590 lines
23 KiB
Scheme
590 lines
23 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015 David Thompson <davet@gnu.org>
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;;; Copyright © 2015, 2016 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 scripts publish)
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#:use-module ((system repl server) #:prefix repl:)
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#:use-module (ice-9 binary-ports)
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#:use-module (ice-9 format)
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#:use-module (ice-9 match)
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#:use-module (ice-9 regex)
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#:use-module (ice-9 rdelim)
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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-2)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-9 gnu)
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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-37)
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#:use-module (web http)
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#:use-module (web request)
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#:use-module (web response)
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#:use-module (web server)
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#:use-module (web uri)
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#:use-module (guix base32)
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#:use-module (guix base64)
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#:use-module (guix config)
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#:use-module (guix derivations)
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#:use-module (guix hash)
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#:use-module (guix pki)
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#:use-module (guix pk-crypto)
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#:use-module (guix store)
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#:use-module ((guix serialization) #:select (write-file))
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#:use-module (guix zlib)
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#:use-module (guix ui)
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#:use-module (guix scripts)
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#:use-module ((guix utils) #:select (compressed-file?))
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#:use-module ((guix build utils) #:select (dump-port))
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#:export (guix-publish))
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(define (show-help)
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(format #t (_ "Usage: guix publish [OPTION]...
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Publish ~a over HTTP.\n") %store-directory)
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(display (_ "
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-p, --port=PORT listen on PORT"))
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(display (_ "
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--listen=HOST listen on the network interface for HOST"))
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(display (_ "
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-u, --user=USER change privileges to USER as soon as possible"))
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(display (_ "
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-C, --compression[=LEVEL]
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compress archives at LEVEL"))
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(display (_ "
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--ttl=TTL announce narinfos can be cached for TTL seconds"))
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(display (_ "
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-r, --repl[=PORT] spawn REPL server on PORT"))
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(newline)
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(display (_ "
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-h, --help display this help and exit"))
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(display (_ "
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-V, --version display version information and exit"))
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(newline)
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(show-bug-report-information))
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(define (getaddrinfo* host)
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"Like 'getaddrinfo', but properly report errors."
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(catch 'getaddrinfo-error
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(lambda ()
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(getaddrinfo host))
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(lambda (key error)
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(leave (_ "lookup of host '~a' failed: ~a~%")
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host (gai-strerror error)))))
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;; Nar compression parameters.
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(define-record-type <compression>
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(compression type level)
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compression?
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(type compression-type)
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(level compression-level))
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(define %no-compression
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(compression 'none 0))
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(define %default-gzip-compression
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;; Since we compress on the fly, default to fast compression.
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(compression 'gzip 3))
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(define %options
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(list (option '(#\h "help") #f #f
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(lambda _
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(show-help)
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(exit 0)))
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(option '(#\V "version") #f #f
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(lambda _
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(show-version-and-exit "guix publish")))
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(option '(#\u "user") #t #f
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(lambda (opt name arg result)
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(alist-cons 'user arg result)))
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(option '(#\p "port") #t #f
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(lambda (opt name arg result)
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(alist-cons 'port (string->number* arg) result)))
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(option '("listen") #t #f
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(lambda (opt name arg result)
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(match (getaddrinfo* arg)
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((info _ ...)
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(alist-cons 'address (addrinfo:addr info)
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result))
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(()
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(leave (_ "lookup of host '~a' returned nothing")
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name)))))
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(option '(#\C "compression") #f #t
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(lambda (opt name arg result)
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(match (if arg (string->number* arg) 3)
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(0
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(alist-cons 'compression %no-compression result))
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(level
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(if (zlib-available?)
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(alist-cons 'compression
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(compression 'gzip level)
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result)
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(begin
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(warning (_ "zlib support is missing; \
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compression disabled~%"))
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result))))))
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(option '("ttl") #t #f
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(lambda (opt name arg result)
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(let ((duration (string->duration arg)))
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(unless duration
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(leave (_ "~a: invalid duration~%") arg))
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(alist-cons 'narinfo-ttl (time-second duration)
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result))))
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(option '(#\r "repl") #f #t
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(lambda (opt name arg result)
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;; If port unspecified, use default Guile REPL port.
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(let ((port (and arg (string->number* arg))))
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(alist-cons 'repl (or port 37146) result))))))
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(define %default-options
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`((port . 8080)
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;; Default to fast & low compression.
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(compression . ,(if (zlib-available?)
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%default-gzip-compression
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%no-compression))
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(address . ,(make-socket-address AF_INET INADDR_ANY 0))
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(repl . #f)))
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(define (lazy-read-file-sexp file)
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"Return a promise to read the canonical sexp from FILE."
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(delay
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(call-with-input-file file
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(compose string->canonical-sexp
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read-string))))
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(define %private-key
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(lazy-read-file-sexp %private-key-file))
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(define %public-key
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(lazy-read-file-sexp %public-key-file))
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(define %nix-cache-info
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`(("StoreDir" . ,%store-directory)
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("WantMassQuery" . 0)
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("Priority" . 100)))
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(define (load-derivation file)
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"Read the derivation from FILE."
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(call-with-input-file file read-derivation))
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(define (signed-string s)
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"Sign the hash of the string S with the daemon's key."
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(let* ((public-key (force %public-key))
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(hash (bytevector->hash-data (sha256 (string->utf8 s))
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#:key-type (key-type public-key))))
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(signature-sexp hash (force %private-key) public-key)))
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(define base64-encode-string
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(compose base64-encode string->utf8))
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(define* (narinfo-string store store-path key
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#:key (compression %no-compression))
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"Generate a narinfo key/value string for STORE-PATH; an exception is raised
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if STORE-PATH is invalid. Produce a URL that corresponds to COMPRESSION. The
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narinfo is signed with KEY."
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(let* ((path-info (query-path-info store store-path))
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(compression (if (compressed-file? store-path)
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%no-compression
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compression))
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(url (encode-and-join-uri-path
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`("nar"
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,@(match compression
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(($ <compression> 'none)
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'())
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(($ <compression> type)
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(list (symbol->string type))))
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,(basename store-path))))
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(hash (bytevector->nix-base32-string
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(path-info-hash path-info)))
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(size (path-info-nar-size path-info))
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(references (string-join
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(map basename (path-info-references path-info))
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" "))
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(deriver (path-info-deriver path-info))
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(base-info (format #f
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"\
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StorePath: ~a
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URL: ~a
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Compression: ~a
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NarHash: sha256:~a
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NarSize: ~d
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References: ~a~%"
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store-path url
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(compression-type compression)
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hash size references))
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;; Do not render a "Deriver" or "System" line if we are rendering
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;; info for a derivation.
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(info (if (not deriver)
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base-info
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(catch 'system-error
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(lambda ()
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(let ((drv (load-derivation deriver)))
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(format #f "~aSystem: ~a~%Deriver: ~a~%"
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base-info (derivation-system drv)
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(basename deriver))))
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(lambda args
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;; DERIVER might be missing, but that's fine:
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;; it's only used for <substitutable> where it's
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;; optional. 'System' is currently unused.
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(if (= ENOENT (system-error-errno args))
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base-info
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(apply throw args))))))
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(signature (base64-encode-string
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(canonical-sexp->string (signed-string info)))))
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(format #f "~aSignature: 1;~a;~a~%" info (gethostname) signature)))
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(define (not-found request)
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"Render 404 response for REQUEST."
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(values (build-response #:code 404)
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(string-append "Resource not found: "
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(uri-path (request-uri request)))))
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(define (render-nix-cache-info)
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"Render server information."
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(values '((content-type . (text/plain)))
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(lambda (port)
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(for-each (match-lambda
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((key . value)
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(format port "~a: ~a~%" key value)))
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%nix-cache-info))))
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(define* (render-narinfo store request hash
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#:key ttl (compression %no-compression))
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"Render metadata for the store path corresponding to HASH. If TTL is true,
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advertise it as the maximum validity period (in seconds) via the
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'Cache-Control' header. This allows 'guix substitute' to cache it for an
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appropriate duration."
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(let ((store-path (hash-part->path store hash)))
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(if (string-null? store-path)
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(not-found request)
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(values `((content-type . (application/x-nix-narinfo))
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,@(if ttl
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`((cache-control (max-age . ,ttl)))
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'()))
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(cut display
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(narinfo-string store store-path (force %private-key)
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#:compression compression)
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<>)))))
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;; XXX: Declare the 'Guix-Compression' HTTP header, which is in fact for
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;; internal consumption: it allows us to pass the compression info to
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;; 'http-write', as part of the workaround to <http://bugs.gnu.org/21093>.
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(declare-header! "Guix-Nar-Compression"
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(lambda (str)
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(match (call-with-input-string str read)
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(('compression type level)
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(compression type level))))
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compression?
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(lambda (compression port)
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(match compression
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(($ <compression> type level)
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(write `(compression ,type ,level) port)))))
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(define* (render-nar store request store-item
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#:key (compression %no-compression))
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"Render archive of the store path corresponding to STORE-ITEM."
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(let ((store-path (string-append %store-directory "/" store-item)))
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;; The ISO-8859-1 charset *must* be used otherwise HTTP clients will
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;; interpret the byte stream as UTF-8 and arbitrarily change invalid byte
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;; sequences.
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(if (valid-path? store store-path)
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(values `((content-type . (application/x-nix-archive
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(charset . "ISO-8859-1")))
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(guix-nar-compression . ,compression))
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;; XXX: We're not returning the actual contents, deferring
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;; instead to 'http-write'. This is a hack to work around
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;; <http://bugs.gnu.org/21093>.
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store-path)
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(not-found request))))
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(define (render-content-addressed-file store request
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name algo hash)
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"Return the content of the result of the fixed-output derivation NAME that
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has the given HASH of type ALGO."
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;; TODO: Support other hash algorithms.
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(if (and (eq? algo 'sha256) (= 32 (bytevector-length hash)))
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(let ((item (fixed-output-path name hash
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#:hash-algo algo
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#:recursive? #f)))
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(if (valid-path? store item)
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(values `((content-type . (application/octet-stream
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(charset . "ISO-8859-1"))))
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;; XXX: We're not returning the actual contents, deferring
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;; instead to 'http-write'. This is a hack to work around
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;; <http://bugs.gnu.org/21093>.
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item)
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(not-found request)))
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(not-found request)))
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(define extract-narinfo-hash
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(let ((regexp (make-regexp "^([a-df-np-sv-z0-9]{32}).narinfo$")))
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(lambda (str)
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"Return the hash within the narinfo resource string STR, or false if STR
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is invalid."
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(and=> (regexp-exec regexp str)
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(cut match:substring <> 1)))))
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(define (get-request? request)
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"Return #t if REQUEST uses the GET method."
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(eq? (request-method request) 'GET))
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(define (request-path-components request)
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"Split the URI path of REQUEST into a list of component strings. For
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example: \"/foo/bar\" yields '(\"foo\" \"bar\")."
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(split-and-decode-uri-path (uri-path (request-uri request))))
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;;;
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;;; Server.
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;;;
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(define %http-write
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(@@ (web server http) http-write))
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(define (sans-content-length response)
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"Return RESPONSE without its 'content-length' header."
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(set-field response (response-headers)
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(alist-delete 'content-length
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(response-headers response)
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eq?)))
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(define-syntax-rule (swallow-EPIPE exp ...)
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"Swallow EPIPE errors raised by EXP..."
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(catch 'system-error
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(lambda ()
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exp ...)
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(lambda args
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(if (= EPIPE (system-error-errno args))
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(values)
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(apply throw args)))))
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(define-syntax-rule (swallow-zlib-error exp ...)
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"Swallow 'zlib-error' exceptions raised by EXP..."
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(catch 'zlib-error
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(lambda ()
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exp ...)
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(const #f)))
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(define (nar-response-port response)
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"Return a port on which to write the body of RESPONSE, the response of a
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/nar request, according to COMPRESSION."
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(match (assoc-ref (response-headers response) 'guix-nar-compression)
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(($ <compression> 'gzip level)
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;; Note: We cannot used chunked encoding here because
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;; 'make-gzip-output-port' wants a file port.
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(make-gzip-output-port (response-port response)
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#:level level
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#:buffer-size (* 64 1024)))
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(($ <compression> 'none)
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(response-port response))
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(#f
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(response-port response))))
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(define (http-write server client response body)
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"Write RESPONSE and BODY to CLIENT, possibly in a separate thread to avoid
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blocking."
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(match (response-content-type response)
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(('application/x-nix-archive . _)
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;; Sending the the whole archive can take time so do it in a separate
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;; thread so that the main thread can keep working in the meantime.
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(call-with-new-thread
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(lambda ()
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(let* ((response (write-response (sans-content-length response)
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client))
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(port (begin
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(force-output client)
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(nar-response-port response))))
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;; XXX: Given our ugly workaround for <http://bugs.gnu.org/21093> in
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;; 'render-nar', BODY here is just the file name of the store item.
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;; We call 'write-file' from here because we know that's the only
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;; way to avoid building the whole nar in memory, which could
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;; quickly become a real problem. As a bonus, we even do
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;; sendfile(2) directly from the store files to the socket.
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(swallow-zlib-error
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(swallow-EPIPE
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(write-file (utf8->string body) port)))
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(swallow-zlib-error
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(close-port port))
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(values)))))
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(('application/octet-stream . _)
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;; Send a raw file in a separate thread.
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(call-with-new-thread
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(lambda ()
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(catch 'system-error
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(lambda ()
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(call-with-input-file (utf8->string body)
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(lambda (input)
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(let* ((size (stat:size (stat input)))
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(headers (alist-cons 'content-length size
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(alist-delete 'content-length
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(response-headers response)
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eq?)))
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(response (write-response (set-field response
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(response-headers)
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headers)
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client))
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(output (response-port response)))
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(dump-port input output)
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(close-port output)
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(values)))))
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(lambda args
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;; If the file was GC'd behind our back, that's fine. Likewise if
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;; the client closes the connection.
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(unless (memv (system-error-errno args)
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(list ENOENT EPIPE ECONNRESET))
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(apply throw args))
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(values))))))
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(_
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;; Handle other responses sequentially.
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(%http-write server client response body))))
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(define-server-impl concurrent-http-server
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;; A variant of Guile's built-in HTTP server that offloads possibly long
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;; responses to a different thread.
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(@@ (web server http) http-open)
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(@@ (web server http) http-read)
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http-write
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(@@ (web server http) http-close))
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(define* (make-request-handler store
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#:key
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narinfo-ttl
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(compression %no-compression))
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(lambda (request body)
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(format #t "~a ~a~%"
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(request-method request)
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(uri-path (request-uri request)))
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(if (get-request? request) ;reject POST, PUT, etc.
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(match (request-path-components request)
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;; /nix-cache-info
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(("nix-cache-info")
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(render-nix-cache-info))
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;; /<hash>.narinfo
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(((= extract-narinfo-hash (? string? hash)))
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;; TODO: Register roots for HASH that will somehow remain for
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;; NARINFO-TTL.
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(render-narinfo store request hash
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#:ttl narinfo-ttl
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#:compression compression))
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;; Use different URLs depending on the compression type. This
|
||
;; guarantees that /nar URLs remain valid even when 'guix publish'
|
||
;; is restarted with different compression parameters.
|
||
|
||
;; /nar/<store-item>
|
||
(("nar" store-item)
|
||
(render-nar store request store-item
|
||
#:compression %no-compression))
|
||
;; /nar/gzip/<store-item>
|
||
(("nar" "gzip" store-item)
|
||
(if (zlib-available?)
|
||
(render-nar store request store-item
|
||
#:compression
|
||
(match compression
|
||
(($ <compression> 'gzip)
|
||
compression)
|
||
(_
|
||
%default-gzip-compression)))
|
||
(not-found request)))
|
||
|
||
;; /nar/file/NAME/sha256/HASH
|
||
(("file" name "sha256" hash)
|
||
(guard (c ((invalid-base32-character? c)
|
||
(not-found request)))
|
||
(let ((hash (nix-base32-string->bytevector hash)))
|
||
(render-content-addressed-file store request
|
||
name 'sha256 hash))))
|
||
(_ (not-found request)))
|
||
(not-found request))))
|
||
|
||
(define* (run-publish-server socket store
|
||
#:key (compression %no-compression) narinfo-ttl)
|
||
(run-server (make-request-handler store
|
||
#:narinfo-ttl narinfo-ttl
|
||
#:compression compression)
|
||
concurrent-http-server
|
||
`(#:socket ,socket)))
|
||
|
||
(define (open-server-socket address)
|
||
"Return a TCP socket bound to ADDRESS, a socket address."
|
||
(let ((sock (socket (sockaddr:fam address) SOCK_STREAM 0)))
|
||
(setsockopt sock SOL_SOCKET SO_REUSEADDR 1)
|
||
(bind sock address)
|
||
sock))
|
||
|
||
(define (gather-user-privileges user)
|
||
"Switch to the identity of USER, a user name."
|
||
(catch 'misc-error
|
||
(lambda ()
|
||
(let ((user (getpw user)))
|
||
(setgroups #())
|
||
(setgid (passwd:gid user))
|
||
(setuid (passwd:uid user))))
|
||
(lambda (key proc message args . rest)
|
||
(leave (_ "user '~a' not found: ~a~%")
|
||
user (apply format #f message args)))))
|
||
|
||
|
||
;;;
|
||
;;; Entry point.
|
||
;;;
|
||
|
||
(define (guix-publish . args)
|
||
(with-error-handling
|
||
(let* ((opts (args-fold* args %options
|
||
(lambda (opt name arg result)
|
||
(leave (_ "~A: unrecognized option~%") name))
|
||
(lambda (arg result)
|
||
(leave (_ "~A: extraneous argument~%") arg))
|
||
%default-options))
|
||
(user (assoc-ref opts 'user))
|
||
(port (assoc-ref opts 'port))
|
||
(ttl (assoc-ref opts 'narinfo-ttl))
|
||
(compression (assoc-ref opts 'compression))
|
||
(address (let ((addr (assoc-ref opts 'address)))
|
||
(make-socket-address (sockaddr:fam addr)
|
||
(sockaddr:addr addr)
|
||
port)))
|
||
(socket (open-server-socket address))
|
||
(repl-port (assoc-ref opts 'repl)))
|
||
;; Read the key right away so that (1) we fail early on if we can't
|
||
;; access them, and (2) we can then drop privileges.
|
||
(force %private-key)
|
||
(force %public-key)
|
||
|
||
(when user
|
||
;; Now that we've read the key material and opened the socket, we can
|
||
;; drop privileges.
|
||
(gather-user-privileges user))
|
||
|
||
(when (zero? (getuid))
|
||
(warning (_ "server running as root; \
|
||
consider using the '--user' option!~%")))
|
||
(format #t (_ "publishing ~a on ~a, port ~d~%")
|
||
%store-directory
|
||
(inet-ntop (sockaddr:fam address) (sockaddr:addr address))
|
||
(sockaddr:port address))
|
||
(when repl-port
|
||
(repl:spawn-server (repl:make-tcp-server-socket #:port repl-port)))
|
||
(with-store store
|
||
(run-publish-server socket store
|
||
#:compression compression
|
||
#:narinfo-ttl ttl)))))
|