Add -t VSM open timeout option

This option controls the timeout for the initial VSM open operation

include/vut.h

@@ -43,6 +43,7 @@ struct VUT {
 	char		*P_arg;
 	char		*q_arg;
 	char		*r_arg;
+	double		t_arg;
 
 	/* State */
 	struct VSL_data	*vsl;

include/vut_options.h

@@ -84,6 +84,18 @@
 	    "Read log in binary file format from this file."		\
 	)
 
+#define VUT_OPT_t							\
+	VOPT("t:", "[-t seconds|<off>]", "VSM connection timeout",	\
+	    "Timeout before returning error on initial VSM connection."	\
+	    " If set the VSM connection is retried every 0.5 seconds"	\
+	    " for this many seconds. If zero the connection is"		\
+	    " attempted only once and will fail immediately if"		\
+	    " unsuccessful. If set to \"off\", the connection will not"	\
+	    " fail, allowing the utility to start and wait"		\
+	    " indefinetely for the Varnish instance to appear. "	\
+	    " Defaults to 5 seconds."					\
+	)
+
 #define VUT_OPT_V							\
 	VOPT("V", "[-V]", "Version",					\
 	    "Print version information and exit."			\

lib/libvarnishtools/vut.c

@@ -39,6 +39,7 @@
 #include <errno.h>
 #include <string.h>
 #include <signal.h>
+#include <math.h>
 
 #include "compat/daemon.h"
 #include "vdef.h"
@@ -49,6 +50,7 @@
 #include "vas.h"
 #include "miniobj.h"
 #include "vcs.h"
+#include "vnum.h"
 
 #include "vut.h"
 
@@ -134,6 +136,7 @@ VUT_Arg(int opt, const char *arg)
 {
 	int i;
 	char *p;
+	double d;
 
 	switch (opt) {
 	case 'd':
@@ -182,6 +185,13 @@ VUT_Arg(int opt, const char *arg)
 		/* Binary file input */
 		REPLACE(VUT.r_arg, arg);
 		return (1);
+	case 't':
+		/* VSM connect timeout */
+		d = VNUM(arg);
+		if (isnan(d))
+			VUT_Error(1, "-t: Syntax error");
+		VUT.t_arg = d;
+		return (1);
 	case 'V':
 		/* Print version number and exit */
 		VCS_Message(VUT.progname);
@@ -205,6 +215,7 @@ VUT_Init(const char *progname)
 	VUT.vsl = VSL_New();
 	AN(VUT.vsl);
 	VUT.k_arg = -1;
+	VUT.t_arg = 5.;
 }
 
 void