330 lines
14 KiB
Scheme
330 lines
14 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014 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 (gnu services base)
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#:use-module (gnu services)
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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 packages admin)
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#:use-module ((gnu packages base)
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#:select (glibc-final))
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#:use-module (gnu packages package-management)
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#:use-module (guix gexp)
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#:use-module (guix monads)
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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 format)
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#:export (root-file-system-service
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file-system-service
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user-processes-service
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host-name-service
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mingetty-service
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nscd-service
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syslog-service
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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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(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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(with-monad %store-monad
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(return
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(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* (file-system-service device target type
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#:key (check? #t) options)
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"Return a service that mounts DEVICE on TARGET as a file system TYPE with
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OPTIONS. When CHECK? is true, check the file system before mounting it."
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(with-monad %store-monad
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(return
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(service
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(provision (list (symbol-append 'file-system- (string->symbol target))))
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(requirement '(root-file-system))
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(documentation "Check, mount, and unmount the given file system.")
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(start #~(lambda args
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#$(if check?
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#~(check-file-system #$device #$type)
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#~#t)
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(mount #$device #$target #$type 0 #$options)
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#t))
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(stop #~(lambda args
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;; Normally there are no processes left at this point, so
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;; TARGET can be safely unmounted.
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(umount #$target)
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#f))))))
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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 requirements #:key (grace-delay 2))
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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 services
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listed in REQUIREMENTS.
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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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(with-monad %store-monad
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(return (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 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
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;; listed 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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;; When this happens, all the processes have been
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;; killed, including 'deco', so DMD-OUTPUT-PORT and
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;; thus CURRENT-OUTPUT-PORT are dangling.
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(call-with-output-file "/dev/console"
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(lambda (port)
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(display "sending all processes the TERM signal\n"
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port)))
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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 #$grace-delay)
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(kill -1 SIGKILL))
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(begin
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;; Kill them all except OMITTED-PIDS. XXX: We
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;; would like to (kill -1 SIGSTOP) to get a fixed
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;; list of processes, like 'killall5' does, but
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;; that seems unreliable.
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(kill-except omitted-pids SIGTERM)
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(sleep #$grace-delay)
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(kill-except omitted-pids SIGKILL)
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(delete-file #$%do-not-kill-file)))
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(display "all processes have been terminated\n")
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#f))
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(respawn? #f)))))
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(define (host-name-service name)
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"Return a service that sets the host name to NAME."
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(with-monad %store-monad
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(return (service
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(documentation "Initialize the machine's host name.")
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(provision '(host-name))
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(start #~(lambda _
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(sethostname #$name)))
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(respawn? #f)))))
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(define* (mingetty-service tty
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#:key
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(motd (text-file "motd" "Welcome.\n"))
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(allow-empty-passwords? #t))
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"Return a service to run mingetty on TTY."
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(mlet %store-monad ((motd motd))
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(return
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(service
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(documentation (string-append "Run mingetty on " tty "."))
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(provision (list (symbol-append 'term- (string->symbol tty))))
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;; Since the login prompt shows the host name, wait for the 'host-name'
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;; service to be done.
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(requirement '(user-processes host-name))
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(start #~(make-forkexec-constructor
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(string-append #$mingetty "/sbin/mingetty")
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"--noclear" #$tty))
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(stop #~(make-kill-destructor))
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(pam-services
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;; Let 'login' be known to PAM. All the mingetty services will have
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;; that PAM service, but that's fine because they're all identical and
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;; duplicates are removed.
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(list (unix-pam-service "login"
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#:allow-empty-passwords? allow-empty-passwords?
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#:motd motd)))))))
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(define* (nscd-service #:key (glibc glibc-final))
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"Return a service that runs libc's name service cache daemon (nscd)."
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(with-monad %store-monad
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(return (service
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(documentation "Run libc's name service cache daemon (nscd).")
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(provision '(nscd))
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(requirement '(user-processes))
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(start
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#~(make-forkexec-constructor (string-append #$glibc "/sbin/nscd")
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"-f" "/dev/null"
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"--foreground"))
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(stop #~(make-kill-destructor))
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(respawn? #f)))))
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(define (syslog-service)
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"Return a service that runs 'syslogd' with reasonable default settings."
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;; Snippet adapted from the GNU inetutils manual.
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(define contents "
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# Log all kernel messages, authentication messages of
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# level notice or higher and anything of level err or
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# higher to the console.
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# Don't log private authentication messages!
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*.err;kern.*;auth.notice;authpriv.none /dev/console
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# Log anything (except mail) of level info or higher.
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# Don't log private authentication messages!
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*.info;mail.none;authpriv.none /var/log/messages
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# Same, in a different place.
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*.info;mail.none;authpriv.none /dev/tty12
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# The authpriv file has restricted access.
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authpriv.* /var/log/secure
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# Log all the mail messages in one place.
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mail.* /var/log/maillog
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")
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(mlet %store-monad
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((syslog.conf (text-file "syslog.conf" contents)))
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(return
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(service
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(documentation "Run the syslog daemon (syslogd).")
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(provision '(syslogd))
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(requirement '(user-processes))
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(start
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#~(make-forkexec-constructor (string-append #$inetutils
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"/libexec/syslogd")
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"--no-detach"
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"--rcfile" #$syslog.conf))
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(stop #~(make-kill-destructor))))))
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(define* (guix-build-accounts count #:key
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(group "guixbuild")
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(first-uid 30001)
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(shadow shadow))
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"Return a list of COUNT user accounts for Guix build users, with UIDs
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starting at FIRST-UID, and under GID."
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(with-monad %store-monad
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(return (unfold (cut > <> count)
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(lambda (n)
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(user-account
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(name (format #f "guixbuilder~2,'0d" n))
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(uid (+ first-uid n -1))
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(group group)
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(comment (format #f "Guix Build User ~2d" n))
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(home-directory "/var/empty")
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(shell #~(string-append #$shadow "/sbin/nologin"))))
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1+
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1))))
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(define* (guix-service #:key (guix guix) (builder-group "guixbuild")
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(build-accounts 10))
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"Return a service that runs the build daemon from GUIX, and has
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BUILD-ACCOUNTS user accounts available under BUILD-USER-GID."
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(mlet %store-monad ((accounts (guix-build-accounts build-accounts
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#:group builder-group)))
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(return (service
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(provision '(guix-daemon))
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(requirement '(user-processes))
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(start
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#~(make-forkexec-constructor (string-append #$guix
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"/bin/guix-daemon")
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"--build-users-group"
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#$builder-group))
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(stop #~(make-kill-destructor))
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(user-accounts accounts)
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(user-groups (list (user-group
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(name builder-group)
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(members (map user-account-name
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user-accounts)))))))))
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(define %base-services
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;; Convenience variable holding the basic services.
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(let ((motd (text-file "motd" "
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This is the GNU operating system, welcome!\n\n")))
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(list (mingetty-service "tty1" #:motd motd)
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(mingetty-service "tty2" #:motd motd)
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(mingetty-service "tty3" #:motd motd)
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(mingetty-service "tty4" #:motd motd)
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(mingetty-service "tty5" #:motd motd)
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(mingetty-service "tty6" #:motd motd)
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(syslog-service)
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(guix-service)
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(nscd-service))))
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;;; base.scm ends here
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