<p>With the option being repeated 4 times (out of the 5 usage of <code>-v</code>) in the file, putting it in common would be better. It is not really clean code to have hardwritten values in the middle :)</p>
<p>Adding a <code>docker_volume ?= -v '$1:$2$(DOCKER_MOUNT_OPTION)'</code> function used everywhere and documenting <code>DOCKER_VOLUME_OPTION ?= :delegated</code> would be cool.</p>

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