anchor.diff:  ' > /root/requirements.txt && pip install --upgrade -r /root/requirements.txt && rm /root/requirements.txt && rm -rf /root/.cache/pip
   
   
  -# always need /etc/environment for IXIA and TCL vars
  -COPY docker_environment_variables /etc/environment
  -
   ARG TAF_ROOT=/root/taf
   # copy TAF repo to docker image
   COPY /  $TAF_ROOT/
  
positive.code: 
  
  # copy TRex client API library
  ARG TREX_VERSION=v2.00
  ARG TREX_TMP_PATH=/tmp/trex
  ARG TREX_WEB_URL=http://trex-tgn.cisco.com/trex/release
  ENV TREX_CLIENT_LIB=/opt/trex_client/stl
  
negative.code: 
  # define proxy environment variables to build image
  # if environment requires
  #ENV http_proxy='http://<proxy server>:<port>'
  #ENV https_proxy='http://<proxy server>:<port>'
  #ENV ftp_proxy='http://<proxy server>:<port>'
  #ENV socks_proxy='socks://<proxy server>:<port>'
  #ENV no_proxy='localhost,127.0.0.1,.<example.com>'
  
  # create apt proxy
  #RUN echo 'Acquire::http::Proxy "<proxy server>";' >>/etc/apt/apt.conf.d/20proxy
  