title: Unable to replace files in docker image with ADD or COPY
body: <p>I am trying to replace some files in a folder in a docker image. I am using the following command inside <code>Dockerfile</code>:</p>
  
  <pre><code>COPY /home/adietz/Work/20_BSP/Jenkins/venvs/linux_selenium/lib/python2.7/site-packages/browsermobproxy /usr/local/lib/python2.7/dist-packages/browsermobproxy
  </code></pre>
  
  <p>which results in an error</p>
  
  <pre><code>Step 4/12 : COPY /home/adietz/Work/20_BSP/Jenkins/venvs/linux_selenium/lib/python2.7/site-packages/browsermobproxy /usr/local/lib/python2.7/dist-packages/browsermobproxy
  lstat home/adietz/Work/20_BSP/Jenkins/venvs/linux_selenium/lib/python2.7/site-packages/browsermobproxy: no such file or directory
  </code></pre>
  
  <p>Replacing <code>COPY</code> with <code>ADD</code> results in the same error. Also the following command</p>
  
  <pre><code>COPY /home/adietz/Work/20_BSP/Jenkins/venvs/linux_selenium/lib/python2.7/site-packages/browsermobproxy /usr/local/lib/python2.7/dist-packages/
  </code></pre>
  
  <p>and gives identical(!) error.</p>
  
  <p>Both paths are <strong>folders</strong>. The folder in the docker image already exists; I just want to replace the files. </p>
  
  <p>What am I doing wrong here...?</p>