[Bug]: RucioFileCatalogClient overrides rucio's builtin configuration for extract_scope mechanism

[maxnoe]

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Bug Description

In an installation with a properly configured rucio and rucio policy package the correct extract_scope algorithm should be used by default, however, the RucioFileCatalogClient overrides this with a value from the dirac configuration system:

DIRAC/src/DIRAC/Resources/Catalog/RucioFileCatalogClient.py

Line 107 in 795b399

self.diracScopeAlg = options.get("DiracScopeAlg", "dirac")

I think it would be better if it relied on the rucio configuration instead, which can register the correct extract_scope algorithm via the policy package.

Steps to Reproduce

With the CTAO rucio policy installed, which correctly handles this case, but the default configuration is overriden to use the dirac scope extraction:

❯ dirac-dms-filecatalog-cli
Starting FileCatalog console
FC:/> ls
Traceback (most recent call last):
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/bin/dirac-dms-filecatalog-cli", line 7, in <module>
    sys.exit(main())
             ~~~~^^
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/DIRAC/Core/Base/Script.py", line 74, in __call__
    return entrypointFunc._func()
           ~~~~~~~~~~~~~~~~~~~~^^
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/DIRAC/DataManagementSystem/scripts/dirac_dms_filecatalog_cli.py", line 89, in main
    cli.cmdloop()
    ~~~~~~~~~~~^^
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/cmd.py", line 146, in cmdloop
    stop = self.onecmd(line)
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/cmd.py", line 224, in onecmd
    return func(arg)
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/DIRAC/DataManagementSystem/Client/FileCatalogClientCLI.py", line 1190, in do_ls
    result = self.fc.isFile(path)
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/DIRAC/Resources/Catalog/Utilities.py", line 81, in processWithCheckingArguments
    result = f(*argTuple, **kwargs)
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/DIRAC/Resources/Catalog/RucioFileCatalogClient.py", line 460, in isFile
    dids.append(self.__getDidsFromLfn(lfn))
                ~~~~~~~~~~~~~~~~~~~~~^^^^^
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/DIRAC/Resources/Catalog/RucioFileCatalogClient.py", line 207, in __getDidsFromLfn
    scope = get_scope(lfn, scopes=self.scopes, diracAlgorithm=self.diracScopeAlg)
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/DIRAC/Resources/Catalog/RucioFileCatalogClient.py", line 41, in get_scope
    scope, _ = extract_scope(did=lfn, scopes=scopes, default_extract=diracAlgorithm)
               ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/rucio/common/utils.py", line 670, in extract_scope
    return scope_extraction_algorithms.extract_scope(did, scopes, extract_scope_convention)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/rucio/common/utils.py", line 582, in extract_scope
    return fn(did, scopes)
  File "/home/maxnoe/.local/conda/envs/dpps-preprod/lib/python3.13/site-packages/rucio/common/utils.py", line 653, in extract_scope_dirac
    scope = elem[1]
            ~~~~^^^
IndexError: list index out of range

Expected Behavior

No response

Actual Behavior

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Environment

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Relevant Log Output

Additional Context

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[aldbr]

@cserf any comment?

[cserf]

This was introduced by @martynia AFAIR. Can you please comment ?