Use varnishd to extract vmod declarations

src/Makefile.am

@@ -25,9 +25,11 @@ TESTS = \
 
 if CHKSUM
 import_vmod_blob.h: vmod_get_h $(VMOD_BLOB)
+	PATH="$(VARNISH_TEST_PATH):$(PATH)" \
 	$(builddir)/vmod_get_h blob $(VMOD_BLOB) >$@.tmp
 	mv -f $@.tmp $@
 import_vmod_blobdigest.h: vmod_get_h $(VMOD_BLOBDIGEST)
+	PATH="$(VARNISH_TEST_PATH):$(PATH)" \
 	$(builddir)/vmod_get_h blobdigest $(VMOD_BLOBDIGEST) >$@.tmp
 	mv -f $@.tmp $@
 libvmod_tus_la_SOURCES = tus_blob.c

src/vmod_get_h.c

@@ -32,6 +32,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
+#include <unistd.h>
+#include <string.h>
 
 #include "vdef.h"
 #include "vrt.h"
@@ -45,10 +47,11 @@ const struct vrt_blob *vrt_null_blob = &(struct vrt_blob){
 int
 main(int argc, char **argv) {
 	void *dlhdl;
-	char buf[256];
+	char buf[256], vcl[64];
 	const struct vmod_data *d;
 	const char *name;
 	const char *file;
+	int i, fd;
 
 	if (argc < 3) {
 		fprintf(stderr, "need 2 arguments\n");
@@ -58,6 +61,25 @@ main(int argc, char **argv) {
 	name = argv[1];
 	file = argv[2];
 
+	bprintf(buf, "vcl 4.1;backend none none;import %s from \"%s\";\n",
+		name, file);
+
+	bprintf(vcl, "/tmp/vmod_get_h_%s_XXXXXX", name);
+	fd = mkstemp(vcl);
+	assert(fd >= 0);
+	i = write(fd, buf, strlen(buf));
+	assert(i > 0);
+	i = close(fd);
+	assert(i == 0);
+
+	bprintf(buf, "varnishd -Cf %s 2>&1 | awk '"
+		"/BEGIN VMOD %s/ {p=1} "
+		"/END VMOD %s/ {exit} "
+		"/./ {if (p == 1) { print }; n;}"
+		"'", vcl, name, name);
+	printf("/* %s */\n", buf);
+	i = system(buf);
+	assert(i == 0);
 
 	dlhdl = dlopen(file, RTLD_LAZY | RTLD_LOCAL);
 	if (dlhdl == NULL) {
@@ -71,7 +93,6 @@ main(int argc, char **argv) {
 		return (1);
 	}
 
-	printf("%s",d->proto);
 	printf("\nstatic const struct vmod_data import_%s = {\n", buf);
 	printf("\t.name =\t\t\"%s\",\n", d->name);
 	printf("\t.file_id =\t\"%s\",\n", d->file_id);