[Bug 1724342] Re: test_drop_privileges AssertionError groups mismatch

[OpenStack Infra]

Fix proposed to branch: master
Review: https://review.openstack.org/512797

** Changed in: swift
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1724342

Title:
  test_drop_privileges AssertionError groups mismatch

Status in OpenStack Object Storage (swift):
  In Progress
Status in swift package in Ubuntu:
  Triaged

Bug description:
  This test is failing in Ubuntu builds on Artful. However I think it
  generally just gets lucky when it is successful.

  ======================================================================
  FAIL: test_drop_privileges (test.unit.common.test_utils.TestUtils)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/<<PKGBUILDDIR>>/test/unit/common/test_utils.py", line 2151, in test_drop_privileges
      self.assertEqual(set(groups), set(os.getgroups()))
  AssertionError: Items in the second set but not the first:
  110
      """Fail immediately, with the given message."""
  >>  raise self.failureException('Items in the second set but not the first:\n110')

  
  It seems that setgroups() is mocked out. Part of what drop_privileges() does is:

      groups = [g.gr_gid for g in grp.getgrall() if user in g.gr_mem]
      os.setgroups(groups)

  The failing part of test_drop_privileges() is:

      groups = [g.gr_gid for g in grp.getgrall() if user in g.gr_mem]
      groups.append(pwd.getpwnam(user).pw_gid)
      self.assertEqual(set(groups), set(os.getgroups()))

  The test is trying to assert that os.getgroups() was set in
  drop_privileges. However os.getgroups() can't change since
  os.setgroups() is mocked out, and os.getgroups() isn't mocked out.

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