Delay XRootD import to only require it if an eos file is requested

This MR delays the requirement of XRootD in utils.py. This allows Allen standalone to only require xrootd if reading files from eos, which is not really a requirement in most cases.

The motivation for this change is to allow macos compatibility in Allen, as there is no obvious procedure to install xrootd python bindings under macos.

Closes Allen#372 (closed)

FYI @graven

added RTA label

/ci-test

added ci-test-triggered label

• [2022-09-21 15:28] Validation started with lhcb-master-mr#5701

approved this merge request

Is this segfault harmful? https://lhcb-nightlies.web.cern.ch/nightly/lhcb-master-mr/5701/Moore/x86_64_v2-centos7-gcc11+dd4hep-opt/tests#RecoConf.allen_gaudi_velo_with_mcchecking

The dd4hep builds are not expected to function until either Allen!956 (merged) is merged (for sequences that use only subdetectors that are ready for DD4hep) or the respective DD4hep detector elements are implemented.

A segfault is of course not good, so failing more gracefully is something that should be looked at, but not as part of this MR.

assigned to @raaij

approved this merge request

resolved all threads

merged

mentioned in commit aac53cf2

unassigned @raaij

assigned to @rmatev