Support XDG directories

[gibfahn]

Simplest version would just be to read an env var like $PULUMI_HOME and use that instead of $HOME/.pulumi if defined. That way those that care can set the variable.

Something like what git does (see the docs, it supports all the defaults, and env vars, and command line flags) would be the fancy version.

Sorry if this is the wrong place to raise this!

[ellismg]

Sorry if this is the wrong place to raise this!

No, this is the correct place. This is a change we'd be willing to accept, but would love help on, if you're interested. Would be interesting to look at the XDG spec and see what parts of ~/.pulumi would be mapped where (I could imagine that our plugin cache ends up under $XDG_CACHE_HOME or something).

[Volatus]

I'd like to take this one up.

[Volatus]

This is actually a bigger change than I previously thought, there are a number of instances where the paths are hardcoded throughout the codebase. The easiest "fix" is to set the $PULUMI_HOME variable to the $XDG_DATA_HOME/pulumi. Yes, it doesn't put all files strictly where they belong but it's better than $HOME/.pulumi.