MacOS install compatibility.

[KyleTryon]

Orb version

What happened

@ganezasan has found that the Yarn install incorrectly installs under MacOS due to including an incorrect PATH (for MacOS).

https://github.com/CircleCI-Public/node-orb/blob/master/src/commands/install-yarn.yml#L21

First reported here: https://discuss.circleci.com/t/having-fork-resource-temporarily-unavailable-when-running-commands-on-macos/30966/4?u=jcm

The incorrect path leads to slow processes on MacOS and errors similar to the following:
^D^D/tmp/.bash_env-5d10d6f32cffde0008c4dc34-0-build: fork: Resource temporarily unavailable

Expected behavior

Detect OS and change install path (@ganezasan has mentioned removing this line would work).

[KyleTryon]

@ganezasan Created a proof - https://circleci.com/gh/ganezasan/circleci-sandbox/2627

@iynere Could we discuss how you would like this resolved in a "standardized" way?

[iynere]

@KyleTryon actually, this was already on my plate for today

[iynere]

@KyleTryon @ganezasan you can take a look at the (misleadingly named) test-against-oracle branch, where i'm refactoring for cross-platform compatibility across the orb commands

https://github.com/CircleCI-Public/node-orb/tree/test-against-oracle
https://circleci.com/gh/CircleCI-Public/node-orb/tree/test-against-oracle

[iynere]

#6 closes this

[JCMais]

@iynere after updating the orb, I'm having the following error when running yarn config set cache-folder ~/.cache/yarn

#!/bin/bash --login -o pipefail
yarn config set cache-folder ~/.cache/yarn
^D��^D��yarn config v1.16.0
error An unexpected error occurred: "EACCES: permission denied, scandir '/Users/distiller/.config/yarn/link'".
info If you think this is a bug, please open a bug report with the information provided in "/Users/distiller/project/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/config for documentation about this command.
Exited with code 1

[iynere]

@JCMais did you try running it with sudo ?

[iynere]

@JCMais this is a separate issue so please open a new issue with further information, if you could