docker - build fails when COPYing file to root
<p>I'm getting a docker build error when I try to add a shell script to the root directory (/entrypoint.sh)</p>

<p>Dockerfile:</p>

<pre><code>FROM ubuntu:trusty
COPY ./entrypoint.sh /
ENTRYPOINT ["/entrypoint.sh"]
</code></pre>

<p>Output:</p>

<pre><code>Sending build context to Docker daemon 3.072 kB
Step 1 : FROM ubuntu:trusty
 ---&gt; 1e0c3dd64ccd
Step 2 : COPY ./entrypoint.sh /
stat /var/lib/docker/aufs/mnt/5570570a77deddea426b95bd0f706beff4b5195a2fba4a8f70dcac4671bca225/entrypoint.sh: no such file or directory
</code></pre>

<p>The file is present at the root of the build context, and when I change / to a subdirectory such as /opt/, it works. Any idea what could be going wrong?</p>