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go-tool-cache

Like Go's built-in build/test caching but wish it weren't purely stored on local disk in the $GOCACHE directory?

Want to share your cache over the network between your various machines, coworkers, and CI runs without all that GitHub actions/caches tarring and untarring?

Along with a modification to Go's cmd/go tool (open proposal), this repo lets you write custom GOCACHE implementations to handle the cache however you'd like.

Status

Currently you need to build your own Go toolchain to use this. As of 2023-04-24 it's still an open proposal & work in progress.

Using

First, build your cache child process. For example,

$ go install github.com/bradfitz/go-tool-cache/cmd/go-cacher

Then tell Go to use it:

$ GOCACHEPROG=$HOME/go/bin/go-cacher go install std

See some stats:

$ GOCACHEPROG="$HOME/go/bin/go-cacher --verbose" go install std
Defaulting to cache dir /home/bradfitz/.cache/go-cacher ...
cacher: closing; 548 gets (0 hits, 548 misses, 0 errors); 1090 puts (0 errors)

Run it again and watch the hit rate go up:

$ GOCACHEPROG="$HOME/go/bin/go-cacher --verbose" go install std
Defaulting to cache dir /home/bradfitz/.cache/go-cacher ...
cacher: closing; 808 gets (808 hits, 0 misses, 0 errors); 0 puts (0 errors)

S3 Support

We support S3 backend for caching. You can connect to S3 backend by setting the following parameters:

  • GOCACHE_S3_BUCKET - Name of S3 bucket
  • GOCACHE_AWS_REGION - AWS Region of bucket
  • GOCACHE_AWS_ACCESS_KEY + GOCACHE_AWS_SECRET_KEY / GOCACHE_AWS_CREDS_PROFILE - Direct credentials or creds profile to use.
  • GOCACHE_CACHE_KEY - (Optional, default v1) Unique key

The cache would be stored to s3://<bucket>/cache/<cache_key>/<architecture>/<os>/<go-version>

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