owlcat vs python3-meqtrees-cattery on KERN-7: broken dep?

[o-smirnov]

root@baker:/etc/netplan# apt install owlcat python3-owlcat
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 python3-owlcat : Depends: python3-meqtrees-cattery but it is not installable
E: Unable to correct problems, you have held broken packages.
root@baker:/etc/netplan# apt install owlcat python3-owlcat python3-meqtrees-cattery
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package python3-meqtrees-cattery is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python3-meqtrees-cattery' has no installation candidate
root@baker:/etc/netplan# 

[gijzelaerr]

owlcat depends on meqtrees cattery:

https://github.com/ska-sa/owlcat/blob/master/setup.py#L12

unfortunately, meqtrees has not been ported to py3 (yet).

if it is an optional dependency, it should be made an optional dependency upstream.

[o-smirnov]

Actually, meqtrees-cattery has been ported. In fact the whole stack is ported to py3. The only issue is that the meqbrowser app needs qt4, which has been dropped in Focal.

So we need to make a plan to package everything except the browser (or even package the browser and have it bomb out with an error message).

Cheers,
Oleg

[gijzelaerr]

cool cool. @Athanaseus can you try to create a package for https://github.com/ska-sa/meqtrees-cattery/releases/tag/v1.7.2 ?

[o-smirnov]

But also meqtrees-timba please, sans browser.

[Athanaseus]

I uploaded meqtrees-cattery. I'm stuck with meqtrees-timba since it depends on casarest, and apparently, this is a stale package, I wasn't able to package it. I have couple of issues, some which I solved others not. I have opened the issue upstream but no response yet. casacore/casarest#40.

If I can remember we only need casarest for lwimager? Can timba roll without casarest?

[o-smirnov]

Yeah absolutely. I think the only place it uses lwimager is in the batch test. We could even just redo the test using wsclean?

[Athanaseus]

Yes, that's even a better alternative.
Are you referring to the the make_ms.sh here https://github.com/ska-sa/meqtrees-cattery/search?q=lwimager?

[o-smirnov]

That's just used to insert MODEL_DATA and CORRECTED_DATA columns. Not sure it's even necessary TBH!

[gijzelaerr]

what about this one @Athanaseus , has this been resolved or is this still work in progress?

[Athanaseus]

This should be resolved. The latest Meqtrees and owlcat are uploaded to KERN-7.