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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 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 shadow)
+ #:use-module (guix store)
+ #:use-module (ice-9 match)
+ #:export (passwd-file))
+
+;;; Commentary:
+;;;
+;;; Utilities for configuring the Shadow tool suite ('login', 'passwd', etc.)
+;;;
+;;; Code:
+
+(define* (passwd-file store accounts #:key shadow?)
+ "Return a password file for ACCOUNTS, a list of vectors as returned by
+'getpwnam'. If SHADOW? is true, then it is a /etc/shadow file, otherwise it
+is a /etc/passwd file."
+ ;; XXX: The resulting file is world-readable, so beware when SHADOW? is #t!
+ (define contents
+ (let loop ((accounts accounts)
+ (result '()))
+ (match accounts
+ ((#(name pass uid gid comment home-dir shell) rest ...)
+ (loop rest
+ (cons (if shadow?
+ (string-append name
+ ":" ; XXX: use (crypt PASS …)?
+ ":::::::")
+ (string-append name
+ ":" "x"
+ ":" (number->string uid)
+ ":" (number->string gid)
+ ":" comment ":" home-dir ":" shell))
+ result)))
+ (()
+ (string-join (reverse result) "\n" 'suffix)))))
+
+ (add-text-to-store store (if shadow? "shadow" "passwd")
+ contents '()))
+
+;;; shadow.scm ends here