Version not returned when using go installer

[nvuillam]

Hi, thanks for your work on your great linter , that we embedded within MegaLinter !

In our Dockerfile, we have the following line to get the latest version of KubeConform

RUN go install github.com/yannh/kubeconform/cmd/kubeconform@latest

We have an automated CI job that upgrades linters and writes their version in online documentation, and kubeconform always returns "development".

Is there some workaround, like maybe a different installation command for Alpine linux, or maybe it is a bug ?

To reproduce:

$ go install github.com/yannh/kubeconform/cmd/kubeconform@latest
$ kubeconform -v
development

Thanks & best regards !

[yannh]

Hi @nvuillam ! The version is injected at build time by overriding this variable https://github.com/yannh/kubeconform/blob/ce2f6de185c210d5237e57261b93bd33b7ff0bc6/cmd/kubeconform/main.go#L18 , in goreleaser, here: https://github.com/yannh/kubeconform/blob/ce2f6de185c210d5237e57261b93bd33b7ff0bc6/.goreleaser.yml#L24

This is passed to go build as a -ldflags parameter. I am not sure if you can pass that parameter using go install as well? :thinking:

EDIT: Yup

yann@yann-thinkpad:~$ go install -ldflags "-X 'main.version=foo'" github.com/yannh/kubeconform/cmd/kubeconform@v0.4.13 
yann@yann-thinkpad:~$ /home/yann/go/bin/kubeconform -v
foo

Does this help? Best, Yann

[nvuillam]

Thanks for the quick reply :)

I'm unfortunately not expert in go, I'm just the linter guy ^^

I need a command that will always install the latest version of kubeconform on an alpine linux base dockerfile (without knowing the number of the latest version), then be able to retrieve the version number by calling kubeconform -v , is there a way to do it ? :)

It can also work with a COPY from another alpine-based docker image that would be up to date with latest kubeconform version

[yannh]

When you install like this "go install github.com/yannh/kubeconform/cmd/kubeconform@latest" you install the latest master, which is the development version, so this is behaving as expected :bow: If you want to install a specific version, you would need to go install at a particular tag, eg:

go install -ldflags "-X 'main.version=v0.4.13'" github.com/yannh/kubeconform/cmd/kubeconform@v0.4.13

You might need a bit of bash to figure out what that tag might be. Docker images are published here: https://github.com/yannh/kubeconform/pkgs/container/kubeconform , latest here would point to the latest tagged version.

[nvuillam]

I see you publish a latest-alpine, it seems to be exactly what I'm looking for :)

https://github.com/yannh/kubeconform/pkgs/container/kubeconform/73554889?tag=latest-alpine

FROM ghcr.io/yannh/kubeconform:latest-alpine as kubeconform
COPY --link --from=kubeconform /bin/kubeconform /usr/bin/

Would that work ? :)

[yannh]

That should work yes :+1:

[nvuillam]

@yannh I have the following error... maybe you could direct me to the appropriate folder(s) to copy, as it seems it is not /bin/kubeconform ?

 > [stage-18 15/50] COPY --link --from=kubeconform /bin/kubeconform /usr/bin/:
------
ERROR: failed to solve: failed to compute cache key: failed to calculate checksum of ref y758aaqmsou52b3qygl48tttz::lixznodorvzlxb2z9ovar6lgl: "/bin/kubeconform": not found

[yannh]

Just /kubeconform 👍

[nvuillam]

Works like a charm, many thanks for your fast and efficient support @yannh :)

[nvuillam]

(If you are interested, to thank you I can configure MegaLinter for you on kubeconform repo someday :) )