Pre-compile Assets and Cache for CircleCI

.circleci_config.yml

      - restore_cache:
          keys:
            - v1-asset-cache-{{ arch }}-{{ .Branch }}
            - v1-asset-cache-

      - run: bundle exec rake assets:precompile

      - save_cache:
          key: v1-asset-cache-{{ arch }}-{{ .Branch }}-{{ epoch }}
          paths:
            - public/assets
            - tmp/cache/assets/sprockets

yep, BuildNum also works, any incremental counter. arch is from the CircleCI default example.

this is an old snippet, some updates you can find here https://github.com/jetthoughts/jt_tools/blob/master/lib/install/.circleci/config.yml

I extracted all such tips into a rails app generator

you can cache even bootsnap and other stuff

Oh, I remember, why I moved to SHA1, in order to not run assets precompilation on re-run

Good to know, thanks. My example above with branch-revision should do mostly the same. At least I observe that on re-run it catch the latest branch cache.

update: I ended up hashing all files which may cause assets change and do exact match. Better not to reuse partial cache to avoid bloat and unexpected issues for little if any perf gain. Hashing with the following command git ls-tree HEAD $(<.circleci/asset_paths) > tmp/assets_related_checksums, then using key v1-asset-cache-{{ checksum "tmp/assets_related_checksums" }}.

For full PR you can see 3scale/porta#2630