[Bug 1661745] [NEW] ssh-keyscan does not exit with non-zero return code on error

[Luke Browning]

Public bug reported:

On xenial, ssh-keyscan returns zero indicating success, when the command
fails.

root at cp1:~# lsb_release -d
Description:	Ubuntu 16.04.1 LTS

root at cp1:~# ssh-keyscan -H -t ssh-rsa bad-host
getaddrinfo bad-host: Name or service not known
root at cp1:~# echo $?
0

On trusty, the exit status is non-zero as expected.

root at integration-deployer:/home/ubuntu# lsb_release -d
Description:	Ubuntu 14.04.5 LTS

root at integration-deployer:/home/ubuntu# ssh-keyscan -H -t ssh-rsa bad-host
getaddrinfo bad-host: Name or service not known
root at integration-deployer:/home/ubuntu# echo $?
255

This is a incompatibility between Ubuntu 14.04 and 16.04

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

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https://bugs.launchpad.net/bugs/1661745

Title:
  ssh-keyscan does not exit with non-zero return code on error

Status in openssh package in Ubuntu:
  New

Bug description:
  On xenial, ssh-keyscan returns zero indicating success, when the
  command fails.

  root at cp1:~# lsb_release -d
  Description:	Ubuntu 16.04.1 LTS

  root at cp1:~# ssh-keyscan -H -t ssh-rsa bad-host
  getaddrinfo bad-host: Name or service not known
  root at cp1:~# echo $?
  0

  On trusty, the exit status is non-zero as expected.

  root at integration-deployer:/home/ubuntu# lsb_release -d
  Description:	Ubuntu 14.04.5 LTS

  root at integration-deployer:/home/ubuntu# ssh-keyscan -H -t ssh-rsa bad-host
  getaddrinfo bad-host: Name or service not known
  root at integration-deployer:/home/ubuntu# echo $?
  255

  This is a incompatibility between Ubuntu 14.04 and 16.04

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