A wercker step to use ssh-keyscan to add a host to the known_hosts file.

Important! Use the fingerprint parameter, otherwise a man-in-the-middle attack is possible.

• Fix issue if server returns multiple keys and fingerprint was used

• hostname (required) The hostname to scan for a public ssh key.
• fingerprint (optional) Only add the public key to known_hosts if it matches this fingerprint.
• port (optional) Probe the ssh server on the following port.
• local (optional) Default: false. Set to true to add the known_host to the local known_hosts file.

Probe the host ssh.example.com for it's public key and see if the fingerprint matches ce:83:e9:7d:02:a4:e3:63:3f:8a:07:cc:d5:d9:bb:cd

deploy:
  steps:
    - add-to-known_hosts:
        hostname: ssh.example.com
        fingerprint: ce:83:e9:7d:02:a4:e3:63:3f:8a:07:cc:d5:d9:bb:cd

...

The MIT License (MIT)

Copyright (c) 2013 wercker

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

• Fix issue if server returns multiple keys and fingerprint was used

• Add fingerprints to global file

• Implement filter by fingerprint
• Implement port

• Initial release