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

[Colin Watson]

** Bug watch added: Debian Bug tracker #374980
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=374980

** Also affects: openssh (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=374980
   Importance: Unknown
       Status: Unknown

** Bug watch added: OpenSSH Portable Bugzilla #2903
   https://bugzilla.mindrot.org/show_bug.cgi?id=2903

** Also affects: openssh via
   https://bugzilla.mindrot.org/show_bug.cgi?id=2903
   Importance: Unknown
       Status: Unknown

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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 portable OpenSSH:
  Unknown
Status in openssh package in Ubuntu:
  New
Status in openssh package in Debian:
  Unknown

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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