Re: How to detect an upgrade from an older version of a package

["Eugene V. Lyubimkin" <jackyf.devel@gmail.com>]

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Thomas Goirand wrote:
> Hi,
> 
> I want to make an update to libapache-mod-log-sql that needs some
> maintenances in it's SQL databases if we need to upgrade. Namely, it
> needs some table structure upgrades.
> 
> I know many "hacks" to know that I'm upgrading (like doing dpkg -l,
> etc.), but what is the correct/policy way to know from what version my
> package is upgrading, so my postinst can run smoothly?
> 
> Thomas Goirand
> 
> 
IANADD.

Policy 6.6.3 says

"If the package is being upgraded, call:

          new-preinst upgrade old-version
"
Is it what you are seeking?
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