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-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013 Ludovic Courtès <[email protected]>
-;;;
-;;; 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
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