Class: Hub::SshConfig

Inherits:
Object
  • Object
show all
Defined in:
lib/hub/ssh_config.rb

Overview

Reads ssh configuration files and records each setting under its host pattern so it can be looked up by hostname.

Defined Under Namespace

Classes: HostPattern

Constant Summary collapse

CONFIG_FILES = 
%w(~/.ssh/config /etc/ssh_config /etc/ssh/ssh_config)

Instance Method Summary collapse

Constructor Details

#initialize(files = nil) ⇒ SshConfig

Returns a new instance of SshConfig.



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# File 'lib/hub/ssh_config.rb', line 7

def initialize files = nil
  @settings = Hash.new {|h,k| h[k] = {} }
  Array(files || CONFIG_FILES).each do |path|
    file = File.expand_path path
    parse_file file if File.exist? file
  end
end

Instance Method Details

#get_value(hostname, key) ⇒ Object

Public: Get a setting as it would apply to a specific hostname.

Yields if not found.



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# File 'lib/hub/ssh_config.rb', line 18

def get_value hostname, key
  key = key.to_s.downcase
  @settings.each do |pattern, settings|
    if pattern.match? hostname and found = settings[key]
      return found
    end
  end
  yield
end

#parse_file(file) ⇒ Object 



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# File 'lib/hub/ssh_config.rb', line 60

def parse_file file
  host_patterns = [HostPattern.new('*')]

  IO.foreach(file) do |line|
    case line
    when /^\s*(#|$)/ then next
    when /^\s*(\S+)\s*=/
      key, value = $1, $'
    else
      key, value = line.strip.split(/\s+/, 2)
    end

    next if value.nil?
    key.downcase!
    value = $1 if value =~ /^"(.*)"$/
    value.chomp!

    if 'host' == key
      host_patterns = value.split(/\s+/).map {|p| HostPattern.new p }
    else
      record_setting key, value, host_patterns
    end
  end
end

#record_setting(key, value, patterns) ⇒ Object 



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# File 'lib/hub/ssh_config.rb', line 85

def record_setting key, value, patterns
  patterns.each do |pattern|
    @settings[pattern][key] ||= value
  end
end