fs.Version to support version constrained binary discovery

[magodo]

Allows users to optionally specify one or more (comma separated) version constraints for fs.AnyVersion source.

[radeksimko]

Hi @magodo
Just for consistency with other parts of our API, in particular the sources under releases package - e.g. https://pkg.go.dev/github.com/hashicorp/hc-install@v0.3.1/releases#LatestVersion would you mind exposing this as a new fs.Version source instead of modifying fs.AnyVersion?

Aside from the name communicating better what the source represents we also wouldn't need to deal with conflicts with ExactBinPath.

[magodo]

@radeksimko That is what I did at the first try :) But I didn't come up with a good name for that. Do you have any suggestion about the naming?

[magodo]

@radeksimko A kindly ping, would you mind provide a suitable name for the new source?

[radeksimko]

@magodo I already proposed the new name in my original comment 😉

would you mind exposing this as a new fs.Version source instead of modifying fs.AnyVersion?

[magodo]

@radeksimko Ah, sorry 🙈. I've made a new commit to implement the fs.Version source, please let me know if anything else is needed.

[radeksimko]

Thanks!

I left you an in-line comment regarding the tests - otherwise the implementation LGTM.

[radeksimko]

This is looking pretty good, I just left one suggestion, effectively re-enabling the test. Aside from that I think you may need to rebase your branch, to bring in #57

Then once tests are passing I'm happy to approve and merge.

[magodo]

@radeksimko I've updated the test and merged with main branch. The test is passing now:

❯ E2E_TESTING=1 go test -v -run="^TestVersion$" ./...
=== RUN   TestVersion
--- PASS: TestVersion (7.79s)
PASS
ok      github.com/hashicorp/hc-install/fs      7.795s