317 lines
13 KiB
Scheme
317 lines
13 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2013 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 system dmd)
|
||
#:use-module (guix store)
|
||
#:use-module (guix packages)
|
||
#:use-module (guix derivations)
|
||
#:use-module (guix records)
|
||
#:use-module ((gnu packages base)
|
||
#:select (glibc-final))
|
||
#:use-module ((gnu packages admin)
|
||
#:select (mingetty inetutils shadow))
|
||
#:use-module ((gnu packages package-management)
|
||
#:select (guix))
|
||
#:use-module ((gnu packages linux)
|
||
#:select (net-tools))
|
||
#:use-module (gnu system shadow) ; for user accounts/groups
|
||
#:use-module (gnu system linux) ; for PAM services
|
||
#:use-module (ice-9 match)
|
||
#:use-module (ice-9 format)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-26)
|
||
#:use-module (guix monads)
|
||
#:export (service?
|
||
service
|
||
service-provision
|
||
service-requirement
|
||
service-respawn?
|
||
service-start
|
||
service-stop
|
||
service-inputs
|
||
service-user-accounts
|
||
service-user-groups
|
||
service-pam-services
|
||
|
||
host-name-service
|
||
syslog-service
|
||
mingetty-service
|
||
nscd-service
|
||
guix-service
|
||
static-networking-service
|
||
|
||
dmd-configuration-file))
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; System services as cajoled by dmd.
|
||
;;;
|
||
;;; Code:
|
||
|
||
(define-record-type* <service>
|
||
service make-service
|
||
service?
|
||
(documentation service-documentation ; string
|
||
(default "[No documentation.]"))
|
||
(provision service-provision) ; list of symbols
|
||
(requirement service-requirement ; list of symbols
|
||
(default '()))
|
||
(respawn? service-respawn? ; Boolean
|
||
(default #t))
|
||
(start service-start) ; expression
|
||
(stop service-stop ; expression
|
||
(default #f))
|
||
(inputs service-inputs ; list of inputs
|
||
(default '()))
|
||
(user-accounts service-user-accounts ; list of <user-account>
|
||
(default '()))
|
||
(user-groups service-user-groups ; list of <user-groups>
|
||
(default '()))
|
||
(pam-services service-pam-services ; list of <pam-service>
|
||
(default '())))
|
||
|
||
(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"))
|
||
(allow-empty-passwords? #t))
|
||
"Return a service to run mingetty on TTY."
|
||
(mlet %store-monad ((mingetty-bin (package-file mingetty "sbin/mingetty"))
|
||
(motd motd))
|
||
(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 '(host-name))
|
||
|
||
(start `(make-forkexec-constructor ,mingetty-bin "--noclear" ,tty))
|
||
(stop `(make-kill-destructor))
|
||
(inputs `(("mingetty" ,mingetty)
|
||
("motd" ,motd)))
|
||
|
||
(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)."
|
||
(mlet %store-monad ((nscd (package-file glibc "sbin/nscd")))
|
||
(return (service
|
||
(documentation "Run libc's name service cache daemon (nscd).")
|
||
(provision '(nscd))
|
||
(start `(make-forkexec-constructor ,nscd "-f" "/dev/null"
|
||
"--foreground"))
|
||
(stop `(make-kill-destructor))
|
||
|
||
(respawn? #f)
|
||
(inputs `(("glibc" ,glibc)))))))
|
||
|
||
(define (syslog-service)
|
||
"Return a service that runs 'syslogd' with reasonable default settings."
|
||
|
||
;; Snippet adapted from the GNU inetutils manual.
|
||
(define contents "
|
||
# Log all kernel 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;kern.*;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))
|
||
(syslogd (package-file inetutils "libexec/syslogd")))
|
||
(return
|
||
(service
|
||
(documentation "Run the syslog daemon (syslogd).")
|
||
(provision '(syslogd))
|
||
(start `(make-forkexec-constructor ,syslogd "--no-detach"
|
||
"--rcfile" ,syslog.conf))
|
||
(stop `(make-kill-destructor))
|
||
(inputs `(("inetutils" ,inetutils)
|
||
("syslog.conf" ,syslog.conf)))))))
|
||
|
||
(define* (guix-build-accounts count #:key
|
||
(first-uid 30001)
|
||
(gid 30000)
|
||
(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))
|
||
(password "!")
|
||
(uid (+ first-uid n -1))
|
||
(gid gid)
|
||
(comment (format #f "Guix Build User ~2d" n))
|
||
(home-directory "/var/empty")
|
||
(shell (package-file shadow "sbin/nologin"))
|
||
(inputs `(("shadow" ,shadow)))))
|
||
1+
|
||
1))))
|
||
|
||
(define* (guix-service #:key (guix guix) (builder-group "guixbuild")
|
||
(build-user-gid 30000) (build-accounts 10))
|
||
"Return a service that runs the build daemon from GUIX, and has
|
||
BUILD-ACCOUNTS user accounts available under BUILD-USER-GID."
|
||
(mlet %store-monad ((daemon (package-file guix "bin/guix-daemon"))
|
||
(accounts (guix-build-accounts build-accounts
|
||
#:gid build-user-gid)))
|
||
(return (service
|
||
(provision '(guix-daemon))
|
||
(start `(make-forkexec-constructor ,daemon
|
||
"--build-users-group"
|
||
,builder-group))
|
||
(stop `(make-kill-destructor))
|
||
(inputs `(("guix" ,guix)))
|
||
(user-accounts accounts)
|
||
(user-groups (list (user-group
|
||
(name builder-group)
|
||
(id build-user-gid)
|
||
(members (map user-account-name
|
||
user-accounts)))))))))
|
||
|
||
(define* (static-networking-service interface ip
|
||
#:key
|
||
gateway
|
||
(name-servers '())
|
||
(inetutils inetutils)
|
||
(net-tools net-tools))
|
||
"Return a service that starts INTERFACE with address IP. If GATEWAY is
|
||
true, it must be a string specifying the default network gateway."
|
||
|
||
;; TODO: Eventually we should do this using Guile's networking procedures,
|
||
;; like 'configure-qemu-networking' does, but the patch that does this is
|
||
;; not yet in stock Guile.
|
||
(mlet %store-monad ((ifconfig (package-file inetutils "bin/ifconfig"))
|
||
(route (package-file net-tools "sbin/route")))
|
||
(return
|
||
(service
|
||
(documentation
|
||
(string-append "Set up networking on the '" interface
|
||
"' interface using a static IP address."))
|
||
(provision '(networking))
|
||
(start `(lambda _
|
||
;; Return #t if successfully started.
|
||
(and (zero? (system* ,ifconfig ,interface ,ip "up"))
|
||
,(if gateway
|
||
`(zero? (system* ,route "add" "-net" "default"
|
||
"gw" ,gateway))
|
||
#t)
|
||
,(if (pair? name-servers)
|
||
`(call-with-output-file "/etc/resolv.conf"
|
||
(lambda (port)
|
||
(display
|
||
"# Generated by 'static-networking-service'.\n"
|
||
port)
|
||
(for-each (lambda (server)
|
||
(format port "nameserver ~a~%"
|
||
server))
|
||
',name-servers)))
|
||
#t))))
|
||
(stop `(lambda _
|
||
;; Return #f is successfully stopped.
|
||
(not (and (system* ,ifconfig ,interface "down")
|
||
(system* ,route "del" "-net" "default")))))
|
||
(respawn? #f)
|
||
(inputs `(("inetutils" ,inetutils)
|
||
,@(if gateway
|
||
`(("net-tools" ,net-tools))
|
||
'())))))))
|
||
|
||
|
||
(define (dmd-configuration-file services etc)
|
||
"Return the dmd configuration file for SERVICES, that initializes /etc from
|
||
ETC on startup."
|
||
(define config
|
||
`(begin
|
||
(use-modules (ice-9 ftw))
|
||
|
||
(register-services
|
||
,@(map (match-lambda
|
||
(($ <service> documentation provision requirement
|
||
respawn? start stop)
|
||
`(make <service>
|
||
#:docstring ,documentation
|
||
#:provides ',provision
|
||
#:requires ',requirement
|
||
#:respawn? ,respawn?
|
||
#:start ,start
|
||
#:stop ,stop)))
|
||
services))
|
||
|
||
;; /etc is a mixture of static and dynamic settings. Here is where we
|
||
;; initialize it from the static part.
|
||
(format #t "populating /etc from ~a...~%" ,etc)
|
||
(let ((rm-f (lambda (f)
|
||
(false-if-exception (delete-file f)))))
|
||
(rm-f "/etc/static")
|
||
(symlink ,etc "/etc/static")
|
||
(for-each (lambda (file)
|
||
;; TODO: Handle 'shadow' specially so that changed
|
||
;; password aren't lost.
|
||
(let ((target (string-append "/etc/" file))
|
||
(source (string-append "/etc/static/" file)))
|
||
(rm-f target)
|
||
(symlink source target)))
|
||
(scandir ,etc
|
||
(lambda (file)
|
||
(not (member file '("." ".."))))))
|
||
|
||
;; Prevent ETC from being GC'd.
|
||
(rm-f "/var/nix/gcroots/etc-directory")
|
||
(symlink ,etc "/var/nix/gcroots/etc-directory"))
|
||
|
||
(format #t "starting services...~%")
|
||
(for-each start ',(append-map service-provision services))))
|
||
|
||
(text-file "dmd.conf" (object->string config)))
|
||
|
||
;;; dmd.scm ends here
|