Public bug reported:
On xenial, ssh-keyscan returns zero indicating success, when the command
fails.
root@cp1:~# lsb_release -d
Description: Ubuntu 16.04.1 LTS
root@cp1:~# ssh-keyscan -H -t ssh-rsa bad-host
getaddrinfo bad-host: Name or service not known
root@cp1:~# echo $?
0
On trusty, the exit status is non-zero as expected.
root@integration-deployer:/home/ubuntu# lsb_release -d
Description: Ubuntu 14.04.5 LTS
root@integration-deployer:/home/ubuntu# ssh-keyscan -H -t ssh-rsa bad-host
getaddrinfo bad-host: Name or service not known
root@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
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