[Bug 1974015] Re: apt.Cache(rootdir='/') causes PermissionError

[Benjamin Drung]

And apport should use `apt.Cache()` instead of `apt.Cache(rootdir='/')`.

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Title:
  apt.Cache(rootdir='/') causes PermissionError

Status in python-apt package in Ubuntu:
  Triaged

Bug description:
  The apport test case test_run_report_bug_kernel_thread fails in my
  schroot environment. My schroot environment has only one
  /etc/apt/sources.list.d/ubuntu.sources file and no
  /etc/apt/sources.list file.

  Running following test script as non-root will fail:

  ```
  #!/usr/bin/python3
  import apt
  apt.Cache(rootdir='/')
  ```

  $ ./test
  Traceback (most recent call last):
    File "./test", line 3, in <module>
      apt.Cache(rootdir='/')
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 143, in __init__
      self._check_and_create_required_dirs(rootdir)
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 186, in _check_and_create_required_dirs
      open(rootdir + f, "w").close()
  PermissionError: [Errno 13] Permission denied: '//etc/apt/sources.list'

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