Class: Subspace::Inventory

Inherits:
Object
  • Object
show all
Defined in:
lib/subspace/inventory.rb

Defined Under Namespace

Classes: Group, Host

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Inventory

Returns a new instance of Inventory.



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# File 'lib/subspace/inventory.rb', line 5

def initialize
  @hosts = {}
  @group_vars = {}
  @global_vars = {}
end

Instance Attribute Details

#global_vars ⇒ Object

Returns the value of attribute global_vars.



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# File 'lib/subspace/inventory.rb', line 4

def global_vars
  @global_vars
end

#group_vars ⇒ Object

Returns the value of attribute group_vars.



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# File 'lib/subspace/inventory.rb', line 4

def group_vars
  @group_vars
end

#hosts ⇒ Object

Returns the value of attribute hosts.



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# File 'lib/subspace/inventory.rb', line 4

def hosts
  @hosts
end

#path ⇒ Object

Returns the value of attribute path.



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# File 'lib/subspace/inventory.rb', line 4

def path
  @path
end

Class Method Details

.read(path) ⇒ Object 



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# File 'lib/subspace/inventory.rb', line 25

def self.read(path)
  inventory = new
  inventory.path = path

  yml = YAML.load(File.read(path)).to_h

  # Run through all hosts
  yml["all"]["hosts"].each do |name, vars|
    inventory.hosts[name] = Host.new(name, vars: vars || {})
  end

  # Run through all children (groups)
  # This does NOT handle sub-groups yet
  yml["all"]["children"].each do |name, group|
    next unless group["hosts"]

    # Each group defines its host membership
    group["hosts"].each do |host, vars|
      inventory.hosts[host] ||= Host.new(host, vars: vars || {})
      inventory.hosts[host].group_list.push name
    end

    if group["vars"]
      inventory.group_vars[name] = group["vars"]
    end
  end

  # Capture global variables
  inventory.global_vars = yml["all"]["vars"] || {}

  inventory
end

Instance Method Details

#find_hosts!(host_spec) ⇒ Object

Find all the hosts in the host/group or exit



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# File 'lib/subspace/inventory.rb', line 12

def find_hosts!(host_spec)
  if self.groups[host_spec]
    return self.groups[host_spec].host_list.map { |m| self.hosts[m] }
  elsif self.hosts[host_spec]
    return [self.hosts[host_spec]]
  else
    say "No inventory matching: '#{host_spec}' found. "
    say (["Available hosts:"] + self.hosts.keys).join("\n\t")
    say (["Available groups:"] + self.groups.keys).join("\n\t")
    exit
  end
end

#groups ⇒ Object 



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# File 'lib/subspace/inventory.rb', line 112

def groups
  @groups ||= begin
    all_groups = {"all" => Group.new("all", vars: {}, host_list: hosts.keys) }
    @hosts.each do |name, host|
      host.group_list.each do |group|
        all_groups[group] ||= Group.new(group, vars: @group_vars[group])
        all_groups[group].host_list.append(name)
      end
    end
    all_groups
  end
end

#merge(inventory_json) ⇒ Object 



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# File 'lib/subspace/inventory.rb', line 62

def merge(inventory_json)
  inventory_json["hostnames"].each_with_index do |host, i|
    if hosts[host]
      old_ip = hosts[host].vars["ansible_host"]
      new_ip = inventory_json["ip_addresses"][i]
      if old_ip != new_ip
        say "  * Host '#{host}' IP address changed! You may need to update the inventory! (#{old_ip} => #{new_ip})"
      end
      next
    end
    hosts[host] = Host.new(host)
    hosts[host].vars["ansible_host"] = inventory_json["ip_addresses"][i]
    hosts[host].vars["ansible_user"] = inventory_json["users"][i]
    hosts[host].vars["hostname"] = host
    hosts[host].group_list = inventory_json["groups"][i].split(/\s/)
  end
end

#to_yml ⇒ Object 



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# File 'lib/subspace/inventory.rb', line 80

def to_yml
  all_groups = {}
  all_hosts = {}
  @hosts.each do |name, host|
    all_hosts[host.name] = host.vars.empty? ? nil : host.vars.transform_keys(&:to_s)
    host.group_list.each do |group|
      all_groups[group] ||= { "hosts" => {}}
      all_groups[group]["hosts"][host.name] = nil
    end
  end

  @group_vars.each do |group, vars|
    all_groups[group] ||= {}
    if !vars.empty?
      all_groups[group]["vars"] = vars.transform_keys(&:to_s)
    end
  end

  yml = {
    "all" => {
      "hosts" => all_hosts,
      "children" => all_groups.empty? ? nil : all_groups
    }
  }

  if !@global_vars.empty?
    yml["all"]["vars"] = @global_vars.transform_keys(&:to_s)
  end

  YAML.dump(yml)
end

#write(path = nil) ⇒ Object 



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# File 'lib/subspace/inventory.rb', line 58

def write(path=nil)
  File.write(@path || path, self.to_yml)
end