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[Gioele Barabucci <1323586@xxxxxxxxxxxxxxxxxx>]

It may not be a bug in python-apt, but it is a bug nevertheless. If
unreadable files are not supported, the applications should ignore them
or complain about them, not crash and raise an apport dialog every hour.

Please note that it is very easy to generate files in `sources.list.d`
that are not readable by normal users. Just use `sudo apt-add-
repository` and a 077 umask.

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https://bugs.launchpad.net/bugs/1323586

Title:
  oneconf crashes if one apt list file is unreadable

Status in oneconf package in Ubuntu:
  Confirmed
Status in python-apt package in Ubuntu:
  Won't Fix

Bug description:
  oneconf-service will crash if one of the files in
  `/etc/apt/sources.list.d` is unreadable (for example because it has
  been created using sudo and umask 077).

  In my case this is the error message

      Traceback (most recent call last):
        File "/usr/lib/python3/dist-packages/oneconf/packagesethandler.py", line 63, in update
          newpkg_list = self.distro.compute_local_packagelist()
        File "/usr/lib/python3/dist-packages/oneconf/distributor/Ubuntu.py", line 42, in compute_local_packagelist
          with apt.Cache() as apt_cache:
        File "/usr/lib/python3/dist-packages/apt/cache.py", line 107, in __init__
          self.open(progress)
        File "/usr/lib/python3/dist-packages/apt/cache.py", line 155, in open
          self._list.read_main_list()
      SystemError: E:Opening /etc/apt/sources.list.d/tor.list - ifstream::ifstream (13: Permission denied)

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