1073 lines
43 KiB
Scheme
1073 lines
43 KiB
Scheme
;;; 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 © 2015 Alex Kost <alezost@gmail.com>
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;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services base)
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#:use-module (guix store)
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#:use-module (gnu services)
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#:use-module (gnu services dmd)
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#:use-module (gnu services networking)
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#:use-module (gnu system shadow) ; 'user-account', etc.
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#:use-module (gnu system linux) ; 'pam-service', etc.
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#:use-module (gnu system file-systems) ; 'file-system', etc.
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#:use-module (gnu packages admin)
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#:use-module ((gnu packages linux)
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#:select (eudev kbd e2fsprogs lvm2 fuse alsa-utils crda))
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#:use-module ((gnu packages base)
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#:select (canonical-package glibc))
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#:use-module (gnu packages package-management)
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#:use-module (gnu packages lsh)
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#:use-module (gnu packages lsof)
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#:use-module ((gnu build file-systems)
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#:select (mount-flags->bit-mask))
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#:use-module (guix gexp)
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#:use-module (guix records)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:export (root-file-system-service
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file-system-service
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user-unmount-service
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device-mapping-service
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swap-service
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user-processes-service
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host-name-service
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console-keymap-service
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console-font-service
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udev-service-type
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udev-service
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mingetty-configuration
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mingetty-configuration?
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mingetty-service
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%nscd-default-caches
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%nscd-default-configuration
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nscd-configuration
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nscd-configuration?
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nscd-cache
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nscd-cache?
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nscd-service-type
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nscd-service
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syslog-service
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guix-configuration
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guix-configuration?
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guix-service
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%base-services))
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;;; Commentary:
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;;;
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;;; Base system services---i.e., services that 99% of the users will want to
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;;; use.
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;;;
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;;; Code:
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;;;
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;;; File systems.
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;;;
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(define %root-file-system-dmd-service
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(dmd-service
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(documentation "Take care of the root file system.")
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(provision '(root-file-system))
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(start #~(const #t))
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(stop #~(lambda _
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;; Return #f if successfully stopped.
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(sync)
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(call-with-blocked-asyncs
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(lambda ()
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(let ((null (%make-void-port "w")))
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;; Close 'dmd.log'.
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(display "closing log\n")
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;; XXX: Ideally we'd use 'stop-logging', but that one
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;; doesn't actually close the port as of dmd 0.1.
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(close-port (@@ (dmd comm) log-output-port))
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(set! (@@ (dmd comm) log-output-port) null)
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;; Redirect the default output ports..
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(set-current-output-port null)
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(set-current-error-port null)
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;; Close /dev/console.
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(for-each close-fdes '(0 1 2))
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;; At this point, there are no open files left, so the
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;; root file system can be re-mounted read-only.
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(mount #f "/" #f
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(logior MS_REMOUNT MS_RDONLY)
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#:update-mtab? #f)
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#f)))))
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(respawn? #f)))
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(define root-file-system-service-type
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(dmd-service-type 'root-file-system
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(const %root-file-system-dmd-service)))
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(define (root-file-system-service)
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"Return a service whose sole purpose is to re-mount read-only the root file
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system upon shutdown (aka. cleanly \"umounting\" root.)
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This service must be the root of the service dependency graph so that its
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'stop' action is invoked when dmd is the only process left."
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(service root-file-system-service-type #f))
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(define (file-system->dmd-service-name file-system)
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"Return the symbol that denotes the service mounting and unmounting
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FILE-SYSTEM."
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(symbol-append 'file-system-
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(string->symbol (file-system-mount-point file-system))))
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(define file-system-service-type
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;; TODO(?): Make this an extensible service that takes <file-system> objects
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;; and returns a list of <dmd-service>.
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(dmd-service-type
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'file-system
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(lambda (file-system)
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(let ((target (file-system-mount-point file-system))
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(device (file-system-device file-system))
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(type (file-system-type file-system))
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(title (file-system-title file-system))
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(check? (file-system-check? file-system))
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(create? (file-system-create-mount-point? file-system))
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(dependencies (file-system-dependencies file-system)))
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(dmd-service
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(provision (list (file-system->dmd-service-name file-system)))
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(requirement `(root-file-system
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,@(map file-system->dmd-service-name dependencies)))
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(documentation "Check, mount, and unmount the given file system.")
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(start #~(lambda args
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;; FIXME: Use or factorize with 'mount-file-system'.
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(let ((device (canonicalize-device-spec #$device '#$title))
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(flags #$(mount-flags->bit-mask
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(file-system-flags file-system))))
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#$(if create?
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#~(mkdir-p #$target)
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#~#t)
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#$(if check?
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#~(begin
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;; Make sure fsck.ext2 & co. can be found.
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(setenv "PATH"
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(string-append
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#$e2fsprogs "/sbin:"
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"/run/current-system/profile/sbin:"
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(getenv "PATH")))
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(check-file-system device #$type))
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#~#t)
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(mount device #$target #$type flags
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#$(file-system-options file-system))
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;; For read-only bind mounts, an extra remount is needed,
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;; as per <http://lwn.net/Articles/281157/>, which still
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;; applies to Linux 4.0.
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(when (and (= MS_BIND (logand flags MS_BIND))
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(= MS_RDONLY (logand flags MS_RDONLY)))
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(mount device #$target #$type
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(logior MS_BIND MS_REMOUNT MS_RDONLY))))
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#t))
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(stop #~(lambda args
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;; Normally there are no processes left at this point, so
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;; TARGET can be safely unmounted.
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;; Make sure PID 1 doesn't keep TARGET busy.
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(chdir "/")
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(umount #$target)
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#f)))))))
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(define* (file-system-service file-system)
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"Return a service that mounts @var{file-system}, a @code{<file-system>}
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object."
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(service file-system-service-type file-system))
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(define user-unmount-service-type
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(dmd-service-type
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'user-file-systems
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(lambda (known-mount-points)
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(dmd-service
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(documentation "Unmount manually-mounted file systems.")
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(provision '(user-file-systems))
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(start #~(const #t))
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(stop #~(lambda args
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(define (known? mount-point)
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(member mount-point
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(cons* "/proc" "/sys" '#$known-mount-points)))
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;; Make sure we don't keep the user's mount points busy.
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(chdir "/")
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(for-each (lambda (mount-point)
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(format #t "unmounting '~a'...~%" mount-point)
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(catch 'system-error
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(lambda ()
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(umount mount-point))
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(lambda args
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(let ((errno (system-error-errno args)))
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(format #t "failed to unmount '~a': ~a~%"
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mount-point (strerror errno))))))
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(filter (negate known?) (mount-points)))
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#f))))))
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(define (user-unmount-service known-mount-points)
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"Return a service whose sole purpose is to unmount file systems not listed
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in KNOWN-MOUNT-POINTS when it is stopped."
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(service user-unmount-service-type known-mount-points))
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(define %do-not-kill-file
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;; Name of the file listing PIDs of processes that must survive when halting
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;; the system. Typical example is user-space file systems.
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"/etc/dmd/do-not-kill")
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(define user-processes-service-type
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(dmd-service-type
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'user-processes
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(match-lambda
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((requirements grace-delay)
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||
(dmd-service
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||
(documentation "When stopped, terminate all user processes.")
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(provision '(user-processes))
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(requirement (cons* 'root-file-system 'user-file-systems
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(map file-system->dmd-service-name
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requirements)))
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(start #~(const #t))
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||
(stop #~(lambda _
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||
(define (kill-except omit signal)
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;; Kill all the processes with SIGNAL except those listed
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;; in OMIT and the current process.
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(let ((omit (cons (getpid) omit)))
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(for-each (lambda (pid)
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(unless (memv pid omit)
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(false-if-exception
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(kill pid signal))))
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(processes))))
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(define omitted-pids
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;; List of PIDs that must not be killed.
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(if (file-exists? #$%do-not-kill-file)
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(map string->number
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(call-with-input-file #$%do-not-kill-file
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(compose string-tokenize
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(@ (ice-9 rdelim) read-string))))
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'()))
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(define (now)
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(car (gettimeofday)))
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(define (sleep* n)
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;; Really sleep N seconds.
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;; Work around <http://bugs.gnu.org/19581>.
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(define start (now))
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(let loop ((elapsed 0))
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(when (> n elapsed)
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(sleep (- n elapsed))
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(loop (- (now) start)))))
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(define lset= (@ (srfi srfi-1) lset=))
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(display "sending all processes the TERM signal\n")
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(if (null? omitted-pids)
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(begin
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||
;; Easy: terminate all of them.
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(kill -1 SIGTERM)
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(sleep* #$grace-delay)
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(kill -1 SIGKILL))
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||
(begin
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||
;; Kill them all except OMITTED-PIDS. XXX: We would
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;; like to (kill -1 SIGSTOP) to get a fixed list of
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;; processes, like 'killall5' does, but that seems
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;; unreliable.
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(kill-except omitted-pids SIGTERM)
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(sleep* #$grace-delay)
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(kill-except omitted-pids SIGKILL)
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(delete-file #$%do-not-kill-file)))
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||
(let wait ()
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(let ((pids (processes)))
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(unless (lset= = pids (cons 1 omitted-pids))
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||
(format #t "waiting for process termination\
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(processes left: ~s)~%"
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pids)
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(sleep* 2)
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||
(wait))))
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||
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(display "all processes have been terminated\n")
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#f))
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(respawn? #f))))))
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(define* (user-processes-service file-systems #:key (grace-delay 4))
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"Return the service that is responsible for terminating all the processes so
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that the root file system can be re-mounted read-only, just before
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rebooting/halting. Processes still running GRACE-DELAY seconds after SIGTERM
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has been sent are terminated with SIGKILL.
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The returned service will depend on 'root-file-system' and on all the dmd
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services corresponding to FILE-SYSTEMS.
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All the services that spawn processes must depend on this one so that they are
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stopped before 'kill' is called."
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(service user-processes-service-type
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(list file-systems grace-delay)))
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|
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|
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;;;
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;;; Console & co.
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;;;
|
||
|
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(define host-name-service-type
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(dmd-service-type
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'host-name
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||
(lambda (name)
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||
(dmd-service
|
||
(documentation "Initialize the machine's host name.")
|
||
(provision '(host-name))
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||
(start #~(lambda _
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(sethostname #$name)))
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(respawn? #f)))))
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(define (host-name-service name)
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"Return a service that sets the host name to @var{name}."
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(service host-name-service-type name))
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||
|
||
(define (unicode-start tty)
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"Return a gexp to start Unicode support on @var{tty}."
|
||
|
||
;; We have to run 'unicode_start' in a pipe so that when it invokes the
|
||
;; 'tty' command, that command returns TTY.
|
||
#~(begin
|
||
(let ((pid (primitive-fork)))
|
||
(case pid
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||
((0)
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||
(close-fdes 0)
|
||
(dup2 (open-fdes #$tty O_RDONLY) 0)
|
||
(close-fdes 1)
|
||
(dup2 (open-fdes #$tty O_WRONLY) 1)
|
||
(execl (string-append #$kbd "/bin/unicode_start")
|
||
"unicode_start"))
|
||
(else
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(zero? (cdr (waitpid pid))))))))
|
||
|
||
(define console-keymap-service-type
|
||
(dmd-service-type
|
||
'console-keymap
|
||
(lambda (file)
|
||
(dmd-service
|
||
(documentation (string-append "Load console keymap (loadkeys)."))
|
||
(provision '(console-keymap))
|
||
(start #~(lambda _
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||
(zero? (system* (string-append #$kbd "/bin/loadkeys")
|
||
#$file))))
|
||
(respawn? #f)))))
|
||
|
||
(define (console-keymap-service file)
|
||
"Return a service to load console keymap from @var{file}."
|
||
(service console-keymap-service-type file))
|
||
|
||
(define console-font-service-type
|
||
(dmd-service-type
|
||
'console-font
|
||
(match-lambda
|
||
((tty font)
|
||
(let ((device (string-append "/dev/" tty)))
|
||
(dmd-service
|
||
(documentation "Load a Unicode console font.")
|
||
(provision (list (symbol-append 'console-font-
|
||
(string->symbol tty))))
|
||
|
||
;; Start after mingetty has been started on TTY, otherwise the settings
|
||
;; are ignored.
|
||
(requirement (list (symbol-append 'term-
|
||
(string->symbol tty))))
|
||
|
||
(start #~(lambda _
|
||
(and #$(unicode-start device)
|
||
(zero?
|
||
(system* (string-append #$kbd "/bin/setfont")
|
||
"-C" #$device #$font)))))
|
||
(stop #~(const #t))
|
||
(respawn? #f)))))))
|
||
|
||
(define* (console-font-service tty #:optional (font "LatGrkCyr-8x16"))
|
||
"Return a service that sets up Unicode support in @var{tty} and loads
|
||
@var{font} for that tty (fonts are per virtual console in Linux.)"
|
||
;; Note: 'LatGrkCyr-8x16' has the advantage of providing three common
|
||
;; scripts as well as glyphs for em dash, quotation marks, and other Unicode
|
||
;; codepoints notably found in the UTF-8 manual.
|
||
(service console-font-service-type (list tty font)))
|
||
|
||
(define-record-type* <mingetty-configuration>
|
||
mingetty-configuration make-mingetty-configuration
|
||
mingetty-configuration?
|
||
(mingetty mingetty-configuration-mingetty ;<package>
|
||
(default mingetty))
|
||
(tty mingetty-configuration-tty) ;string
|
||
(motd mingetty-configuration-motd ;file-like
|
||
(default (plain-file "motd" "Welcome.\n")))
|
||
(auto-login mingetty-auto-login ;string | #f
|
||
(default #f))
|
||
(login-program mingetty-login-program ;gexp
|
||
(default #f))
|
||
(login-pause? mingetty-login-pause? ;Boolean
|
||
(default #f))
|
||
|
||
;; Allow empty passwords by default so that first-time users can log in when
|
||
;; the 'root' account has just been created.
|
||
(allow-empty-passwords? mingetty-configuration-allow-empty-passwords?
|
||
(default #t))) ;Boolean
|
||
|
||
(define (mingetty-pam-service conf)
|
||
"Return the list of PAM service needed for CONF."
|
||
;; Let 'login' be known to PAM. All the mingetty services will have that
|
||
;; PAM service, but that's fine because they're all identical and duplicates
|
||
;; are removed.
|
||
(list (unix-pam-service "login"
|
||
#:allow-empty-passwords?
|
||
(mingetty-configuration-allow-empty-passwords? conf)
|
||
#:motd
|
||
(mingetty-configuration-motd conf))))
|
||
|
||
(define mingetty-dmd-service
|
||
(match-lambda
|
||
(($ <mingetty-configuration> mingetty tty motd auto-login login-program
|
||
login-pause? allow-empty-passwords?)
|
||
(list
|
||
(dmd-service
|
||
(documentation "Run mingetty on an tty.")
|
||
(provision (list (symbol-append 'term- (string->symbol tty))))
|
||
|
||
;; Since the login prompt shows the host name, wait for the 'host-name'
|
||
;; service to be done. Also wait for udev essentially so that the tty
|
||
;; text is not lost in the middle of kernel messages (XXX).
|
||
(requirement '(user-processes host-name udev))
|
||
|
||
(start #~(make-forkexec-constructor
|
||
(list (string-append #$mingetty "/sbin/mingetty")
|
||
"--noclear" #$tty
|
||
#$@(if auto-login
|
||
#~("--autologin" #$auto-login)
|
||
#~())
|
||
#$@(if login-program
|
||
#~("--loginprog" #$login-program)
|
||
#~())
|
||
#$@(if login-pause?
|
||
#~("--loginpause")
|
||
#~()))))
|
||
(stop #~(make-kill-destructor)))))))
|
||
|
||
(define mingetty-service-type
|
||
(service-type (name 'mingetty)
|
||
(extensions (list (service-extension dmd-root-service-type
|
||
mingetty-dmd-service)
|
||
(service-extension pam-root-service-type
|
||
mingetty-pam-service)))))
|
||
|
||
(define* (mingetty-service config)
|
||
"Return a service to run mingetty according to @var{config}, which specifies
|
||
the tty to run, among other things."
|
||
(service mingetty-service-type config))
|
||
|
||
(define-record-type* <nscd-configuration> nscd-configuration
|
||
make-nscd-configuration
|
||
nscd-configuration?
|
||
(log-file nscd-configuration-log-file ;string
|
||
(default "/var/log/nscd.log"))
|
||
(debug-level nscd-debug-level ;integer
|
||
(default 0))
|
||
;; TODO: See nscd.conf in glibc for other options to add.
|
||
(caches nscd-configuration-caches ;list of <nscd-cache>
|
||
(default %nscd-default-caches))
|
||
(name-services nscd-configuration-name-services ;list of <packages>
|
||
(default '()))
|
||
(glibc nscd-configuration-glibc ;<package>
|
||
(default (canonical-package glibc))))
|
||
|
||
(define-record-type* <nscd-cache> nscd-cache make-nscd-cache
|
||
nscd-cache?
|
||
(database nscd-cache-database) ;symbol
|
||
(positive-time-to-live nscd-cache-positive-time-to-live) ;integer
|
||
(negative-time-to-live nscd-cache-negative-time-to-live
|
||
(default 20)) ;integer
|
||
(suggested-size nscd-cache-suggested-size ;integer ("default module
|
||
;of hash table")
|
||
(default 211))
|
||
(check-files? nscd-cache-check-files? ;Boolean
|
||
(default #t))
|
||
(persistent? nscd-cache-persistent? ;Boolean
|
||
(default #t))
|
||
(shared? nscd-cache-shared? ;Boolean
|
||
(default #t))
|
||
(max-database-size nscd-cache-max-database-size ;integer
|
||
(default (* 32 (expt 2 20))))
|
||
(auto-propagate? nscd-cache-auto-propagate? ;Boolean
|
||
(default #t)))
|
||
|
||
(define %nscd-default-caches
|
||
;; Caches that we want to enable by default. Note that when providing an
|
||
;; empty nscd.conf, all caches are disabled.
|
||
(list (nscd-cache (database 'hosts)
|
||
|
||
;; Aggressively cache the host name cache to improve
|
||
;; privacy and resilience.
|
||
(positive-time-to-live (* 3600 12))
|
||
(negative-time-to-live 20)
|
||
(persistent? #t))
|
||
|
||
(nscd-cache (database 'services)
|
||
|
||
;; Services are unlikely to change, so we can be even more
|
||
;; aggressive.
|
||
(positive-time-to-live (* 3600 24))
|
||
(negative-time-to-live 3600)
|
||
(check-files? #t) ;check /etc/services changes
|
||
(persistent? #t))))
|
||
|
||
(define %nscd-default-configuration
|
||
;; Default nscd configuration.
|
||
(nscd-configuration))
|
||
|
||
(define (nscd.conf-file config)
|
||
"Return the @file{nscd.conf} configuration file for @var{config}, an
|
||
@code{<nscd-configuration>} object."
|
||
(define cache->config
|
||
(match-lambda
|
||
(($ <nscd-cache> (= symbol->string database)
|
||
positive-ttl negative-ttl size check-files?
|
||
persistent? shared? max-size propagate?)
|
||
(string-append "\nenable-cache\t" database "\tyes\n"
|
||
|
||
"positive-time-to-live\t" database "\t"
|
||
(number->string positive-ttl) "\n"
|
||
"negative-time-to-live\t" database "\t"
|
||
(number->string negative-ttl) "\n"
|
||
"suggested-size\t" database "\t"
|
||
(number->string size) "\n"
|
||
"check-files\t" database "\t"
|
||
(if check-files? "yes\n" "no\n")
|
||
"persistent\t" database "\t"
|
||
(if persistent? "yes\n" "no\n")
|
||
"shared\t" database "\t"
|
||
(if shared? "yes\n" "no\n")
|
||
"max-db-size\t" database "\t"
|
||
(number->string max-size) "\n"
|
||
"auto-propagate\t" database "\t"
|
||
(if propagate? "yes\n" "no\n")))))
|
||
|
||
(match config
|
||
(($ <nscd-configuration> log-file debug-level caches)
|
||
(plain-file "nscd.conf"
|
||
(string-append "\
|
||
# Configuration of libc's name service cache daemon (nscd).\n\n"
|
||
(if log-file
|
||
(string-append "logfile\t" log-file)
|
||
"")
|
||
"\n"
|
||
(if debug-level
|
||
(string-append "debug-level\t"
|
||
(number->string debug-level))
|
||
"")
|
||
"\n"
|
||
(string-concatenate
|
||
(map cache->config caches)))))))
|
||
|
||
(define (nscd-dmd-service config)
|
||
"Return a dmd service for CONFIG, an <nscd-configuration> object."
|
||
(let ((nscd.conf (nscd.conf-file config))
|
||
(name-services (nscd-configuration-name-services config)))
|
||
(list (dmd-service
|
||
(documentation "Run libc's name service cache daemon (nscd).")
|
||
(provision '(nscd))
|
||
(requirement '(user-processes))
|
||
(start #~(make-forkexec-constructor
|
||
(list (string-append #$(nscd-configuration-glibc config)
|
||
"/sbin/nscd")
|
||
"-f" #$nscd.conf "--foreground")
|
||
|
||
#:environment-variables
|
||
(list (string-append "LD_LIBRARY_PATH="
|
||
(string-join
|
||
(map (lambda (dir)
|
||
(string-append dir "/lib"))
|
||
(list #$@name-services))
|
||
":")))))
|
||
(stop #~(make-kill-destructor))
|
||
|
||
(respawn? #f)))))
|
||
|
||
(define nscd-activation
|
||
;; Actions to take before starting nscd.
|
||
#~(begin
|
||
(use-modules (guix build utils))
|
||
(mkdir-p "/var/run/nscd")
|
||
(mkdir-p "/var/db/nscd"))) ;for the persistent cache
|
||
|
||
(define nscd-service-type
|
||
(service-type (name 'nscd)
|
||
(extensions
|
||
(list (service-extension activation-service-type
|
||
(const nscd-activation))
|
||
(service-extension dmd-root-service-type
|
||
nscd-dmd-service)))
|
||
|
||
;; This can be extended by providing additional name services
|
||
;; such as nss-mdns.
|
||
(compose concatenate)
|
||
(extend (lambda (config name-services)
|
||
(nscd-configuration
|
||
(inherit config)
|
||
(name-services (append
|
||
(nscd-configuration-name-services config)
|
||
name-services)))))))
|
||
|
||
(define* (nscd-service #:optional (config %nscd-default-configuration))
|
||
"Return a service that runs libc's name service cache daemon (nscd) with the
|
||
given @var{config}---an @code{<nscd-configuration>} object. @xref{Name
|
||
Service Switch}, for an example."
|
||
(service nscd-service-type config))
|
||
|
||
(define syslog-service-type
|
||
(dmd-service-type
|
||
'syslog
|
||
(lambda (config-file)
|
||
(dmd-service
|
||
(documentation "Run the syslog daemon (syslogd).")
|
||
(provision '(syslogd))
|
||
(requirement '(user-processes))
|
||
(start #~(make-forkexec-constructor
|
||
(list (string-append #$inetutils "/libexec/syslogd")
|
||
"--no-detach" "--rcfile" #$config-file)))
|
||
(stop #~(make-kill-destructor))))))
|
||
|
||
;; Snippet adapted from the GNU inetutils manual.
|
||
(define %default-syslog.conf
|
||
(plain-file "syslog.conf" "
|
||
# Log all error messages, authentication messages of
|
||
# level notice or higher and anything of level err or
|
||
# higher to the console.
|
||
# Don't log private authentication messages!
|
||
*.alert;auth.notice;authpriv.none /dev/console
|
||
|
||
# Log anything (except mail) of level info or higher.
|
||
# Don't log private authentication messages!
|
||
*.info;mail.none;authpriv.none /var/log/messages
|
||
|
||
# Same, in a different place.
|
||
*.info;mail.none;authpriv.none /dev/tty12
|
||
|
||
# The authpriv file has restricted access.
|
||
authpriv.* /var/log/secure
|
||
|
||
# Log all the mail messages in one place.
|
||
mail.* /var/log/maillog
|
||
"))
|
||
|
||
(define* (syslog-service #:key (config-file %default-syslog.conf))
|
||
"Return a service that runs @code{syslogd}.
|
||
If configuration file name @var{config-file} is not specified, use some
|
||
reasonable default settings."
|
||
(service syslog-service-type config-file))
|
||
|
||
(define* (guix-build-accounts count #:key
|
||
(group "guixbuild")
|
||
(first-uid 30001)
|
||
(shadow shadow))
|
||
"Return a list of COUNT user accounts for Guix build users, with UIDs
|
||
starting at FIRST-UID, and under GID."
|
||
(unfold (cut > <> count)
|
||
(lambda (n)
|
||
(user-account
|
||
(name (format #f "guixbuilder~2,'0d" n))
|
||
(system? #t)
|
||
(uid (+ first-uid n -1))
|
||
(group group)
|
||
|
||
;; guix-daemon expects GROUP to be listed as a
|
||
;; supplementary group too:
|
||
;; <http://lists.gnu.org/archive/html/bug-guix/2013-01/msg00239.html>.
|
||
(supplementary-groups (list group "kvm"))
|
||
|
||
(comment (format #f "Guix Build User ~2d" n))
|
||
(home-directory "/var/empty")
|
||
(shell #~(string-append #$shadow "/sbin/nologin"))))
|
||
1+
|
||
1))
|
||
|
||
(define (hydra-key-authorization guix)
|
||
"Return a gexp with code to register the hydra.gnu.org public key with
|
||
GUIX."
|
||
#~(unless (file-exists? "/etc/guix/acl")
|
||
(let ((pid (primitive-fork)))
|
||
(case pid
|
||
((0)
|
||
(let* ((key (string-append #$guix
|
||
"/share/guix/hydra.gnu.org.pub"))
|
||
(port (open-file key "r0b")))
|
||
(format #t "registering public key '~a'...~%" key)
|
||
(close-port (current-input-port))
|
||
(dup port 0)
|
||
(execl (string-append #$guix "/bin/guix")
|
||
"guix" "archive" "--authorize")
|
||
(exit 1)))
|
||
(else
|
||
(let ((status (cdr (waitpid pid))))
|
||
(unless (zero? status)
|
||
(format (current-error-port) "warning: \
|
||
failed to register hydra.gnu.org public key: ~a~%" status))))))))
|
||
|
||
(define-record-type* <guix-configuration>
|
||
guix-configuration make-guix-configuration
|
||
guix-configuration?
|
||
(guix guix-configuration-guix ;<package>
|
||
(default guix))
|
||
(build-group guix-configuration-build-group ;string
|
||
(default "guixbuild"))
|
||
(build-accounts guix-configuration-build-accounts ;integer
|
||
(default 10))
|
||
(authorize-key? guix-configuration-authorize-key? ;Boolean
|
||
(default #t))
|
||
(use-substitutes? guix-configuration-use-substitutes? ;Boolean
|
||
(default #t))
|
||
(extra-options guix-configuration-extra-options ;list of strings
|
||
(default '()))
|
||
(lsof guix-configuration-lsof ;<package>
|
||
(default lsof))
|
||
(lsh guix-configuration-lsh ;<package>
|
||
(default lsh)))
|
||
|
||
(define %default-guix-configuration
|
||
(guix-configuration))
|
||
|
||
(define (guix-dmd-service config)
|
||
"Return a <dmd-service> for the Guix daemon service with CONFIG."
|
||
(match config
|
||
(($ <guix-configuration> guix build-group build-accounts authorize-key?
|
||
use-substitutes? extra-options lsof lsh)
|
||
(list (dmd-service
|
||
(documentation "Run the Guix daemon.")
|
||
(provision '(guix-daemon))
|
||
(requirement '(user-processes))
|
||
(start
|
||
#~(make-forkexec-constructor
|
||
(list (string-append #$guix "/bin/guix-daemon")
|
||
"--build-users-group" #$build-group
|
||
#$@(if use-substitutes?
|
||
'()
|
||
'("--no-substitutes"))
|
||
#$@extra-options)
|
||
|
||
;; Add 'lsof' (for the GC) and 'lsh' (for offloading) to the
|
||
;; daemon's $PATH.
|
||
#:environment-variables
|
||
(list (string-append "PATH=" #$lsof "/bin:" #$lsh "/bin"))))
|
||
(stop #~(make-kill-destructor)))))))
|
||
|
||
(define (guix-accounts config)
|
||
"Return the user accounts and user groups for CONFIG."
|
||
(match config
|
||
(($ <guix-configuration> _ build-group build-accounts)
|
||
(cons (user-group
|
||
(name build-group)
|
||
(system? #t)
|
||
|
||
;; Use a fixed GID so that we can create the store with the right
|
||
;; owner.
|
||
(id 30000))
|
||
(guix-build-accounts build-accounts
|
||
#:group build-group)))))
|
||
|
||
(define (guix-activation config)
|
||
"Return the activation gexp for CONFIG."
|
||
(match config
|
||
(($ <guix-configuration> guix build-group build-accounts authorize-key?)
|
||
;; Assume that the store has BUILD-GROUP as its group. We could
|
||
;; otherwise call 'chown' here, but the problem is that on a COW unionfs,
|
||
;; chown leads to an entire copy of the tree, which is a bad idea.
|
||
|
||
;; Optionally authorize hydra.gnu.org's key.
|
||
(and authorize-key?
|
||
(hydra-key-authorization guix)))))
|
||
|
||
(define guix-service-type
|
||
(service-type
|
||
(name 'guix)
|
||
(extensions
|
||
(list (service-extension dmd-root-service-type guix-dmd-service)
|
||
(service-extension account-service-type guix-accounts)
|
||
(service-extension activation-service-type guix-activation)))))
|
||
|
||
(define* (guix-service #:optional (config %default-guix-configuration))
|
||
"Return a service that runs the Guix build daemon according to
|
||
@var{config}."
|
||
(service guix-service-type config))
|
||
|
||
|
||
;;;
|
||
;;; Udev.
|
||
;;;
|
||
|
||
(define-record-type* <udev-configuration>
|
||
udev-configuration make-udev-configuration
|
||
udev-configuration?
|
||
(udev udev-configuration-udev ;<package>
|
||
(default udev))
|
||
(rules udev-configuration-rules ;list of <package>
|
||
(default '())))
|
||
|
||
(define (udev-rules-union packages)
|
||
"Return the union of the @code{lib/udev/rules.d} directories found in each
|
||
item of @var{packages}."
|
||
(define build
|
||
#~(begin
|
||
(use-modules (guix build union)
|
||
(guix build utils)
|
||
(srfi srfi-1)
|
||
(srfi srfi-26))
|
||
|
||
(define %standard-locations
|
||
'("/lib/udev/rules.d" "/libexec/udev/rules.d"))
|
||
|
||
(define (rules-sub-directory directory)
|
||
;; Return the sub-directory of DIRECTORY containing udev rules, or
|
||
;; #f if none was found.
|
||
(find directory-exists?
|
||
(map (cut string-append directory <>) %standard-locations)))
|
||
|
||
(mkdir-p (string-append #$output "/lib/udev"))
|
||
(union-build (string-append #$output "/lib/udev/rules.d")
|
||
(filter-map rules-sub-directory '#$packages))))
|
||
|
||
(computed-file "udev-rules" build
|
||
#:modules '((guix build union)
|
||
(guix build utils))))
|
||
|
||
(define* (kvm-udev-rule)
|
||
"Return a directory with a udev rule that changes the group of
|
||
@file{/dev/kvm} to \"kvm\" and makes it #o660."
|
||
;; Apparently QEMU-KVM used to ship this rule, but now we have to add it by
|
||
;; ourselves.
|
||
(computed-file "kvm-udev-rules"
|
||
#~(begin
|
||
(use-modules (guix build utils))
|
||
|
||
(define rules.d
|
||
(string-append #$output "/lib/udev/rules.d"))
|
||
|
||
(mkdir-p rules.d)
|
||
(call-with-output-file
|
||
(string-append rules.d "/90-kvm.rules")
|
||
(lambda (port)
|
||
;; Build users are part of the "kvm" group, so we
|
||
;; can fearlessly make /dev/kvm 660 (see
|
||
;; <http://bugs.gnu.org/18994>, for background.)
|
||
(display "\
|
||
KERNEL==\"kvm\", GROUP=\"kvm\", MODE=\"0660\"\n" port))))
|
||
#:modules '((guix build utils))))
|
||
|
||
(define udev-dmd-service
|
||
;; Return a <dmd-service> for UDEV with RULES.
|
||
(match-lambda
|
||
(($ <udev-configuration> udev rules)
|
||
(let* ((rules (udev-rules-union (cons* udev (kvm-udev-rule) rules)))
|
||
(udev.conf (computed-file "udev.conf"
|
||
#~(call-with-output-file #$output
|
||
(lambda (port)
|
||
(format port
|
||
"udev_rules=\"~a/lib/udev/rules.d\"\n"
|
||
#$rules))))))
|
||
(list
|
||
(dmd-service
|
||
(provision '(udev))
|
||
|
||
;; Udev needs /dev to be a 'devtmpfs' mount so that new device nodes can
|
||
;; be added: see
|
||
;; <http://www.linuxfromscratch.org/lfs/view/development/chapter07/udev.html>.
|
||
(requirement '(root-file-system))
|
||
|
||
(documentation "Populate the /dev directory, dynamically.")
|
||
(start #~(lambda ()
|
||
(define find
|
||
(@ (srfi srfi-1) find))
|
||
|
||
(define udevd
|
||
;; Choose the right 'udevd'.
|
||
(find file-exists?
|
||
(map (lambda (suffix)
|
||
(string-append #$udev suffix))
|
||
'("/libexec/udev/udevd" ;udev
|
||
"/sbin/udevd")))) ;eudev
|
||
|
||
(define (wait-for-udevd)
|
||
;; Wait until someone's listening on udevd's control
|
||
;; socket.
|
||
(let ((sock (socket AF_UNIX SOCK_SEQPACKET 0)))
|
||
(let try ()
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(connect sock PF_UNIX "/run/udev/control")
|
||
(close-port sock))
|
||
(lambda args
|
||
(format #t "waiting for udevd...~%")
|
||
(usleep 500000)
|
||
(try))))))
|
||
|
||
;; Allow udev to find the modules.
|
||
(setenv "LINUX_MODULE_DIRECTORY"
|
||
"/run/booted-system/kernel/lib/modules")
|
||
|
||
;; The first one is for udev, the second one for eudev.
|
||
(setenv "UDEV_CONFIG_FILE" #$udev.conf)
|
||
(setenv "EUDEV_RULES_DIRECTORY"
|
||
(string-append #$rules "/lib/udev/rules.d"))
|
||
|
||
(let ((pid (primitive-fork)))
|
||
(case pid
|
||
((0)
|
||
(exec-command (list udevd)))
|
||
(else
|
||
;; Wait until udevd is up and running. This
|
||
;; appears to be needed so that the events
|
||
;; triggered below are actually handled.
|
||
(wait-for-udevd)
|
||
|
||
;; Trigger device node creation.
|
||
(system* (string-append #$udev "/bin/udevadm")
|
||
"trigger" "--action=add")
|
||
|
||
;; Wait for things to settle down.
|
||
(system* (string-append #$udev "/bin/udevadm")
|
||
"settle")
|
||
pid)))))
|
||
(stop #~(make-kill-destructor))
|
||
|
||
;; When halting the system, 'udev' is actually killed by
|
||
;; 'user-processes', i.e., before its own 'stop' method was called.
|
||
;; Thus, make sure it is not respawned.
|
||
(respawn? #f)))))))
|
||
|
||
(define udev-service-type
|
||
(service-type (name 'udev)
|
||
(extensions
|
||
(list (service-extension dmd-root-service-type
|
||
udev-dmd-service)))
|
||
|
||
(compose concatenate) ;concatenate the list of rules
|
||
(extend (lambda (config rules)
|
||
(match config
|
||
(($ <udev-configuration> udev initial-rules)
|
||
(udev-configuration
|
||
(udev udev)
|
||
(rules (append initial-rules rules)))))))))
|
||
|
||
(define* (udev-service #:key (udev eudev) (rules '()))
|
||
"Run @var{udev}, which populates the @file{/dev} directory dynamically. Get
|
||
extra rules from the packages listed in @var{rules}."
|
||
(service udev-service-type
|
||
(udev-configuration (udev udev) (rules rules))))
|
||
|
||
(define device-mapping-service-type
|
||
(dmd-service-type
|
||
'device-mapping
|
||
(match-lambda
|
||
((target open close)
|
||
(dmd-service
|
||
(provision (list (symbol-append 'device-mapping- (string->symbol target))))
|
||
(requirement '(udev))
|
||
(documentation "Map a device node using Linux's device mapper.")
|
||
(start #~(lambda () #$open))
|
||
(stop #~(lambda _ (not #$close)))
|
||
(respawn? #f))))))
|
||
|
||
(define (device-mapping-service target open close)
|
||
"Return a service that maps device @var{target}, a string such as
|
||
@code{\"home\"} (meaning @code{/dev/mapper/home}). Evaluate @var{open}, a
|
||
gexp, to open it, and evaluate @var{close} to close it."
|
||
(service device-mapping-service-type
|
||
(list target open close)))
|
||
|
||
(define swap-service-type
|
||
(dmd-service-type
|
||
'swap
|
||
(lambda (device)
|
||
(define requirement
|
||
(if (string-prefix? "/dev/mapper/" device)
|
||
(list (symbol-append 'device-mapping-
|
||
(string->symbol (basename device))))
|
||
'()))
|
||
|
||
(dmd-service
|
||
(provision (list (symbol-append 'swap- (string->symbol device))))
|
||
(requirement `(udev ,@requirement))
|
||
(documentation "Enable the given swap device.")
|
||
(start #~(lambda ()
|
||
(restart-on-EINTR (swapon #$device))
|
||
#t))
|
||
(stop #~(lambda _
|
||
(restart-on-EINTR (swapoff #$device))
|
||
#f))
|
||
(respawn? #f)))))
|
||
|
||
(define (swap-service device)
|
||
"Return a service that uses @var{device} as a swap device."
|
||
(service swap-service-type device))
|
||
|
||
(define %base-services
|
||
;; Convenience variable holding the basic services.
|
||
(let ((motd (plain-file "motd" "
|
||
This is the GNU operating system, welcome!\n\n")))
|
||
(list (console-font-service "tty1")
|
||
(console-font-service "tty2")
|
||
(console-font-service "tty3")
|
||
(console-font-service "tty4")
|
||
(console-font-service "tty5")
|
||
(console-font-service "tty6")
|
||
|
||
(mingetty-service (mingetty-configuration
|
||
(tty "tty1") (motd motd)))
|
||
(mingetty-service (mingetty-configuration
|
||
(tty "tty2") (motd motd)))
|
||
(mingetty-service (mingetty-configuration
|
||
(tty "tty3") (motd motd)))
|
||
(mingetty-service (mingetty-configuration
|
||
(tty "tty4") (motd motd)))
|
||
(mingetty-service (mingetty-configuration
|
||
(tty "tty5") (motd motd)))
|
||
(mingetty-service (mingetty-configuration
|
||
(tty "tty6") (motd motd)))
|
||
|
||
(static-networking-service "lo" "127.0.0.1"
|
||
#:provision '(loopback))
|
||
(syslog-service)
|
||
(guix-service)
|
||
(nscd-service)
|
||
|
||
;; The LVM2 rules are needed as soon as LVM2 or the device-mapper is
|
||
;; used, so enable them by default. The FUSE and ALSA rules are
|
||
;; less critical, but handy.
|
||
(udev-service #:rules (list lvm2 fuse alsa-utils crda)))))
|
||
|
||
;;; base.scm ends here
|