(#28) Add new ssh command to vmfloaty

This commit adds a new feature to vmfloaty. It grabs a single vm from
the pooler based on the os template provided and then attempts to ssh
into it from the host machine.

lib/vmfloaty.rb

@@ -8,6 +8,7 @@ require 'vmfloaty/pooler'
 require 'vmfloaty/version'
 require 'vmfloaty/conf'
 require 'vmfloaty/utils'
+require 'vmfloaty/ssh'
 
 class Vmfloaty
   include Commander::Methods
@@ -50,6 +51,9 @@ class Vmfloaty
           else
             unless token
               puts "No token found. Retrieving a token..."
+              if !user
+                raise "You did not provide a user to authenticate to vmpooler with"
+              end
               pass = password "Enter your password please:", '*'
               token = Auth.get_token(verbose, url, user, pass)
               puts "\nToken retrieved!"
@@ -345,6 +349,46 @@ class Vmfloaty
       end
     end
 
+    command :ssh do |c|
+      c.syntax = 'floaty ssh os_type'
+      c.summary = 'Grabs a single vm and sshs into it'
+      c.description = ''
+      c.example 'SSHs into a centos vm', 'floaty ssh centos7 --url https://vmpooler.example.com'
+      c.option '--verbose', 'Enables verbose output'
+      c.option '--url STRING', String, 'URL of vmpooler'
+      c.option '--user STRING', String, 'User to authenticate with'
+      c.option '--token STRING', String, 'Token for vmpooler'
+      c.option '--notoken', 'Makes a request without a token'
+      c.action do |args, options|
+        verbose = options.verbose || config['verbose']
+        url = options.url ||= config['url']
+        token = options.token ||= config['token']
+        user = options.user ||= config['user']
+        no_token = options.notoken
+
+        if args.empty?
+          STDERR.puts "No operating systems provided to obtain. See `floaty ssh --help` for more information on how to get VMs."
+          exit 1
+        end
+
+        host_os = args.first
+
+        if !no_token && !token
+          puts "No token found. Retrieving a token..."
+          if !user
+            raise "You did not provide a user to authenticate to vmpooler with"
+          end
+          pass = password "Enter your password please:", '*'
+          token = Auth.get_token(verbose, url, user, pass)
+          puts "\nToken retrieved!"
+          puts token
+        end
+
+        Ssh.ssh(verbose, host_os, token, url)
+        exit 0
+      end
+    end
+
     run!
   end
 end

lib/vmfloaty/ssh.rb

@@ -0,0 +1,43 @@
+class Ssh
+
+  def self.which(cmd)
+    # Gets path of executable for given command
+
+    exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
+    ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
+      exts.each { |ext|
+        exe = File.join(path, "#{cmd}#{ext}")
+        return exe if File.executable?(exe) && !File.directory?(exe)
+      }
+    end
+    return nil
+  end
+
+  def self.ssh(verbose, host_os, token, url)
+    ssh_path = which("ssh")
+    if !ssh_path
+      raise "Could not determine path to ssh"
+    end
+    os_types = {}
+    os_types[host_os] = 1
+
+    response = Pooler.retrieve(verbose, os_types, token, url)
+    if response["ok"] == true
+      if host_os =~ /win/
+        user = "Administrator"
+      else
+        user = "root"
+      end
+
+      hostname = "#{response[host_os]["hostname"]}.#{response["domain"]}"
+      cmd = "#{ssh_path} #{user}@#{hostname}"
+
+      # TODO: Should this respect more ssh settings? Can it be configured
+      #       by users ssh config and does this respect those settings?
+      Kernel.exec(cmd)
+    else
+      raise "Could not get vm from vmpooler:\n #{response}"
+    end
+    return
+  end
+end