From: Christian Kastner <ckk@kvr.at>
Date: Sat, 26 Dec 2015 11:34:00 +0100
Subject: Don't run reboot jobs on restart

Don't run reboot jobs when restarting the cron daemon.

Fix provided by Steve Greenland <stevegr@debian.org>.

Bug-Debian: https://bugs.debian.org/74762
Bug-Debian: https://bugs.debian.org/77563
Forwarded: no
Last-Update: 2015-12-26
Index: conv3/cron.c
===================================================================
--- conv3.orig/cron.c
+++ conv3/cron.c
@@ -31,6 +31,7 @@ static char rcsid[] = "$Id: cron.c,v 2.1
 # include <time.h>
 #endif
 
+#include <sys/stat.h>
 #include <sys/types.h>
 #include <fcntl.h>
 
@@ -148,7 +149,25 @@ run_reboot_jobs(db)
 {
 	register user		*u;
 	register entry		*e;
+	int			rbfd;
 
+	/* Run on actual reboot, rather than cron restart */
+	if (access(REBOOT_FILE, F_OK) == 0) {
+		/* File exists, return */
+		log_it("CRON", getpid(),"INFO",
+			"Skipping @reboot jobs -- not system startup");
+		return;
+	}
+	/* Create the file */
+	if ((rbfd = creat(REBOOT_FILE, S_IRUSR & S_IWUSR)) < 0) {
+		/* Bad news, bail out */
+		log_it("CRON",getpid(),"DEATH","Can't create reboot check file");
+		exit(0);
+	} else {
+		close(rbfd);
+		log_it("CRON", getpid(),"INFO", "Running @reboot jobs");
+	}
+	Debug(DMISC, ("[%d], running reboot jobs\n", getpid()));
 	for (u = db->head;  u != NULL;  u = u->next) {
 		for (e = u->crontab;  e != NULL;  e = e->next) {
 			if (e->flags & WHEN_REBOOT) {
Index: conv3/pathnames.h
===================================================================
--- conv3.orig/pathnames.h
+++ conv3/pathnames.h
@@ -79,3 +79,7 @@
 #ifndef _PATH_DEFPATH
 # define _PATH_DEFPATH "/usr/bin:/bin"
 #endif
+
+#ifndef REBOOT_FILE
+# define REBOOT_FILE "/run/crond.reboot"
+#endif