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Subject:	Re: How does setup.exe cope with upgrading of already installed packages if there exist modification in installed files?
From:	"Yaakov (Cygwin/X)" <yselkowitz AT users DOT sourceforge DOT net>
To:	cygwin <cygwin AT cygwin DOT com>
Date:	Wed, 19 Oct 2011 12:01:15 -0500
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On Wed, 2011-10-19 at 09:27 -0400, Andrew Schulman wrote:
> This is up to each package maintainer.  Current best practice - at least,
> as of a year or two ago when I asked about it on cygwin-apps I think - is
> to include:
> 
> (1) a default config file in /etc/defaults/etc;
> (2) a preremove script that removes the existing config file iff it hasn't
> change from the default; and
> (3) a postinstall script that installs the default config into /etc if no
> other config file is already there.
> 
> If all three of those are present, then a package upgrade will replace the
> existing config files if and only if they haven't changed since they were
> installed.  If they have changed, then it's up to the user to merge the old
> and new configs.
> 
> cygport provides automatic support for (1) and (3) above if you call e.g.
> 
>   make_etc_defaults /etc/lftp.conf
> 
> To complete the set, package maintainers have to separately include a
> simple preremove script, e.g.

Actually, cygport handles (2) as well.  No further intervention should
be necessary once make_etc_defaults is called.


Yaakov



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