Re: [CentOS] Old and new package version numbers during RPM update

Anand Buddhdev wrote:

Hi CentOS folk,

In an RPM post-install script, is it possible to know the previous version number, and the new version number of a package if it's an update?

I need to know this, because for a certain package, if updating from version 1.x to 2.x, I need to run a program to convert the config file of the package from version 1.x format to version 2.x format.

I've looked at SPEC file documentation, but haven't found anything relevant.

triggers can support that, you can implement a trigger scriplet to run only if upgrading from < 2.x, using something like:

%triggerun foo < 2.x convert_config...

See also: http://rpm.org/api/4.4.2.2/triggers.html

-- Rex