Need a way to change global-stack-root

[rrnewton]

stack path --global-stack-root reports the root. But as far as I can see this is hard coded? There is no analog of stack --local-bin-path or an environment variable like STACK_YAML to control the root?

My use case is to pick between machine-local and NFS installations of stack. That is, we may have ~/.stack necessarily as an NFS-stored directory, for machines where we don't have any local mounts. But then ones where we do, we could do something like the following

if [ -d /home.local/me/.stack ]; then
  export STACK_GLOBAL_ROOT=/home.local/me/.stack
...

[borsboom]

The STACK_ROOT environment variable sets the location. That could definitely be documented better (it's only in the installation instructions). Not sure why the inconsistency between that name and the stack path --global-stack-root argument, might be nice to fix. And having it overridable on the command-line would be nice too.