xml2json breaks with HistoPath including filename

[alexander-held]

Summary

I ran into a setup I hadn't seen previously that seems to break pyhf xml2json. As far as I can tell, cases like the following are problematic:

<Data HistoName="tt1b_1l_data_regBin" InputFile="Fit_1l_combined_Fit_1l_model_428.root" HistoPath="Fit_1l_combined_Fit_1l_model_428.root:/tt1b_1l_hists/data/"  />

Note how HistoPath includes intra-file navigation. The hist2workspace CLI in ROOT seems to handle this fine. I am not sure if this is following intended specification or not and if hist2workspace not crashing is a coincidence or not. The conversion script looks at Fit_1l_combined_Fit_1l_model_428.root:/tt1b_1l_hists/data/ but would need to look at tt1b_1l_hists/data/ in the file, stripping out the file name.

I do not have a minimal public setup to reproduce, please feel free to ping me here and I can put one together (just opening this issue before I forget so we can track it).

OS / Environment

n/a

Steps to Reproduce

n/a

File Upload (optional)

No response

Expected Results

successful conversion

Actual Results

KeyError: 'Both tt_light_1l_data_regBin and Fit_1l_combined_Fit_1l_model_428.root:/tt_light_1l_hists/data/tt_light_1l_data_regBin were tried and not found in [...]/Fit_1l_combined_Fit_1l_model_428.root'

pyhf Version

f561f867f1327ccfa8e631885d28e87863930d8b (newer than v0.7.6)

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