(#13974) Add predicate functions for interface facts

If one wishes to test if a host has a particular IP address (such as a floating
virtual address) or has an interface on a particular network (such as a
secondary management network), the facts that provide this information are
difficult to use within Puppet.

This patch addresses these needs by implementing functions
‘has_ip_address(value)’ and ‘has_ip_network(value)’. These functions look
through all interfaces for ipaddress_<interface> and network_<interface>
(respectively) having the requested <value>.

These functions are implemented on top of a lower-level predicate
function, ‘has_interface_with(kind, value)’, which iterates through the
interfaces in the ‘interfaces’ fact and checks the facts <kind>_<interface>
looking for <value>.

Additionally, the existence of a particular named interface can be checked for
by calling with only a single argument: has_interface_with(interface).

A Boolean is returned in all cases.

1 files changed, 39 insertions, 0 deletions

diff --git a/spec/unit/puppet/parser/functions/has_ip_address_spec.rb b/spec/unit/puppet/parser/functions/has_ip_address_spec.rb
new file mode 100755
index 0000000..5a68460
--- /dev/null
+++ b/spec/unit/puppet/parser/functions/has_ip_address_spec.rb
@@ -0,0 +1,39 @@
+#!/usr/bin/env ruby -S rspec
+require 'spec_helper'
+
+describe Puppet::Parser::Functions.function(:has_ip_address) do
+
+  let(:scope) do
+    PuppetlabsSpec::PuppetInternals.scope
+  end
+
+  subject do
+    function_name = Puppet::Parser::Functions.function(:has_ip_address)
+    scope.method(function_name)
+  end
+
+  context "On Linux Systems" do
+    before :each do
+      scope.stubs(:lookupvar).with('interfaces').returns('eth0,lo')
+      scope.stubs(:lookupvar).with('ipaddress').returns('10.0.2.15')
+      scope.stubs(:lookupvar).with('ipaddress_eth0').returns('10.0.2.15')
+      scope.stubs(:lookupvar).with('ipaddress_lo').returns('127.0.0.1')
+    end
+
+    it 'should have primary address (10.0.2.15)' do
+      subject.call(['10.0.2.15']).should be_true
+    end
+
+    it 'should have lookupback address (127.0.0.1)' do
+      subject.call(['127.0.0.1']).should be_true
+    end
+
+    it 'should not have other address' do
+      subject.call(['192.1681.1.1']).should be_false
+    end
+
+    it 'should not have "mspiggy" on an interface' do
+      subject.call(['mspiggy']).should be_false
+    end
+  end
+end