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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)))))))
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