cmake: Add hook to checkout submodules

Related-to: #126
Signed-off-by: Siddharth Chandrasekaran <[email protected]>

.editorconfig

@@ -8,6 +8,6 @@ indent_style = tab
 indent_size = 8
 
 # 4 space indentation
-[*.{py.in,py,md}]
+[*.{py.in,py,md,cmake}]
 indent_style = space
 indent_size = 4

CMakeLists.txt

@@ -37,6 +37,7 @@ option(CONFIG_OSDP_STATIC_PD "Setup PD single statically" OFF)
 option(CONFIG_OSDP_LIB_ONLY "Only build the library" OFF)
 
 # Each subdirectory has it's own CMakeLists.txt
+include(GitSubmodules)
 add_subdirectory(utils)
 add_subdirectory(src)
 if (NOT CONFIG_OSDP_STATIC_PD AND NOT CONFIG_OSDP_LIB_ONLY)

cmake/GitSubmodules.cmake

@@ -0,0 +1,23 @@
+#
+#  Copyright (c) 2020-2023 Siddharth Chandrasekaran <[email protected]>
+#
+#  SPDX-License-Identifier: Apache-2.0
+#
+
+find_package(Git QUIET)
+
+if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
+    message(STATUS "Submodule update")
+    execute_process(
+        COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+        RESULT_VARIABLE GIT_SUBMOD_RESULT
+    )
+    if(NOT GIT_SUBMOD_RESULT EQUAL "0")
+        message(FATAL_ERROR "git submodule update --init --recursive failed with ${GIT_SUBMOD_RESULT}, please checkout submodules")
+    endif()
+endif()
+
+if(NOT EXISTS "${PROJECT_SOURCE_DIR}/utils/CMakeLists.txt")
+    message(FATAL_ERROR "The submodules were not downloaded! GIT_SUBMODULE was turned off or failed. Please update submodules and try again.")
+endif()