415 lines
17 KiB
Scheme
415 lines
17 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
|
;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
|
|
;;;
|
|
;;; This file is part of GNU Guix.
|
|
;;;
|
|
;;; GNU Guix is free software; you can redistribute it and/or modify it
|
|
;;; under the terms of the GNU General Public License as published by
|
|
;;; the Free Software Foundation; either version 3 of the License, or (at
|
|
;;; your option) any later version.
|
|
;;;
|
|
;;; GNU Guix is distributed in the hope that it will be useful, but
|
|
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;;; GNU General Public License for more details.
|
|
;;;
|
|
;;; You should have received a copy of the GNU General Public License
|
|
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
(define-module (gnu services base)
|
|
#:use-module ((guix store)
|
|
#:select (%store-prefix))
|
|
#:use-module (gnu services)
|
|
#:use-module (gnu system shadow) ; 'user-account', etc.
|
|
#:use-module (gnu system linux) ; 'pam-service', etc.
|
|
#:use-module (gnu packages admin)
|
|
#:use-module ((gnu packages base)
|
|
#:select (glibc-final))
|
|
#:use-module (gnu packages package-management)
|
|
#:use-module (guix gexp)
|
|
#:use-module (guix monads)
|
|
#:use-module (srfi srfi-1)
|
|
#:use-module (srfi srfi-26)
|
|
#:use-module (ice-9 format)
|
|
#:export (root-file-system-service
|
|
file-system-service
|
|
user-processes-service
|
|
host-name-service
|
|
mingetty-service
|
|
nscd-service
|
|
syslog-service
|
|
guix-service
|
|
%base-services))
|
|
|
|
;;; Commentary:
|
|
;;;
|
|
;;; Base system services---i.e., services that 99% of the users will want to
|
|
;;; use.
|
|
;;;
|
|
;;; Code:
|
|
|
|
(define (root-file-system-service)
|
|
"Return a service whose sole purpose is to re-mount read-only the root file
|
|
system upon shutdown (aka. cleanly \"umounting\" root.)
|
|
|
|
This service must be the root of the service dependency graph so that its
|
|
'stop' action is invoked when dmd is the only process left."
|
|
(with-monad %store-monad
|
|
(return
|
|
(service
|
|
(documentation "Take care of the root file system.")
|
|
(provision '(root-file-system))
|
|
(start #~(const #t))
|
|
(stop #~(lambda _
|
|
;; Return #f if successfully stopped.
|
|
(sync)
|
|
|
|
(call-with-blocked-asyncs
|
|
(lambda ()
|
|
(let ((null (%make-void-port "w")))
|
|
;; Close 'dmd.log'.
|
|
(display "closing log\n")
|
|
;; XXX: Ideally we'd use 'stop-logging', but that one
|
|
;; doesn't actually close the port as of dmd 0.1.
|
|
(close-port (@@ (dmd comm) log-output-port))
|
|
(set! (@@ (dmd comm) log-output-port) null)
|
|
|
|
;; Redirect the default output ports..
|
|
(set-current-output-port null)
|
|
(set-current-error-port null)
|
|
|
|
;; Close /dev/console.
|
|
(for-each close-fdes '(0 1 2))
|
|
|
|
;; At this point, there are no open files left, so the
|
|
;; root file system can be re-mounted read-only.
|
|
(mount #f "/" #f
|
|
(logior MS_REMOUNT MS_RDONLY)
|
|
#:update-mtab? #f)
|
|
|
|
#f)))))
|
|
(respawn? #f)))))
|
|
|
|
(define* (file-system-service device target type
|
|
#:key (check? #t) options (title 'any))
|
|
"Return a service that mounts DEVICE on TARGET as a file system TYPE with
|
|
OPTIONS. TITLE is a symbol specifying what kind of name DEVICE is: 'label for
|
|
a partition label, 'device for a device file name, or 'any. When CHECK? is
|
|
true, check the file system before mounting it."
|
|
(with-monad %store-monad
|
|
(return
|
|
(service
|
|
(provision (list (symbol-append 'file-system- (string->symbol target))))
|
|
(requirement '(root-file-system))
|
|
(documentation "Check, mount, and unmount the given file system.")
|
|
(start #~(lambda args
|
|
(let ((device (canonicalize-device-spec #$device '#$title)))
|
|
#$(if check?
|
|
#~(check-file-system device #$type)
|
|
#~#t)
|
|
(mount device #$target #$type 0 #$options))
|
|
#t))
|
|
(stop #~(lambda args
|
|
;; Normally there are no processes left at this point, so
|
|
;; TARGET can be safely unmounted.
|
|
(umount #$target)
|
|
#f))))))
|
|
|
|
(define %do-not-kill-file
|
|
;; Name of the file listing PIDs of processes that must survive when halting
|
|
;; the system. Typical example is user-space file systems.
|
|
"/etc/dmd/do-not-kill")
|
|
|
|
(define* (user-processes-service requirements #:key (grace-delay 2))
|
|
"Return the service that is responsible for terminating all the processes so
|
|
that the root file system can be re-mounted read-only, just before
|
|
rebooting/halting. Processes still running GRACE-DELAY seconds after SIGTERM
|
|
has been sent are terminated with SIGKILL.
|
|
|
|
The returned service will depend on 'root-file-system' and on all the services
|
|
listed in REQUIREMENTS.
|
|
|
|
All the services that spawn processes must depend on this one so that they are
|
|
stopped before 'kill' is called."
|
|
(with-monad %store-monad
|
|
(return (service
|
|
(documentation "When stopped, terminate all user processes.")
|
|
(provision '(user-processes))
|
|
(requirement (cons 'root-file-system requirements))
|
|
(start #~(const #t))
|
|
(stop #~(lambda _
|
|
(define (kill-except omit signal)
|
|
;; Kill all the processes with SIGNAL except those
|
|
;; listed in OMIT and the current process.
|
|
(let ((omit (cons (getpid) omit)))
|
|
(for-each (lambda (pid)
|
|
(unless (memv pid omit)
|
|
(false-if-exception
|
|
(kill pid signal))))
|
|
(processes))))
|
|
|
|
(define omitted-pids
|
|
;; List of PIDs that must not be killed.
|
|
(if (file-exists? #$%do-not-kill-file)
|
|
(map string->number
|
|
(call-with-input-file #$%do-not-kill-file
|
|
(compose string-tokenize
|
|
(@ (ice-9 rdelim) read-string))))
|
|
'()))
|
|
|
|
;; When this happens, all the processes have been
|
|
;; killed, including 'deco', so DMD-OUTPUT-PORT and
|
|
;; thus CURRENT-OUTPUT-PORT are dangling.
|
|
(call-with-output-file "/dev/console"
|
|
(lambda (port)
|
|
(display "sending all processes the TERM signal\n"
|
|
port)))
|
|
|
|
(if (null? omitted-pids)
|
|
(begin
|
|
;; Easy: terminate all of them.
|
|
(kill -1 SIGTERM)
|
|
(sleep #$grace-delay)
|
|
(kill -1 SIGKILL))
|
|
(begin
|
|
;; Kill them all except OMITTED-PIDS. XXX: We
|
|
;; would like to (kill -1 SIGSTOP) to get a fixed
|
|
;; list of processes, like 'killall5' does, but
|
|
;; that seems unreliable.
|
|
(kill-except omitted-pids SIGTERM)
|
|
(sleep #$grace-delay)
|
|
(kill-except omitted-pids SIGKILL)
|
|
(delete-file #$%do-not-kill-file)))
|
|
|
|
(display "all processes have been terminated\n")
|
|
#f))
|
|
(respawn? #f)))))
|
|
|
|
(define (host-name-service name)
|
|
"Return a service that sets the host name to NAME."
|
|
(with-monad %store-monad
|
|
(return (service
|
|
(documentation "Initialize the machine's host name.")
|
|
(provision '(host-name))
|
|
(start #~(lambda _
|
|
(sethostname #$name)))
|
|
(respawn? #f)))))
|
|
|
|
(define* (mingetty-service tty
|
|
#:key
|
|
(motd (text-file "motd" "Welcome.\n"))
|
|
auto-login
|
|
login-program
|
|
login-pause?
|
|
(allow-empty-passwords? #t))
|
|
"Return a service to run mingetty on @var{tty}.
|
|
|
|
When @var{allow-empty-passwords?} is true, allow empty log-in password. When
|
|
@var{auto-login} is true, it must be a user name under which to log-in
|
|
automatically. @var{login-pause?} can be set to @code{#t} in conjunction with
|
|
@var{auto-login}, in which case the user will have to press a key before the
|
|
login shell is launched.
|
|
|
|
When true, @var{login-program} is a gexp or a monadic gexp denoting the name
|
|
of the log-in program (the default is the @code{login} program from the Shadow
|
|
tool suite.)
|
|
|
|
@var{motd} is a monadic value containing a text file to use as
|
|
the \"message of the day\"."
|
|
(mlet %store-monad ((motd motd)
|
|
(login-program (cond ((gexp? login-program)
|
|
(return login-program))
|
|
((not login-program)
|
|
(return #f))
|
|
(else
|
|
login-program))))
|
|
(return
|
|
(service
|
|
(documentation (string-append "Run mingetty on " 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.
|
|
(requirement '(user-processes host-name))
|
|
|
|
(start #~(make-forkexec-constructor
|
|
(string-append #$mingetty "/sbin/mingetty")
|
|
"--noclear" #$tty
|
|
#$@(if auto-login
|
|
#~("--autologin" #$auto-login)
|
|
#~())
|
|
#$@(if login-program
|
|
#~("--loginprog" #$login-program)
|
|
#~())
|
|
#$@(if login-pause?
|
|
#~("--loginpause")
|
|
#~())))
|
|
(stop #~(make-kill-destructor))
|
|
|
|
(pam-services
|
|
;; Let 'login' be known to PAM. All the mingetty services will have
|
|
;; that PAM service, but that's fine because they're all identical and
|
|
;; duplicates are removed.
|
|
(list (unix-pam-service "login"
|
|
#:allow-empty-passwords? allow-empty-passwords?
|
|
#:motd motd)))))))
|
|
|
|
(define* (nscd-service #:key (glibc glibc-final))
|
|
"Return a service that runs libc's name service cache daemon (nscd)."
|
|
(with-monad %store-monad
|
|
(return (service
|
|
(documentation "Run libc's name service cache daemon (nscd).")
|
|
(provision '(nscd))
|
|
(requirement '(user-processes))
|
|
|
|
(activate #~(begin
|
|
(use-modules (guix build utils))
|
|
(mkdir-p "/var/run/nscd")))
|
|
|
|
(start
|
|
#~(make-forkexec-constructor (string-append #$glibc "/sbin/nscd")
|
|
"-f" "/dev/null"
|
|
"--foreground"))
|
|
(stop #~(make-kill-destructor))
|
|
|
|
(respawn? #f)))))
|
|
|
|
(define (syslog-service)
|
|
"Return a service that runs 'syslogd' with reasonable default settings."
|
|
|
|
;; Snippet adapted from the GNU inetutils manual.
|
|
(define contents "
|
|
# 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!
|
|
*.err;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
|
|
")
|
|
|
|
(mlet %store-monad
|
|
((syslog.conf (text-file "syslog.conf" contents)))
|
|
(return
|
|
(service
|
|
(documentation "Run the syslog daemon (syslogd).")
|
|
(provision '(syslogd))
|
|
(requirement '(user-processes))
|
|
(start
|
|
#~(make-forkexec-constructor (string-append #$inetutils
|
|
"/libexec/syslogd")
|
|
"--no-detach"
|
|
"--rcfile" #$syslog.conf))
|
|
(stop #~(make-kill-destructor))))))
|
|
|
|
(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."
|
|
(with-monad %store-monad
|
|
(return (unfold (cut > <> count)
|
|
(lambda (n)
|
|
(user-account
|
|
(name (format #f "guixbuilder~2,'0d" n))
|
|
(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))
|
|
|
|
(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 #$guix "/bin/guix")
|
|
"guix" "archive" "--authorize")
|
|
(exit 1)))
|
|
(else
|
|
(let ((status (cdr (waitpid pid))))
|
|
(unless (zero? status)
|
|
(format (current-error-port) "warning: \
|
|
failed to register hydra.gnu.org public key: ~a~%" status))))))))
|
|
|
|
(define* (guix-service #:key (guix guix) (builder-group "guixbuild")
|
|
(build-accounts 10) authorize-hydra-key?)
|
|
"Return a service that runs the build daemon from GUIX, and has
|
|
BUILD-ACCOUNTS user accounts available under BUILD-USER-GID.
|
|
|
|
When AUTHORIZE-HYDRA-KEY? is true, the hydra.gnu.org public key provided by
|
|
GUIX is authorized upon activation, meaning that substitutes from
|
|
hydra.gnu.org are used by default."
|
|
(define activate
|
|
;; Assume that the store has BUILDER-GROUP as its group. We could
|
|
;; otherwise call 'chown' here, but the problem is that on a COW unionfs,
|
|
;; chown leads to an entire copy of the tree, which is a bad idea.
|
|
|
|
;; Optionally authorize hydra.gnu.org's key.
|
|
(and authorize-hydra-key?
|
|
(hydra-key-authorization guix)))
|
|
|
|
(mlet %store-monad ((accounts (guix-build-accounts build-accounts
|
|
#:group builder-group)))
|
|
(return (service
|
|
(provision '(guix-daemon))
|
|
(requirement '(user-processes))
|
|
(start
|
|
#~(make-forkexec-constructor (string-append #$guix
|
|
"/bin/guix-daemon")
|
|
"--build-users-group"
|
|
#$builder-group))
|
|
(stop #~(make-kill-destructor))
|
|
(user-accounts accounts)
|
|
(user-groups (list (user-group
|
|
(name builder-group)
|
|
|
|
;; Use a fixed GID so that we can create the
|
|
;; store with the right owner.
|
|
(id 30000))))
|
|
(activate activate)))))
|
|
|
|
(define %base-services
|
|
;; Convenience variable holding the basic services.
|
|
(let ((motd (text-file "motd" "
|
|
This is the GNU operating system, welcome!\n\n")))
|
|
(list (mingetty-service "tty1" #:motd motd)
|
|
(mingetty-service "tty2" #:motd motd)
|
|
(mingetty-service "tty3" #:motd motd)
|
|
(mingetty-service "tty4" #:motd motd)
|
|
(mingetty-service "tty5" #:motd motd)
|
|
(mingetty-service "tty6" #:motd motd)
|
|
(syslog-service)
|
|
(guix-service)
|
|
(nscd-service))))
|
|
|
|
;;; base.scm ends here
|