unset GIT_PREVIOUS_COMMIT GIT_URL GIT_PREVIOUS_SUCCESSFUL_COMMIT GIT_BRANCH GIT_COMMIT
# this may be set by user
unset GIT_SSH
+ # may be set by user
+ unset GIT_COMMITTER_NAME GIT_COMMITTER_EMAIL GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
# fail if something still set
env | grep ^GIT_ && Exit_error err_build_fail