[Bug 903996] [NEW] Recognize if apt isn't on a tty, don't wait for input

[Drew Mazurek]

Public bug reported:

If apt-get or apt-add-repository don't have a tty and are being run non-
interactively (e.g. through cloud-init), they will hang waiting for
confirmation if the user doesn't specify -y.  Ideally they should either
fail and log that the user must specify -y, or succeed without trying to
grab the user's input.

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

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https://bugs.launchpad.net/bugs/903996

Title:
  Recognize if apt isn't on a tty, don't wait for input

Status in “apt” package in Ubuntu:
  New

Bug description:
  If apt-get or apt-add-repository don't have a tty and are being run
  non-interactively (e.g. through cloud-init), they will hang waiting
  for confirmation if the user doesn't specify -y.  Ideally they should
  either fail and log that the user must specify -y, or succeed without
  trying to grab the user's input.

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