with-input-string str fields->alist)
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(narinfo-maker str url)
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'("StorePath" "URL" "Compression"
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"FileHash" "FileSize" "NarHash" "NarSize"
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"References" "Deriver" "System"
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"Signature"))))
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(define (narinfo-sha256 narinfo)
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"Return the sha256 hash of NARINFO as a bytevector, or #f if NARINFO lacks a
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'Signature' field."
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(let ((contents (narinfo-contents narinfo)))
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(match (string-contains contents "Signature:")
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(#f #f)
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(index
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(let ((above-signature (string-take contents index)))
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(sha256 (string->utf8 above-signature)))))))
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(define* (assert-valid-narinfo narinfo
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#:optional (acl (current-acl))
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#:key (verbose? #t))
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"Raise an exception if NARINFO lacks a signature, has an invalid signature,
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or is signed by an unauthorized key."
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(let ((hash (narinfo-sha256 narinfo)))
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(if (not hash)
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(if %allow-unauthenticated-substitutes?
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narinfo
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(leave (_ "substitute at '~a' lacks a signature~%")
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(uri->string (narinfo-uri narinfo))))
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(let ((signature (narinfo-signature narinfo)))
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(unless %allow-unauthenticated-substitutes?
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(assert-valid-signature narinfo signature hash acl)
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(when verbose?
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(format (current-error-port)
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"found valid signature for '~a', from '~a'~%"
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(narinfo-path narinfo)
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(uri->string (narinfo-uri narinfo)))))
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narinfo))))
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(define* (valid-narinfo? narinfo #:optional (acl (current-acl)))
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"Return #t if NARINFO's signature is not valid."
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(or %allow-unauthenticated-substitutes?
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(let ((hash (narinfo-sha256 narinfo))
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(signature (narinfo-signature narinfo)))
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(and hash signature
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(signature-case (signature hash acl)
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(valid-signature #t)
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(else #f))))))
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(define (write-narinfo narinfo port)
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"Write NARINFO to PORT."
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(put-bytevector port (string->utf8 (narinfo-contents narinfo))))
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(define (narinfo->string narinfo)
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"Return the external representation of NARINFO."
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(call-with-output-string (cut write-narinfo narinfo <>)))
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(define (string->narinfo str cache-uri)
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"Return the narinfo represented by STR. Assume CACHE-URI as the base URI of
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the cache STR originates form."
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(call-with-input-string str (cut read-narinfo <> cache-uri)))
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(define (obsolete? date now ttl)
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"Return #t if DATE is obsolete compared to NOW + TTL seconds."
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(time>? (subtract-duration now (make-time time-duration 0 ttl))
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(make-time time-monotonic 0 date)))
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(define (narinfo-cache-file cache-url path)
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"Return the name of the local file that contains an entry for PATH. The
|
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entry is stored in a sub-directory specific to CACHE-URL."
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(string-append %narinfo-cache-directory "/"
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(bytevector->base32-string (sha256 (string->utf8 cache-url)))
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"/" (store-path-hash-part path)))
|
||
|
||
(define (cached-narinfo cache-url path)
|
||
"Check locally if we have valid info about PATH coming from CACHE-URL.
|
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Return two values: a Boolean indicating whether we have valid cached info, and
|
||
that info, which may be either #f (when PATH is unavailable) or the narinfo
|
||
for PATH."
|
||
(define now
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||
(current-time time-monotonic))
|
||
|
||
(define cache-file
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(narinfo-cache-file cache-url path))
|
||
|
||
(catch 'system-error
|
||
(lambda ()
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||
(call-with-input-file cache-file
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||
(lambda (p)
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||
(match (read p)
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||
(('narinfo ('version 1)
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||
('cache-uri cache-uri)
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||
('date date) ('value #f))
|
||
;; A cached negative lookup.
|
||
(if (obsolete? date now %narinfo-negative-ttl)
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||
(values #f #f)
|
||
(values #t #f)))
|
||
(('narinfo ('version 1)
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||
('cache-uri cache-uri)
|
||
('date date) ('value value))
|
||
;; A cached positive lookup
|
||
(if (obsolete? date now %narinfo-ttl)
|
||
(values #f #f)
|
||
(values #t (string->narinfo value cache-uri))))
|
||
(('narinfo ('version v) _ ...)
|
||
(values #f #f))))))
|
||
(lambda _
|
||
(values #f #f))))
|
||
|
||
(define (cache-narinfo! cache-url path narinfo)
|
||
"Cache locally NARNIFO for PATH, which originates from CACHE-URL. NARINFO
|
||
may be #f, in which case it indicates that PATH is unavailable at CACHE-URL."
|
||
(define now
|
||
(current-time time-monotonic))
|
||
|
||
(define (cache-entry cache-uri narinfo)
|
||
`(narinfo (version 1)
|
||
(cache-uri ,cache-uri)
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||
(date ,(time-second now))
|
||
(value ,(and=> narinfo narinfo->string))))
|
||
|
||
(let ((file (narinfo-cache-file cache-url path)))
|
||
(mkdir-p (dirname file))
|
||
(with-atomic-file-output file
|
||
(lambda (out)
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||
(write (cache-entry cache-url narinfo) out))))
|
||
|
||
narinfo)
|
||
|
||
(define (narinfo-request cache-url path)
|
||
"Return an HTTP request for the narinfo of PATH at CACHE-URL."
|
||
(let ((url (string-append cache-url "/" (store-path-hash-part path)
|
||
".narinfo")))
|
||
(build-request (string->uri url) #:method 'GET)))
|
||
|
||
(define (http-multiple-get base-url requests proc)
|
||
"Send all of REQUESTS to the server at BASE-URL. Call PROC for each
|
||
response, passing it the request object, the response, and a port from which
|
||
to read the response body. Return the list of results."
|
||
(let connect ((requests requests)
|
||
(result '()))
|
||
;; (format (current-error-port) "connecting (~a requests left)..."
|
||
;; (length requests))
|
||
(let ((p (open-socket-for-uri base-url)))
|
||
;; Send all of REQUESTS in a row.
|
||
(setvbuf p _IOFBF (expt 2 16))
|
||
(for-each (cut write-request <> p) requests)
|
||
(force-output p)
|
||
|
||
;; Now start processing responses.
|
||
(let loop ((requests requests)
|
||
(result result))
|
||
(match requests
|
||
(()
|
||
(reverse result))
|
||
((head tail ...)
|
||
(let* ((resp (read-response p))
|
||
(body (response-body-port resp))
|
||
(result (cons (proc head resp body) result)))
|
||
;; The server can choose to stop responding at any time, in which
|
||
;; case we have to try again. Check whether that is the case.
|
||
;; Note that even upon "Connection: close", we can read from BODY.
|
||
(match (assq 'connection (response-headers resp))
|
||
(('connection 'close)
|
||
(close-port p)
|
||
(connect tail result)) ;try again
|
||
(_
|
||
(loop tail result)))))))))) ;keep going
|
||
|
||
(define (read-to-eof port)
|
||
"Read from PORT until EOF is reached. The data are discarded."
|
||
(dump-port port (%make-void-port "w")))
|
||
|
||
(define (narinfo-from-file file url)
|
||
"Attempt to read a narinfo from FILE, using URL as the cache URL. Return #f
|
||
if file doesn't exist, and the narinfo otherwise."
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(call-with-input-file file
|
||
(cut read-narinfo <> url)))
|
||
(lambda args
|
||
(if (= ENOENT (system-error-errno args))
|
||
#f
|
||
(apply throw args)))))
|
||
|
||
(define (fetch-narinfos url paths)
|
||
"Retrieve all the narinfos for PATHS from the cache at URL and return them."
|
||
(define update-progress!
|
||
(let ((done 0))
|
||
(lambda ()
|
||
(display #\cr (current-error-port))
|
||
(force-output (current-error-port))
|
||
(format (current-error-port)
|
||
(_ "updating list of substitutes from '~a'... ~5,1f%")
|
||
url (* 100. (/ done (length paths))))
|
||
(set! done (+ 1 done)))))
|
||
|
||
(define (handle-narinfo-response request response port)
|
||
(let ((len (response-content-length response)))
|
||
;; Make sure to read no more than LEN bytes since subsequent bytes may
|
||
;; belong to the next response.
|
||
(case (response-code response)
|
||
((200) ; hit
|
||
(let ((narinfo (read-narinfo port url #:size len)))
|
||
(cache-narinfo! url (narinfo-path narinfo) narinfo)
|
||
(update-progress!)
|
||
narinfo))
|
||
((404) ; failure
|
||
(let* ((path (uri-path (request-uri request)))
|
||
(hash-part (string-drop-right path 8))) ; drop ".narinfo"
|
||
(if len
|
||
(get-bytevector-n port len)
|
||
(read-to-eof port))
|
||
(cache-narinfo! url
|
||
(find (cut string-contains <> hash-part) paths)
|
||
#f)
|
||
(update-progress!))
|
||
#f)
|
||
(else ; transient failure
|
||
(if len
|
||
(get-bytevector-n port len)
|
||
(read-to-eof port))
|
||
#f))))
|
||
|
||
(define cache-info
|
||
(download-cache-info url))
|
||
|
||
(and cache-info
|
||
(string=? (cache-info-store-directory cache-info)
|
||
(%store-prefix))
|
||
(let ((uri (string->uri url)))
|
||
(case (and=> uri uri-scheme)
|
||
((http)
|
||
(let ((requests (map (cut narinfo-request url <>) paths)))
|
||
(update-progress!)
|
||
(let ((result (http-multiple-get url requests
|
||
handle-narinfo-response)))
|
||
(newline (current-error-port))
|
||
result)))
|
||
((file #f)
|
||
(let* ((base (string-append (uri-path uri) "/"))
|
||
(files (map (compose (cut string-append base <> ".narinfo")
|
||
store-path-hash-part)
|
||
paths)))
|
||
(filter-map (cut narinfo-from-file <> url) files)))
|
||
(else
|
||
(leave (_ "~s: unsupported server URI scheme~%")
|
||
(if uri (uri-scheme uri) url)))))))
|
||
|
||
(define (lookup-narinfos cache paths)
|
||
"Return the narinfos for PATHS, invoking the server at CACHE when no
|
||
information is available locally."
|
||
(let-values (((cached missing)
|
||
(fold2 (lambda (path cached missing)
|
||
(let-values (((valid? value)
|
||
(cached-narinfo cache path)))
|
||
(if valid?
|
||
(values (cons value cached) missing)
|
||
(values cached (cons path missing)))))
|
||
'()
|
||
'()
|
||
paths)))
|
||
(if (null? missing)
|
||
cached
|
||
(let ((missing (fetch-narinfos cache missing)))
|
||
(append cached (or missing '()))))))
|
||
|
||
(define (lookup-narinfo cache path)
|
||
"Return the narinfo for PATH in CACHE, or #f when no substitute for PATH was
|
||
found."
|
||
(match (lookup-narinfos cache (list path))
|
||
((answer) answer)))
|
||
|
||
(define (remove-expired-cached-narinfos directory)
|
||
"Remove expired narinfo entries from DIRECTORY. The sole purpose of this
|
||
function is to make sure `%narinfo-cache-directory' doesn't grow
|
||
indefinitely."
|
||
(define now
|
||
(current-time time-monotonic))
|
||
|
||
(define (expired? file)
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(call-with-input-file file
|
||
(lambda (port)
|
||
(match (read port)
|
||
(('narinfo ('version 1) ('cache-uri _) ('date date)
|
||
('value #f))
|
||
(obsolete? date now %narinfo-negative-ttl))
|
||
(('narinfo ('version 1) ('cache-uri _) ('date date)
|
||
('value _))
|
||
(obsolete? date now %narinfo-ttl))
|
||
(_ #t)))))
|
||
(lambda args
|
||
;; FILE may have been deleted.
|
||
#t)))
|
||
|
||
(for-each (lambda (file)
|
||
(let ((file (string-append directory "/" file)))
|
||
(when (expired? file)
|
||
;; Wrap in `false-if-exception' because FILE might have been
|
||
;; deleted in the meantime (TOCTTOU).
|
||
(false-if-exception (delete-file file)))))
|
||
(scandir directory
|
||
(lambda (file)
|
||
(= (string-length file) 32)))))
|
||
|
||
(define (narinfo-cache-directories)
|
||
"Return the list of narinfo cache directories (one per cache URL.)"
|
||
(map (cut string-append %narinfo-cache-directory "/" <>)
|
||
(scandir %narinfo-cache-directory
|
||
(lambda (item)
|
||
(and (not (member item '("." "..")))
|
||
(file-is-directory?
|
||
(string-append %narinfo-cache-directory
|
||
"/" item)))))))
|
||
|
||
(define (maybe-remove-expired-cached-narinfo)
|
||
"Remove expired narinfo entries from the cache if deemed necessary."
|
||
(define now
|
||
(current-time time-monotonic))
|
||
|
||
(define expiry-file
|
||
(string-append %narinfo-cache-directory "/last-expiry-cleanup"))
|
||
|
||
(define last-expiry-date
|
||
(or (false-if-exception
|
||
(call-with-input-file expiry-file read))
|
||
0))
|
||
|
||
(when (obsolete? last-expiry-date now
|
||
%narinfo-expired-cache-entry-removal-delay)
|
||
(for-each remove-expired-cached-narinfos
|
||
(narinfo-cache-directories))
|
||
(call-with-output-file expiry-file
|
||
(cute write (time-second now) <>))))
|
||
|
||
(define (progress-report-port report-progress port)
|
||
"Return a port that calls REPORT-PROGRESS every time something is read from
|
||
PORT. REPORT-PROGRESS is a two-argument procedure such as that returned by
|
||
`progress-proc'."
|
||
(define total 0)
|
||
(define (read! bv start count)
|
||
(let ((n (match (get-bytevector-n! port bv start count)
|
||
((? eof-object?) 0)
|
||
(x x))))
|
||
(set! total (+ total n))
|
||
(report-progress total (const n))
|
||
;; XXX: We're not in control, so we always return anyway.
|
||
n))
|
||
|
||
(make-custom-binary-input-port "progress-port-proc"
|
||
read! #f #f
|
||
(cut close-port port)))
|
||
|
||
(define-syntax with-networking
|
||
(syntax-rules ()
|
||
"Catch DNS lookup errors and gracefully exit."
|
||
;; Note: no attempt is made to catch other networking errors, because DNS
|
||
;; lookup errors are typically the first one, and because other errors are
|
||
;; a subset of `system-error', which is harder to filter.
|
||
((_ exp ...)
|
||
(catch 'getaddrinfo-error
|
||
(lambda () exp ...)
|
||
(lambda (key error)
|
||
(leave (_ "host name lookup error: ~a~%")
|
||
(gai-strerror error)))))))
|
||
|
||
|
||
;;;
|
||
;;; Help.
|
||
;;;
|
||
|
||
(define (show-help)
|
||
(display (_ "Usage: guix substitute [OPTION]...
|
||
Internal tool to substitute a pre-built binary to a local build.\n"))
|
||
(display (_ "
|
||
--query report on the availability of substitutes for the
|
||
store file names passed on the standard input"))
|
||
(display (_ "
|
||
--substitute STORE-FILE DESTINATION
|
||
download STORE-FILE and store it as a Nar in file
|
||
DESTINATION"))
|
||
(newline)
|
||
(display (_ "
|
||
-h, --help display this help and exit"))
|
||
(display (_ "
|
||
-V, --version display version information and exit"))
|
||
(newline)
|
||
(show-bug-report-information))
|
||
|
||
|
||
|
||
;;;
|
||
;;; Daemon/substituter protocol.
|
||
;;;
|
||
|
||
(define (display-narinfo-data narinfo)
|
||
"Write to the current output port the contents of NARINFO is the format
|
||
expected by the daemon."
|
||
(format #t "~a\n~a\n~a\n"
|
||
(narinfo-path narinfo)
|
||
(or (and=> (narinfo-deriver narinfo)
|
||
(cute string-append (%store-prefix) "/" <>))
|
||
"")
|
||
(length (narinfo-references narinfo)))
|
||
(for-each (cute format #t "~a/~a~%" (%store-prefix) <>)
|
||
(narinfo-references narinfo))
|
||
(format #t "~a\n~a\n"
|
||
(or (narinfo-file-size narinfo) 0)
|
||
(or (narinfo-size narinfo) 0)))
|
||
|
||
(define* (process-query command
|
||
#:key cache-url acl)
|
||
"Reply to COMMAND, a query as written by the daemon to this process's
|
||
standard input. Use ACL as the access-control list against which to check
|
||
authorized substitutes."
|
||
(define (valid? obj)
|
||
(and (narinfo? obj) (valid-narinfo? obj acl)))
|
||
|
||
(match (string-tokenize command)
|
||
(("have" paths ..1)
|
||
;; Return the subset of PATHS available in CACHE-URL.
|
||
(let ((substitutable (lookup-narinfos cache-url paths)))
|
||
(for-each (lambda (narinfo)
|
||
(format #t "~a~%" (narinfo-path narinfo)))
|
||
(filter valid? substitutable))
|
||
(newline)))
|
||
(("info" paths ..1)
|
||
;; Reply info about PATHS if it's in CACHE-URL.
|
||
(let ((substitutable (lookup-narinfos cache-url paths)))
|
||
(for-each display-narinfo-data (filter valid? substitutable))
|
||
(newline)))
|
||
(wtf
|
||
(error "unknown `--query' command" wtf))))
|
||
|
||
(define* (process-substitution store-item destination
|
||
#:key cache-url acl)
|
||
"Substitute STORE-ITEM (a store file name) from CACHE-URL, and write it to
|
||
DESTINATION as a nar file. Verify the substitute against ACL."
|
||
(let* ((narinfo (lookup-narinfo cache-url store-item))
|
||
(uri (narinfo-uri narinfo)))
|
||
;; Make sure it is signed and everything.
|
||
(assert-valid-narinfo narinfo acl)
|
||
|
||
;; Tell the daemon what the expected hash of the Nar itself is.
|
||
(format #t "~a~%" (narinfo-hash narinfo))
|
||
|
||
(format (current-error-port) "downloading `~a'~:[~*~; (~,1f MiB installed)~]...~%"
|
||
store-item
|
||
|
||
;; Use the Nar size as an estimate of the installed size.
|
||
(narinfo-size narinfo)
|
||
(and=> (narinfo-size narinfo)
|
||
(cute / <> (expt 2. 20))))
|
||
(let*-values (((raw download-size)
|
||
;; Note that Hydra currently generates Nars on the fly
|
||
;; and doesn't specify a Content-Length, so
|
||
;; DOWNLOAD-SIZE is #f in practice.
|
||
(fetch uri #:buffered? #f #:timeout? #f))
|
||
((progress)
|
||
(let* ((comp (narinfo-compression narinfo))
|
||
(dl-size (or download-size
|
||
(and (equal? comp "none")
|
||
(narinfo-size narinfo))))
|
||
(progress (progress-proc (uri-abbreviation uri)
|
||
dl-size
|
||
(current-error-port))))
|
||
(progress-report-port progress raw)))
|
||
((input pids)
|
||
(decompressed-port (and=> (narinfo-compression narinfo)
|
||
string->symbol)
|
||
progress)))
|
||
;; Unpack the Nar at INPUT into DESTINATION.
|
||
(restore-file input destination)
|
||
|
||
;; Skip a line after what 'progress-proc' printed.
|
||
(newline (current-error-port))
|
||
|
||
(every (compose zero? cdr waitpid) pids))))
|
||
|
||
|
||
;;;
|
||
;;; Entry point.
|
||
;;;
|
||
|
||
(define (check-acl-initialized)
|
||
"Warn if the ACL is uninitialized."
|
||
(define (singleton? acl)
|
||
;; True if ACL contains just the user's public key.
|
||
(and (file-exists? %public-key-file)
|
||
(let ((key (call-with-input-file %public-key-file
|
||
(compose string->canonical-sexp
|
||
get-string-all))))
|
||
(match acl
|
||
((thing)
|
||
(equal? (canonical-sexp->string thing)
|
||
(canonical-sexp->string key)))
|
||
(_
|
||
#f)))))
|
||
|
||
(let ((acl (acl->public-keys (current-acl))))
|
||
(when (or (null? acl) (singleton? acl))
|
||
(warning (_ "ACL for archive imports seems to be uninitialized, \
|
||
substitutes may be unavailable\n")))))
|
||
|
||
(define (daemon-options)
|
||
"Return a list of name/value pairs denoting build daemon options."
|
||
(define %not-newline
|
||
(char-set-complement (char-set #\newline)))
|
||
|
||
(match (getenv "_NIX_OPTIONS")
|
||
(#f ;should not happen when called by the daemon
|
||
'())
|
||
(newline-separated
|
||
;; Here we get something of the form "OPTION1=VALUE1\nOPTION2=VALUE2\n".
|
||
(filter-map (lambda (option=value)
|
||
(match (string-index option=value #\=)
|
||
(#f ;invalid option setting
|
||
#f)
|
||
(equal-sign
|
||
(cons (string-take option=value equal-sign)
|
||
(string-drop option=value (+ 1 equal-sign))))))
|
||
(string-tokenize newline-separated %not-newline)))))
|
||
|
||
(define (find-daemon-option option)
|
||
"Return the value of build daemon option OPTION, or #f if it could not be
|
||
found."
|
||
(assoc-ref (daemon-options) option))
|
||
|
||
(define-syntax-rule (or* a b)
|
||
(let ((first a))
|
||
(if (or (not first) (string-null? first))
|
||
b
|
||
first)))
|
||
|
||
(define %cache-url
|
||
(match (and=> (or* (find-daemon-option "untrusted-substitute-urls") ;client
|
||
(find-daemon-option "substitute-urls")) ;admin
|
||
string-tokenize)
|
||
((url)
|
||
url)
|
||
((head tail ..1)
|
||
;; Currently we don't handle multiple substitute URLs.
|
||
(warning (_ "these substitute URLs will not be used:~{ ~a~}~%")
|
||
tail)
|
||
head)
|
||
(#f
|
||
;; This can only happen when this script is not invoked by the
|
||
;; daemon.
|
||
"http://hydra.gnu.org")))
|
||
|
||
(define (guix-substitute . args)
|
||
"Implement the build daemon's substituter protocol."
|
||
(mkdir-p %narinfo-cache-directory)
|
||
(maybe-remove-expired-cached-narinfo)
|
||
(check-acl-initialized)
|
||
|
||
;; Starting from commit 22144afa in Nix, we are allowed to bail out directly
|
||
;; when we know we cannot substitute, but we must emit a newline on stdout
|
||
;; when everything is alright.
|
||
(let ((uri (string->uri %cache-url)))
|
||
(case (uri-scheme uri)
|
||
((http)
|
||
;; Exit gracefully if there's no network access.
|
||
(let ((host (uri-host uri)))
|
||
(catch 'getaddrinfo-error
|
||
(lambda ()
|
||
(getaddrinfo host))
|
||
(lambda (key error)
|
||
(warning (_ "failed to look up host '~a' (~a), \
|
||
substituter disabled~%")
|
||
host (gai-strerror error))
|
||
(exit 0)))))
|
||
(else #t)))
|
||
|
||
;; Say hello (see above.)
|
||
(newline)
|
||
(force-output (current-output-port))
|
||
|
||
(with-networking
|
||
(with-error-handling ; for signature errors
|
||
(match args
|
||
(("--query")
|
||
(let ((acl (current-acl)))
|
||
(let loop ((command (read-line)))
|
||
(or (eof-object? command)
|
||
(begin
|
||
(process-query command
|
||
#:cache-url %cache-url
|
||
#:acl acl)
|
||
(loop (read-line)))))))
|
||
(("--substitute" store-path destination)
|
||
;; Download STORE-PATH and add store it as a Nar in file DESTINATION.
|
||
(process-substitution store-path destination
|
||
#:cache-url %cache-url
|
||
#:acl (current-acl)))
|
||
(("--version")
|
||
(show-version-and-exit "guix substitute"))
|
||
(("--help")
|
||
(show-help))
|
||
(opts
|
||
(leave (_ "~a: unrecognized options~%") opts))))))
|
||
|
||
;;; Local Variables:
|
||
;;; eval: (put 'with-timeout 'scheme-indent-function 1)
|
||
;;; End:
|
||
|
||
;;; substitute.scm ends here
|