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

[Scott Moser]

For what its worth,  The command *does* do what the user asked.
sudo apt-add-repository ppa:awstools-dev/awstools </dev/null

will just do what you wanted.

This was virtually required in order to have backwards compatibility to
scripts that used this.

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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 “software-properties” package in Ubuntu:
  Invalid

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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