Homebrew (opt-in) Analytics tweaks. (#57)

- add `HOMEBREW_PRODUCT` global variable
- only differentiate between `/usr/local` and `non-/usr/local` Homebrew
  prefixes to avoid sharing sensitive user information
- note if e.g. build errors are occurring under CI
- Add `HOMEBREW_NO_ANALYTICS` variable (this will be how people opt-out
  when this is enabled for everyone)
- Add `HOMEBREW_ANALYTICS_DEBUG` variable to output all the analytics
  that are sent
- Move Bash analytics code to `Library/Homebrew/utils/analytics.sh`
- Add documentation for our analytics and why/what/when/how and opt-out
- Only official Homebrew commands are reported
- Ruby analytics are now reported in a forked, background process

1 files changed, 1 insertions, 0 deletions

diff --git a/Library/Homebrew/cmd/tests.rb b/Library/Homebrew/cmd/tests.rb
index 19576ddd3..5ec841773 100644
--- a/Library/Homebrew/cmd/tests.rb
+++ b/Library/Homebrew/cmd/tests.rb
@@ -3,6 +3,7 @@ require "fileutils"
 module Homebrew
   def tests
     (HOMEBREW_LIBRARY/"Homebrew/test").cd do
+      ENV["HOMEBREW_NO_ANALYTICS"] = "1"
       ENV["TESTOPTS"] = "-v" if ARGV.verbose?
       ENV["HOMEBREW_NO_COMPAT"] = "1" if ARGV.include? "--no-compat"
       if ARGV.include? "--coverage"