guix/gnu/services/samba.scm

;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2022 Simon Streit <simon@netpanic.org>
;;;
;;; This file is part of GNU Guix.
;;;
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;;; under the terms of the GNU General Public License as published by
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;;; your option) any later version.
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
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;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu services samba)

  #:use-module (gnu packages)
  #:use-module (gnu packages base)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages samba)

  #:use-module (gnu services)
  #:use-module (gnu services configuration)
  #:use-module (gnu services shepherd)
  #:use-module (gnu services base)
  #:use-module (gnu system shadow)

  #:use-module (guix gexp)
  #:use-module (guix packages)
  #:use-module (guix modules)
  #:use-module (guix records)

  #:use-module (ice-9 format)
  #:use-module (ice-9 match)
  #:use-module (ice-9 textual-ports)
  #:use-module (srfi srfi-1)

  #:export (samba-service-type
            samba-configuration
            samba-smb-conf))

(define %smb-conf
  (plain-file "smb.conf" "[global]
    workgroup = WORKGROUP
    server string = Samba Server
    server role = standalone server
    log file = /var/log/samba/log.%m
    logging = file
"))

(define-record-type* <samba-configuration>
  samba-configuration
  make-samba-configuration
  samba-configuration?
  (package              samba-configuration-package
                        (default samba))
  (config-file          samba-configuration-config-file
                        (default #f))
  (enable-samba?        samba-configuration-enable-samba?
                        (default #f))
  (enable-smbd?         samba-configuration-enable-smbd?
                        (default #t))
  (enable-nmbd?         samba-configuration-enable-nmbd?
                        (default #t))
  (enable-winbindd?     samba-configuration-enable-winbindd?
                        (default #t)))

(define (samba-activation config)
  (let ((package (samba-configuration-package config))
        (config-file (samba-configuration-config-file config)))
    (with-imported-modules '((guix build utils))
      (let ((lib-dir "/var/lib/samba")
            (log-dir "/var/log/samba")
            (run-dir "/var/run/samba")
            (lock-dir "/var/lock/samba")
            (cache-dir "/var/cache/samba")
            (etc-dir "/etc/samba")
            (smb.conf "/etc/samba/smb.conf"))
        #~(begin
            (use-modules (guix build utils))
            (mkdir-p #$etc-dir)
            (mkdir-p #$lib-dir)
            (mkdir-p/perms (string-append #$lib-dir "/private")
                           (getpwnam "root") #o700)
            (mkdir-p #$log-dir)
            (mkdir-p #$run-dir)
            (mkdir-p #$lock-dir)
            (mkdir-p #$cache-dir)
            (copy-file #$config-file #$smb.conf)
            (invoke #$(file-append package "/bin/testparm")
                    "--suppress-prompt" #$smb.conf))))))

(define (samba-samba-shepherd-service config)
  (let ((package (samba-configuration-package config))
        (config-file (samba-configuration-config-file config)))
       (list (shepherd-service
              (documentation "Run Samba")
              (provision '(samba-samba))
              (requirement '(networking))
              (start #~(make-forkexec-constructor
                        (list #$(file-append package "/sbin/samba")
                              (string-append "--configfile=" #$config-file)
                              "--foreground"
                              "--no-process-group")))
              (stop #~(make-kill-destructor))))))

(define (samba-nmbd-shepherd-service config)
  (let ((package (samba-configuration-package config))
        (config-file (samba-configuration-config-file config)))
       (list (shepherd-service
              (documentation "Run NMBD")
              (provision '(samba-nmbd))
              (requirement '(networking))
              (start #~(make-forkexec-constructor
                        (list #$(file-append package "/sbin/nmbd")
                              (string-append "--configfile=" #$config-file)
                              "--foreground"
                              "--no-process-group")))
              (stop #~(make-kill-destructor))))))

(define (samba-smbd-shepherd-service config)
  (let ((package (samba-configuration-package config))
        (config-file (samba-configuration-config-file config)))
       (list (shepherd-service
              (documentation "Run SMBD")
              (provision '(samba-smbd))
              (requirement '(networking))
              (start #~(make-forkexec-constructor
                        (list #$(file-append package "/sbin/smbd")
                              (string-append "--configfile=" #$config-file)
                              "--foreground"
                              "--no-process-group")))
              (stop #~(make-kill-destructor))))))

(define (samba-winbindd-shepherd-service config)
  (let ((package (samba-configuration-package config))
        (config-file (samba-configuration-config-file config)))
       (list (shepherd-service
              (documentation "Run Winnbindd for Name Service Switch")
              (provision '(samba-winbindd))
              (requirement '(networking))
              (start #~(make-forkexec-constructor
                        (list #$(file-append package "/sbin/winbindd")
                              (string-append "--configfile=" #$config-file)
                              "--foreground"
                              "--no-process-group")))
              (stop #~(make-kill-destructor))))))

(define (samba-shepherd-services config)
  (append (if (samba-configuration-enable-samba? config)
              (samba-samba-shepherd-service config)
              '())
          (if (samba-configuration-enable-nmbd? config)
              (samba-nmbd-shepherd-service config)
              '())
          (if (samba-configuration-enable-smbd? config)
              (samba-smbd-shepherd-service config)
              '())
          (if (samba-configuration-enable-winbindd? config)
              (samba-winbindd-shepherd-service config)
              '())))

(define samba-service-type
  (service-type
   (name 'samba)
   (description "Run @uref{https://www.samba.org/, Samba}, a network file and
print service for all clients using the SMB/CIFS protocol.  Samba is an
important component to seamlessly integrate Linux/Unix Servers and Desktops
into Active Directory environments.  It can function both as a domain
controller or as a regular domain member.")
   (extensions
    (list (service-extension shepherd-root-service-type
                             samba-shepherd-services)
          (service-extension activation-service-type
                             samba-activation)
          (service-extension profile-service-type
                             (compose list samba-configuration-package))))
   (default-value (samba-configuration))))