execute_process(
  COMMAND git describe --tags --always --dirty
  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
  OUTPUT_VARIABLE NINLIGHT_FW_VERSION
  OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
if(NOT NINLIGHT_FW_VERSION)
  set(NINLIGHT_FW_VERSION "0.0.0-dev")
endif()
string(REGEX REPLACE "^v" "" NINLIGHT_FW_VERSION "${NINLIGHT_FW_VERSION}")
# The OTA trailer reserves 16 bytes incl. terminator for the version.
string(SUBSTRING "${NINLIGHT_FW_VERSION}" 0 15 NINLIGHT_FW_VERSION)
string(TIMESTAMP NINLIGHT_BUILD_DATE "%Y-%m-%d")