lightningd: Add --test-daemons-only option.

lightningd/lightningd.c

@@ -81,7 +81,7 @@ static const char *daemons[] = {
 };
 
 /* Check we can run them, and check their versions */
-static void test_daemons(const struct lightningd *ld)
+void test_daemons(const struct lightningd *ld)
 {
 	size_t i;
 	const tal_t *ctx = tal_tmpctx(ld);

lightningd/lightningd.h

@@ -175,4 +175,7 @@ struct chainparams *get_chainparams(const struct lightningd *ld);
 /* State for performing backtraces. */
 struct backtrace_state *backtrace_state;
 
+/* Check we can run subdaemons, and check their versions */
+void test_daemons(const struct lightningd *ld);
+
 #endif /* LIGHTNING_LIGHTNINGD_LIGHTNINGD_H */

lightningd/options.c

@@ -516,6 +516,13 @@ static void opt_parse_from_config(struct lightningd *ld)
 	tal_free(contents);
 }
 
+static char *test_daemons_and_exit(struct lightningd *ld)
+{
+	test_daemons(ld);
+	exit(0);
+	return NULL;
+}
+
 void register_opts(struct lightningd *ld)
 {
 	opt_set_alloc(opt_allocfn, tal_reallocfn, tal_freefn);
@@ -524,6 +531,9 @@ void register_opts(struct lightningd *ld)
 				 "\n"
 				 "A bitcoin lightning daemon.",
 				 "Print this message.");
+	opt_register_early_noarg("--test-daemons-only",
+				 test_daemons_and_exit,
+				 ld, opt_hidden);
 	opt_register_arg("--port", opt_set_u16, opt_show_u16, &ld->portnum,
 			 "Port to bind to (0 means don't listen)");
 	opt_register_arg("--bitcoin-datadir", opt_set_talstr, NULL,