Class: Confswap::Command

Inherits:
Clamp::Command
  • Object
show all
Defined in:
lib/confswap/command.rb

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Command

Returns a new instance of Command.



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# File 'lib/confswap/command.rb', line 8

def initialize *args
  @env_variables = {}
  super *args
end

Instance Method Details

#execute ⇒ Object 



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# File 'lib/confswap/command.rb', line 24

def execute
  if version?
    puts Confswap::VERSION
    return 0 
  end

  if yaml?
    save_as_yaml()
    return 0
  end

  if configuration_filename.nil?
    puts 'Specify a template file or use --help for usage information'
    return 0
  end

  if File.exists? configuration_filename
    swap_config configuration_filename
    return 0
  else
    puts "Error: Configuration template file with name #{configuration_filename} does not exist"
    return 1
  end
end

#gather_variables ⇒ Object 



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# File 'lib/confswap/command.rb', line 49

def gather_variables
  @env_variables = Confswap::EnvironmentVariableReader.read_variables unless ignore_persisted_shell_variables?

  if !property_file.nil? and File.exists? property_file
    @env_variables = Confswap::PropertyFileVariableReader.read_variables_from_file property_file
    puts @env_variables
  end

  process_envvars() if envvars
end

#help(*args) ⇒ Object 



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# File 'lib/confswap/command.rb', line 13

def help *args
  return [
    "This is confswap version #{Confswap::VERSION}",
    super
  ].join("\n")
end

#parse_envvars ⇒ Object 



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# File 'lib/confswap/command.rb', line 109

def parse_envvars
  parsed_variables = Confswap::BashParser.parse_user_input @env_variables
  puts "Interpreted user variables: #{parsed_variables}" if verbose?
  parsed_variables
end

#process_envvars ⇒ Object 



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# File 'lib/confswap/command.rb', line 76

def process_envvars
  envvars.each { |envvar|
    key_and_value = envvar.split(/=/, 2)
    key = key_and_value.first
    value = key_and_value.last
    if key_and_value.count != 2
      puts "Invalid envvar specified #{key} and #{value}"
      return 1
    end

    @env_variables[key.to_sym]=value
  }

  if verbose?
    puts "Environment variables:"
    @env_variables.each { |var|
      puts "#{var.first} = #{var.last}"
    }
  end
end

#run(*args) ⇒ Object 



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# File 'lib/confswap/command.rb', line 20

def run *args
  super *args
end

#save_as_yaml ⇒ Object 



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# File 'lib/confswap/command.rb', line 97

def save_as_yaml
  gather_variables()

  @env_variables = parse_envvars()

  output_filename_yaml = output_filename || 'conf.yaml'
  puts "Writing #{output_filename_yaml}"
  env_variables_yaml = @env_variables.to_yaml

  write_file env_variables_yaml, output_filename_yaml
end

#swap_config(configuration_filename) ⇒ Object 



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# File 'lib/confswap/command.rb', line 60

def swap_config configuration_filename
  output_filename_default = configuration_filename + '.out' if output_filename.nil?

  configuration_template = Confswap::ConfigurationFileReader.read configuration_filename
  gather_variables()
  
  begin
    output = configuration_template % @env_variables
  rescue KeyError => error
    puts "#{error.message}.  Your configuration requires this variable, but no environment variable was found or specified."
    exit(1)
  end

  write_file output, output_filename || output_filename_default
end

#write_file(output_file_contents, output_filename) ⇒ Object 



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# File 'lib/confswap/command.rb', line 115

def write_file output_file_contents, output_filename
  return File.write output_filename, output_file_contents unless File.exists? output_filename
  
  if File.exists? output_filename and force?
    puts "Overwriting #{output_filename}..."
    File.write output_filename, output_file_contents
  else
    puts "#{output_filename} already exists, use the --force flag to overwrite"
  end
end