iTerm: Coprocess-script to auto-paste sudo password from keychain

README.rdoc

iTerm Coprocess-script to auto-paste sudo password from keychain¶ ↑

Usage¶ ↑

1. Open Keychain Access.app and create new object using the host as a name (“example.com”), username with sudo rights (“user”) and it’s password.

2. Add a trigger for iTerm’s profile (‘Advanced‘ tab):

   • Regular Expression: \$ sudo

   • Action: Run Coprocess…

   • Parameters: /path/to/iterm_reply_with_keychain.rb user@example.com

iterm_reply_with_keychain.rb

#!/usr/bin/env ruby -rexpect
# minimum ruby version: <b>2.0</b>

module Iterm
  # = Example usage:
  #
  # Run for example.com host, don't wait (default: wait 1 seconds), expect
  # line contains "[sudo] password for somebody" (default: the same)
  #
  #   Iterm::ReplyWithKeychain.("somebody@example.com", 0, "[sudo] password for %{user}")
  #
  # The same args from command line:
  #
  #   ./iterm_reply_with_keychain.rb somebody@example.com
  #
  class ReplyWithKeychain
    attr_accessor :user, :host, :expect_text, :expect_timeout

    def self.call(*args)
      new(*args).expect_and_auth
    end

    def initialize(uri, timeout = nil, pattern = "[sudo] password for %{user}")
      @user, @host    = uri.to_s.split "@"
      @expect_timeout = (timeout || 5).to_i
      @expect_text    = format pattern, user: user, host: host
    end

    def expect_and_auth(delay: 1)
      STDIN.expect expect_pattern, expect_timeout do |result|
        if !result.nil? && result.any?
          sleep(delay) if delay > 0
          STDOUT.puts pass_from_keychain
        end
      end
    end

    private
    def pass_from_keychain
      `security find-generic-password -a #{user} -l #{host} -w`.to_s.chomp
    end

    def expect_pattern
      Regexp.new Regexp.quote(expect_text)
    end
  end
end

Iterm::ReplyWithKeychain.(*ARGV)