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Requirements & Dependencies
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<p>Home Assistant allows components and platforms to specify their dependencies and requirements using the variables <code class="highlighter-rouge">DEPENDENCIES</code> and <code class="highlighter-rouge">REQUIREMENTS</code>. Both are lists that contain strings.</p>
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<h2><a class="title-link" name="dependencies" href="#dependencies"></a> Dependencies</h2>
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<p>Dependencies are other Home Assistant components that should be setup before the platform is loaded. An example is the MQTT sensor component, which requires an active connection to an MQTT broker. If Home Assistant is unable to load and setup the MQTT component, it will not setup the MQTT sensor component.</p>
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<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="n">DEPENDENCIES</span> <span class="o">=</span> <span class="p">[</span><span class="s">'mqtt'</span><span class="p">]</span>
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</code></pre>
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<h2><a class="title-link" name="requirements" href="#requirements"></a> Requirements</h2>
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<p>Requirements are Python libraries or modules that you would normally install using <code class="highlighter-rouge">pip</code> for your component. Home Assistant will try to install the requirements into the <code class="highlighter-rouge">deps</code> subdirectory of the Home Assistant <a href="/docs/configuration/">configuration directory</a> if you are not using a <code class="highlighter-rouge">venv</code> or in something like <code class="highlighter-rouge">path/to/venv/lib/python3.6/site-packages</code> if you running in a virtual environment. This will make sure that all requirements are present at startup. If steps fails like missing packages for the compilation of a module or other install errors, the component will fail to load.</p>
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<p>Requirements is a list of strings. Each entry is a <code class="highlighter-rouge">pip</code> compatible string. For example, the media player Cast platform depends on the Python package PyChromecast v0.6.12:</p>
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<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="n">REQUIREMENTS</span> <span class="o">=</span> <span class="p">[</span><span class="s">'pychromecast==0.6.12'</span><span class="p">]</span>
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</code></pre>
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<p>During development of a component, it can be useful to test against different versions of a requirement. This can be done in two steps, using pychromecast as an example:</p>
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<ul>
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<li><code class="highlighter-rouge">pip install pychromecast==0.6.13 --target ~/.homeassistant/deps</code></li>
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<li><code class="highlighter-rouge">hass --skip-pip</code></li>
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<p>This will use the specified version, and prevent Home Assistant from trying to override it with what is currently in <code class="highlighter-rouge">REQUIREMENTS</code>.</p>
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<p>If you need to make changes to a requirement to support your component, it’s also possible to <code class="highlighter-rouge">pip install</code> from a checkout of the requirement.</p>
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<li><code class="highlighter-rouge">git clone https://github.com/balloob/pychromecast.git</code></li>
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<li><code class="highlighter-rouge">pip install ./pychromecast</code></li>
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<li><code class="highlighter-rouge">hass --skip-pip</code></li>
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