getinfo: add version information

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Makefile

@@ -305,7 +305,7 @@ doc/full-states.dot: test/test_state_coverage
 
 gen_version.h: FORCE
 	@(echo "#define VERSION \"`git describe --always --dirty`\"" && echo "#define VERSION_NAME \"$(NAME)\"" && echo "#define BUILD_FEATURES \"$(FEATURES)\"") > $@.new
-	@if cmp $@.new $@ >/dev/null 2>&2; then rm -f $@.new; else mv $@.new $@; fi
+	@if cmp $@.new $@ >/dev/null 2>&2; then rm -f $@.new; else mv $@.new $@; echo Version updated; fi
 
 version.o: gen_version.h
 

daemon/jsonrpc.c

@@ -6,6 +6,7 @@
 #include "lightningd.h"
 #include "log.h"
 #include "peer.h"
+#include "version.h"
 #include <ccan/array_size/array_size.h>
 #include <ccan/err/err.h>
 #include <ccan/io/io.h>
@@ -266,6 +267,7 @@ static void json_getinfo(struct command *cmd,
 	if (cmd->dstate->portnum)
 		json_add_num(response, "port", cmd->dstate->portnum);
 	json_add_bool(response, "testnet", cmd->dstate->config.testnet);
+	json_add_string(response, "version", version());
 	json_object_end(response);
 	command_success(cmd, response);
 }

daemon/test/test.sh

@@ -439,6 +439,10 @@ if ! check "$LCLI3 getlog 2>/dev/null | $FGREP Hello"; then
     exit 1
 fi
 
+# Version should be correct
+VERSION=`$LCLI1 getinfo | sed -n 's/.*"version" : "\([^"]*\)".*/\1/p'`
+[ $VERSION = `git describe --always --dirty` ] || (echo Wrong version $VERSION >&2; exit 1)
+
 ID1=`$LCLI1 getlog | sed -n 's/.*"ID: \([0-9a-f]*\)".*/\1/p'`
 [ `$LCLI1 getinfo | sed -n 's/.*"id" : "\([0-9a-f]*\)".*/\1/p'` = $ID1 ]
 ID2=`$LCLI2 getlog | sed -n 's/.*"ID: \([0-9a-f]*\)".*/\1/p'`

version.c

@@ -2,6 +2,11 @@
 #include "version.h"
 #include <stdio.h>
 
+const char *version(void)
+{
+	return VERSION;
+}
+
 char *version_and_exit(const void *unused)
 {
 	printf("%s\n"

version.h

@@ -4,6 +4,7 @@
 #include <ccan/opt/opt.h>
 
 char *version_and_exit(const void *unused);
+const char *version(void);
 
 #define opt_register_version()						\
 	opt_register_noarg("--version|-V", version_and_exit, NULL,	\