This change helps to avoid troubles like reported in #5018 and #4860.
Note that for sake of configuration simplicity, no new `ansible.timeout`
option has been added. The users who want to set a different value can
rely on `ansible.raw_arguments`.
This SSH option is always set, except when Vagrant is running from an
operating system fo the Solaris-family, as this parameter is not
supported by SunSSH. Logic taken from
bed1f8335f/lib/vagrant/util/ssh.rb (L116-L121)Fix#5017
/cc @sethvargo - Some weirdness here but overall should work fine. I'm
not sure if there was a GH issue this should be attached to or close. To
explain:
We just use the first machine with the default provider. A
Vagrant::Environment guarantees there is at least one machine, so
`env.machine_names.first` will always work. And we can just use the
default provider because we don't really care. Finally, it can be any
old machine we pass in because we just want the "global" config to
validate and there is no way to say "don't validate machine-specific
configs", so we might as well just pick the first machine to validate.
Like Vagrant's default SSH behaviors (e.g ssh or ssh-config commands),
the Ansible provisioner should by default not modify or read the user
known host file (e.g. ~/.ssh/known_hosts).
Given that `UserKnownHostsFile=/dev/null` SSH option is usually combined
with `StrictHostKeyChecking=no`, it seems quite reasonable to bind the
activation/disactivation of both options to `host_key_checking`
provisioner attribute.
For the records, a discussion held in Ansible-Development mailing list
clearly confirmed that there is no short-term plan to adapt Ansible to
offer an extra option or change the behavior of
ANSIBLE_HOST_KEY_CHECKING. For this reason, the current implementation
seems reasonable and should be stable on the long run.
Close#3900
Related References:
- https://groups.google.com/forum/#!msg/ansible-devel/iuoZs1oImNs/6xrj5oa1CmoJ
- https://github.com/ansible/ansible/issues/9442
Mitchell Hashimoto
Seth Vargo
Paul Hinze
Gilles Cornu
John Claus
Mitchell Hashimoto