Re: [go-nuts] querying whether the go command would run in module mode

[Paul Jolly]

I raised https://github.com/golang/go/issues/36052 for discussion.

On Mon, 9 Dec 2019 at 10:29, Dan Kortschak <d...@kortschak.io> wrote:
>
> Thanks.
>
> Yes, I always have GO111MODULE=on, hence the difference.
>
> On Mon, 2019-12-09 at 10:04 +0000, Paul Jolly wrote:
> > > When you're not in a module it returns /dev/null on linux. I don't
> > > suppose this is platform independent?
> >
> > I have to say what you saw surprised me until Daniel Martí and I did
> > a
> > bit of experimentation.
> >
> > It seems the value of GO111MODULE matters here. If you have
> > GO111MODULE=on then the result of go mod env outside of a module
> > context is /dev/null (or your system's equivalent)
> >
> > If you have GO111MODULE unset (i.e. auto) then it is empty string.
> >
> > This is certainly not clear to me from the docs in go help
> > environment.
> >
> > I realise that this way (i.e. with the /dev/null output when
> > GO111MODULE=on) you can distinguish between modules being on/off, as
> > well as whether you're in a module context or not (regardless of
> > whether you have modules on/auto).
> >
> > But this doesn't exactly jump out at you from the docs of go help
> > environment, and I for one have incorrectly advised people on how to
> > check "are you in a module context or not". Because the logic becomes
> > something like:
> >
> > if gomod != "" && gomod != os.DevNull {
> >     // we are in a module context
> >
> > I'm going to raise an issue to suggest that the docs are clarified
> > here.
>

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