[Tarantool-patches] [PATCH v2 4/6] alter: parse data dictionary version

[Mergen Imeev via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

Version is needed to disallow creation of SQL built-in functions using
_func starting with 2.9.0.

Needed for #6106
---
 src/box/alter.cc  | 18 ++++++++++++++++++
 src/box/schema.cc |  3 +++
 src/box/schema.h  |  1 +
 3 files changed, 22 insertions(+)

diff --git a/src/box/alter.cc b/src/box/alter.cc
index 935790df4..217b882ba 100644
--- a/src/box/alter.cc
+++ b/src/box/alter.cc
@@ -4167,6 +4167,24 @@ on_replace_dd_schema(struct trigger * /* trigger */, void *event)
 			return -1;
 		REPLICASET_UUID = uu;
 		say_info("cluster uuid %s", tt_uuid_str(&uu));
+	} else if (strcmp(key, "version") == 0) {
+		if (new_tuple != NULL) {
+			uint32_t major, minor, patch;
+			if (tuple_field_u32(new_tuple, 1, &major) != 0 ||
+			    tuple_field_u32(new_tuple, 2, &minor) != 0)
+				tnt_raise(ClientError, ER_WRONG_DD_VERSION);
+			/* Version can be major.minor with no patch. */
+			if (tuple_field_u32(new_tuple, 3, &patch) != 0)
+				patch = 0;
+			dd_version_id = version_id(major, minor, patch);
+		} else {
+			assert(old_tuple != NULL);
+			/*
+			 * _schema:delete({'version'}) for
+			 * example, for box.internal.bootstrap().
+			 */
+			dd_version_id = tarantool_version_id();
+		}
 	}
 	return 0;
 }
diff --git a/src/box/schema.cc b/src/box/schema.cc
index 963278b19..5659e15b7 100644
--- a/src/box/schema.cc
+++ b/src/box/schema.cc
@@ -70,6 +70,9 @@ uint32_t schema_version = 0;
  */
 uint32_t space_cache_version = 0;
 
+/** Persistent version of the schema, stored in _schema["version"]. */
+uint32_t dd_version_id = 0;
+
 struct rlist on_schema_init = RLIST_HEAD_INITIALIZER(on_schema_init);
 struct rlist on_alter_space = RLIST_HEAD_INITIALIZER(on_alter_space);
 struct rlist on_alter_sequence = RLIST_HEAD_INITIALIZER(on_alter_sequence);
diff --git a/src/box/schema.h b/src/box/schema.h
index 25ac6f110..d3bbdd590 100644
--- a/src/box/schema.h
+++ b/src/box/schema.h
@@ -44,6 +44,7 @@ struct func;
 
 extern uint32_t schema_version;
 extern uint32_t space_cache_version;
+extern uint32_t dd_version_id;
 
 /** Triggers invoked after schema initialization. */
 extern struct rlist on_schema_init;
-- 
2.25.1