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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019 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 system accounts)
+  #:use-module (guix records)
+  #:use-module (ice-9 match)
+  #:export (user-account
+            user-account?
+            user-account-name
+            user-account-password
+            user-account-uid
+            user-account-group
+            user-account-supplementary-groups
+            user-account-comment
+            user-account-home-directory
+            user-account-create-home-directory?
+            user-account-shell
+            user-account-system?
+
+            user-group
+            user-group?
+            user-group-name
+            user-group-password
+            user-group-id
+            user-group-system?
+
+            sexp->user-account
+            sexp->user-group
+
+            default-shell))
+
+
+;;; Commentary:
+;;;
+;;; Data structures representing user accounts and user groups.  This is meant
+;;; to be used both on the host side and at run time--e.g., in activation
+;;; snippets.
+;;;
+;;; Code:
+
+(define default-shell
+  ;; Default shell for user accounts (a string or string-valued gexp).
+  (make-parameter "/bin/sh"))
+
+(define-record-type* <user-account>
+  user-account make-user-account
+  user-account?
+  (name           user-account-name)
+  (password       user-account-password (default #f))
+  (uid            user-account-uid (default #f))
+  (group          user-account-group)             ; number | string
+  (supplementary-groups user-account-supplementary-groups
+                        (default '()))            ; list of strings
+  (comment        user-account-comment (default ""))
+  (home-directory user-account-home-directory)
+  (create-home-directory? user-account-create-home-directory? ;Boolean
+                          (default #t))
+  (shell          user-account-shell              ; gexp
+                  (default (default-shell)))
+  (system?        user-account-system?            ; Boolean
+                  (default #f)))
+
+(define-record-type* <user-group>
+  user-group make-user-group
+  user-group?
+  (name           user-group-name)
+  (password       user-group-password (default #f))
+  (id             user-group-id (default #f))
+  (system?        user-group-system?              ; Boolean
+                  (default #f)))
+
+(define (sexp->user-group sexp)
+  "Take SEXP, a tuple as returned by 'user-group->gexp', and turn it into a
+user-group record."
+  (match sexp
+    ((name password id system?)
+     (user-group (name name)
+                 (password password)
+                 (id id)
+                 (system? system?)))))
+
+(define (sexp->user-account sexp)
+  "Take SEXP, a tuple as returned by 'user-account->gexp', and turn it into a
+user-account record."
+  (match sexp
+    ((name uid group supplementary-groups comment home-directory
+           create-home-directory? shell password system?)
+     (user-account (name name) (uid uid) (group group)
+                   (supplementary-groups supplementary-groups)
+                   (comment comment)
+                   (home-directory home-directory)
+                   (create-home-directory? create-home-directory?)
+                   (shell shell) (password password)
+                   (system? system?)))))