What is the best way to set variables depending on environment?

[Magnus Therning]

On Wed, Sep 07, 2005 at 04:26:22PM +0300, janne.jokitalo at dnainternet.net wrote:
>Hello all,
>
>I'm bringing my laptop home from work every day, and I'd need to unset
>the various proxy settings for different applications each time after
>I've ifup'd the wireless network. For now I've just made the change to
>each program I'd use (and had used at work too), but since many are now
>able to use the 'http_proxy' variable, I was thinking, couldn't a
>script automatically set/unset that variable depending on which IP
>address my machine got after requesting one from a DHCP server? They
>are distinguishable, as at work the IP begins with 10.*, but my home
>network uses 192.168.* addresses.
>
>Well, that wass kind of a rhetorical question, my real one is how to
>best do this? I was thinking, maybe adding a line to ifupdown script to
>fire another after successfully set an IP. But then, if the script gets
>updated automatically during a dist-upgrade or something, wouldn't I
>lose that change? I know dpkg (or is that debconf?) asks before
>altering a configuration file if it recognizes user-made changes, and I
>know it isn't a big change to be made after the update, but still,
>there probably are more elegant ways of doing this, right?
>
>Thanks in advance for any possible solutions!

Have you looked at the package laptop-netconf? It seems to be aimed at
the sort of thing you are talking about.

Let me know how it works out, I'll hopefully be in your situation in a
few weeks (all hinging on BT getting their arse into gear)...

/M

-- 
Magnus Therning                    (OpenPGP: 0xAB4DFBA4)
magnus at therning.org
http://therning.org/magnus

Software is not manufactured, it is something you write and publish.
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Please route all spelling related flames or spelling corrections to
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Fixed in Magnus-r2.
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