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Last active January 3, 2017 20:25
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trigger-docker-build.md

Trigger Docker Build from 3rd-party Github Repo Push

Docker Hub allows you to automate builds from your own repo. They also allow builds to be triggered when existing Docker images are updated.

My image depends on Ubuntu (tracked via Docker), Node (tracked via Docker) and Kosmtik. Since there isn't an official Kosmtik image, Docker Hub doesn't have to trigger new builds when the repo is updated. Enter IFTTT. Although the service was massively downgraded when they pivoted towards "Applets" 🤔 -- most of the original functionality is now in the Maker service.

Using the Feed service to subscribe to a Github repo's commit log:

https://github.com/<username>/<repo>/commits/master.atom

We can trigger builds by firing a POST at Docker Hub's Build webhook! 🎉

https://registry.hub.docker.com/u/<username>/<repo>/trigger/<key>/

Disclaimer: Feeds are polled by IFTTT and might be delayed up to an hour. Docker Hub Build triggers are rate-limited, if a current build is in progress, new pushes are ignored.

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