Re: EEP Light: Option to override private key lookup when using Erlang ssh client

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Hi Vipin,

As I indicated when I closed your pull request, those options forces the
callback modules to handle options that might be strange for a certain
callback module. For example, the purpose of ssh_file is only to handle
keys in the way of OpenSSH.

You have correctly pointed out that to be able to write a specialized
callback module there is a need to have options passed to callbacks.

A more general way to pass options to the key callback module would be
to introduce a second form of the key_cb option:
  -  keep todays {key_cb, Module::atom()} to keep compatibility
  -  introduce the variant {key_cb, {Module::atom(), ModuleOptions}}

ModuleOptions has the usual list of {Tag,Value} format. That list is
passed in the Options argument of the callback functions as
    {key_cb_private,ModuleOptions}

The old
   {key_cb, Module::atom()}
could be transformed to
   {key_cb, {Module,[]}}
already in ssh:handle_options to make it cleaner inside.

In that way it is possible to write a callback module with whatever is
needed as private options.

-Hans



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