internal: add hardcoded versioning support

Added the _VERSION variable to the exported table.
Is part of the task [1].

1. github.com/tarantool/roadmap-internal/issues/204

Author: GRISHNOV

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+* Add hardcoded versioning support, now the exported table
+  has _VERSION variable.
 
 ### Fixed
 * Pre-hotreload `cartridge` support (older than 2.4.0) (PR #341).

CMakeLists.txt

@@ -91,6 +91,11 @@ install(
   DESTINATION ${TARANTOOL_INSTALL_LUADIR}
 )
 
+install(
+  FILES ${CMAKE_CURRENT_SOURCE_DIR}/crud-version.lua
+  DESTINATION ${TARANTOOL_INSTALL_LUADIR}
+)
+
 install(
   DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/cartridge
   DESTINATION ${TARANTOOL_INSTALL_LUADIR}

crud-version.lua

@@ -0,0 +1,2 @@
+-- Сontains the module version, requires manual update.
+return '1.0.0-1'

crud.lua

@@ -23,6 +23,12 @@ local stats = require('crud.stats')
 
 local crud = {}
 
+local ok, VERSION = pcall(require, 'crud-version')
+if not ok then
+    VERSION = 'unknown, check crud-version file'
+end
+crud['_VERSION'] = VERSION
+
 --- CRUD operations.
 -- @section crud