varnishtest -i builds vmod_path instead of macros

The macros are still here but ${vmod_std} is now expanded to std and so
on.

bin/varnishtest/tests/m00008.vtc

@@ -15,7 +15,7 @@ varnish v1 -cliok "param.set vcc_unsafe_path off"
 
 varnish v1 -errvcl {'import ... from path ...' is unsafe.} {
 	backend default { .host = "${s1_sock}"; }
-	import ${vmod_std};
+	import std from "${topbuild}/lib/libvmod_std/.libs/";
 }
 
 varnish v1 \

bin/varnishtest/vtc_main.c

@@ -94,6 +94,7 @@ static int vtc_good;
 static int vtc_fail;
 static char *tmppath;
 static char *cwd = NULL;
+char *vmod_path = NULL;
 int leave_temp;
 int vtc_witness = 0;
 int feature_dns;
@@ -130,7 +131,7 @@ usage(void)
 	fprintf(stderr, FMT, "-b size",
 	    "Set internal buffer size (default: 512K)");
 	fprintf(stderr, FMT, "-D name=val", "Define macro");
-	fprintf(stderr, FMT, "-i", "Find varnishd in build tree");
+	fprintf(stderr, FMT, "-i", "Find varnish binaries in build tree");
 	fprintf(stderr, FMT, "-j jobs", "Run this many tests in parallel");
 	fprintf(stderr, FMT, "-k", "Continue on test failure");
 	fprintf(stderr, FMT, "-L", "Always leave temporary vtc.*");
@@ -376,19 +377,22 @@ i_mode(void)
 	AZ(putenv(strdup(VSB_data(vsb))));
 
 	/*
-	 * Redefine VMOD macros
+	 * Build vmod_path which can find all VMODs in the build tree
 	 */
+	VSB_clear(vsb);
+	sep = "";
 #define VTC_VMOD(l)							\
 	do {								\
-		VSB_clear(vsb);						\
-		VSB_printf(vsb,						\
-		   "%s from \"%s/lib/libvmod_%s/.libs/libvmod_%s.so\"",	\
-		    #l, topbuild, #l, #l);				\
-		AZ(VSB_finish(vsb));					\
-	    extmacro_def("vmod_" #l, "%s", VSB_data(vsb));		\
+		VSB_printf(vsb, "%s%s/lib/libvmod_" #l "/.libs",	\
+		    sep, topbuild);					\
+		sep = ":";						\
+		extmacro_def("vmod_" #l, #l);				\
 	} while (0);
 #include "vmods.h"
 #undef VTC_VMOD
+	AZ(VSB_finish(vsb));
+	vmod_path = strdup(VSB_data(vsb));
+	AN(vmod_path);
 	free(topbuild);
 	VSB_delete(vsb);
 }
@@ -487,6 +491,8 @@ main(int argc, char * const *argv)
 	cwd = getcwd(NULL, PATH_MAX);
 	extmacro_def("pwd", "%s", cwd);
 
+	vmod_path = NULL;
+
 	setbuf(stdout, NULL);
 	setbuf(stderr, NULL);
 	while ((ch = getopt(argc, argv, "b:D:hij:kLln:qt:vW")) != -1) {

bin/varnishtest/vtc_varnish.c

@@ -54,6 +54,7 @@
 #include "vtim.h"
 
 extern int leave_temp;
+extern char *vmod_path;
 
 struct varnish {
 	unsigned		magic;
@@ -419,6 +420,8 @@ varnish_launch(struct varnish *v)
 		VSB_printf(vsb, ",%s", v->proto);
 	VSB_printf(vsb, " -M '%s %s'", abuf, pbuf);
 	VSB_printf(vsb, " -P %s/varnishd.pid", v->workdir);
+	if (vmod_path != NULL)
+		VSB_printf(vsb, " -p vmod_path=%s", vmod_path);
 	VSB_printf(vsb, " %s", VSB_data(v->args));
 	AZ(VSB_finish(vsb));
 	vtc_log(v->vl, 3, "CMD: %s", VSB_data(vsb));

doc/sphinx/reference/varnishtest.rst

@@ -36,7 +36,7 @@ The following options are available:
 
 -h               Show help
 
--i               Set PATH to find varnish binaries in build tree
+-i               Set PATH and vmod_path to find varnish binaries in build tree
 
 -j jobs          Run this many tests in parallel