esp-idf/tools/cmake/git_submodules.cmake

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CMake
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find_package(Git)
if(NOT GIT_FOUND)
message(WARNING "Git executable was not found. Git submodule checks will not be executed. "
"If you have any build issues at all, start by adding git executable to the PATH and "
"rerun cmake to not see this warning again.")
function(git_submodule_check root_path)
# no-op
endfunction()
else()
function(git_submodule_check root_path)
# for internal use:
# skip submodule check if running on Gitlab CI and job is configured as not clone submodules
if($ENV{IDF_SKIP_CHECK_SUBMODULES})
if($ENV{IDF_SKIP_CHECK_SUBMODULES} EQUAL 1)
message("skip submodule check on internal CI")
return()
endif()
endif()
execute_process(
COMMAND ${GIT_EXECUTABLE} submodule status
WORKING_DIRECTORY ${root_path}
OUTPUT_VARIABLE submodule_status
)
# git submodule status output not guaranteed to be stable,
# may need to check GIT_VERSION_STRING and do some fiddling in the
# future...
lines2list(submodule_status)
foreach(line ${submodule_status})
string(REGEX MATCH "(.)[0-9a-f]+ ([^\( ]+) ?" _ignored "${line}")
set(status "${CMAKE_MATCH_1}")
set(submodule_path "${CMAKE_MATCH_2}")
if("${status}" STREQUAL "-") # missing submodule
message(STATUS "Initialising new submodule ${submodule_path}...")
execute_process(
COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive ${submodule_path}
WORKING_DIRECTORY ${root_path}
RESULT_VARIABLE git_result
)
if(git_result)
message(FATAL_ERROR "Git submodule init failed for ${submodule_path}")
endif()
elseif(NOT "${status}" STREQUAL " ")
message(WARNING "Git submodule ${submodule_path} is out of date. Run the following command to fix: "
"git submodule update --init --recursive")
endif()
# Force a re-run of cmake if the submodule's .git file changes or is changed (ie accidental deinit)
get_filename_component(submodule_abs_path ${submodule_path} ABSOLUTE BASE_DIR ${root_path})
set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${submodule_abs_path}/.git)
# same if the HEAD file in the submodule's directory changes (ie commit changes).
# This will at least print the 'out of date' warning
set(submodule_head "${root_path}/.git/modules/${submodule_path}/HEAD")
if(EXISTS "${submodule_head}")
set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${submodule_head})
endif()
endforeach()
endfunction()
endif()