Class: Semi::Driver

Inherits:
Object
  • Object
show all
Defined in:
lib/semi/driver.rb

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ Driver

Returns a new instance of Driver.



7
8
9
 
# File 'lib/semi/driver.rb', line 7

def initialize(path)
  @config = Semi::Config.new(path)
end

Instance Method Details

#start(args) ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
 
# File 'lib/semi/driver.rb', line 11

def start(args)
  # Initialize the dictionary with the defaults
  @dictionary = {}
  @config.defaults.each_pair do |name,val|
    hints = @config.validators[name] || nil
    @dictionary[name.downcase] = Semi::Variable.import(val, hints)
  end

  # Now manually merge in the env vars
  ENV.each_pair do |name, val|
    hints = @config.validators[name] || nil
    @dictionary[name.downcase] = Semi::Variable.import(val, hints)
  end

  # Now that all values should be present in @dictionary, do any expansions
  @dictionary.each_pair do |name, val|
    @dictionary[name] = Semi::Variable.expand(val, @dictionary)
  end

  # Check any validations being asserted
  @config.validators.each_key { |key|
    begin
      Semi::validate(@dictionary[key.downcase], @config.validators[key])
    rescue Semi::ValidationError => err
      if @dictionary.include? key
        puts "Can not validate #{key}: #{err}"
      elsif @config.validators[key].include? 'required'
        puts "#{key} is a required value, but it was not found."
        exit(5)
      end
    end
  }

  # prepare the dictionary for the templates
  @dictionary = OpenStruct.new(@dictionary)

  # Process the config files and generate final versions
  begin
    @config.files.each do |file|
      # Read the template file and render
      @config.process_file(file, @dictionary)
    end
  rescue NoMethodError
    puts "files key in semi.conf does not contain an array of files."
    exit (6)
  end

  # Replace ENV with @dictionary
  @dictionary.each_pair {|k,v| ENV[k.to_s] = v.to_s}

  # Check for pre-defined commands
  if ENV['SEMI_DEBUG']
    puts "Semi debug:: args = #{args.inspect}"
  end
  if args.count == 0 and @config.commands.include? 'default'
    args = @config.commands['default']
  elsif args.count == 1 and args[0] == 'help'
    puts "This container also supports the following commands:"
    puts""
    printf("  %-10s||   %s\n", 'Command', 'Actual command run / description')
    puts "---------------------------------------------------------------"
    @config.commands.each_pair do |cmd, cmd_line|
      printf("  %-10s   => %s\n", cmd, cmd_line)
    end
    printf("  %-10s   => %s\n", 'help', 'List shortcut and additional commands')
    exit(0)
  elsif @config.commands.include? args[0]
    args = [@config.commands[args[0]], args[1..-1]].flatten
  end

  # Execute the command line
  if ENV['SEMI_DEBUG']
    puts "Semi debug:: executing: #{args}"
  end
  begin
    exec([args].flatten.join(' '))
  rescue SystemCallError => e
    if e.errno == Errno::ENOENT
      puts "Command not found: executing: #{args}"
    else
      puts "Unknown system call failure: #{e.inspect}"
    end
    exit(e.errno)
  rescue Exception => e
    puts "Unknown exception: #{e.inspect}"
    exit(99)
  end
end