gnu: services: Add autossh.

* gnu/services/autossh.scm: New file.

1 files changed, 165 insertions, 0 deletions

diff --git a/gnu/services/autossh.scm b/gnu/services/autossh.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 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 autossh)
+  #:use-module (gnu packages admin)
+  #:use-module (gnu packages ssh)
+  #:use-module (gnu services base)
+  #:use-module (gnu services configuration)
+  #:use-module (gnu services shepherd)
+  #:use-module (gnu services web)
+  #:use-module (gnu services)
+  #:use-module (gnu system shadow)
+  #:use-module (guix gexp)
+  #:use-module (guix packages)
+  #:use-module (guix records)
+  #:use-module (guix store)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-26)
+  #:export (autossh-configuration
+            autossh-service-type
+            openssh-client-configuration
+            openssh-client-host-configuration
+
+            openssh-client-configuration-fields
+            openssh-client-host-configuration-fields
+            serialize-openssh-client-host-configuration-list))
+
+;;; Commentary:
+;;;
+;;; This module provides a service definition for the SERVICE_NAME
+;;; SERVICE_DESCRTIPTION
+;;;
+;;; Code:
+
+(define (uglify-field-name field-name)
+  (apply string-append
+         (map string-capitalize
+              (string-split (string-delete #\?
+                                           (symbol->string field-name))
+                            #\-))))
+
+(define (serialize-field field-name val)
+  #~(format #f "~a=~a~%" #$(uglify-field-name field-name) #$val))
+
+(define (serialize-number field-name val)
+  (serialize-field field-name (number->string val)))
+
+(define (serialize-list field-name val)
+  (if (null? val) "" (serialize-field field-name (string-join val))))
+
+(define (serialize-string field-name val)
+  (if (and (string? val) (string=? val ""))
+      ""
+      (serialize-field field-name val)))
+
+(define (serialize-boolean field-name val)
+  (serialize-string field-name (if val "yes" "no")))
+
+(define-configuration openssh-client-host-configuration
+  (host
+   (string "")
+   "")
+  (host-name
+   (string "")
+   "")
+  (port
+   (number 22)
+   "")
+  (user
+   (string "")
+   "")
+  (strict-host-key-checking?
+   (boolean #t)
+   "")
+  (identity-file
+   (string "")
+   "")
+  (password-authentication?
+   (boolean #t)
+   ""))
+
+(define (serialize-openssh-client-host-configuration-list field-name val)
+  #~(string-append
+     #$@(map (cut serialize-configuration <>
+                  openssh-client-host-configuration-fields)
+             val)))
+
+(define (openssh-client-host-configuration-list? val)
+  (list? val))
+
+(define-configuration openssh-client-configuration
+  (hosts
+   (openssh-client-host-configuration-list '())
+   "List of hosts."))
+
+(define-record-type* <autossh-configuration>
+  autossh-configuration make-autossh-configuration
+  autossh-configuration?
+  (user autossh-configuration-user ;string
+        (default "autossh"))
+  (group autossh-configuration-group ;string
+         (default "autossh"))
+  (openssh-client-config autossh-configuration-openssh-client-config
+                         (default #f))
+  (host autossh-configuration-host ;string
+        (default "")))
+
+(define autossh-account
+  ;; Return the user accounts and user groups for CONFIG.
+  (match-lambda
+    (($ <autossh-configuration> autossh-user autossh-group _)
+     (list (user-group (name autossh-group) (system? #t))
+           (user-account
+            (name autossh-user)
+            (system? #t)
+            (group autossh-group)
+            (comment "autossh privilege separation user")
+            (home-directory (string-append "/var/run/" autossh-user))
+            (shell #~(string-append #$shadow "/sbin/nologin")))))))
+
+(define autossh-shepherd-service
+  (match-lambda
+    (($ <autossh-configuration> autossh-user autossh-group
+                                openssh-client-config host)
+     (list (shepherd-service
+            (provision '(autossh))
+            (documentation "Run autossh daemon.")
+            (start #~(make-forkexec-constructor
+                      (list (string-append #$autossh "/bin/autossh")
+                            "-F" #$(mixed-text-file "ssh-client.conf"
+                                                    (serialize-configuration openssh-client-config
+                                                                             openssh-client-configuration-fields))
+                            #$host)
+                      #:user #$autossh-user
+                      #:group #$autossh-group))
+            (stop #~(make-kill-destructor)))))))
+
+(define autossh-service-type
+  (service-type
+   (name 'autossh)
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             autossh-shepherd-service)
+          (service-extension account-service-type
+                             autossh-account)))
+   (default-value (autossh-configuration))
+   (description
+    "Run the autossh.")))
+
+;;; autossh.scm ends here