Re: Data updates in debian packages

[Christian Seiler <christian@iwakd.de>]

On 10/31/2016 10:30 AM, Ole Streicher wrote:
> -------------------- debian/triggers ------------------
> interest /usr/share/zoneinfo/leap-seconds.list
> ---------------------------8<--------------------------
> 
> However, I now get the following error when I try to update tzdata:
> 
> dpkg: cycle found while processing triggers:
>  chain of packages whose triggers are or may be responsible:
>   casacore-data-tai-utc -> casacore-data-tai-utc
>  packages' pending triggers which are or may be unresolvable:
>   casacore-data-tai-utc: /usr/share/zoneinfo/leap-seconds.list
> dpkg: error processing package casacore-data-tai-utc (--configure):
>  triggers looping, abandoned
> Errors were encountered while processing:
>  casacore-data-tai-utc
> 
> What is my mistake here?

Well, if your package Depends: on tzdata, then you created a cycle:
tzdata wants to trigger your package, but your package depends on
tzdata.

What you'll want to do is

interest-noawait ...

instead of

interest ...

A detailed explanation is man 5 deb-triggers together with
/usr/share/doc/dpkg-dev/triggers.txt.gz, but it's not easy to grok.
However, the recommendation in man 5 deb-triggers is something you
should follow, i.e. use -noawait triggers unless you really need
-await triggers for some reason.

Regards,
Christian