Documents $HOMEBREW_PREFIX and $HOMEBREW_CACHE in README about legacy-linuxbrew HOT 10 CLOSED

Arguably HOMEBREW_CACHE should just have a different default on Linux.

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I don't believe there's a suitable world-writable cache on Linux, so I'll change the default to ~/.local/homebrew.

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There is a single base directory relative to which user-specific non-essential (cached) data should be written. This directory is defined by the environment variable $XDG_CACHE_HOME.
$XDG_CACHE_HOME defines the base directory relative to which user specific non-essential data files should be stored. If $XDG_CACHE_HOME is either not set or empty, a default equal to $HOME/.cache should be used.
http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html

I'd suggest using the env if it's there otherwise defaulting to ~/.cache/homebrew

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Yes, I agree. Does this patch look like something that could be incorporated into mxcl/homebrew?

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Oh, I missed the quoted part of your comment. Oddly, $XDG_CACHE_HOME is not set on Ubuntu. Does anyone know of a Linux (or other) system that uses these environment variables?

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Typically they are user or environment set. Worth respecting them as they are so easy to do.

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This is something for the wrapper script to do I think.

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If you mean the brew shell script, I'm inclined to keep that as simple as possible. I do think though that there's a good argument for factoring out os/linux/global.rb.

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Well, I think we'd allow these type of things to be user customisable with environment variables so if you implemented that the wrapper script could simply set its own defaults. Regardless the if/else approach won't really work unfortunately for getting merged up; linux/global may do.

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Okay. I'll add it to my os/linux todo list. There's other patches in Linuxbrew that should move there as well.

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