[BUG] Permission denied: '/proc/partitions' in snap version (Solved: Reading the snap instructions)

[Daniel-at-github]

Describe the bug

In snap (ver. 1.0.2 of 2020-08-04) Exits after initial checks with a PermissionError: [Errno 13] Permission denied: '/proc/partitions'

To Reproduce

snap install bpytop
bpytop
cat ~/snap/bpytop/58/.config/bpytop/error.log

Expected behavior

Start functioning and then show the graphics without crashing.

Screenshots

Only ascii in the issue, after breaking at 86% at startup "Collecting...":

$ bpytop 
Bpytop exited with errorcode (1). See ~/snap/bpytop/58/.config/bpytop/error.log for more information!

Info (please complete the following information):

• bpytop version: 1.0.2

• psutil version: 5.4.2 inside the snap (version 5.7.0 or above is required) ⚠️ 🤔 Maybe the bug is here?

• psutil version: bpytop -v (version 5.7.0 or above is required)

• (Linux) Linux distribution and version: Ubuntu 16.04.7 LTS (snap based in core18)

• Terminal used: GNOME Terminal 3.18.3

• Font used:

• Python version, python3 --version (version 3.6 or above is required): No idea on ow to look in the snap

# snap info bpytop 
name:      bpytop
summary:   A Python-based resource monitor for your terminal
publisher: James Tigert (kz6fittycent)
store-url: https://snapcraft.io/bpytop
contact:   https://github.com/kz6fittycent/bpytop-snap
license:   Apache-2.0
description: ...
commands:
  - bpytop
snap-id:      iH0DT1txUogChVISBwaxXrKZVCXifuTL
tracking:     latest/stable
refresh-date: today at 11:26 CEST
channels:
  latest/stable:    1.0.2 2020-08-04 (58) 9MB -
  latest/candidate: ↑                         
  latest/beta:      ↑                         
  latest/edge:      1.0.2 2020-08-04 (58) 9MB -
installed:          1.0.2            (58) 9MB -

Additional context

contents of ~/.config/bpytop/error.log

$ cat ~/snap/bpytop/58/.config/bpytop/error.log
08/08/20 (11:31:08) | ERROR: Data collection thread failed with exception: [Errno 13] Permission denied: '/proc/partitions'
Traceback (most recent call last):
  File "/snap/bpytop/58/usr/bin/bpytop", line 2319, in _runner
    collector._collect()
  File "/snap/bpytop/58/usr/bin/bpytop", line 2602, in _collect
    io_counters = psutil.disk_io_counters(perdisk=True if SYSTEM == "Linux" else False, nowrap=True)
  File "/snap/bpytop/58/usr/lib/python3/dist-packages/psutil/__init__.py", line 2014, in disk_io_counters
    rawdict = _psplatform.disk_io_counters()
  File "/snap/bpytop/58/usr/lib/python3/dist-packages/psutil/_pslinux.py", line 1040, in disk_io_counters
    partitions = get_partitions()
  File "/snap/bpytop/58/usr/lib/python3/dist-packages/psutil/_pslinux.py", line 1022, in get_partitions
    with open_text("%s/partitions" % get_procfs_path()) as f:
  File "/snap/bpytop/58/usr/lib/python3/dist-packages/psutil/_pslinux.py", line 201, in open_text
    return open(fname, "rt", **kwargs)
PermissionError: [Errno 13] Permission denied: '/proc/partitions'
08/08/20 (11:31:08) | WARNING: Exiting with errorcode (1). Runtime 0:00:08 

[aristocratos]

I'm not the maintainer for the snap package.

https://github.com/kz6fittycent/bpytop-snap

Did you follow the instructions?

[Daniel-at-github]

My bad 😇
Thanks for pointing it out.

If you want to implement an automatic warning for snap installers, it could be something like:

if 'snap' in error_log_path and not proc_partitions_readable():
  warn_and_exit("Detected half installed snap, read the instructions in https://github.com/kz6fittycent/bpytop-snap")

[aristocratos]

I would rather discourage from installing through any packaging system not automatically synced with the git repo tagged releases, at least not until the project has matured a bit and most of the common bugs have been fixed.

That's why I haven't included any external installation methods in the README.md yet. Could possibly included the AUR repository for arch since it pulls directly from git.