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

[John R Pierce]

On 6/28/2015 2:26 PM, Anand Buddhdev wrote:
> On 28/06/15 17:50, John R Pierce wrote:
>
>> why doesn't the config file have the version in it ? not having that 
>> makes your whole system error prone. 
> Perhaps I wasn't clear. Version 1 of the package uses a config file that
> looks like this:
>
> system {
>    setting1 value1;
>    setting2 value2;
> }
>
> interfaces {
>    iface1;
>    iface2;
> }
>
>
> Version 2 of the package has switched to a YAML-based syntax, so the
> config file needs to look like this:
>
> system:
>    setting1: value1
>    setting2: value2
>
>
> So, I need to be able to program the RPM so that when upgrading from 1.x
> to 2.x, it triggers the conversion utility that converts from v1 to v2
> format.

so a regex looking for "system:" vs "system {"   should nicely delineate 
these.   I dunno, I might even put that into the conversion utility and 
have it just quit if the file is already in the new format, and always 
run it.



-- 
john r pierce, recycling bits in santa cruz