utils: Use 'scandir' instead of custom 'for-each-file'

* src/mcron/utils.scm (for-each-file): Delete.
* src/mcron/scripts/cron.scm (process-files-in-system-directory): Use
'scandir' which has the benefit of being deterministic.
* src/mcron/scripts/mcron.scm (process-files-in-user-directory):
Likewise.
* tests/schedule.sh: Update expected output which is now more reliable.
* NEWS: Update.

Suggested-by: Ludovic Courtès <ludo@gnu.org>

NEWS

@@ -15,6 +15,8 @@ GNU Mcron NEWS                                    -*- outline -*-
   Some basic tests for the installed programs can be run after 'make install'
   with 'make installcheck'.
 
+  The configuration files are now processed using a deterministic order.
+
 * Noteworthy changes in release 1.1 (2018-03-19) [stable]
 
 ** New features

src/mcron/scripts/cron.scm

@@ -1,6 +1,6 @@
 ;;;; cron -- daemon for running jobs at scheduled times
 ;;; Copyright © 2003, 2012 Dale Mellor <dale_mellor@users.sourceforge.net>
-;;; Copyright © 2015, 2016 Mathieu Lirzin <mthl@gnu.org>
+;;; Copyright © 2015, 2016, 2018 Mathieu Lirzin <mthl@gnu.org>
 ;;;
 ;;; This file is part of GNU Mcron.
 ;;;
@@ -18,6 +18,7 @@
 ;;; along with GNU Mcron.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (mcron scripts cron)
+  #:use-module (ice-9 ftw)
   #:use-module (mcron base)
   #:use-module (mcron config)
   #:use-module (mcron job-specifier)
@@ -84,13 +85,13 @@ operation.  The permissions on the /var/cron/tabs directory enforce this."
 
   (catch #t
     (λ ()
-      (for-each-file
+      (for-each
        (λ (user)
          (and-let* ((entry (user-entry user))) ;crontab without user?
            (set-configuration-user entry)
            (catch-mcron-error
             (read-vixie-file (string-append config-spool-dir "/" user)))))
-       config-spool-dir))
+       (scandir config-spool-dir)))
     (λ (key . args)
       (mcron-error 4
         "You do not have permission to access the system crontabs."))))

src/mcron/scripts/mcron.scm

@@ -1,6 +1,6 @@
 ;;;; mcron -- run jobs at scheduled times
 ;;; Copyright © 2003, 2012 Dale Mellor <dale_mellor@users.sourceforge.net>
-;;; Copyright © 2015, 2016 Mathieu Lirzin <mthl@gnu.org>
+;;; Copyright © 2015, 2016, 2018 Mathieu Lirzin <mthl@gnu.org>
 ;;;
 ;;; This file is part of GNU Mcron.
 ;;;
@@ -18,6 +18,7 @@
 ;;; along with GNU Mcron.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (mcron scripts mcron)
+  #:use-module (ice-9 ftw)
   #:use-module (mcron base)
   #:use-module (mcron config)
   #:use-module (mcron job-specifier)    ;for user/system files
@@ -49,11 +50,10 @@ $XDG_CONFIG_HOME is not defined uses ~/.config/cron instead)."
     (map (λ (dir)
            (catch #t
              (λ ()
-               (for-each-file
-                (λ (file)
+               (for-each (λ (file)
                            (process-user-file (string-append dir "/" file)
                                               #:input input-type))
-                dir))
+                         (scandir dir)))
              (λ (key . args)
                (set! errors (1+ errors)))))
          (list (string-append home-directory "/.cron")

src/mcron/utils.scm

@@ -1,6 +1,6 @@
 ;;;; utils.scm -- helper procedures
 ;;; Copyright © 2003, 2012 Dale Mellor <dale_mellor@users.sourceforge.net>
-;;; Copyright © 2015, 2016 Mathieu Lirzin <mthl@gnu.org>
+;;; Copyright © 2015, 2016, 2018 Mathieu Lirzin <mthl@gnu.org>
 ;;;
 ;;; This file is part of GNU Mcron.
 ;;;
@@ -29,7 +29,6 @@
             parse-args
             show-version
             show-package-information
-            for-each-file
             process-update-request)
   #:re-export (option-ref
                read-string))
@@ -81,18 +80,6 @@ General help using GNU software: <http://www.gnu.org/gethelp/>\n"
 		 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

tests/schedule.sh

@@ -41,14 +41,10 @@ EOF
 
 cat > expected <<EOF
 Thu Jan  1 00:00:01 1970 +0000
-(display foo
+(display bar
 )
 
 Thu Jan  1 00:00:01 1970 +0000
-(display bar
-)
-
-Thu Jan  1 00:00:02 1970 +0000
 (display foo
 )
 
@@ -56,7 +52,7 @@ Thu Jan  1 00:00:02 1970 +0000
 (display bar
 )
 
-Thu Jan  1 00:00:03 1970 +0000
+Thu Jan  1 00:00:02 1970 +0000
 (display foo
 )
 
@@ -64,7 +60,7 @@ Thu Jan  1 00:00:03 1970 +0000
 (display bar
 )
 
-Thu Jan  1 00:00:04 1970 +0000
+Thu Jan  1 00:00:03 1970 +0000
 (display foo
 )
 
@@ -72,7 +68,7 @@ Thu Jan  1 00:00:04 1970 +0000
 (display bar
 )
 
-Thu Jan  1 00:00:05 1970 +0000
+Thu Jan  1 00:00:04 1970 +0000
 (display foo
 )
 
@@ -80,7 +76,7 @@ Thu Jan  1 00:00:05 1970 +0000
 (display bar
 )
 
-Thu Jan  1 00:00:06 1970 +0000
+Thu Jan  1 00:00:05 1970 +0000
 (display foo
 )
 
@@ -88,7 +84,7 @@ Thu Jan  1 00:00:06 1970 +0000
 (display bar
 )
 
-Thu Jan  1 00:00:07 1970 +0000
+Thu Jan  1 00:00:06 1970 +0000
 (display foo
 )
 
@@ -96,7 +92,7 @@ Thu Jan  1 00:00:07 1970 +0000
 (display bar
 )
 
-Thu Jan  1 00:00:08 1970 +0000
+Thu Jan  1 00:00:07 1970 +0000
 (display foo
 )
 
@@ -104,7 +100,7 @@ Thu Jan  1 00:00:08 1970 +0000
 (display bar
 )
 
-Thu Jan  1 00:00:09 1970 +0000
+Thu Jan  1 00:00:08 1970 +0000
 (display foo
 )
 
@@ -112,7 +108,7 @@ Thu Jan  1 00:00:09 1970 +0000
 (display bar
 )
 
-Thu Jan  1 00:00:10 1970 +0000
+Thu Jan  1 00:00:09 1970 +0000
 (display foo
 )
 
@@ -120,6 +116,10 @@ Thu Jan  1 00:00:10 1970 +0000
 (display bar
 )
 
+Thu Jan  1 00:00:10 1970 +0000
+(display foo
+)
+
 EOF
 
 mcron --schedule=10 > output