new lxd provisioner

Author: h0tw1r3

lib/task_helper.rb

@@ -9,7 +9,15 @@ def get_inventory_hash(inventory_full_path)
   if File.file?(inventory_full_path)
     inventory_hash_from_inventory_file(inventory_full_path)
   else
-    { 'version' => 2, 'groups' => [{ 'name' => 'docker_nodes', 'targets' => [] }, { 'name' => 'ssh_nodes', 'targets' => [] }, { 'name' => 'winrm_nodes', 'targets' => [] }] }
+    {
+      'version' => 2,
+      'groups' => [
+        { 'name' => 'docker_nodes', 'targets' => [] },
+        { 'name' => 'lxd_nodes', 'targets' => [] },
+        { 'name' => 'ssh_nodes', 'targets' => [] },
+        { 'name' => 'winrm_nodes', 'targets' => [] },
+      ]
+    }
   end
 end
 

spec/tasks/lxd_spec.rb

@@ -0,0 +1,179 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'webmock/rspec'
+require_relative '../../tasks/lxd'
+require 'yaml'
+
+RSpec::Matchers.define_negated_matcher :not_raise_error, :raise_error
+
+RSpec.shared_context('with tmpdir') do
+  let(:tmpdir) { @tmpdir } # rubocop:disable RSpec/InstanceVariable
+
+  around(:each) do |example|
+    Dir.mktmpdir('rspec-provision_test') do |t|
+      @tmpdir = t
+      example.run
+    end
+  end
+end
+
+describe 'provision::lxd' do
+  let(:lxd) { LXDProvision.new }
+
+  let(:inventory_dir) { "#{tmpdir}/spec/fixtures" }
+  let(:inventory_file) { "#{inventory_dir}/litmus_inventory.yaml" }
+  let(:inventory_hash) { get_inventory_hash(inventory_file) }
+
+  let(:provision_input) do
+    {
+      action: 'provision',
+      platform: 'images:foobar/1',
+      inventory: tmpdir
+    }
+  end
+  let(:tear_down_input) do
+    {
+      action: 'tear_down',
+      node_name: container_id,
+      inventory: tmpdir
+    }
+  end
+
+  let(:lxd_remote) { 'fake' }
+  let(:lxd_flags) { [] }
+  let(:lxd_platform) { nil }
+  let(:container_id) { lxd_init_output }
+  let(:lxd_init_output) { 'random-host' }
+
+  let(:provision_output) do
+    {
+      status: 'ok',
+      node_name: container_id,
+      node: {
+        uri: container_id,
+        config: {
+          transport: 'lxd',
+          lxd: {
+            remote: lxd_remote,
+            'shell-command': 'sh -lc'
+          }
+        },
+        facts: {
+          provisioner: 'lxd',
+          container_id: container_id,
+          platform: lxd_platform
+        }
+      }
+    }
+  end
+
+  let(:tear_down_output) do
+    {
+      status: 'ok',
+      removed: [ container_id ],
+    }
+  end
+
+  include_context('with tmpdir')
+
+  before(:each) do
+    FileUtils.mkdir_p(inventory_dir)
+  end
+
+  describe '.run' do
+    let(:task_input) { {} }
+    let(:imposter) { instance_double('LXDProvision') }
+
+    task_tests = [
+      [ { action: 'provision', platform: 'test' }, 'success', true ],
+      [ { action: 'provision', node_name: 'test' }, 'do not specify node_name', false ],
+      [ { action: 'provision' }, 'platform required', false ],
+      [ { action: 'tear_down', node_name: 'test' }, 'success', true ],
+      [ { action: 'tear_down' }, 'node_name required', false ],
+      [ { action: 'tear_down', platform: 'test' }, 'do not specify platform', false ],
+    ]
+
+    task_tests.each do |v|
+      it "expect arguments '#{v[0]}' return '#{v[1]}'#{v[2] ? '' : ' and raise error'}" do
+        allow(LXDProvision).to receive(:new).and_return(imposter)
+        allow(imposter).to receive(:task).and_return(v[1])
+        allow($stdin).to receive(:read).and_return(v[0].to_json)
+        if v[2]
+          expect { LXDProvision.run }.to output(%r{#{v[1]}}).to_stdout
+        else
+          expect { LXDProvision.run }.to output(%r{#{v[1]}}).to_stdout.and raise_error(SystemExit)
+        end
+      end
+    end
+  end
+
+  describe '.task' do
+    context 'action=provision' do
+      let(:lxd_platform) { provision_input[:platform] }
+
+      before(:each) do
+        expect(lxd).to receive(:run_local_command)
+          .with('lxc -q remote get-default').and_return(lxd_remote)
+        expect(lxd).to receive(:run_local_command)
+          .with("lxc -q init #{lxd_platform} #{lxd_remote}: #{lxd_flags.join(' ')}").and_return(lxd_init_output)
+        expect(lxd).to receive(:run_local_command)
+          .with("lxc -q start #{lxd_remote}:#{container_id}").and_return(lxd_init_output)
+      end
+
+      it 'provisions successfully' do
+        expect(lxd).to receive(:run_local_command)
+          .with("lxc -q exec #{lxd_remote}:#{container_id} uptime")
+
+        LXDProvision.new.add_node_to_group(inventory_hash, JSON.parse(provision_output[:node].to_json), 'lxd_nodes')
+
+        expect(File).to receive(:write).with(inventory_file, JSON.parse(inventory_hash.to_json).to_yaml)
+        expect(lxd.task(**provision_input)).to eq(provision_output)
+      end
+
+      it 'when retries=0 try once but ignore the raised error' do
+        provision_input[:retries] = 0
+
+        expect(lxd).to receive(:run_local_command)
+          .with("lxc -q exec #{lxd_remote}:#{container_id} uptime").and_raise(StandardError)
+
+        expect(lxd.task(**provision_input)).to eq(provision_output)
+      end
+
+      it 'max retries then deletes the instance' do
+        expect(lxd).to receive(:run_local_command)
+          .exactly(3).times
+          .with("lxc -q exec #{lxd_remote}:#{container_id} uptime").and_raise(StandardError)
+        expect(lxd).to receive(:run_local_command)
+          .with("lxc -q delete #{lxd_remote}:#{container_id} -f")
+
+        expect { lxd.task(**provision_input) }.to raise_error(StandardError, %r{Giving up waiting for #{lxd_remote}:#{container_id}})
+      end
+    end
+
+    context 'action=tear_down' do
+      before(:each) do
+        File.write(inventory_file, JSON.parse(inventory_hash.to_json).to_yaml)
+      end
+
+      it 'tears down successfully' do
+        expect(lxd).to receive(:run_local_command)
+          .with("lxc -q delete #{lxd_remote}:#{container_id} -f")
+
+        LXDProvision.new.add_node_to_group(inventory_hash, JSON.parse(provision_output[:node].to_json), 'lxd_nodes')
+        File.write(inventory_file, inventory_hash.to_yaml)
+
+        expect(lxd.task(**tear_down_input)).to eq(tear_down_output)
+      end
+
+      it 'expect to raise error if no inventory' do
+        File.delete(inventory_file)
+        expect { lxd.task(**tear_down_input) }.to raise_error(StandardError, %r{Unable to find})
+      end
+
+      it 'expect to raise error if node_name not in inventory' do
+        expect { lxd.task(**tear_down_input) }.to raise_error(StandardError, %r{node_name #{container_id} not found in inventory})
+      end
+    end
+  end
+end

tasks/lxd.json

@@ -0,0 +1,56 @@
+{
+  "puppet_task_version": 1,
+  "supports_noop": false,
+  "description": "Provision/Tear down an instance on LXD",
+  "parameters": {
+    "action": {
+      "description": "Action to perform, tear_down or provision",
+      "type": "Enum[provision, tear_down]",
+      "default": "provision"
+    },
+    "inventory": {
+      "description": "Location of the inventory file",
+      "type": "Optional[String[1]]"
+    },
+    "node_name": {
+      "description": "The name of the instance",
+      "type": "Optional[String[1]]"
+    },
+    "platform": {
+      "description": "LXD image to use, eg images:ubuntu/22.04",
+      "type": "Optional[String[1]]"
+    },
+    "profiles": {
+      "description": "LXD Profiles to apply",
+      "type": "Optional[Array[String[1]]]"
+    },
+    "storage": {
+      "description": "LXD Storage pool name",
+      "type": "Optional[String[1]]"
+    },
+    "instance_type": {
+      "description": "LXD Instance type",
+      "type": "Optional[String[1]]"
+    },
+    "vm": {
+      "description": "Provision as a virtual-machine instead of a container",
+      "type": "Optional[Boolean]"
+    },
+    "remote": {
+      "description": "LXD remote, defaults to the LXD client configured default remote",
+      "type": "Optional[String]"
+    },
+    "retries": {
+      "description": "On provision check the instance is accepting commands, will be deleted if retries exceeded, 0 to disable",
+      "type": "Integer",
+      "default": 5
+    },
+    "vars": {
+      "description": "YAML string of key/value pairs to add to the inventory vars section",
+      "type": "Optional[String[1]]"
+    }
+  },
+  "files": [
+    "provision/lib/task_helper.rb"
+  ]
+}