synapse/changelog.d/9610.docker at fc53a606e4ee7d94e2fadfb00d19b7e8e21699ad - MirrorHub/synapse - tilera Git

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Eric Eastwood 0a778c135f

Make pip install faster in Docker build for Complement testing (#9610 )

Make pip install faster in Docker build for [Complement](https://github.com/matrix-org/complement) testing.

If files have changed in a `COPY` command, Docker will invalidate all of the layers below. So I changed the order of operations to install all dependencies before we `COPY synapse /synapse/synapse/`. This allows Docker to use our cached layer of dependencies even when we change the source of Synapse and speed up builds dramatically! `53.5s` -> `3.7s` builds 🤘

As an alternative, I did try using BuildKit caches but this still took 30 seconds overall on that step. 15 seconds to gather the dependencies from the cache and another 15 seconds to `Installing collected packages`.

Fix https://github.com/matrix-org/synapse/issues/9364

2021-03-26 18:42:58 +00:00

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Speed up Docker builds and make it nicer to test against Complement while developing (install all dependencies before copying the project).