dmg_package resource

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Use the dmg_package resource to install a package from a .dmg file. The resource will retrieve the file from a remote URL, mount it using OS X’s hdidutil, copy the application to the specified destination (/Applications), and detach the image using hdiutil. The .dmg file will be stored in the Chef::Config[:file_cache_path].

New in Chef Client 14.0.

Syntax

The dmg_package resource has the following syntax:

dmg_package 'name' do
  accept_eula          true, false # default value: false
  allow_untrusted      true, false # default value: false
  app                  String # default value: 'name' unless specified
  checksum             String
  destination          String # default value: "/Applications"
  dmg_name             String # default value: The value passed for the application name.
  dmg_passphrase       String
  file                 String
  headers              Hash
  owner                String
  package_id           String
  source               String
  type                 String # default value: "app"
  volumes_dir          String # default value: The value passed for the application name.
  action               Symbol # defaults to :install if not specified
end

where:

  • dmg_package is the resource.
  • name is the name given to the resource block.
  • action identifies which steps the chef-client will take to bring the node into the desired state.
  • accept_eula, allow_untrusted, app, checksum, destination, dmg_name, dmg_passphrase, file, headers, owner, package_id, source, type, and volumes_dir are the properties available to this resource.

Actions

The dmg_package resource has the following actions:

:install
Default. Installs the application.
: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 the Chef Client run.

Properties

The dmg_package resource has the following properties:

accept_eula

Ruby Type: true, false | Default Value: false

Specify whether to accept the EULA. Certain dmgs require acceptance of EULA before mounting.

allow_untrusted

Ruby Type: true, false | Default Value: false

Allow installation of packages that do not have trusted certificates.

app

Ruby Type: String | Default Value: The resource block's name

The name of the application as it appears in the /Volumes directory, if it differs from the resource block name.

checksum

Ruby Type: String

The sha256 checksum of the .dmg file to download.

destination

Ruby Type: String | Default Value: "/Applications"

The directory to copy the .app into.

dmg_name

Ruby Type: String | Default Value: The value passed for the application name.

The name of the .dmg file if it differs from that of the app, or if the name has spaces.

dmg_passphrase

Ruby Type: String

Specify a passphrase to be used to decrypt the .dmg file during the mount process.

file

Ruby Type: String

The full path to the .dmg file on the local system.

headers

Ruby Type: Hash

Allows custom HTTP headers (like cookies) to be set on the remote_file resource.

owner

Ruby Type: String

The user that should own the package installation.

package_id

Ruby Type: String

The package ID that is registered with pkgutil when a pkg or mpkg is installed.

source

Ruby Type: String

The remote URL that is used to download the .dmg file, if specified.

type

Ruby Type: String | Default Value: "app"

The type of package.

volumes_dir

Ruby Type: String | Default Value: The value passed for the application name.

The directory under /Volumes where the dmg is mounted, if it differs from the name of the .dmg file.

Common Resource Functionality

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

Common Properties

The following properties are common to every resource:

ignore_failure

Ruby Type: true, false | Default Value: false

Continue running a recipe if a resource fails for any reason.

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 retry delay (in seconds).

sensitive

Ruby Type: true, false | Default Value: false

Ensure that sensitive resource data is not logged by the chef-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.

A timer specifies the point during the Chef 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 the Chef 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.

A timer specifies the point during the Chef 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 the Chef 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 the chef-client run. Based on the results of this evaluation, a guard property is then used to tell the chef-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 the chef-client to do nothing.

The following properties can be used to define a guard that is evaluated during the execution phase of the chef-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.