config.rb: add comment explaining HOMEBREW_TEMP logic
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@ -45,6 +45,7 @@ HOMEBREW_CELLAR = Pathname.new(ENV["HOMEBREW_CELLAR"])
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HOMEBREW_LOGS = Pathname.new(ENV["HOMEBREW_LOGS"] || "~/Library/Logs/Homebrew/").expand_path
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# Must use /tmp instead of $TMPDIR because long paths break Unix domain sockets
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HOMEBREW_TEMP = Pathname.new(ENV.fetch("HOMEBREW_TEMP", "/tmp"))
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unless defined? HOMEBREW_LIBRARY_PATH
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