# Copyright (c) PLUMgrid, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
if(NOT REVISION)
  get_git_head_revision(GIT_REFSPEC GIT_SHA1)
  string(SUBSTRING "${GIT_SHA1}" 0 8 GIT_SHA1_SHORT)
  git_describe(GIT_DESCRIPTION)
  git_describe(GIT_TAG_LAST "--abbrev=0" "--tags")
  git_get_exact_tag(GIT_TAG_EXACT)
  string(SUBSTRING "${GIT_TAG_LAST}-${GIT_SHA1_SHORT}" 1 -1 REVISION)
  if(GIT_TAG_EXACT)
    string(SUBSTRING "${GIT_TAG_EXACT}" 1 -1 REVISION)
    message(STATUS "Currently on Git tag ${GIT_TAG_EXACT}")
  else ()
    message(STATUS "Latest recognized Git tag is ${GIT_TAG_LAST}")
    set(GIT_TAG_EXACT "")
  endif()
  message(STATUS "Git HEAD is ${GIT_SHA1}")
  # rpm/deb packaging uses this, only works on whole tag numbers
  if(NOT REVISION_LAST)
    string(SUBSTRING "${GIT_TAG_LAST}" 1 -1 REVISION_LAST)
  endif()
else()
  set(REVISION_LAST "${REVISION}")
endif()

# strip leading 'v', and make unique for the tag
message(STATUS "Revision is ${REVISION}")