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| 1 | +# frozen_string_literal: true |
| 2 | + |
| 3 | +module Facter |
| 4 | + module Resolvers |
| 5 | + module Linux |
| 6 | + class Containers < BaseResolver |
| 7 | + # :virtual |
| 8 | + # :hypervisor |
| 9 | + |
| 10 | + init_resolver |
| 11 | + |
| 12 | + INFO = { 'docker' => 'id', 'lxc' => 'name' }.freeze |
| 13 | + |
| 14 | + class << self |
| 15 | + private |
| 16 | + |
| 17 | + def post_resolve(fact_name, _options) |
| 18 | + @fact_list.fetch(fact_name) do |
| 19 | + read_environ(fact_name) || read_cgroup(fact_name) |
| 20 | + end |
| 21 | + end |
| 22 | + |
| 23 | + def read_cgroup(fact_name) |
| 24 | + output_cgroup = Facter::Util::FileHelper.safe_read('/proc/1/cgroup', nil) |
| 25 | + return unless output_cgroup |
| 26 | + |
| 27 | + output_docker = %r{docker/(.+)}.match(output_cgroup) |
| 28 | + output_lxc = %r{^/lxc/([^/]+)}.match(output_cgroup) |
| 29 | + |
| 30 | + info, vm = extract_vm_and_info(output_docker, output_lxc) |
| 31 | + @fact_list[:vm] = vm |
| 32 | + @fact_list[:hypervisor] = { vm.to_sym => info } if vm |
| 33 | + @fact_list[fact_name] |
| 34 | + end |
| 35 | + |
| 36 | + def read_environ(fact_name) |
| 37 | + begin |
| 38 | + container = Facter::Util::Linux::Proc.getenv_for_pid(1, 'container') |
| 39 | + rescue StandardError => e |
| 40 | + log.warn("Unable to getenv for pid 1, '#{e}'") |
| 41 | + return nil |
| 42 | + end |
| 43 | + return if container.nil? || container.empty? |
| 44 | + |
| 45 | + info = {} |
| 46 | + case container |
| 47 | + when 'lxc' |
| 48 | + vm = 'lxc' |
| 49 | + when 'podman' |
| 50 | + vm = 'podman' |
| 51 | + when 'crio' |
| 52 | + vm = 'crio' |
| 53 | + when 'systemd-nspawn' |
| 54 | + vm = 'systemd_nspawn' |
| 55 | + info = { 'id' => Facter::Util::FileHelper.safe_read('/etc/machine-id', nil).strip } |
| 56 | + else |
| 57 | + vm = 'container_other' |
| 58 | + log.warn("Container runtime, '#{container}', is unsupported, setting to '#{vm}'") |
| 59 | + end |
| 60 | + @fact_list[:vm] = vm |
| 61 | + @fact_list[:hypervisor] = { vm.to_sym => info } if vm |
| 62 | + @fact_list[fact_name] |
| 63 | + end |
| 64 | + |
| 65 | + def extract_vm_and_info(output_docker, output_lxc) |
| 66 | + vm = nil |
| 67 | + if output_docker |
| 68 | + vm = 'docker' |
| 69 | + info = output_docker[1] |
| 70 | + elsif output_lxc |
| 71 | + vm = 'lxc' |
| 72 | + info = output_lxc[1] |
| 73 | + end |
| 74 | + |
| 75 | + [info ? { INFO[vm] => info } : {}, vm] |
| 76 | + end |
| 77 | + end |
| 78 | + end |
| 79 | + end |
| 80 | + end |
| 81 | +end |
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