comm: make sure that our version check is reliable

Rework the logic of the version check used in the
database migration, and make sure
that it is full functional to avoid confusion
at release time.

Changelog-Fixed: database: Correctly identity official release versions for database upgrade.

Reported-by: @urza
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

common/test/Makefile

@@ -90,4 +90,11 @@ common/test/run-bolt12_merkle-json:			\
 	common/base32.o					\
 	common/wireaddr.o
 
+
+common/test/run-version:				\
+	common/amount.o                                 \
+	wire/fromwire.o					\
+	wire/towire.o
+
+
 check-units: $(COMMON_TEST_PROGRAMS:%=unittest/%)

common/test/run-version.c

@@ -0,0 +1,16 @@
+#include "config.h"
+#include "../version.c"
+#include <common/setup.h>
+#include <assert.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+	common_setup(argv[0]);
+
+	assert(cmp_release_version("v22.11"));
+	assert(cmp_release_version("v22.11.1"));
+	assert(cmp_release_version("v22.11.1-6-gdf29990-modded") == false);
+
+	common_shutdown();
+}

common/version.c

@@ -3,6 +3,7 @@
 #include <common/version.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 /* Only common/version.c can safely include this.  */
 # include "version_gen.h"
@@ -20,3 +21,15 @@ char *version_and_exit(const void *unused UNUSED)
 	}
 	exit(0);
 }
+
+static bool cmp_release_version(const char *version) {
+	if (version[0] != 'v')
+		return false;
+	return strspn(version+1, ".0123456789") == strlen(version+1);
+}
+
+/* Released versions are of form v[year].[month]?(.patch)* */
+bool is_released_version(void)
+{
+	return cmp_release_version(version());
+}

common/version.h

@@ -1,9 +1,14 @@
 #ifndef LIGHTNING_COMMON_VERSION_H
 #define LIGHTNING_COMMON_VERSION_H
 #include "config.h"
+#include <stdbool.h>
 
 char *version_and_exit(const void *unused);
 const char *version(void);
+/* check if the current version is a release version.
+ *
+ * Released versions are of form v[year].[month]?(.patch)* */
+bool is_released_version(void);
 
 #define opt_register_version()						\
 	opt_register_early_noarg("--version|-V", version_and_exit, NULL, \

wallet/db.c

@@ -945,14 +945,6 @@ static struct migration dbmigrations[] = {
     /* FIXME: Remove payments local_offer_id column! */
 };
 
-/* Released versions are of form v{num}[.{num}]* */
-static bool is_released_version(void)
-{
-	if (version()[0] != 'v')
-		return false;
-	return strcspn(version()+1, ".0123456789") == strlen(version()+1);
-}
-
 /**
  * db_migrate - Apply all remaining migrations from the current version
  */