gnu: Introduce the (gnu services ...) modules.

* gnu/system/dmd.scm: Remove file.  Move contents to...
* gnu/services.scm, gnu/services/base.scm, gnu/services/dmd.scm,
  gnu/services/networking.scm, gnu/services/xorg.scm: ... here.  New
  files.
* gnu/system.scm, gnu/system/vm.scm: Adjust accordingly.
* guix/scripts/system.scm (%user-module): Likewise.
* doc/guix.texi (Using the Configuration System): Likewise.
  (Defining Services): Likewise.

2 files changed, 1 insertions, 471 deletions

diff --git a/gnu/system/dmd.scm b/gnu/system/dmd.scm
deleted file mode 100644
index c1ddec88d6..0000000000
--- a/gnu/system/dmd.scm
+++ /dev/null
@@ -1,470 +0,0 @@
-;;; 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 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 guile-final))
-  #:use-module ((gnu packages admin)
-                #:select (dmd mingetty inetutils shadow))
-  #:use-module ((gnu packages package-management)
-                #:select (guix))
-  #:use-module ((gnu packages linux)
-                #:select (net-tools))
-  #:use-module (gnu packages xorg)
-  #:use-module (gnu packages bash)
-  #:use-module (gnu packages gl)
-  #:use-module (gnu packages slim)
-  #:use-module (gnu packages ratpoison)
-
-  #: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
-            xorg-start-command
-            slim-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* (xorg-start-command #:key
-                             (guile guile-final)
-                             (xorg-server xorg-server))
-  "Return a derivation that builds a GUILE script to start the X server from
-XORG-SERVER.  Usually the X server is started by a login manager."
-
-  (define (xserver.conf)
-    (text-file* "xserver.conf" "
-Section \"Files\"
-  FontPath \"" font-adobe75dpi "/share/font/X11/75dpi\"
-  ModulePath \"" xf86-video-vesa "/lib/xorg/modules/drivers\"
-  ModulePath \"" xf86-input-mouse "/lib/xorg/modules/input\"
-  ModulePath \"" xf86-input-keyboard "/lib/xorg/modules/input\"
-  ModulePath \"" xorg-server "/lib/xorg/modules\"
-  ModulePath \"" xorg-server "/lib/xorg/modules/extensions\"
-  ModulePath \"" xorg-server "/lib/xorg/modules/multimedia\"
-EndSection
-
-Section \"ServerFlags\"
-  Option \"AllowMouseOpenFail\" \"on""
-EndSection
-
-Section \"Monitor\"
-  Identifier \"Monitor[0]\"
-EndSection
-
-Section \"InputClass\"
-  Identifier \"Generic keyboard\"
-  MatchIsKeyboard \"on\"
-  Option \"XkbRules\" \"base\"
-  Option \"XkbModel\" \"pc104\"
-EndSection
-
-Section \"ServerLayout\"
-  Identifier \"Layout\"
-  Screen \"Screen-vesa\"
-EndSection
-
-Section \"Device\"
-  Identifier \"Device-vesa\"
-  Driver \"vesa\"
-EndSection
-
-Section \"Screen\"
-  Identifier \"Screen-vesa\"
-  Device \"Device-vesa\"
-EndSection"))
-
-  (mlet %store-monad ((guile-bin   (package-file guile "bin/guile"))
-                      (xorg-bin    (package-file xorg-server "bin/X"))
-                      (dri         (package-file mesa "lib/dri"))
-                      (xkbcomp-bin (package-file xkbcomp "bin"))
-                      (xkb-dir     (package-file xkeyboard-config
-                                                 "share/X11/xkb"))
-                      (config      (xserver.conf)))
-    (define builder
-      ;; Write a small wrapper around the X server.
-      `(let ((out (assoc-ref %outputs "out")))
-         (call-with-output-file out
-           (lambda (port)
-             (format port "#!~a --no-auto-compile~%!#~%" ,guile-bin)
-             (write '(begin
-                       (setenv "XORG_DRI_DRIVER_PATH" ,dri)
-                       (setenv "XKB_BINDIR" ,xkbcomp-bin)
-
-                       (apply execl
-
-                              ,xorg-bin "-ac" "-logverbose" "-verbose"
-                              "-xkbdir" ,xkb-dir
-                              "-config" ,(derivation->output-path config)
-                              "-nolisten" "tcp" "-terminate"
-
-                              ;; Note: SLiM and other display managers add the
-                              ;; '-auth' flag by themselves.
-                              (cdr (command-line))))
-                    port)))
-         (chmod out #o555)
-         #t))
-
-    (mlet %store-monad ((inputs (lower-inputs
-                                 `(("xorg" ,xorg-server)
-                                   ("xkbcomp" ,xkbcomp)
-                                   ("xkeyboard-config" ,xkeyboard-config)
-                                   ("mesa" ,mesa)
-                                   ("guile" ,guile)
-                                   ("xorg.conf" ,config)))))
-      (derivation-expression "start-xorg" builder
-                             #:inputs inputs))))
-
-(define* (slim-service #:key (slim slim)
-                       (allow-empty-passwords? #t) auto-login?
-                       (default-user "")
-                       (xauth xauth) (dmd dmd) (bash bash)
-                       startx)
-  "Return a service that spawns the SLiM graphical login manager, which in
-turn start the X display server with STARTX, a command as returned by
-'xorg-start-command'.
-
-When ALLOW-EMPTY-PASSWORDS? is true, allow logins with an empty password.
-When AUTO-LOGIN? is true, log in automatically as DEFAULT-USER."
-  (define (slim.cfg)
-    ;; TODO: Run "bash -login ~/.xinitrc %session".
-    (mlet %store-monad ((startx (or startx (xorg-start-command))))
-      (text-file* "slim.cfg"  "
-default_path /run/current-system/bin
-default_xserver " startx "
-xserver_arguments :0 vt7
-xauth_path " xauth "/bin/xauth
-authfile /var/run/slim.auth
-
-# The login command.  '%session' is replaced by the chosen session name, one
-# of the names specified in the 'sessions' setting: 'wmaker', 'xfce', etc.
-login_cmd  exec " ratpoison "/bin/ratpoison
-
-halt_cmd " dmd "/sbin/halt
-reboot_cmd " dmd "/sbin/reboot
-" (if auto-login?
-      (string-append "auto_login yes\ndefault_user " default-user)
-      ""))))
-
-  (mlet %store-monad ((slim-bin (package-file slim "bin/slim"))
-                      (bash-bin (package-file bash "bin/bash"))
-                      (slim.cfg (slim.cfg)))
-    (return
-     (service
-      (documentation "Xorg display server")
-      (provision '(xorg-server))
-      (requirement '(host-name))
-      (start
-       ;; XXX: Work around the inability to specify env. vars. directly.
-       `(make-forkexec-constructor
-         ,bash-bin "-c"
-         ,(string-append "SLIM_CFGFILE=" (derivation->output-path slim.cfg)
-                         " " slim-bin
-                         " -nodaemon")))
-      (stop  `(make-kill-destructor))
-      (inputs `(("slim" ,slim)
-                ("slim.cfg" ,slim.cfg)
-                ("bash" ,bash)))
-      (respawn? #t)
-      (pam-services
-       ;; Tell PAM about 'slim'.
-       (list (unix-pam-service
-              "slim"
-              #:allow-empty-passwords? allow-empty-passwords?)))))))
-
-
-(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
diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm
index dea7d0599b..3c0ea8a351 100644
--- a/gnu/system/vm.scm
+++ b/gnu/system/vm.scm
@@ -44,8 +44,8 @@
   #:use-module (gnu system linux)
   #:use-module (gnu system linux-initrd)
   #:use-module (gnu system grub)
-  #:use-module (gnu system dmd)
   #:use-module (gnu system)
+  #:use-module (gnu services)
 
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-26)