Launchd Resource

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Use the launchd resource to manage system-wide services (daemons) and per-user services (agents) on the macOS platform.

New in Chef Infra Client 12.8.

Syntax

The full syntax for all of the properties that are available to the launchd resource is:

launchd 'name' do
  abandon_process_group           true, false
  backup                          Integer, false
  cookbook                        String
  debug                           true, false
  disabled                        true, false # default value: false
  enable_globbing                 true, false
  enable_transactions             true, false
  environment_variables           Hash
  exit_timeout                    Integer
  group                           String, Integer
  hard_resource_limits            Hash
  inetd_compatibility             Hash
  init_groups                     true, false
  keep_alive                      true, false, Hash
  label                           String # default value: 'name' unless specified
  launch_events                   Hash
  launch_only_once                true, false
  ld_group                        String
  limit_load_from_hosts           Array
  limit_load_to_hosts             Array
  limit_load_to_session_type      Array, String
  low_priority_io                 true, false
  mach_services                   Hash
  mode                            String, Integer
  nice                            Integer
  on_demand                       true, false
  owner                           String, Integer
  path                            String
  plist_hash                      Hash
  process_type                    String
  program                         String
  program_arguments               Array
  queue_directories               Array
  root_directory                  String
  run_at_load                     true, false
  session_type                    String
  sockets                         Hash
  soft_resource_limits            Array
  source                          String
  standard_error_path             String
  standard_in_path                String
  standard_out_path               String
  start_calendar_interval         Hash, Array
  start_interval                  Integer
  start_on_mount                  true, false
  throttle_interval               Integer
  time_out                        Integer
  type                            String # default value: "daemon"
  username                        String
  wait_for_debugger               true, false
  watch_paths                     Array
  working_directory               String
  action                          Symbol # defaults to :create if not specified
end

where:

launchd is the resource.
name is the name given to the resource block.
action identifies which steps Chef Infra Client will take to bring the node into the desired state.
abandon_process_group, backup, cookbook, debug, disabled, enable_globbing, enable_transactions, environment_variables, exit_timeout, group, hard_resource_limits, inetd_compatibility, init_groups, keep_alive, label, launch_events, launch_only_once, ld_group, limit_load_from_hosts, limit_load_to_hosts, limit_load_to_session_type, low_priority_io, mach_services, mode, nice, on_demand, owner, path, plist_hash, process_type, program, program_arguments, queue_directories, root_directory, run_at_load, session_type, sockets, soft_resource_limits, source, standard_error_path, standard_in_path, standard_out_path, start_calendar_interval, start_interval, start_on_mount, throttle_interval, time_out, type, username, wait_for_debugger, watch_paths, and working_directory are the properties available to this resource.

Actions

The launchd resource has the following actions:

:create: Create a launchd property list. (default)
:create_if_missing: Create a launchd property list, if it does not already exist.
:delete: Delete a launchd property list. This will unload a daemon or agent, if loaded.
:disable: Disable a launchd property list.
:enable: Create a launchd property list, and then ensure that it is enabled. If a launchd property list already exists, but does not match, updates the property list to match, and then restarts the daemon or agent.
:nothing: This resource block does not act unless notified by another resource to take action. Once notified, this resource block either runs immediately or is queued up to run at the end of a Chef Infra Client run.
:restart: Restart a launchd managed daemon or agent.

Properties

The launchd resource has the following properties:

abandon_process_group: Ruby Type: true, false
If a job dies, all remaining processes with the same process ID may be kept running. Set to true to kill all remaining processes.

backup: Ruby Type: Integer, false
The number of backups to be kept in /var/chef/backup. Set to false to prevent backups from being kept.

cookbook: Ruby Type: String
The name of the cookbook in which the source files are located.

group: Ruby Type: String, Integer
When launchd is run as the root user, the group to run the job as. If the username property is specified and this property is not, this value is set to the default group for the user.

label: Ruby Type: String
The unique identifier for the job.

mode: Ruby Type: Integer, String | Default Value: '0755'
A quoted 3-5 character string that defines the octal mode. For example: '755', '0755', or 00755.

owner: Ruby Type: Integer, String
A string or ID that identifies the group owner by user name, including fully qualified user names such as domain\user or user@domain. If this value is not specified, existing owners remain unchanged and new owner assignments use the current user (when necessary).

path: Ruby Type: String
The path to the directory. Using a fully qualified path is recommended, but is not always required. Default value: the name of the resource block. See “Syntax” section above for more information.

plist_hash: Ruby Type: Hash
A Hash of key value pairs used to create the launchd property list.

session_type: Ruby Type: String
The type of launchd plist to be created. Possible values: system (default) or user.

source: Ruby Type: String
The path to the launchd property list.

type: Ruby Type: String
The type of resource. Possible values: daemon (default), agent.

abandon_process_group: Ruby Type: true, false
If a job dies, all remaining processes with the same process ID may be kept running. Set to true to kill all remaining processes.

debug: Ruby Type: true, false
Sets the log mask to LOG_DEBUG for this job.

disabled: Ruby Type: true, false | Default Value: false
Hints to launchctl to not submit this job to launchd.

enable_globbing: Ruby Type: true, false
Update program arguments before invocation.

enable_transactions: Ruby Type: true, false
Track in-progress transactions; if none, then send the SIGKILL signal.

environment_variables: Ruby Type: Hash
Additional environment variables to set before running a job.

exit_timeout: Ruby Type: Integer
The amount of time (in seconds) launchd waits before sending a SIGKILL signal.

hard_resource_limits: Ruby Type: Hash
A Hash of resource limits to be imposed on a job.

inetd_compatibility: Ruby Type: Hash
Specifies if a daemon expects to be run as if it were launched from inetd. Set to wait => true to pass standard input, output, and error file descriptors. Set to wait => false to call the accept system call on behalf of the job, and then pass standard input, output, and error file descriptors.

init_groups: Ruby Type: true, false
Specify if initgroups is called before running a job.

keep_alive

Ruby Type: true, false, Hash

Keep a job running continuously (true) or allow demand and conditions on the node to determine if the job keeps running (false).

New in Chef Client 12.14

launch_events

Ruby Type: Hash

Specify higher-level event types to be used as launch-on-demand event sources.

New in Chef Infra Client 15.1

launch_only_once: Ruby Type: true, false
Specify if a job can be run only one time. Set this value to true if a job cannot be restarted without a full machine reboot.

limit_load_from_hosts: Ruby Type: Array
An array of hosts to which this configuration file does not apply, i.e. ‘apply this configuration file to all hosts not specified in this array’.

limit_load_to_hosts: Ruby Type: Array
An array of hosts to which this configuration file applies.

limit_load_to_session_type: Ruby Type: Array, String
The session type(s) to which this configuration file applies.

low_priority_io: Ruby Type: true, false
Specify if the kernel on the node should consider this daemon to be low priority during file system I/O.

mach_services: Ruby Type: Hash
Specify services to be registered with the bootstrap subsystem.

nice: Ruby Type: Integer
The program scheduling priority value in the range -20 to 19.

on_demand: Ruby Type: true, false
Keep a job alive. Only applies to macOS version 10.4 (and earlier); use keep_alive instead for newer versions.

process_type: Ruby Type: String
The intended purpose of the job: Adaptive, Background, Interactive, or Standard.

program: Ruby Type: String
The first argument of execvp, typically the file name associated with the file to be executed. This value must be specified if program_arguments is not specified, and vice-versa.

program_arguments: Ruby Type: Array
The second argument of execvp. If program is not specified, this property must be specified and will be handled as if it were the first argument.

queue_directories: Ruby Type: Array
An array of non-empty directories which, if any are modified, will cause a job to be started.

root_directory: Ruby Type: String
chroot to this directory, and then run the job.

run_at_load: Ruby Type: true, false
Launch a job once (at the time it is loaded).

sockets: Ruby Type: Hash
A Hash of on-demand sockets that notify launchd when a job should be run.

soft_resource_limits: Ruby Type: Array
A Hash of resource limits to be imposed on a job.

standard_error_path: Ruby Type: String
The file to which standard error (stderr) is sent.

standard_in_path: Ruby Type: String
The file to which standard input (stdin) is sent.

standard_out_path: Ruby Type: String
The file to which standard output (stdout) is sent.

start_calendar_interval: Ruby Type: Hash
A Hash (similar to crontab) that defines the calendar frequency at which a job is started. For example: { Minute => "0", Hour => "20", Day => "*", Weekday => "1-5", Month => "*" } will run a job at 8:00 PM every day, Monday through Friday, every month of the year.

start_interval: Ruby Type: Integer
The frequency (in seconds) at which a job is started.

start_on_mount: Ruby Type: true, false
Start a job every time a file system is mounted.

throttle_interval: Ruby Type: Integer | Default Value: 10
The frequency (in seconds) at which jobs are allowed to spawn.

time_out: Ruby Type: Integer
The amount of time (in seconds) a job may be idle before it times out. If no value is specified, the default timeout value for launchd will be used.

username: Ruby Type: String
When launchd is run as the root user, the user to run the job as.

wait_for_debugger: Ruby Type: true, false
Specify if launchd has a job wait for a debugger to attach before executing code.

watch_paths: Ruby Type: Array
An array of paths which, if any are modified, will cause a job to be started.

working_directory: Ruby Type: String
chdir to this directory, and then run the job.

Common Resource Functionality

Chef resources include common properties, notifications, and resource guards.

Common Properties

The following properties are common to every resource:

compile_time

Ruby Type: true, false | Default Value: false

Control the phase during which the resource is run on the node. Set to true to run while the resource collection is being built (the compile phase). Set to false to run while Chef Infra Client is configuring the node (the converge phase).

ignore_failure

Ruby Type: true, false, :quiet | Default Value: false

Continue running a recipe if a resource fails for any reason. :quiet will not display the full stack trace and the recipe will continue to run if a resource fails.

retries

Ruby Type: Integer | Default Value: 0

The number of attempts to catch exceptions and retry the resource.

retry_delay

Ruby Type: Integer | Default Value: 2

The delay in seconds between retry attempts.

sensitive

Ruby Type: true, false | Default Value: false

Ensure that sensitive resource data is not logged by Chef Infra Client.

Notifications

notifies

Ruby Type: Symbol, 'Chef::Resource[String]'

A resource may notify another resource to take action when its state changes. Specify a 'resource[name]', the :action that resource should take, and then the :timer for that action. A resource may notify more than one resource; use a notifies statement for each resource to be notified.

If the referenced resource does not exist, an error is raised. In contrast, subscribes will not fail if the source resource is not found.

A timer specifies the point during a Chef Infra Client run at which a notification is run. The following timers are available:

:before: Specifies that the action on a notified resource should be run before processing the resource block in which the notification is located.
:delayed: Default. Specifies that a notification should be queued up, and then executed at the end of a Chef Infra Client run.
:immediate, :immediately: Specifies that a notification should be run immediately, per resource notified.

The syntax for notifies is:

notifies :action, 'resource[name]', :timer

subscribes: Ruby Type: Symbol, 'Chef::Resource[String]'

A resource may listen to another resource, and then take action if the state of the resource being listened to changes. Specify a 'resource[name]', the :action to be taken, and then the :timer for that action.

Note that subscribes does not apply the specified action to the resource that it listens to - for example:

file '/etc/nginx/ssl/example.crt' do
  mode '0600'
  owner 'root'
end

service 'nginx' do
  subscribes :reload, 'file[/etc/nginx/ssl/example.crt]', :immediately
end

In this case the subscribes property reloads the nginx service whenever its certificate file, located under /etc/nginx/ssl/example.crt, is updated. subscribes does not make any changes to the certificate file itself, it merely listens for a change to the file, and executes the :reload action for its resource (in this example nginx) when a change is detected.

If the other resource does not exist, the subscription will not raise an error. Contrast this with the stricter semantics of notifies, which will raise an error if the other resource does not exist.

A timer specifies the point during a Chef Infra Client run at which a notification is run. The following timers are available:

:before: Specifies that the action on a notified resource should be run before processing the resource block in which the notification is located.
:delayed: Default. Specifies that a notification should be queued up, and then executed at the end of a Chef Infra Client run.
:immediate, :immediately: Specifies that a notification should be run immediately, per resource notified.

The syntax for subscribes is:

subscribes :action, 'resource[name]', :timer

Guards

A guard property can be used to evaluate the state of a node during the execution phase of a Chef Infra Client run. Based on the results of this evaluation, a guard property is then used to tell Chef Infra Client if it should continue executing a resource. A guard property accepts either a string value or a Ruby block value:

A string is executed as a shell command. If the command returns 0, the guard is applied. If the command returns any other value, then the guard property is not applied. String guards in a powershell_script run Windows PowerShell commands and may return true in addition to 0.
A block is executed as Ruby code that must return either true or false. If the block returns true, the guard property is applied. If the block returns false, the guard property is not applied.

A guard property is useful for ensuring that a resource is idempotent by allowing that resource to test for the desired state as it is being executed, and then if the desired state is present, for Chef Infra Client to do nothing.

Properties

The following properties can be used to define a guard that is evaluated during the execution phase of a Chef Infra Client run:

not_if: Prevent a resource from executing when the condition returns true.
only_if: Allow a resource to execute only if the condition returns true.

Examples

The following examples demonstrate various approaches for using the launchd resource in recipes:

Create a Launch Daemon from a cookbook file

launchd 'com.chef.every15' do
  source 'com.chef.every15.plist'
end

Create a Launch Daemon using keys

launchd 'call.mom.weekly' do
  program '/Library/scripts/call_mom.sh'
  start_calendar_interval 'Weekday' => 7, 'Hourly' => 10
  time_out 300
end

Remove a Launch Daemon

launchd 'com.chef.every15' do
  action :delete
end

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