From 64144ec9b691a9c3e0e2b6f69c518c2ab3a7192d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrick=20Jos=C3=A9=20Pereira?= <patrickelectric@gmail.com>
Date: Wed, 15 Jan 2020 21:43:58 -0300
Subject: [PATCH] cmake: Add Git module
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Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>
---
 cmake/Git.cmake | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 cmake/Git.cmake

diff --git a/cmake/Git.cmake b/cmake/Git.cmake
new file mode 100644
index 000000000..8dbebcde8
--- /dev/null
+++ b/cmake/Git.cmake
@@ -0,0 +1,25 @@
+find_package(Git)
+
+if(NOT GIT_FOUND OR NOT EXISTS "${PROJECT_SOURCE_DIR}/.git")
+    return()
+endif()
+
+# Update submodules as needed
+option(GIT_SUBMODULE "Check submodules during build" ON)
+if(NOT GIT_SUBMODULE)
+    return()
+endif()
+
+message(STATUS "Submodule update")
+execute_process(COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive
+                WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+                RESULT_VARIABLE GIT_SUBMODULE_RESULT)
+if(NOT GIT_SUBMODULE_RESULT EQUAL "0")
+    message(FATAL_ERROR "git submodule update --init failed with ${GIT_SUBMODULE_RESULT}, please checkout submodules")
+endif()
+
+# Fetch the necessary git variables
+execute_process(COMMAND ${GIT_EXECUTABLE} describe --always --tags
+                WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                OUTPUT_VARIABLE GIT_VERSION
+                OUTPUT_STRIP_TRAILING_WHITESPACE)
-- 
2.22.0