anchor.diff:  WORKDIR /opt
   
   ARG MOOSE_JOBS=1
  +
  +#-----------------------------------------------------------------------------#
  +# Add user dev
  +#-----------------------------------------------------------------------------#
  +RUN useradd dev ; \
  +mkdir -p /home/dev/.ssh ; \
  +chmod 700 /home/dev/.ssh ; \
  +chown -R dev:dev /home/dev
   
   #-----------------------------------------------------------------------------#
   # Install managed packages and clear cache
  
positive.code: #-----------------------------------------------------------------------------#
  # Copy and build MOOSE framework and tests
  #-----------------------------------------------------------------------------#
  COPY . ${MOOSE_DIR}
  RUN cd test ; make -j ${MOOSE_JOBS}
  
  #-----------------------------------------------------------------------------#
  # Add needed env vars to /etc/environment
  
negative.code: ARG LIBMESH_REV
  ENV LIBMESH_DIR=/usr/local \
  libmesh_CPPFLAGS="-D LIBMESH_HAVE_XDR"
  
  COPY scripts/update_and_rebuild_libmesh.sh ${MOOSE_DIR}/scripts/update_and_rebuild_libmesh.sh
  
  RUN git clone https://github.com/libMesh/libmesh.git ; \
  cd libmesh ; \
  git checkout ${LIBMESH_REV} ; \
  