update(cmake/modules): compute version using libs' GetVersionFromGit

Signed-off-by: Leonardo Grasso <me@leonardograsso.com>

CMakeLists.txt

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2019 The Falco Authors.
+# Copyright (C) 2023 The Falco Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 # the License. You may obtain a copy of the License at
@@ -118,8 +118,6 @@ set(CMAKE_CXX_FLAGS_DEBUG "${FALCO_EXTRA_DEBUG_FLAGS}")
 set(CMAKE_C_FLAGS_RELEASE "-O3 -fno-strict-aliasing -DNDEBUG")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3 -fno-strict-aliasing -DNDEBUG")
 
-include(GetFalcoVersion)
-
 set(PACKAGE_NAME "falco")
 set(DRIVER_NAME "falco")
 set(DRIVER_DEVICE_NAME "falco")
@@ -147,6 +145,9 @@ include(ExternalProject)
 # libs
 include(falcosecurity-libs)
 
+# compute FALCO_VERSION (depends on libs)
+include(falco-version)
+
 # jq
 include(jq)
 

cmake/modules/falco-version.cmake

@@ -0,0 +1,48 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations under the License.
+#
+
+# Retrieve git ref and commit hash
+include(GetVersionFromGit)
+
+# Get Falco version variable according to git index
+if(NOT FALCO_VERSION)
+  set(FALCO_VERSION "0.0.0")
+  get_version_from_git(FALCO_VERSION "" "")
+endif()
+
+# Remove the starting "v" in case there is one
+string(REGEX REPLACE "^v(.*)" "\\1" FALCO_VERSION "${FALCO_VERSION}")
+
+string(REGEX MATCH "^(0|[1-9][0-9]*)" FALCO_VERSION_MAJOR "${FALCO_VERSION}")
+string(REGEX REPLACE "^(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\..*" "\\2" FALCO_VERSION_MINOR "${FALCO_VERSION}")
+string(REGEX REPLACE "^(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*).*" "\\3" FALCO_VERSION_PATCH
+                     "${FALCO_VERSION}")
+string(
+  REGEX
+  REPLACE
+    "^(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)-((0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*)(\\.(0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*))*).*"
+    "\\5"
+    FALCO_VERSION_PRERELEASE
+    "${FALCO_VERSION}")
+
+if(FALCO_VERSION_PRERELEASE STREQUAL "${FALCO_VERSION}")
+  set(FALCO_VERSION_PRERELEASE "")
+endif()
+if(NOT FALCO_VERSION_BUILD)
+  string(REGEX REPLACE ".*\\+([0-9a-zA-Z-]+(\\.[0-9a-zA-Z-]+)*)" "\\1" FALCO_VERSION_BUILD "${FALCO_VERSION}")
+endif()
+if(FALCO_VERSION_BUILD STREQUAL "${FALCO_VERSION}")
+  set(FALCO_VERSION_BUILD "")
+endif()
+
+message(STATUS "Falco version: ${FALCO_VERSION}")