CFT: new BSD-licensed sort available
Jonathan Anderson
jonathan.anderson at cl.cam.ac.uk
Thu Mar 15 01:04:03 UTC 2012
On 14 Mar 2012, at 21:10, Adrian Chadd wrote:
> Hi,
>
> This makes me think of the whole debian-y way of replacing the mailer
> programs using some magic alias program.
>
> So you could intall gnusort, bsdsort, and then some config file would
> determine which was used.
>
> 'sort' would then be a symlink to said magic program, that'd look at
> its argv[0], look at the contents of that file, and exec() the right
> one.
In fact, the runtime behaviour of the Debian "alternatives" system is simpler than that:
http://segfault.in/2010/04/using-the-debian-alternatives-system/
The custom Perl script with a config file is used to set up symlinks, which at runtime are... well, just symlinks. For instance, /usr/bin/vim is a symlink to /etc/alternatives/vim, which is itself a symlink to a binary like vim.gtk (example shamelessly stolen from the linked page, since I no longer have any Debian boxes to check for myself on :). No magic binaries or argv[0] fu.
In one way, it's an elegant solution. On the other, it's a classic example of Wheeler's Law in action. :)
Jon
--
Jonathan Anderson
Research Student, Security Group
Computer Laboratory
University of Cambridge
+44 (1223) 763747
jonathan.anderson at cl.cam.ac.uk
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