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;;;; mcron -- run jobs at scheduled times
;;; 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 scripts mcron)
#:use-module (mcron base)
#:use-module (mcron config)
#:use-module (mcron job-specifier) ;for user/system files
#:use-module (mcron main)
#:use-module (mcron vixie-specification)
#:export (main))
(define (show-help)
(display "Usage: mcron [OPTIONS] [FILES]
Run an mcron process according to the specifications in the FILES (`-' for
standard input), or use all the files in ~/.config/cron (or the
deprecated ~/.cron) with .guile or .vixie extensions.
-v, --version Display version
-h, --help Display this help message
-sN, --schedule[=]N Display the next N jobs that will be run by mcron
-d, --daemon Immediately detach the program from the terminal
and run as a daemon process
-i, --stdin=(guile|vixie) Format of data passed as standard input or
file arguments (default guile)")
(newline)
(show-package-information))
(define %options
`((schedule (single-char #\s) (value #t)
(predicate ,(λ (str) (string->number str))))
(daemon (single-char #\d) (value #f))
(noetc (single-char #\n) (value #f))
(stdin (single-char #\i) (value #t)
(predicate ,(λ (val)
(or (string=? val "guile")
(string=? val "vixie")))))
(version (single-char #\v) (value #f))
(help (single-char #\h) (value #f))))
(define process-user-file
(let ((guile-regexp (make-regexp "\\.gui(le)?$"))
(vixie-regexp (make-regexp "\\.vix(ie)?$")))
(lambda* (file-name #:optional guile-syntax? #:key (input "guile"))
"Process FILE-NAME according its extension. When GUILE-SYNTAX? is TRUE,
force guile syntax usage. If FILE-NAME format is not recognized, it is
silently ignored."
(cond ((string=? "-" file-name)
(if (string=? input "vixie")
(read-vixie-port (current-input-port))
(eval-string (stdin->string))))
((or guile-syntax? (regexp-exec guile-regexp file-name))
(load file-name))
((regexp-exec vixie-regexp file-name)
(read-vixie-file file-name))))))
(define (process-files-in-user-directory input-type)
"Process files in $XDG_CONFIG_HOME/cron and/or ~/.cron directories (if
$XDG_CONFIG_HOME is not defined uses ~/.config/cron instead)."
(let ((errors 0)
(home-directory (passwd:dir (getpw (getuid)))))
(map (λ (dir)
(catch #t
(λ ()
(for-each-file
(λ (file)
(process-user-file (string-append dir "/" file)
#:input input-type))
dir))
(λ (key . args)
(set! errors (1+ errors)))))
(list (string-append home-directory "/.cron")
(string-append (or (getenv "XDG_CONFIG_HOME")
(string-append home-directory "/.config"))
"/cron")))
(when (eq? 2 errors)
(mcron-error 13
"Cannot read files in your ~/.config/cron (or ~/.cron) directory."))))
(define (%process-files files input-type)
(if (null? files)
(process-files-in-user-directory input-type)
(for-each (λ (file) (process-user-file file #t)) files)))
;;;
;;; Entry point.
;;;
(define* (main #:optional (args (command-line)))
(let ((opts (parse-args args %options)))
(when config-debug
(debug-enable 'backtrace))
(cond ((option-ref opts 'help #f)
(show-help)
(exit 0))
((option-ref opts 'version #f)
(show-version "mcron")
(exit 0))
(else
(%process-files (option-ref opts '() '())
(option-ref opts 'stdin "guile"))
(cond ((option-ref opts 'schedule #f) ;display jobs schedule
=> (λ (count)
(display (get-schedule (max 1 (string->number count))))
(exit 0)))
((option-ref opts 'daemon #f) ;run mcron as a daemon
(case (primitive-fork)
((0) (setsid))
(else (exit 0)))))
;; Forever execute the 'run-job-loop', and when it drops out (can
;; only be because a message has come in on the socket) we process
;; the socket request before restarting the loop again.
(catch-mcron-error
(let ((fdes-list '()))
(while #t
(run-job-loop fdes-list)
;; we can also drop out of run-job-loop because of a SIGCHLD,
;; so must test FDES-LIST.
(unless (null? fdes-list)
(process-update-request fdes-list)))))))))
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