How should I fix my Homebrew installation after upgrading OS X? Context

My employer gave me a MacBook Pro for development work; however, most of the development work I do in my research group is for Linux platforms, and for a host of policy reasons, I can't install virtualization software on this laptop. Homebrew looks like a good way in which to install these tools, especially because it looks very hackable (since it uses Ruby; MacPorts does not look hackable, because it uses Tcl). However, Homebrew relies on system libraries, and for security reasons, my employer may (and from what I hear, frequently will) upgrade my system at any time. I've heard that OS X upgrades will break Homebrew. (See, for instance, https://stackoverflow.com/questions/7779300/how-should-i-upgrade-xcode-after-upgrading-to-os-x-lion).

Question

How would I go about fixing my Homebrew install after an OS X upgrade? I am fine with deleting it and starting from scratch again, as long as I can do so in an automated way. (For instance, using Puppet plus a Homebrew provider to script a configuration that will automatically build upon running a shell script.) I've been Googling everywhere and can't seem to find any answers to this question.
brew update


Updates the Homebrew installation. If there are any errors, they should be reported by brew doctor. Try fixing them else, you could use the uninstall script as follows:

#!/bin/sh
# Just copy and paste the lines below (all at once, it won't work line by line!)
# MAKE SURE YOU ARE HAPPY WITH WHAT IT DOES FIRST! THERE IS NO WARRANTY!

function abort {
  echo "$1"
  exit 1
}

set -e

/usr/bin/which -s git || abort "brew install git first!"
test -d /usr/local/.git || abort "brew update first!"

cd `brew --prefix`
git checkout master
git ls-files -z | pbcopy
rm -rf Cellar
bin/brew prune
pbpaste | xargs -0 rm
rm -r Library/Homebrew Library/Aliases Library/Formula Library/Contributions
test -d Library/LinkedKegs &amp;&amp; rm -r Library/LinkedKegs
rmdir -p bin Library share/man/man1 2&gt; /dev/null
rm -rf .git
rm -rf ~/Library/Caches/Homebrew
rm -rf ~/Library/Logs/Homebrew
rm -rf /Library/Caches/Homebrew


And install homebrew again. Am pretty sure all this is configurable using puppet.