archive_file resource¶

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Use the archive_file resource to extract archive files to disk. This resource uses the libarchive library to extract multiple archive formats including tar, gzip, bzip, and zip formats.

New in Chef Infra Client 15.0.

Syntax¶

The archive_file resource has the following syntax:

archive_file 'name' do
  destination      String
  group            String
  mode             String, Integer # default value: "755"
  options          Array, Symbol
  overwrite        true, false, auto # default value: false
  owner            String
  path             String # default value: 'name' unless specified
  action           Symbol # defaults to :extract if not specified
end

where:

archive_file 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.
destination, group, mode, options, overwrite, owner, and path are the properties available to this resource.

Actions¶

The archive_file resource has the following actions:

:extract: Extract and archive file.
: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.

Properties¶

The archive_file resource has the following properties:

destination

Ruby Type: String | REQUIRED

The file path to extract the archive file to.

group

Ruby Type: String

The group of the extracted files.

mode

Ruby Type: String, Integer | Default Value: "755"

The mode of the extracted files.

options

Ruby Type: Array, Symbol

An array of symbols representing extraction flags. Example: :no_overwrite to prevent overwriting files on disk. By default, this properly sets :time, which preserves the modification timestamps of files in the archive when writing them to disk.

overwrite

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

Should the resource overwrite the destination file contents if they already exist? If set to :auto, the date stamp of files within the archive will be compared to those on disk, and disk contents will be overwritten if they differ. This may cause unintended consequences if disk date stamps are changed between runs, which will result in the files being overwritten during each client run. Make sure to properly test any change to this property.

owner

Ruby Type: String

The owner of the extracted files.

path

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

An optional property to set the file path to the archive to extract if it differs from the resource block’s name.

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 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.

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.

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 resources in recipes:

Extract a zip file to a specified directory

archive_file 'Precompiled.zip' do
  path '/tmp/Precompiled.zip'
  destination '/srv/files'
end