Host authoritative specsim default configuration file about desimodel

[dkirkby]

For background on this issue see desihub/desisim#93.

[sbailey]

I like get_specsim_config(), but should it return a yaml file, or the contents that would have been loaded from said yaml file? I think the latter is cleaner if that can be made compatible with specsim, since it doesn't involve making a temporary file just so that specsim can read it back in.

I had originally been thinking that we would provide a script in desimodel to convert its contents (including desimodel/data/desi.yaml) into a specsim_desi.yaml file that would also be kept in desimodel. But that requires humans to remember to update specsim_desi.yaml when desi.yaml is updated. Fragile. Doing it on the fly with get_specsim_config() is nice, at the cost of not having a file directly in github that is already the canonical file to use.

[weaverba137]

@dkirkby, I'm assigning this to you so that you can assign it to someone who can resolve this issue.

[rainwoodman]

what about returning a dict instead of a file? It sounds strange to serialize and deserialize; plus the load_config API can't handle string input anyways.

import desimodel
from specsim.config import Configuration
specsimconfig = Configuration(desimodel.get_specsim_config())
...
...

[weaverba137]

Can this be resolved so that we can create (or not create) a data model for the file(s)?

[dkirkby]

I can take care of this but I'm not sure if this is still the direction we want to go. @sbailey ?

[weaverba137]

We do want to move the filter curves over to desispec, but this is very low priority for now.