Net::SSH does not understand Match blocks

[djwmarks]

I have an SSH configuration including a Match Host block, like the following:

Match Host *.foobar.com
  ProxyCommand command-to-run

The ProxyCommand is only valid within the Match Host context, yet it is configured for every host.

irb(main):001:0> require "net/ssh"
=> true
irb(main):002:0> Net::SSH::Config.for("127.0.0.1")
=> {:auth_methods=>[...], :proxy=>#<Net::SSH::Proxy::Command:0x007f9c0bb5c1e8 @command_line_template="...", @command_line=nil>, :user=>"...", :keys=>["..."], :send_env=>[/^LANG$/, /^LC_.*$/]}

I could maintain separate configuration files but that rather defeats the point of having a configuration parser. Of course the ideal would be that Net::SSH understands the complete syntax. However, if Net::SSH can't understand the full gamut of SSH configuration options, perhaps you could add a methods of blacklisting specific lines as a compromise? Something akin to Rubocop directives, e.g.:

# Net::SSH::Config ignore
Match Host *.foobar.com
  ProxyCommand command-to-run
# Net::SSH::Config clear

This would give people a workaround for future syntax changes as well while the parser catches up.

Cheers

[djwmarks]

PR #413

[mfazekas]

See also #593