anchor.diff:      find /tftpboot -type f -exec chmod 0444 {} + && \
       apk del --no-cache sl_plus_deps
   
  +RUN adduser -D user
  +COPY . /home/user/
  +
  +USER user
  +RUN /home/user/build.sh
  +
  +################################################################################
  +# Runtime image.
  +################################################################################
  +FROM alpine:3.7
  +
  +# CA certs are important if you add a hook for https.
  +COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
  +
  +# Add the static binary.
  +COPY --from=builder /tmp/hooktftp /usr/bin/
  +
  +# Add a trivial config that can be overridden at runtime.
  +COPY hooktftp.yml /etc/hooktftp/hooktftp.yml
  +VOLUME /etc/hooktftp
  +
  +# Publish the typical syslinux and pxelinux files at tftp root.
  +COPY --from=builder /tftpboot /tftpboot
  +
   # Add safe defaults that can be overriden easily.
   COPY pxelinux.cfg /tftpboot/pxelinux.cfg/
   
  
positive.code: RUN apk add --no-cache -X http://dl-4.alpinelinux.org/alpine/edge/community \
        'go>=1.10'
  
  RUN adduser -D user
  COPY . /home/user/
  
  USER user
  RUN /home/user/build.sh
  
  ################################################################################
  # Runtime image.
  ################################################################################
  FROM alpine:3.7
  
  # CA certs are important if you add a hook for https.
  RUN apk add --no-cache \
        ca-certificates \
        file
  
  # Add the static binary.
  COPY --from=builder /tmp/hooktftp /usr/bin/
  
  # Add a trivial config that can be overridden at runtime.
  COPY hooktftp.yml /etc/hooktftp/hooktftp.yml
  VOLUME /etc/hooktftp
  
  # Publish the typical syslinux and pxelinux files at tftp root.
  # We only need one subtree of files from syslinux, and
  # we don't need its dependencies, so...
  #
  
negative.code: RUN apk add --no-cache \
        busybox-extras \
        bzr \
        ca-certificates \
        git \
        make \
        gcc \
  