[Bug 2067361] Re: Programs using netrc with containing an entry without a password fail with an exception "malformed machine entry <> terminated by ''"

[Eero Aaltonen]

I reviewed the tests and added a test case for when an entry does not
have a password. Also changed the patch to return None rather that "",
which is expected by the current tests. Apparently I should've checked
those manually as that was not caught automatically.

This also simplifies the actual patch even more, and should now be in
good shape.

** Patch added: "patch-V3"
   https://bugs.launchpad.net/ubuntu/+source/python3.10/+bug/2067361/+attachment/5793097/+files/netrc-relax-parsing-3.diff

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https://bugs.launchpad.net/bugs/2067361

Title:
  Programs using netrc with containing an entry without a password fail
  with an exception "malformed machine entry <> terminated by ''"

Status in python3.10 package in Ubuntu:
  Incomplete
Status in python3.10 source package in Jammy:
  New

Bug description:
  Some services use provide token authentication, where the users token is input as the "username" field, resulting in a netrc entry containing
  ```
  machine SOME_ADDRESS
  login SOME_TOKEN
  ```

  but no password entry.

  Trying to run some python based program, that uses netrc, such as
  ```
  ansible-galaxy collection install SOME_PACKAGE
  ```

  with this such a netrc file will fail with an exception
  "malformed machine entry SOME_ADDRESS terminated by ''".

  This is upstream bug https://bugs.python.org/issue34908 fixed in
  python3.11.

  [ Impact ]

   * Users are not able to run Python based programs using netrc
  credentials, such as ansible.

  [ Test Plan ]

   * Install ansible with `sudo apt install ansible`

   * Add an entry to ~/.netrc containing only the "machine" and "login"
  tokens

   * observe failure when trying to run `ansible-galaxy collection
  install community.crypto`

  [ Where problems could occur ]

   * Some over specific test suite relying on current overly strict
  parsing. However such a test suite would have to be fixed for
  python3.11 anyway.

  [ Other Info ]

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