Unable to run notebook with error: packages.Load() could not find package

[Dan Kortschak]

Gophernotes looks like it's failing again for me. Attempting to run the notebook at https://mybinder.org/v2/gh/kortschak/graphprac/master?filepath=graph-prac.ipynb gives the following (Go1.13).

error loading package "github.com/kortschak/graphprac" metadata: packages.Load() could not find package "github.com/kortschak/graphprac"

I get this error when running locally (Go1.15).

error loading package "github.com/kortschak/graphprac" metadata: -: cannot find module providing package github.com/kortschak/graphprac: working directory is not part of a module

I don't know if this is related to #184, but the local error suggests so.

[Dan Kortschak]

I have just reinstalled gophernotes locally with version v0.7.1 and it is working locally, so this issue becomes a question about what it is that I'm doing wrong in the postBuild on the MyBinder configuration. I'll have a little play to see if I can fix that.

[Dan Kortschak]

Resolved with some care given to the postBuild.

[Massimiliano Ghilardi]

Good to hear that you solved this problem.

Would you care to post the differences between the 'broken' and the 'working' build script ?

Or maybe the critical parts were the following?

export GO111MODULE=on
# ...
go get github.com/gopherdata/gophernotes@v0.7.1

[Dan Kortschak]

The change that fixed the problem was this. Within that mess, I'd say the crucial lines are ones that you mentioned and then copying and replacing the kernel.json to include the $GOROOT and updated $PATH that otherwise lacks the go tool.