0b72475301
* guix/scripts/offload.scm (guix-offload): Print a warning when 'zlib-support?' returns false.
689 lines
26 KiB
Scheme
689 lines
26 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 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 offload)
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#:use-module (ssh key)
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#:use-module (ssh auth)
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#:use-module (ssh session)
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#:use-module (ssh channel)
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#:use-module (ssh popen)
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#:use-module (ssh dist)
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#:use-module (ssh dist node)
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#:use-module (ssh version)
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#:use-module (guix config)
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#:use-module (guix records)
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#:use-module (guix store)
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#:use-module (guix derivations)
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#:use-module ((guix serialization)
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#:select (nar-error? nar-error-file))
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#:use-module (guix nar)
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#:use-module (guix utils)
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#:use-module ((guix build syscalls) #:select (fcntl-flock))
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#:use-module ((guix build utils) #:select (which mkdir-p))
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#:use-module (guix ui)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:use-module (ice-9 popen)
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#:use-module (ice-9 rdelim)
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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 format)
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#:use-module (ice-9 binary-ports)
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#:export (build-machine
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build-requirements
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guix-offload))
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;;; Commentary:
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;;;
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;;; Attempt to offload builds to the machines listed in
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;;; /etc/guix/machines.scm, transferring missing dependencies over SSH, and
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;;; retrieving the build output(s) over SSH upon success.
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;;;
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;;; This command should not be used directly; instead, it is called on-demand
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;;; by the daemon, unless it was started with '--no-build-hook' or a client
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;;; inhibited build hooks.
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;;;
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;;; Code:
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(define-record-type* <build-machine>
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build-machine make-build-machine
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build-machine?
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(name build-machine-name) ; string
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(port build-machine-port ; number
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(default 22))
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(system build-machine-system) ; string
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(user build-machine-user) ; string
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(private-key build-machine-private-key ; file name
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(default (user-openssh-private-key)))
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(host-key build-machine-host-key) ; string
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(daemon-socket build-machine-daemon-socket ; string
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(default "/var/guix/daemon-socket/socket"))
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(parallel-builds build-machine-parallel-builds ; number
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(default 1))
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(speed build-machine-speed ; inexact real
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(default 1.0))
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(features build-machine-features ; list of strings
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(default '())))
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(define-record-type* <build-requirements>
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build-requirements make-build-requirements
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build-requirements?
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(system build-requirements-system) ; string
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(features build-requirements-features ; list of strings
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(default '())))
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(define %machine-file
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;; File that lists machines available as build slaves.
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(string-append %config-directory "/machines.scm"))
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(define (user-openssh-private-key)
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"Return the user's default SSH private key, or #f if it could not be
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determined."
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(and=> (getenv "HOME")
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(cut string-append <> "/.ssh/id_rsa")))
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(define %user-module
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;; Module in which the machine description file is loaded.
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(let ((module (make-fresh-user-module)))
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(module-use! module (resolve-interface '(guix scripts offload)))
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module))
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(define* (build-machines #:optional (file %machine-file))
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"Read the list of build machines from FILE and return it."
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(catch #t
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(lambda ()
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;; Avoid ABI incompatibility with the <build-machine> record.
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(set! %fresh-auto-compile #t)
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(save-module-excursion
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(lambda ()
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(set-current-module %user-module)
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(primitive-load file))))
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(lambda args
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(match args
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(('system-error . rest)
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(let ((err (system-error-errno args)))
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;; Silently ignore missing file since this is a common case.
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(if (= ENOENT err)
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'()
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(leave (_ "failed to open machine file '~a': ~a~%")
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file (strerror err)))))
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(('syntax-error proc message properties form . rest)
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(let ((loc (source-properties->location properties)))
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(leave (_ "~a: ~a~%")
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(location->string loc) message)))
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(x
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(leave (_ "failed to load machine file '~a': ~s~%")
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file args))))))
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(define (host-key->type+key host-key)
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"Destructure HOST-KEY, an OpenSSH host key string, and return two values:
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its key type as a symbol, and the actual base64-encoded string."
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(define (type->symbol type)
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(and (string-prefix? "ssh-" type)
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(string->symbol (string-drop type 4))))
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(match (string-tokenize host-key)
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((type key _)
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(values (type->symbol type) key))
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((type key)
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(values (type->symbol type) key))))
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(define (private-key-from-file* file)
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"Like 'private-key-from-file', but raise an error that 'with-error-handling'
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can interpret meaningfully."
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(catch 'guile-ssh-error
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(lambda ()
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(private-key-from-file file))
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(lambda (key proc str . rest)
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(raise (condition
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(&message (message (format #f (_ "failed to load SSH \
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private key from '~a': ~a")
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file str))))))))
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(define (open-ssh-session machine)
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"Open an SSH session for MACHINE and return it. Throw an error on failure."
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(let ((private (private-key-from-file* (build-machine-private-key machine)))
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(public (public-key-from-file
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(string-append (build-machine-private-key machine)
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".pub")))
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(session (make-session #:user (build-machine-user machine)
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#:host (build-machine-name machine)
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#:port (build-machine-port machine)
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#:timeout 5 ;seconds
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;; #:log-verbosity 'protocol
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#:identity (build-machine-private-key machine)
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;; We need lightweight compression when
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;; exchanging full archives.
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#:compression "zlib"
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#:compression-level 3)))
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(connect! session)
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;; Authenticate the server. XXX: Guile-SSH 0.10.1 doesn't know about
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;; ed25519 keys and 'get-key-type' returns #f in that case.
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(let-values (((server) (get-server-public-key session))
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((type key) (host-key->type+key
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(build-machine-host-key machine))))
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(unless (and (or (not (get-key-type server))
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(eq? (get-key-type server) type))
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(string=? (public-key->string server) key))
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;; Key mismatch: something's wrong. XXX: It could be that the server
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;; provided its Ed25519 key when we where expecting its RSA key.
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(leave (_ "server at '~a' returned host key '~a' of type '~a' \
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instead of '~a' of type '~a'~%")
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(build-machine-name machine)
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(public-key->string server) (get-key-type server)
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key type)))
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(let ((auth (userauth-public-key! session private)))
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(unless (eq? 'success auth)
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(disconnect! session)
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(leave (_ "SSH public key authentication failed for '~a': ~a~%")
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(build-machine-name machine) (get-error session))))
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session))
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(define* (connect-to-remote-daemon session
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#:optional
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(socket-name "/var/guix/daemon-socket/socket"))
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"Connect to the remote build daemon listening on SOCKET-NAME over SESSION,
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an SSH session. Return a <nix-server> object."
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(define redirect
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;; Code run in SESSION to redirect the remote process' stdin/stdout to the
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;; daemon's socket, à la socat. The SSH protocol supports forwarding to
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;; Unix-domain sockets but libssh doesn't have an API for that, hence this
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;; hack.
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`(begin
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(use-modules (ice-9 match) (rnrs io ports))
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(let ((sock (socket AF_UNIX SOCK_STREAM 0))
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(stdin (current-input-port))
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(stdout (current-output-port)))
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(setvbuf stdin _IONBF)
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(setvbuf stdout _IONBF)
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(connect sock AF_UNIX ,socket-name)
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(let loop ()
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(match (select (list stdin sock) '() (list stdin stdout sock))
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((reads writes ())
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(when (memq stdin reads)
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(match (get-bytevector-some stdin)
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((? eof-object?)
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(primitive-exit 0))
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(bv
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(put-bytevector sock bv))))
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(when (memq sock reads)
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(match (get-bytevector-some sock)
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((? eof-object?)
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(primitive-exit 0))
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(bv
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(put-bytevector stdout bv))))
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(loop))
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(_
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(primitive-exit 1)))))))
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(let ((channel
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(open-remote-pipe* session OPEN_BOTH
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;; Sort-of shell-quote REDIRECT.
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"guile" "-c"
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(object->string
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(object->string redirect)))))
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(open-connection #:port channel)))
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;;;
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;;; Synchronization.
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;;;
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(define (lock-file file)
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"Wait and acquire an exclusive lock on FILE. Return an open port."
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(mkdir-p (dirname file))
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(let ((port (open-file file "w0")))
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(fcntl-flock port 'write-lock)
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port))
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(define (unlock-file lock)
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"Unlock LOCK."
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(fcntl-flock lock 'unlock)
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(close-port lock)
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#t)
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(define-syntax-rule (with-file-lock file exp ...)
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"Wait to acquire a lock on FILE and evaluate EXP in that context."
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(let ((port (lock-file file)))
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(dynamic-wind
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(lambda ()
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#t)
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(lambda ()
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exp ...)
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(lambda ()
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(unlock-file port)))))
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(define-syntax-rule (with-machine-lock machine hint exp ...)
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"Wait to acquire MACHINE's exclusive lock for HINT, and evaluate EXP in that
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context."
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(with-file-lock (machine-lock-file machine hint)
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exp ...))
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(define (machine-slot-file machine slot)
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"Return the file name of MACHINE's file for SLOT."
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;; For each machine we have a bunch of files representing each build slot.
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;; When choosing a build machine, we attempt to get an exclusive lock on one
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;; of these; if we fail, that means all the build slots are already taken.
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;; Inspired by Nix's build-remote.pl.
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(string-append (string-append %state-directory "/offload/"
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(build-machine-name machine)
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"/" (number->string slot))))
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(define (acquire-build-slot machine)
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"Attempt to acquire a build slot on MACHINE. Return the port representing
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the slot, or #f if none is available.
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This mechanism allows us to set a hard limit on the number of simultaneous
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connections allowed to MACHINE."
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(mkdir-p (dirname (machine-slot-file machine 0)))
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(with-machine-lock machine 'slots
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(any (lambda (slot)
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(let ((port (open-file (machine-slot-file machine slot)
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"w0")))
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(catch 'flock-error
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(lambda ()
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(fcntl-flock port 'write-lock #:wait? #f)
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;; Got it!
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(format (current-error-port)
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"process ~a acquired build slot '~a'~%"
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(getpid) (port-filename port))
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port)
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(lambda args
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;; PORT is already locked by another process.
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(close-port port)
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#f))))
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(iota (build-machine-parallel-builds machine)))))
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(define (release-build-slot slot)
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"Release SLOT, a build slot as returned as by 'acquire-build-slot'."
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(close-port slot))
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;;;
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;;; Offloading.
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;;;
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(define (build-log-port)
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"Return the default port where build logs should be sent. The default is
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file descriptor 4, which is open by the daemon before running the offload
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hook."
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(let ((port (fdopen 4 "w0")))
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;; Make sure file descriptor 4 isn't closed when PORT is GC'd.
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(set-port-revealed! port 1)
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port))
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(define* (transfer-and-offload drv machine
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#:key
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(inputs '())
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(outputs '())
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(max-silent-time 3600)
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build-timeout
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print-build-trace?)
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"Offload DRV to MACHINE. Prior to the actual offloading, transfer all of
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INPUTS to MACHINE; if building DRV succeeds, retrieve all of OUTPUTS from
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MACHINE."
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(define session
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(open-ssh-session machine))
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(define store
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(connect-to-remote-daemon session
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(build-machine-daemon-socket machine)))
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(set-build-options store
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#:print-build-trace print-build-trace?
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#:max-silent-time max-silent-time
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#:timeout build-timeout)
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;; Protect DRV from garbage collection.
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(add-temp-root store (derivation-file-name drv))
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(send-files (cons (derivation-file-name drv) inputs)
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store)
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(format (current-error-port) "offloading '~a' to '~a'...~%"
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(derivation-file-name drv) (build-machine-name machine))
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(format (current-error-port) "@ build-remote ~a ~a~%"
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(derivation-file-name drv) (build-machine-name machine))
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(guard (c ((nix-protocol-error? c)
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(format (current-error-port)
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(_ "derivation '~a' offloaded to '~a' failed: ~a~%")
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(derivation-file-name drv)
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(build-machine-name machine)
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(nix-protocol-error-message c))
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;; Use exit code 100 for a permanent build failure. The daemon
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;; interprets other non-zero codes as transient build failures.
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(primitive-exit 100)))
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(build-derivations store (list drv)))
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(retrieve-files outputs store)
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(format (current-error-port) "done with offloaded '~a'~%"
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(derivation-file-name drv)))
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(define (store-import-channel session)
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"Return an output port to which archives to be exported to SESSION's store
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can be written."
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;; Using the 'import-paths' RPC on a remote store would be slow because it
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;; makes a round trip every time 32 KiB have been transferred. This
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;; procedure instead opens a separate channel to use the remote
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;; 'import-paths' procedure, which consumes all the data in a single round
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;; trip.
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(define import
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`(begin
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(use-modules (guix))
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(with-store store
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(setvbuf (current-input-port) _IONBF)
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(import-paths store (current-input-port)))))
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(open-remote-output-pipe session
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(string-join
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`("guile" "-c"
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,(object->string
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(object->string import))))))
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(define (store-export-channel session files)
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"Return an input port from which an export of FILES from SESSION's store can
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be read."
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;; Same as above: this is more efficient than calling 'export-paths' on a
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;; remote store.
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(define export
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`(begin
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(use-modules (guix))
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(with-store store
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(setvbuf (current-output-port) _IONBF)
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(export-paths store ',files (current-output-port)))))
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(open-remote-input-pipe session
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(string-join
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`("guile" "-c"
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,(object->string
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(object->string export))))))
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(define (send-files files remote)
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"Send the subset of FILES that's missing to REMOTE, a remote store."
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(with-store store
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;; Compute the subset of FILES missing on SESSION and send them.
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(let* ((session (channel-get-session (nix-server-socket remote)))
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(node (make-node session))
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(missing (node-eval node
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`(begin
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(use-modules (guix)
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(srfi srfi-1) (srfi srfi-26))
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(with-store store
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(remove (cut valid-path? store <>)
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',files)))))
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(port (store-import-channel session)))
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(format #t (_ "sending ~a store files to '~a'...~%")
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(length missing) (session-get session 'host))
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;; Send MISSING in topological order.
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(export-paths store missing port)
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;; Tell the remote process that we're done. (In theory the
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;; end-of-archive mark of 'export-paths' would be enough, but in
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;; practice it's not.)
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(channel-send-eof port)
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;; Wait for completion of the remote process.
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(let ((result (zero? (channel-get-exit-status port))))
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(close-port port)
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result))))
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(define (retrieve-files files remote)
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"Retrieve FILES from SESSION's store, and import them."
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(let* ((session (channel-get-session (nix-server-socket remote)))
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(host (session-get session 'host))
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(port (store-export-channel session files)))
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(format #t (_ "retrieving ~a files from '~a'...~%")
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(length files) host)
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;; We cannot use the 'import-paths' RPC here because we already
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;; hold the locks for FILES.
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(let ((result (restore-file-set port
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#:log-port (current-error-port)
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#:lock? #f)))
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(close-port port)
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result)))
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;;;
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;;; Scheduling.
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;;;
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(define (machine-matches? machine requirements)
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"Return #t if MACHINE matches REQUIREMENTS."
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(and (string=? (build-requirements-system requirements)
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(build-machine-system machine))
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(lset<= string=?
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(build-requirements-features requirements)
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(build-machine-features machine))))
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(define (machine-load machine)
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"Return the load of MACHINE, divided by the number of parallel builds
|
||
allowed on MACHINE."
|
||
;; Note: This procedure is costly since it creates a new SSH session.
|
||
(let* ((session (open-ssh-session machine))
|
||
(pipe (open-remote-pipe* session OPEN_READ
|
||
"cat" "/proc/loadavg"))
|
||
(line (read-line pipe)))
|
||
(close-port pipe)
|
||
|
||
(if (eof-object? line)
|
||
+inf.0 ;MACHINE does not respond, so assume it is infinitely loaded
|
||
(match (string-tokenize line)
|
||
((one five fifteen . _)
|
||
(let* ((raw (string->number five))
|
||
(jobs (build-machine-parallel-builds machine))
|
||
(normalized (/ raw jobs)))
|
||
(format (current-error-port) "load on machine '~a' is ~s\
|
||
(normalized: ~s)~%"
|
||
(build-machine-name machine) raw normalized)
|
||
normalized))
|
||
(_
|
||
+inf.0))))) ;something's fishy about MACHINE, so avoid it
|
||
|
||
(define (machine-lock-file machine hint)
|
||
"Return the name of MACHINE's lock file for HINT."
|
||
(string-append %state-directory "/offload/"
|
||
(build-machine-name machine)
|
||
"." (symbol->string hint) ".lock"))
|
||
|
||
(define (machine-choice-lock-file)
|
||
"Return the name of the file used as a lock when choosing a build machine."
|
||
(string-append %state-directory "/offload/machine-choice.lock"))
|
||
|
||
|
||
(define %slots
|
||
;; List of acquired build slots (open ports).
|
||
'())
|
||
|
||
(define (choose-build-machine machines)
|
||
"Return the best machine among MACHINES, or #f."
|
||
|
||
;; Proceed like this:
|
||
;; 1. Acquire the global machine-choice lock.
|
||
;; 2. For all MACHINES, attempt to acquire a build slot, and filter out
|
||
;; those machines for which we failed.
|
||
;; 3. Choose the best machine among those that are left.
|
||
;; 4. Release the previously-acquired build slots of the other machines.
|
||
;; 5. Release the global machine-choice lock.
|
||
|
||
(with-file-lock (machine-choice-lock-file)
|
||
(define machines+slots+loads
|
||
(filter-map (lambda (machine)
|
||
;; Call 'machine-load' from here to make sure it is called
|
||
;; only once per machine (it is expensive).
|
||
(let ((slot (acquire-build-slot machine)))
|
||
(and slot
|
||
(list machine slot (machine-load machine)))))
|
||
machines))
|
||
|
||
(define (undecorate pred)
|
||
(lambda (a b)
|
||
(match a
|
||
((machine1 slot1 load1)
|
||
(match b
|
||
((machine2 slot2 load2)
|
||
(pred machine1 load1 machine2 load2)))))))
|
||
|
||
(define (machine-less-loaded-or-faster? m1 l1 m2 l2)
|
||
;; Return #t if M1 is either less loaded or faster than M2, with L1
|
||
;; being the load of M1 and L2 the load of M2. (This relation defines a
|
||
;; total order on machines.)
|
||
(> (/ (build-machine-speed m1) (+ 1 l1))
|
||
(/ (build-machine-speed m2) (+ 1 l2))))
|
||
|
||
(let loop ((machines+slots+loads
|
||
(sort machines+slots+loads
|
||
(undecorate machine-less-loaded-or-faster?))))
|
||
(match machines+slots+loads
|
||
(((best slot load) others ...)
|
||
;; Return the best machine unless it's already overloaded.
|
||
(if (< load 2.)
|
||
(match others
|
||
(((machines slots loads) ...)
|
||
;; Release slots from the uninteresting machines.
|
||
(for-each release-build-slot slots)
|
||
|
||
;; Prevent SLOT from being GC'd.
|
||
(set! %slots (cons slot %slots))
|
||
best))
|
||
(begin
|
||
;; BEST is overloaded, so try the next one.
|
||
(release-build-slot slot)
|
||
(loop others))))
|
||
(() #f)))))
|
||
|
||
(define* (process-request wants-local? system drv features
|
||
#:key
|
||
print-build-trace? (max-silent-time 3600)
|
||
build-timeout)
|
||
"Process a request to build DRV."
|
||
(let* ((local? (and wants-local? (string=? system (%current-system))))
|
||
(reqs (build-requirements
|
||
(system system)
|
||
(features features)))
|
||
(candidates (filter (cut machine-matches? <> reqs)
|
||
(build-machines))))
|
||
(match candidates
|
||
(()
|
||
;; We'll never be able to match REQS.
|
||
(display "# decline\n"))
|
||
((_ ...)
|
||
(let ((machine (choose-build-machine candidates)))
|
||
(if machine
|
||
(begin
|
||
;; Offload DRV to MACHINE.
|
||
(display "# accept\n")
|
||
(let ((inputs (string-tokenize (read-line)))
|
||
(outputs (string-tokenize (read-line))))
|
||
(transfer-and-offload drv machine
|
||
#:inputs inputs
|
||
#:outputs outputs
|
||
#:max-silent-time max-silent-time
|
||
#:build-timeout build-timeout
|
||
#:print-build-trace? print-build-trace?)))
|
||
|
||
;; Not now, all the machines are busy.
|
||
(display "# postpone\n")))))))
|
||
|
||
|
||
;;;
|
||
;;; Entry point.
|
||
;;;
|
||
|
||
(define (guix-offload . args)
|
||
(define request-line-rx
|
||
;; The request format. See 'tryBuildHook' method in build.cc.
|
||
(make-regexp "([01]) ([a-z0-9_-]+) (/[[:graph:]]+.drv) ([[:graph:]]*)"))
|
||
|
||
(define not-coma
|
||
(char-set-complement (char-set #\,)))
|
||
|
||
;; Make sure $HOME really corresponds to the current user. This is
|
||
;; necessary since lsh uses that to determine the location of the yarrow
|
||
;; seed file, and fails if it's owned by someone else.
|
||
(and=> (passwd:dir (getpw (getuid)))
|
||
(cut setenv "HOME" <>))
|
||
|
||
;; We rely on protocol-level compression from libssh to optimize large data
|
||
;; transfers. Warn if it's missing.
|
||
(unless (zlib-support?)
|
||
(warning (_ "Guile-SSH lacks zlib support"))
|
||
(warning (_ "data transfers will *not* be compressed!")))
|
||
|
||
(match args
|
||
((system max-silent-time print-build-trace? build-timeout)
|
||
(let ((max-silent-time (string->number max-silent-time))
|
||
(build-timeout (string->number build-timeout))
|
||
(print-build-trace? (string=? print-build-trace? "1")))
|
||
(parameterize ((%current-system system))
|
||
(let loop ((line (read-line)))
|
||
(unless (eof-object? line)
|
||
(cond ((regexp-exec request-line-rx line)
|
||
=>
|
||
(lambda (match)
|
||
(with-error-handling
|
||
(process-request (equal? (match:substring match 1) "1")
|
||
(match:substring match 2) ; system
|
||
(call-with-input-file
|
||
(match:substring match 3)
|
||
read-derivation)
|
||
(string-tokenize
|
||
(match:substring match 4) not-coma)
|
||
#:print-build-trace? print-build-trace?
|
||
#:max-silent-time max-silent-time
|
||
#:build-timeout build-timeout))))
|
||
(else
|
||
(leave (_ "invalid request line: ~s~%") line)))
|
||
(loop (read-line)))))))
|
||
(("--version")
|
||
(show-version-and-exit "guix offload"))
|
||
(("--help")
|
||
(format #t (_ "Usage: guix offload SYSTEM PRINT-BUILD-TRACE
|
||
Process build offload requests written on the standard input, possibly
|
||
offloading builds to the machines listed in '~a'.~%")
|
||
%machine-file)
|
||
(display (_ "
|
||
This tool is meant to be used internally by 'guix-daemon'.\n"))
|
||
(show-bug-report-information))
|
||
(x
|
||
(leave (_ "invalid arguments: ~{~s ~}~%") x))))
|
||
|
||
;;; Local Variables:
|
||
;;; eval: (put 'with-machine-lock 'scheme-indent-function 2)
|
||
;;; eval: (put 'with-file-lock 'scheme-indent-function 1)
|
||
;;; eval: (put 'with-error-to-port 'scheme-indent-function 1)
|
||
;;; End:
|
||
|
||
;;; offload.scm ends here
|