[Bug 1780099] [NEW] Cache remapping breaks hashing of Package objects

[Julian Andres Klode]

Public bug reported:

[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)

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

** Affects: python-apt (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: python-apt (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Also affects: python-apt (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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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:
  New
Status in python-apt source package in Bionic:
  New

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)

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

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