Segmentation violation due to pyROOT import

[jurenag]

The pyROOT module is imported in src/waffles/input_output/input_utils.py and src/waffles/input_output/raw_root_reader.py if a ROOT installation is found at runtime. Some people have reported encountering a segmentation violation if such import eventually happens.

I have reproduced this segmentation fault in the main branch of waffles (at commit 1e771ab) by running the following line in lxplus9

import waffles.input_output.input_utils as x

using either version of the DBT environment, fddaq-v4.4.7-a9-1 or fddaq-v5.2.0-a9-1 (which use Python 3.10.4 and 3.10.10 respectively), and either builds of ROOT (both located in /cvmfs/sft.cern.ch/lcg/app/releases/ROOT/), 6.32.02/x86_64-almalinux9.4-gcc114-opt or 6.34.04/x86_64-almalinux9.5-gcc115-opt (which seem to have been compiled against Python 3.9.18 and 3.9.21, respectively).

A copy of the error output is attached in log.txt

[hvsouza]

Hello! Apparently the problem is that DBT env. uses python 3.10.4 while LCG root available are 3.9.12 or 3.11.9

I tried manually installing ROOT v6-26-10 (and others) but it fails.
In this particular version, the error that I get is:

-- Checking for module 'glib-2.0'
--   Package 'glib-2.0', required by 'virtual:world', not found
CMake Error at /cvmfs/dunedaq.opensciencegrid.org/spack/externals/ext-v2.0/spack-0.20.0/opt/spack/linux-almalinux9-x86_64/gcc-12.1.0/cmake-3.26.3-ak2h2p5q3ojz7zijqyvjhfz4heopzr7c/share/cmake-3.26/Modules/FindPkgConfig.cmake:607 (message):
  A required package was not found
Call Stack (most recent call first):
  /cvmfs/dunedaq.opensciencegrid.org/spack/externals/ext-v2.0/spack-0.20.0/opt/spack/linux-almalinux9-x86_64/gcc-12.1.0/cmake-3.26.3-ak2h2p5q3ojz7zijqyvjhfz4heopzr7c/share/cmake-3.26/Modules/FindPkgConfig.cmake:829 (_pkg_check_modules_internal)
  cmake/modules/FindGFAL.cmake:27 (pkg_check_modules)
  cmake/modules/SearchInstalledSoftware.cmake:18 (_find_package)
  cmake/modules/SearchInstalledSoftware.cmake:1089 (find_package)
  CMakeLists.txt:245 (include)

My suggestion would be to people keep two env.:

1. Use DBT to convert from hdf5 to pickle
2. Use normal python env. to convert from pickle to ROOT