[Bug 1965568] Re: missing dependency on python3-dbus

[Nick Rosbrook]

** Description changed:

+ [Impact]
+ 
+ If a user does not have the python3-dbus package installed, the upgrade
+ will fail trying to `import dbus`.
+ 
+ [Test Plan]
+ 
+ * On an Impish host, remove python3-dbus. Note that python3-distupgrade
+ is NOT listed in the warning from dpkg.
+ 
+   $ sudo dpkg -r --force-depends python3-dbus
+ 
+ * Attempt an upgrade, and observe the "ModuleNotFoundError: No module
+ named 'dbus'" exception.
+ 
+   $ do-release-upgrade
+ 
+ [Where problems could occur]
+ 
+ The patch moves the `import dbus` statement to later in the code, so if
+ another part of that source file needed the dbus module, exceptions
+ would occur.
+ 
+ [Original Description]
+ 
  When I try to execute `do-release-upgrade -d` on a 20.04 system, the
  following fatal error occured.
  
  Traceback (most recent call last):
  
  File "/tmp/ubuntu-release-upgrader-yqb1e837/jammy", line 8, in
  <module>
  sys.exit(main())
  
  File
  "/tmp/ubuntu-release-upgrader-yqb1e837/DistUpgrade/DistUpgradeMain.py",
  line 222, in main
  from .DistUpgradeController import DistUpgradeController
  
  File
  "/tmp/ubuntu-release-upgrader-yqb1e837/DistUpgrade/DistUpgradeController.py",
  line 25, in <module>
  import dbus
  
  ModuleNotFoundError: No module named 'dbus'

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https://bugs.launchpad.net/bugs/1965568

Title:
  missing dependency on python3-dbus

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader source package in Jammy:
  Triaged
Status in ubuntu-release-upgrader source package in Kinetic:
  Triaged

Bug description:
  [Impact]

  If a user does not have the python3-dbus package installed, the
  upgrade will fail trying to `import dbus`.

  [Test Plan]

  * On an Impish host, remove python3-dbus. Note that
  python3-distupgrade is NOT listed in the warning from dpkg.

    $ sudo dpkg -r --force-depends python3-dbus

  * Attempt an upgrade, and observe the "ModuleNotFoundError: No module
  named 'dbus'" exception.

    $ do-release-upgrade

  [Where problems could occur]

  The patch moves the `import dbus` statement to later in the code, so
  if another part of that source file needed the dbus module, exceptions
  would occur.

  [Original Description]

  When I try to execute `do-release-upgrade -d` on a 20.04 system, the
  following fatal error occured.

  Traceback (most recent call last):

  File "/tmp/ubuntu-release-upgrader-yqb1e837/jammy", line 8, in
  <module>
  sys.exit(main())

  File
  "/tmp/ubuntu-release-upgrader-yqb1e837/DistUpgrade/DistUpgradeMain.py",
  line 222, in main
  from .DistUpgradeController import DistUpgradeController

  File
  "/tmp/ubuntu-release-upgrader-yqb1e837/DistUpgrade/DistUpgradeController.py",
  line 25, in <module>
  import dbus

  ModuleNotFoundError: No module named 'dbus'

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