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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] [PATCH] Allow default network type to be determined
	from an environmental variable
Date: Sat, 19 Jan 2008 21:10:09 +0000
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To: qemu-devel@nongnu.org
Cc: Anthony Liguori <aliguori@us.ibm.com>

> In the absence of a global configuration file, a reasonably sane way to
> support this configuration system wide is to use an environmental
> variable.  QEMU already uses a number of global variables for
> configuring audio options.

I'd really prefer we didn't do this, and preferably obsoleted/removed the 
existing environment variables.  IMHO using environment variables is a really 
bad idea and should be avoided wherever possible.

Environment variables are about the worst user interface I can think of. For a 
start they're a global resource, which is limited on some systems.
It's also extremely hard to determine what environment a user is running. This 
makes reproducing user bugs somewhere between hard and impossible.

Paul