[8.0] Platform detection on recent EL9 broken

[sfayer]

Hi,

A recent update to glibc on EL9 platforms has resulted in dirac-platform returning an incorrect result:

$ rpm -q glibc
glibc-2.34-125.el9_5.8.x86_64
$ dirac-platform
Linux_x86_64_glibc-2.35
# This should clearly be 2.34! It only went wrong after glibc was recently updated.
# Python itself gets it correct:
$ python -c "import platform; print(platform.libc_ver())"
('glibc', '2.34')

It appears DIRAC contains a copy of the platform.libc_ver() function from the python standard library due to a really old bug: This copy has now aged and doesn't work correctly any more. As a fix, I propose going back to the standard version and dropping the copy entirely (as the bug was fixed over a decade ago!).

Regards,
Simon

BEGINRELEASENOTES
*Core
FIX: Platform detection on recent EL9 broken
ENDRELEASENOTES

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/14831410664

Failed:

• integration
  cherry-pick 0b13bd2 into integration failed
  check merge conflicts on a local copy of this repository

  git fetch upstream
  git checkout upstream/integration -b cherry-pick-2-0b13bd25a-integration
  git cherry-pick -x -m 1 0b13bd25a
  # Fix the conflicts
  git cherry-pick --continue
  git commit --amend -m 'sweep: #8185 Platform detection on recent EL9 broken' --author='Simon Fayer <sf105@ic.ac.uk>'
  git push -u origin cherry-pick-2-0b13bd25a-integration
  
  # If you have the GitHub CLI installed the PR can be made with
  gh pr create \
       --label 'sweep:from rel-v8r0' \
       --base integration \
       --repo DIRACGrid/DIRAC \
       --title '[sweep:integration] Platform detection on recent EL9 broken' \
       --body 'Sweep #8185 `Platform detection on recent EL9 broken` to `integration`.
  
  Adding original author @sfayer as watcher.
  
  BEGINRELEASENOTES
  *Core
  FIX: Platform detection on recent EL9 broken
  ENDRELEASENOTES
  Closes #8186'