From: Christian Kastner <ckk@kvr.at>
Date: Sun, 10 Jan 2016 20:38:26 +0100
Subject: Enable running daemon in foreground

Enable running the daemon in the foreground by specifying -f as an option.

Contributed by Steve Greenland <stevegr@debian.org>.

Bug-Debian: https://bugs.debian.org/108492
Forwarded: no
Last-Update: 2016-01-10
Index: cron/cron.c
===================================================================
--- cron.orig/cron.c
+++ cron/cron.c
@@ -119,7 +119,7 @@ main(argc, argv)
 	if (0) {
 # endif
 		(void) fprintf(stderr, "[%d] cron started\n", getpid());
-	} else {
+	} else if (!stay_foreground) {
 		switch (fork()) {
 		case -1:
 			log_it("CRON",getpid(),"DEATH","can't fork");
@@ -447,9 +447,9 @@ sighup_handler(int x) {
 
 
 #if DEBUGGING
-const char *getoptarg = "lx:";
+const char *getoptarg = "flx:";
 #else
-const char *getoptarg = "l";
+const char *getoptarg = "fl";
 #endif
 
 static void
@@ -459,12 +459,16 @@ parse_args(argc, argv)
 {
 	int	argch;
 
+	stay_foreground = 0;
 	lsbsysinit_mode = 0;
 
 	while (EOF != (argch = getopt(argc, argv, getoptarg))) {
 		switch (argch) {
 		default:
 			usage();
+		case 'f':
+			stay_foreground = 1;
+			break;
 		case 'l':
 			lsbsysinit_mode = 1;
 			break;
Index: cron/cron.h
===================================================================
--- cron.orig/cron.h
+++ cron/cron.h
@@ -292,6 +292,7 @@ time_min virtualTime;
 time_min clockTime;
 static long GMToff;
 
+int	stay_foreground;
 int	lsbsysinit_mode;
 
 char	cron_default_mail_charset[MAX_ENVSTR] = "";
Index: cron/cron.8
===================================================================
--- cron.orig/cron.8
+++ cron/cron.8
@@ -23,6 +23,7 @@
 cron \- daemon to execute scheduled commands (Vixie Cron)
 .SH SYNOPSIS
 cron
+.RB [ \-f ]
 .RB [ \-l ]
 .SH DESCRIPTION
 .I cron
@@ -30,6 +31,9 @@ is started automatically from /etc/init.
 runlevels.
 .SH OPTIONS
 .TP 8
+.B \-f
+Stay in foreground mode, don't daemonize.
+.TP
 .B \-l
 Enable LSB compliant names for /etc/cron.d files.  This setting, however, does
 not affect the parsing of files under /etc/cron.hourly, /etc/cron.daily,