Choosing Go version when using CNB Tiny

1

I’m using the CNB Tiny buildpack, but it seems to use Go 1.14 even if my mod file specifies 1.15. I’m seeing the following output:

[builder] Paketo Go Distribution Buildpack 0.1.0
[builder]   Resolving Go version
[builder]     Candidate version sources (in priority order):
[builder]       <unknown> -> ""
[builder]       <unknown> -> ""
[builder] 
[builder]     Selected Go version (using <unknown>): 1.14.7
[builder] 
[builder]   Executing build process
[builder]     Installing Go 1.14.7
[builder]       Completed in 4.576s
[builder] 
[builder] Paketo Go Mod Vendor Buildpack 0.0.164
[builder]   Executing build process
[builder]     Running 'go mod vendor'
[builder]       Completed in 4.901s
[builder] 
[builder] Paketo Go Build Buildpack 0.0.32
[builder]   Executing build process
[builder]     Running 'go build -o /layers/paketo-buildpacks_go-build/targets/bin -buildmode pie -mod vendor .'
[builder]       Completed in 11.917s
[builder]

Is there a way to set the Go version manually or have it respect the go.mod file?

2

Re respecting the go.mod version, that’s an outstanding issue on the go buildpack - https://github.com/paketo-buildpacks/go-dist/issues/102

The default Go on the go-dist buildpack component is currently defaulted to 1.14. https://github.com/paketo-buildpacks/go-dist/releases

I’ll look into it and see what can be done.

3

Ok,

add a buildpack.yml file with

go:
  version=1.15

And that should get you building with 1.15

4

The yaml should be

go:
  version: 1.15

not =, but works great, thanks :+1:

5

Ach! Fixed… I blame too many configuration file formats. :slight_smile: