From 85a94d67d3e248a34db67ed54cdad1040d88cdea Mon Sep 17 00:00:00 2001
From: Leonardo Di Donato <leodidonato@gmail.com>
Date: Tue, 16 Jul 2019 16:12:58 +0200
Subject: [PATCH] build: falco version from git index when not defined

Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>
---
 CMakeLists.txt | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d790f911..ee9cdfb0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,10 +21,6 @@ project(falco)
 
 option(BUILD_WARNINGS_AS_ERRORS "Enable building with -Wextra -Werror flags")
 
-if(NOT DEFINED FALCO_VERSION)
-	set(FALCO_VERSION "0.1.1dev")
-endif()
-
 if(NOT DEFINED FALCO_ETC_DIR)
 	set(FALCO_ETC_DIR "/etc/falco")
 endif()
@@ -79,6 +75,30 @@ if(NOT SYSDIG_DIR)
 	set(SYSDIG_DIR "${PROJECT_SOURCE_DIR}/../sysdig")
 endif()
 
+# Add path for custom CMake modules
+list(APPEND CMAKE_MODULE_PATH
+	"${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
+
+# Add path for custom CMake modules used to build dependencies from Sysdig (libscap, libsinsp)
+list(APPEND CMAKE_MODULE_PATH
+	"${SYSDIG_DIR}/cmake/modules")
+
+# Create the falco version variable according to git index
+if(NOT DEFINED FALCO_VERSION)
+	include(GetGitRevisionDescription)
+	git_get_exact_tag(FALCO_TAG)
+	if(NOT FALCO_TAG)
+		git_describe(FALCO_VERSION "--always")
+		git_local_changes(FALCO_CHANGES)
+		if(FALCO_CHANGES STREQUAL "DIRTY")
+			string(TOLOWER "${FALCO_CHANGES}" FALCO_CHANGES)
+			set(FALCO_VERSION "${FALCO_VERSION}-${FALCO_CHANGES}")
+		endif()
+	else()
+		set(FALCO_VERSION "${FALCO_TAG}")
+	endif()
+endif()
+
 # make luaJIT work on OS X
 if(APPLE)
 	set(CMAKE_EXE_LINKER_FLAGS "-pagezero_size 10000 -image_base 100000000")
@@ -606,14 +626,6 @@ add_subdirectory(test)
 add_subdirectory(rules)
 add_subdirectory(docker)
 
-# Add path for custom CMake modules used to build dependencies from Sysdig (libscap, libsinsp)
-list(APPEND CMAKE_MODULE_PATH
-	"${SYSDIG_DIR}/cmake/modules")
-
-# Add path for custom CMake modules
-list(APPEND CMAKE_MODULE_PATH
-	"${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
-
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")
 	add_subdirectory("${SYSDIG_DIR}/driver" "${PROJECT_BINARY_DIR}/driver")
 	include(FindMakedev)