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+;;;; utils.scm -- helper procedures
+;;; Copyright © 2003, 2012 Dale Mellor <dale_mellor@users.sourceforge.net>
+;;; Copyright © 2015, 2016 Mathieu Lirzin <mthl@gnu.org>
+;;;
+;;; This file is part of GNU Mcron.
+;;;
+;;; GNU Mcron 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 Mcron 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 Mcron.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (mcron utils)
+  #:use-module (ice-9 getopt-long)
+  #:use-module (ice-9 rdelim)
+  #:use-module (mcron config)
+  #:use-module (mcron base)
+  #:use-module (mcron job-specifier)
+  #:use-module (mcron vixie-specification)
+  #:export (catch-mcron-error
+            mcron-error
+            parse-args
+            show-version
+            show-package-information
+            for-each-file
+            process-update-request)
+  #:re-export (option-ref
+               read-string))
+
+(define (mcron-error exit-code . rest)
+  "Print an error message (made up from the parts of REST), and if the
+EXIT-CODE error is fatal (present and non-zero) then exit to the system with
+EXIT-CODE."
+  (with-output-to-port (current-error-port)
+    (lambda ()
+      (for-each display (cons "mcron: " rest))
+      (newline)))
+  (when (and exit-code (not (eq? exit-code 0)))
+    (primitive-exit exit-code)))
+
+(define-syntax-rule (catch-mcron-error exp ...)
+  "Evaluate EXP .... if an 'mcron-error exception occurs, print its diagnostics
+and exit with its error code."
+  (catch 'mcron-error
+    (lambda () exp ...)
+    (lambda (key exit-code . msg)
+      (apply mcron-error exit-code msg))))
+
+(define (parse-args args option-desc-list)
+  "Parse ARGS with OPTION-DESC-LIST specification."
+  (catch 'misc-error
+    (lambda () (getopt-long args option-desc-list))
+    (lambda (key func fmt args . rest)
+      (mcron-error 1 (apply format (append (list #f fmt) args))))))
+
+(define (show-version command)
+  "Display version information for COMMAND and quit."
+  (let* ((name       config-package-name)
+         (short-name (cadr (string-split name #\space)))
+         (version    config-package-version))
+    (simple-format #t "~a (~a) ~a
+Copyright (C) 2015 the ~a authors.
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.\n"
+		   command name version short-name)))
+
+(define (show-package-information)
+  "Display where to get help and send bug reports."
+  (simple-format #t "\nReport bugs to: ~a.
+~a home page: <~a>
+General help using GNU software: <http://www.gnu.org/gethelp/>\n"
+		 config-package-bugreport
+		 config-package-name
+		 config-package-url))
+
+(define (for-each-file proc directory)
+  "Apply PROC to each file in DIRECTORY.  DIRECTORY must be a valid directory name.
+PROC must be a procedure that take one file name argument.  The return value
+is not specified"
+  (let ((dir (opendir directory)))
+    (let loop ((file-name (readdir dir)))
+      (if (eof-object? file-name)
+          (closedir dir)
+          (begin
+            (proc file-name)
+            (loop (readdir dir)))))))
+
+(define (process-update-request fdes-list)
+  "Read a user name from the socket, dealing with the /etc/crontab special
+case, remove all the user's jobs from the job list, and then re-read the
+user's updated file.  In the special case drop all the system jobs and re-read
+the /etc/crontab file.  This function should be called whenever a message
+comes in on the above socket."
+  (let* ((sock      (car (accept (car fdes-list))))
+         (user-name (read-line sock)))
+    (close sock)
+    (set-configuration-time (current-time))
+    (catch-mcron-error
+     (if (string=? user-name "/etc/crontab")
+         (begin
+           (clear-system-jobs)
+           (use-system-job-list)
+           (read-vixie-file "/etc/crontab" parse-system-vixie-line)
+           (use-user-job-list))
+         (let ((user (getpw user-name)))
+           (remove-user-jobs user)
+           (set-configuration-user user)
+           (read-vixie-file (string-append config-spool-dir "/" user-name)))))))