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+;;; 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 (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 monads)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-26)
+ #:use-module (ice-9 format)
+ #:export (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 (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 %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