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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Oleg Pykhalov <go.wigust@gmail.com>
;;;
;;; 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 rsync)
#:use-module (gnu services)
#:use-module (gnu services base)
#:use-module (gnu services shepherd)
#:use-module (gnu system shadow)
#:use-module (gnu packages rsync)
#:use-module (gnu packages admin)
#:use-module (guix records)
#:use-module (guix gexp)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:export (rsync-configuration
rsync-configuration?
rsync-service-type))
;;;; Commentary:
;;;
;;; This module implements a service that to run instance of Rsync,
;;; files synchronization tool.
;;;
;;;; Code:
(define-record-type* <rsync-configuration>
rsync-configuration
make-rsync-configuration
rsync-configuration?
(package rsync-configuration-package ; file-like
(default rsync))
(address rsync-configuration-address ; string | #f
(default #f))
(port-number rsync-configuration-port-number ; integer
(default 873))
(pid-file rsync-configuration-pid-file ; string
(default "/var/run/rsyncd/rsyncd.pid"))
(lock-file rsync-configuration-lock-file ; string
(default "/var/run/rsyncd/rsyncd.lock"))
(log-file rsync-configuration-log-file ; string
(default "/var/log/rsyncd.log"))
(use-chroot? rsync-configuration-use-chroot? ; boolean
(default #t))
(share-path rsync-configuration-share-path ; string
(default "/srv/rsyncd"))
(share-comment rsync-configuration-share-comment ; string
(default "Rsync share"))
(read-only? rsync-configuration-read-only? ; boolean
(default #f))
(timeout rsync-configuration-timeout ; integer
(default 300))
(user rsync-configuration-user ; string
(default "root"))
(group rsync-configuration-group ; string
(default "root"))
(uid rsync-configuration-uid ; string
(default "rsyncd"))
(gid rsync-configuration-gid ; string
(default "rsyncd")))
(define (rsync-account config)
"Return the user accounts and user groups for CONFIG."
(let ((rsync-user (if (rsync-configuration-uid config)
(rsync-configuration-uid config)
(rsync-configuration-user config)))
(rsync-group (if (rsync-configuration-gid config)
(rsync-configuration-gid config)
(rsync-configuration-group config))))
(list (user-group (name rsync-group) (system? #t))
(user-account
(name rsync-user)
(system? #t)
(group rsync-group)
(comment "rsyncd privilege separation user")
(home-directory (string-append "/var/run/"
rsync-user))
(shell (file-append shadow "/sbin/nologin"))))))
(define (rsync-activation config)
"Return the activation GEXP for CONFIG."
(with-imported-modules '((guix build utils))
#~(begin
(let ((share-directory #$(rsync-configuration-share-path config))
(user (getpw (if #$(rsync-configuration-uid config)
#$(rsync-configuration-uid config)
#$(rsync-configuration-user config))))
(group (getpw (if #$(rsync-configuration-gid config)
#$(rsync-configuration-gid config)
#$(rsync-configuration-group config)))))
(mkdir-p (dirname #$(rsync-configuration-pid-file config)))
(and=> share-directory mkdir-p)
(chown share-directory
(passwd:uid user)
(group:gid group))))))
(define rsync-config-file
;; Return the rsync configuration file corresponding to CONFIG.
(match-lambda
(($ <rsync-configuration> package address port-number pid-file lock-file log-file
use-chroot? share-path share-comment read-only?
timeout user group uid gid)
(if (not (string=? user "root"))
(cond
((<= port-number 1024)
(error (string-append "rsync-service: to run on port "
(number->string port-number)
", user must be root.")))
(use-chroot?
(error (string-append "rsync-service: to run in a chroot"
", user must be root.")))
(uid
(error "rsync-service: to use uid, user must be root."))
(gid
(error "rsync-service: to use gid, user must be root."))))
(mixed-text-file
"rsync.conf"
"# Generated by 'rsync-service'.\n\n"
"pid file = " pid-file "\n"
"lock file = " lock-file "\n"
"log file = " log-file "\n"
(if address (string-append "address = " address "\n") "")
"port = " (number->string port-number) "\n"
"use chroot = " (if use-chroot? "true" "false") "\n"
(if uid (string-append "uid = " uid "\n") "")
"gid = " (if gid gid "nogroup") "\n" ; no group nobody
"\n"
"[files]\n"
"path = " share-path "\n"
"comment = " share-comment "\n"
"read only = " (if read-only? "true" "false") "\n"
"timeout = " (number->string timeout) "\n"))))
(define (rsync-shepherd-service config)
"Return a <shepherd-service> for rsync with CONFIG."
(let* ((rsync (rsync-configuration-package config))
(pid-file (rsync-configuration-pid-file config))
(port-number (rsync-configuration-port-number config))
(user (rsync-configuration-user config))
(group (rsync-configuration-group config)))
(list (shepherd-service
(provision '(rsync))
(documentation "Run rsync daemon.")
(start #~(make-forkexec-constructor
(list (string-append #$rsync "/bin/rsync")
"--config" #$(rsync-config-file config)
"--daemon")
#:pid-file #$pid-file
#:user #$user
#:group #$group))
(stop #~(make-kill-destructor))))))
(define rsync-service-type
(service-type
(name 'rsync)
(extensions
(list (service-extension shepherd-root-service-type rsync-shepherd-service)
(service-extension account-service-type rsync-account)
(service-extension activation-service-type rsync-activation)))
(default-value (rsync-configuration))))
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