Go plugin ignores GOPATH

snapcraft
1

Hi,

Since a couple of hours the containerd part [1] on MicroK8s is failing to build. Here is how it is failing:

+ snap refresh go --channel=1.15/stable
snap "go" has no updates available
+ go version
go version go1.15.5 linux/amd64
+ realpath ../go
+ export GOPATH=/root/parts/containerd/go
+ go get -d github.com/opencontainers/runc
+ cd /root/parts/containerd/go/src/github.com/opencontainers/runc
/bin/sh: 55: cd: can't cd to /root/parts/containerd/go/src/github.com/opencontainers/runc

On the debug console I see that the github.com/opencontainers/runc was not created under the export GOPATH=/root/parts/containerd/go. It is as if the export GOPATH is ignored.

Tried to snap revert snapcraft but had the same error with v4.4.2.

A workaround is to move to the dump plugin.

Thanks

2

It looks like you’re not using the go plugin’s functionality, instead replacing the inbuilt build step with your own script. The problem, therefore, is likely either with your override-build script or go itself, which you’re installing with the go snap.

3

I suspect the underlying cause is this change to containerd:

https://github.com/containerd/containerd/pull/4760

Your project built successfully when containerd did not include a go.mod file, and fails now that they’ve added one.

Both the Go toolchain and Snapcraft’s Go plugin behave a little differently when building module aware code. In particular, modules downloaded with go get end up in $GOPATH/pkg/mod ratheer than $GOPATH/src.

You will either need to pin to an older release of containerd, or update your snapcraft.yaml to account for the upstream changes.

4

Thank you for your help.

I think I’ll go with the dump plugin since as you said i am already overriding the go plugin logic.