CHANGELOG.md

Changes

• Edited the template, so it puts out each line instead of inlining them.
• Used 4 interfaces instead of 2.

main.rb

require 'erubis'

def rand_ip
  4.times.map { rand(256) }.join('.')
end

class Context
  class Subnet
    attr_accessor :mask

    def initialize
      @mask = rand_ip
    end
  end

  class Interface
    @@index = 0

    attr_accessor :name
    attr_accessor :subnet
    attr_accessor :ip

    def initialize
      @name = "bleh-icedeth#{@@index+=1}"
      @ip = rand_ip
      @subnet = Subnet.new
    end
  end

  class Host
    attr_accessor :interfaces

    def initialize
      @interfaces = Array.new(4) { Interface.new }
    end
  end

  def initialize
    @host = Host.new
  end

  def b
    send(:binding)
  end
end

context = Context.new
t = Erubis::Eruby.new(File.read('template.erb'))
data = t.result(context.b)
File.write('result.sh', data)

result.sh

/bin/touch /etc/network/interfaces.d/icedeth1.conf
cat > /etc/network/interfaces.d/icedeth1.conf << EOF
auto icedeth1
    iface icedeth1 inet static
    address 35.71.230.154
    netmask 144.241.171.105
EOF


/bin/touch /etc/network/interfaces.d/icedeth2.conf
cat > /etc/network/interfaces.d/icedeth2.conf << EOF
auto icedeth2
    iface icedeth2 inet static
    address 58.5.114.167
    netmask 192.169.74.204
EOF


/bin/touch /etc/network/interfaces.d/icedeth3.conf
cat > /etc/network/interfaces.d/icedeth3.conf << EOF
auto icedeth3
    iface icedeth3 inet static
    address 159.88.80.141
    netmask 214.102.149.195
EOF


/bin/touch /etc/network/interfaces.d/icedeth4.conf
cat > /etc/network/interfaces.d/icedeth4.conf << EOF
auto icedeth4
    iface icedeth4 inet static
    address 204.196.69.29
    netmask 150.24.179.187
EOF

template.erb

<% @host.interfaces.each do |int| %>

<% intface = int.name.split('-')[-1] %>

/bin/touch /etc/network/interfaces.d/<%= intface %>.conf
cat > /etc/network/interfaces.d/<%= intface %>.conf << EOF
auto <%= intface %>
    iface <%= intface %> inet static
    address <%= int.ip %>
    netmask <%= int.subnet.mask %>
EOF
<% end %>