cmd/go: tell go install to install deps from a certain github.com org first

[ORESoftware]

We sometimes have to wait for a long time for 3rd party libs to install before our org's dependencies are installed. Since our deps change all the time, but the 3rd party libs are more static, we want a fail fast methodology to be in place - and install our deps first.

One idea is to have two separate go.mod files or contents. Copy our org's deps to one, go install, and then install 3rd party libs as a second step. Might that work?

[ianlancetaylor]

CC @bcmills @jayconrod

[bcmills]

Since the go command now requires a build cache, running go install on library dependencies should be unnecessary anyway.

Moreover, since the go command now requires a build cache, the static third-party libraries should take essentially no time to install when they are unchanged. Can you give some more detail about why that caching is not effective for your use-case?

[ORESoftware]

cache is not good bc we are in dockerfile / docker build

[bcmills]

Docker is capable of saving caches. (You can relocate the Go build cache to a specific location for later reuse by setting the GOCACHE environment variable.)

See the discussion on #27719.

[ORESoftware]

yes but of course I am taking about the very first call to go mod download or go install not the subsequent calls. roger?

[bcmills]

If you save the cache, “the very first” call happens only ~once (perhaps once per Go release?), the first time you set up the Docker image. Why is it important to have fail-fast behavior for something that happens so infrequently?

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