Snippet to set a sensible fallback value for major.minor.patch

CMakeLists.txt

# We haven't received version information via the packaging setup.
# For that, we try to determine sensible values on our own, ensuring
# plain old invocations to cmake still work as expected.
if (NOT DEFINED TRUST_STORE_VERSION_MAJOR)
  find_program(LSB_RELEASE lsb_release)
  execute_process(
    COMMAND ${LSB_RELEASE} -c -s
    OUTPUT_VARIABLE DISTRO_CODENAME
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  # We explicitly ignore errors and only check if we are building for vivid.
  # For all other cases:
  #   - releases other than vivid
  #   - other distros
  #   - errors
  # we define the version to be 2.0.0
  if (${DISTRO_CODENAME} STREQUAL "vivid")
    set(TRUST_STORE_VERSION_MAJOR 1)
    set(TRUST_STORE_VERSION_MINOR 1)
    set(TRUST_STORE_VERSION_PATCH 0)
  else ()
    set(TRUST_STORE_VERSION_MAJOR 2)
    set(TRUST_STORE_VERSION_MINOR 0)
    set(TRUST_STORE_VERSION_PATCH 0)
  endif()
endif()

message(STATUS "${CMAKE_PROJECT_NAME} ${TRUST_STORE_VERSION_MAJOR}.${TRUST_STORE_VERSION_MINOR}.${TRUST_STORE_VERSION_PATCH}")