mirror of https://github.com/ekimekim/wubloader
Add ability to explicitly pull and re-use layers from other commits when building
This is intended mainly for travis CI, because by default it doesn't cache any layers between builds. By pulling likely-reusable builds (all parents of the current commit), we take a fixed cost slowdown but in many cases should see a dramatic speed increase overall, since we won't need to re-build anything that hasn't changed. This isn't needed for local builds, where docker will do this on its own with any previously-built images.pull/153/head
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