Suppress 7z x output in stack setup on Windows (WAS: stack --verbosity=error setup on Windows)

[hdgarrood]

I am trying to set up Windows CI for purescript via appveyor, and I noticed that stack setup prints a massive amount of information which I don't really care about, at least, not when it succeeds. From reading the output of stack --help it appeared to me that using --verbosity=error would remove this output, but adding this option doesn't seem to have had any effect.

Here is the build: https://ci.appveyor.com/project/hdgarrood/purescript/build/13

[hdgarrood]

Just to clarify: the command I'm using is stack --no-terminal --verbosity=error setup.

[borsboom]

I think this is mostly the output of the GHC decompression being run as a subprocess, which stack's --verbosity doesn't effect. That said, there are probably ways we could suppress this output. The workaround I've seen people use is to run stack setup >nul (e.g. appveyor.yml).

[hdgarrood]

Yeah, I have something similar now, but simply suppressing the output is not quite what I'd consider ideal - if an error occurs during decompression, I do want to see it.

Currently I have stack setup --verbosity=error 2>&1 >stack-setup.log || type stack-setup.log which does seem to do what I want.

[sjakobi]

Closing as a duplicate of #1212.