[Bug 1780099] Re: Cache remapping breaks hashing of Package objects

[Łukasz Zemczak]

Hello Julian, or anyone else affected,

Accepted python-apt into bionic-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/python-apt/1.6.2 in
a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: python-apt (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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https://bugs.launchpad.net/bugs/1780099

Title:
  Cache remapping breaks hashing of Package objects

Status in python-apt package in Ubuntu:
  Fix Committed
Status in python-apt source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  The apt.Package objects use the id as the hash, but the hash can change after reopening, meaning that code will fail to work, for example:

  c=apt.Cache()
  p=c["a"]
  set_of_p={p}
  c.open()
  assert p in set_of_p

  will fail.

  [Test case]
  The above test case is run as part of autopkgtest (syntax is slightly different), so passing autopkgtests means verification is done.

  [Regression potential]
  Hashing packages objects will be slower as it hashes the name and architecture now.

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