brew.sh: disable running Homebrew as root.

[MikeMcQuaid]

November 1st 2016 has come and gone so it's time to disable this.

Also, add comments explaining why the things that have been whitelisted have been (to avoid more being added without good justification).

[adidalal]

Homebrew Cask also shouldn't be run with sudo, FWIW. But we do call .pkg installs and overwrite .app bundles if the --force flag is given, which may use sudo.

If this PR doesn't block that behavior, then I don't know that HBC even needs that exception (sudo brew cask is not supported).

Haven't poked around the core code too much, @reitermarkus or @jawshooah may be able to confirm.

[MikeMcQuaid]

@adidalal I've previously used it when I want to call from a script and not have it prompt for sudo access.

[reitermarkus]

I've previously used it when I want to call from a script and not have it prompt for sudo access.

This will make cache files, Caskroom sub-directories, and all other files that are extracted/copied root-owned, so you shouldn't do that.

Therefore, as @adidalal said,

sudo brew cask is not supported

[MikeMcQuaid]

@reitermarkus 🆒, will 👍 a PR that removes it. What's the "correct" way to handle what I mentioned?

[pataar]

Question: Will this also stop me from using sudo brew services restart httpd24 for example?
Still supporting sudo brew services. Awesome :)

[reitermarkus]

What's the "correct" way to handle what I mentioned?

I don't know if there is such a thing as the "correct" way for sudo.

I had been using a variation on https://gist.github.com/cowboy/3118588 in my dotfiles, but as you can see from my comment over there, I recently had to move to this, due to this.