unreadable field init file leads to segfault

[valentin-krasontovitsch]

To reproduce
Steps to reproduce the behaviour:

1. pip install ert
2. get the ert repo and move to test-data/snake_oil_field
3. modify the field init files in the fields directory to be unreadable by your user
4. run ert test_run snake_oil_field.ert, or ert gui snake_oil_field.ert and start test run
5. segfault

Expected behaviour
an error message telling you that the init file(s) are unreadable

[valentin-krasontovitsch]

the reason is this bug in ecl

[valentin-krasontovitsch]

solved by enkfs-refactor efforts
output on that branch is

$ ert test_run snake_oil_field.ert
Warning: ERT is running in an existing runpath
Exception in thread ert_cli_simulation_thread:
Traceback (most recent call last):
  File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.10/threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "/home/val/code/equinor/ert/src/ert/shared/models/base_run_model.py", line 169, in start_simulations_thread
    self.startSimulations(
  File "/home/val/code/equinor/ert/src/ert/shared/models/base_run_model.py", line 180, in startSimulations
    run_context = self.runSimulations(
  File "/home/val/code/equinor/ert/src/ert/shared/models/single_test_run.py", line 31, in runSimulations
    return self.runSimulations__(
  File "/home/val/code/equinor/ert/src/ert/shared/models/ensemble_experiment.py", line 122, in runSimulations__
    self.ert().sample_prior(
  File "/home/val/code/equinor/ert/src/ert/_c_wrappers/enkf/enkf_main.py", line 493, in sample_prior
    props = xtgeo.gridproperty_from_file(
  File "/home/val/code/py-venvs/equinor/ert/lib/python3.10/site-packages/xtgeo/grid3d/grid_property.py", line 98, in gridproperty_from_file
    return GridProperty._read_file(*args, **kwargs)
  File "/home/val/code/py-venvs/equinor/ert/lib/python3.10/site-packages/xtgeo/grid3d/grid_property.py", line 929, in _read_file
    fformat = pfile.detect_fformat()
  File "/home/val/code/py-venvs/equinor/ert/lib/python3.10/site-packages/xtgeo/common/sys.py", line 516, in detect_fformat
    fformat = self._detect_fformat_by_contents(details)
  File "/home/val/code/py-venvs/equinor/ert/lib/python3.10/site-packages/xtgeo/common/sys.py", line 535, in _detect_fformat_by_contents
    with open(self.file, "rb") as fhandle:
PermissionError: [Errno 13] Permission denied: 'fields/permx0.grdecl'

[valentin-krasontovitsch]

Solved by now merged work on enkfs and covered by tests merged in #4983