path pickling for gbasf2 fails for conditional paths, e.g. udst.add_skimmed_udst_output

[meliache]

Originally posted by @schmitca in #181 (comment):

Dear @meliache, I am happy to test it. At the moment, the grid jobs with udst.root output fail, before download can be attempted. This is because running the pickled basf2 path with udst.add_skimmed_udst_output(skimDecayMode='skimname') fails with

[FATAL] identical from/to parameter value   { module: SwitchDataStore ('' -> 'skim_skimname') function: virtual void Belle2::SwitchDataStoreModule::initialize() }
[INFO] ===Error Summary================================================================
[FATAL] identical from/to parameter value   { module: SwitchDataStore ('' -> 'skim_skimname') }

This can be traced back to the fact that
basf2.pickle_path.deserialize_path( basf2.pickle_path.serialize_path(mypath)) != mypath
I will try to find/contact an expert for basf2.pickle_path.

Originally posted by @meliache in #181 (comment):

I just checked the definition of udst.add_skimmed_udst_output and it seems that it creates an additional conditional path

    skim_path = basf2.create_path()
    [...]
    filter_path.add_independent_path(skim_path, "skim_" + skimDecayMode)
    add_udst_output(
        skim_path,
        outputFile,
        saveParticleLists,
        additionalBranches,
        dataDescription=dataDescription,
        mc=mc,
    )

I don't understand conditional paths super well, but it's well possible that serialize_path has problems with that.

basf2.pickle_path.deserialize_path( basf2.pickle_path.serialize_path(mypath)) != mypath
You could check really what's the difference by eye or looking at the diff of basf2.print_path. Sadly I don't think I have the time to dig into thhat.

[schmitca]

Thank you @meliache for opening this. I issued a JIRA ticket for basf2 with more info:
https://agira.desy.de/browse/BIIANA-313