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app: Add example of VERSION file tracking git index file #92

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24 changes: 24 additions & 0 deletions app/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -10,3 +10,27 @@ find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
project(app LANGUAGES C)

target_sources(app PRIVATE src/main.c)

# The code below locates the git index file for this repository and adds it as a dependency for
# the application VERSION file so that if the repo has a new commit added, even if no files in
# the build have changed, the application version file will be regenerated with the new git commit
find_package(Git QUIET)
if(GIT_FOUND)
execute_process(
COMMAND ${GIT_EXECUTABLE} rev-parse --absolute-git-dir
WORKING_DIRECTORY .
OUTPUT_VARIABLE application_git_dir
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE stderr
RESULT_VARIABLE return_code)
# If there is an error e.g. it is not a git repo, we just silently ignore it and continue
# without a dependency, this will be the case with freestanding applications.
if(NOT return_code)
if(NOT "${stderr}" STREQUAL "")
message(WARNING "APPLICATION_BUILD_VERSION: git rev-parse warned: ${stderr}")
endif()

set_property(TARGET app_version_h PROPERTY APP_VERSION_DEPENDS ${application_git_dir}/index)
endif()
endif()
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