Travis builds fail for tip version - use stable instead

[pawelprazak]

All recent builds fail in a weird way:

$ staticcheck $(go list ./... | grep -v vendor)
/home/travis/gopath/src/github.com/jessfraz/reg/vendor/github.com/docker/docker/registry/session.go:572:32: cannot use tarsumLayer (variable of type github.com/jessfraz/reg/vendor/github.com/docker/docker/pkg/tarsum.TarSum) as io.Reader value in argument to io.TeeReader: missing method Read
couldn't load packages due to errors: github.com/jessfraz/reg/vendor/github.com/docker/docker/registry
The command "staticcheck $(go list ./... | grep -v vendor)" exited with 1.

I was not able to reproduce it locally. But from what I can gather, tip == master:
travis-ci/gimme#110
travis-ci/travis-build@b114b18#diff-fe52d3b67e8fe283d39c20d2b87d82f8

Moreover, the docs doesn't mention tip at all, there's only 1.x and master.

So IMHO something like this would be better / more stable, e.g.:

...
go:
  - 1.x
  - master
matrix:
  allow_failures:
    - go: master
  fast_finish: true
...
    on:
      go: 1.x
...

[pawelprazak]

I've reproduced it locally:

docker run --rm -v "$PWD":/go/src/github.com/jessfraz/reg --workdir /go/src/github.com/jessfraz/reg -v /tmp:/tmp reg-gimme:latest make init staticcheck
go version devel +07f0f09563 Fri Feb 16 15:37:57 2018 +0000 linux/amd64
+ init
go get -u honnef.co/go/tools/cmd/staticcheck
+ staticcheck
/go/src/github.com/jessfraz/reg/vendor/github.com/docker/docker/registry/session.go:572:32: cannot use tarsumLayer (variable of type github.com/jessfraz/reg/vendor/github.com/docker/docker/pkg/tarsum.TarSum) as io.Reader value in argument to io.TeeReader: missing method Read
couldn't load packages due to errors: github.com/jessfraz/reg/vendor/github.com/docker/docker/registry

With a custom gimme image set to tip version.

[pawelprazak]

I've tried the 1.x version with mixed results: https://travis-ci.org/pawelprazak/reg/jobs/342529887

Deployment hasn't triggered:

Skipping a deployment with the releases provider because this is not on the required runtime

[pawelprazak]

Using the undocumented stable version (resolved to go1.9.4) gives the expected result:
https://travis-ci.org/pawelprazak/reg/jobs/342534715

[pawelprazak]

@jessfraz any thoughts on this?

[jessfraz]

Thanks for going into so much detail, ya this happening on like 30 of my projects because I share the same travis config. I will fix

[jessfraz]

fixed by 533d292

[pawelprazak]

I hate when CI is red ;) also reverse-engineering is so much fun