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In order to clone a git repository using the ssh protocol, one must accept to connect to the remote service as must be done when using ssh alone. Since it's an interactive operation that is not possible when in an init container, one solution is to provide the known_hosts files through a ConfigMap containing a list of validated hosts.
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Describe your changes
This PR implements ssh's known_hosts handling to allow cloning git repositories using the ssh protocol.
In this initial implementation, the admin can create a ConfigMap object named
ssh-known-hostscontaining a key namedknown_hostswhich content should be the same as a standard known_hosts file.The content can be generate using
ssh-keyscanfollowed by the name of the git service of interest (for example GitHub, GitLab, Bitbucket, etc.).This method allows for both public and private git services to be used.
Issue ticket number and link
Fixes: #700
Part of SwissDataScienceCenter/renku#3679