[Bug 1928687] [NEW] Avoid infinite loop on EOF on media change prompt

[Julian Andres Klode]

Public bug reported:

[Impact]
The cdrom media change prompt hangs on EOF. This causes the autopkgtest to hang when run in a debian lxd container for unknown reasons related to lxd/systemd isolation likely (it works fine in Ubuntu), but it's also surprising behavior in general.

[Test plan]
We did not really come up with a test for this except running autopkgtest -- lxd autopkgtest/debian/$suite/$arch. That being said, the change is minimal, and we do test the positive case in the test suite.

[Where problems could occur]
This change is isolated to the handling of pressing 'c' or hitting EOF inside the media change prompt, so any regressions would occur solely within that space. We do not foresee any regressions from the change as intended, as it seems unlikely that "hanging" is what you actually want.

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

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Title:
  Avoid infinite loop on EOF on media change prompt

Status in apt package in Ubuntu:
  New

Bug description:
  [Impact]
  The cdrom media change prompt hangs on EOF. This causes the autopkgtest to hang when run in a debian lxd container for unknown reasons related to lxd/systemd isolation likely (it works fine in Ubuntu), but it's also surprising behavior in general.

  [Test plan]
  We did not really come up with a test for this except running autopkgtest -- lxd autopkgtest/debian/$suite/$arch. That being said, the change is minimal, and we do test the positive case in the test suite.

  [Where problems could occur]
  This change is isolated to the handling of pressing 'c' or hitting EOF inside the media change prompt, so any regressions would occur solely within that space. We do not foresee any regressions from the change as intended, as it seems unlikely that "hanging" is what you actually want.

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