[Bug 1359590] [NEW] Getty's on serial consoles need to be consistent

[Mark Shuttleworth]

Public bug reported:

In our cloud images today we launch a getty on ttyS0, as long as it's
not in a container. We don't launch a getty on ttyS1-n even if they
exist.

In MAAS, which also uses cloud images, it would often be useful to put
getty's on the serial port that is mapped to remote serial access, such
as IPMI SOL. It is however difficult to know which is the correct getty.

Broadly speaking I think we should have a consistent approach to
getty's. That might mean:

 * launch a getty on each ttySn that passes an stty test (as per ttyS0 currently)
 * allow cloud-init to prevent some of those, via vendordata or userdata or default behaviour per-cloud

or

 * launch no getty's on ttyS, but
 * allow cloud-init to create them based on vendordata or userdata or default behaviour per-cloud

** Affects: cloud-init
     Importance: Undecided
         Status: New

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: cloud-init
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1359590

Title:
  Getty's on serial consoles need to be consistent

Status in Init scripts for use on cloud images:
  New
Status in “util-linux” package in Ubuntu:
  New

Bug description:
  In our cloud images today we launch a getty on ttyS0, as long as it's
  not in a container. We don't launch a getty on ttyS1-n even if they
  exist.

  In MAAS, which also uses cloud images, it would often be useful to put
  getty's on the serial port that is mapped to remote serial access,
  such as IPMI SOL. It is however difficult to know which is the correct
  getty.

  Broadly speaking I think we should have a consistent approach to
  getty's. That might mean:

   * launch a getty on each ttySn that passes an stty test (as per ttyS0 currently)
   * allow cloud-init to prevent some of those, via vendordata or userdata or default behaviour per-cloud

  or

   * launch no getty's on ttyS, but
   * allow cloud-init to create them based on vendordata or userdata or default behaviour per-cloud

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