batch Resource

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To suggest a change, edit the batch.rb file and submit a pull request to the Chef Infra Client repository.

Chef Infra Client resources reference page

Warning

Progress Chef is currently reviewing the Chef Infra Client 19 resource documentation for accuracy and updating it. Please test your cookbooks accordingly.

Use the batch resource to execute a batch script using the cmd.exe interpreter on Windows. The batch resource creates and executes a temporary file (similar to how the script resource behaves), rather than running the command inline. Commands that are executed with this resource are (by their nature) not idempotent, as they are typically unique to the environment in which they are run. Use not_if and only_if to guard this resource for idempotence.

Syntax

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

  cgroup   code   command   creates   cwd   default_env   domain   elevated   environment   flags   group   input   interpreter   live_stream   login   password   returns   timeout   user   action batch 'name' do String String String, Array # default value: 'name' unless specified String String true, false # default value: false String true, false # default value: false Hash String String, Integer String String true, false # default value: false true, false # default value: false String Integer, Array # default value: 0 Integer, String, Float # default value: 3600 String, Integer Symbol # defaults to :run if not specified style=color:#007020;font-weight:700>end

where:

batch 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.
cgroup, code, command, creates, cwd, default_env, domain, elevated, environment, flags, group, input, interpreter, live_stream, login, password, returns, timeout, and user are the properties available to this resource.

Actions

The batch resource has the following actions:

:nothing: This resource block doesn’t 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.
:run: Run a command. (default)

Properties

The batch resource has the following properties:

cgroup

Ruby Type: String

Linux only: Run the command within a specific cgroup, creating it if it doesn’t exist.

New in Chef Infra Client 19.0

code

Ruby Type: String | REQUIRED

A quoted string of code to be executed.

command

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

An optional property to set the command to be executed if it differs from the resource block’s name.

Note

Use the execute resource to run a single command. Use multiple execute resource blocks to run multiple commands.

creates

Ruby Type: String

Prevent a command from creating a file when that file already exists.

cwd

Ruby Type: String

The current working directory from which the command will be run.

default_env

Ruby Type: true, false | Default Value: false

When true this enables ENV magic to add path_sanity to the PATH and force the locale to English+UTF-8 for parsing output

New in Chef Client 14.2

domain

Ruby Type: String

Windows only: The domain of the user specified by the user property. If not specified, the username and password specified by the user and password properties will be used to resolve that user against the domain in which the system running Chef Infra Client is joined, or if that system is not joined to a domain it will resolve the user as a local account on that system. An alternative way to specify the domain is to leave this property unspecified and specify the domain as part of the user property.

New in Chef Client 12.21

elevated

Ruby Type: true, false | Default Value: false

Determines whether the script will run with elevated permissions to circumvent User Access Control (UAC) from interactively blocking the process. This will cause the process to be run under a batch login instead of an interactive login. The user running chef-client needs the ‘Replace a process level token’ and ‘Adjust Memory Quotas for a process’ permissions. The user that is running the command needs the ‘Log on as a batch job’ permission. Because this requires a login, the user and password properties are required.

New in Chef Client 13.3

environment

Ruby Type: Hash

A Hash of environment variables in the form of ({'ENV_VARIABLE' => 'VALUE'}). Note: These variables must exist for a command to be run successfully.

flags

Ruby Type: String

One or more command line flags that are passed to the interpreter when a command is invoked.

group

Ruby Type: String, Integer

The group name or group ID that must be changed before running a command.

input

Ruby Type: String

An optional property to set the input sent to the command as STDIN.

New in Chef Infra Client 16.2

interpreter

Ruby Type: String

live_stream

Ruby Type: true, false | Default Value: false

Send the output of the command run by this execute resource block to the Chef Infra Client event stream.

login

Ruby Type: true, false | Default Value: false

Use a login shell to run the commands instead of inheriting the existing execution environment.

New in Chef Infra Client 17.0

password

Ruby Type: String

Windows only: The password of the user specified by the user property. This property is mandatory if user is specified on Windows and may only be specified if user is specified. The sensitive property for this resource will automatically be set to true if password is specified.

New in Chef Client 12.21

returns

Ruby Type: Integer, Array | Default Value: 0

The return value for a command. This may be an array of accepted values. An exception is raised when the return value(s) do not match.

timeout

Ruby Type: Integer, String, Float | Default Value: 3600

The amount of time (in seconds) a command is to wait before timing out.

user

Ruby Type: String, Integer

The user name of the user identity with which to launch the new process. The user name may optionally be specified with a domain, i.e. domainuser or user@subdomain.dns.example.com via Universal Principal Name (UPN)format. It can also be specified without a domain simply as user if the domain is instead specified using the domain attribute. On Windows only, if this property is specified, the password property must be specified.

password

Ruby Type: String

Windows only: The password of the user specified by the user property. This property is mandatory if user is specified on Windows and may only be specified if user is specified. The sensitive property for this resource will automatically be set to true if password is specified.

domain

Ruby Type: String

Windows only: The domain of the user specified by the user property. If not specified, the user name and password specified by the user and password properties will be used to resolve that user against the domain in which the system running Chef Infra Client is joined, or if that system is not joined to a domain it will resolve the user as a local account on that system. An alternative way to specify the domain is to leave this property unspecified and specify the domain as part of the user property.

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 won’t 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 isn’t 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 doesn’t exist, an error is raised. In contrast, subscribes won’t fail if the source resource isn’t 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, for each 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 doesn’t 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 doesn’t 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 doesn’t exist, the subscription won’t raise an error. Contrast this with the stricter semantics of notifies, which will raise an error if the other resource doesn’t 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, for each 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 isn’t 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 isn’t 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’s 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’s 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 batch resource in recipes:

Unzip a file, and then move it

To run a batch file that unzips and then moves Ruby, do something like:

batch 'unzip_and_move_ruby' do
  code <<-EOH
    7z.exe x #{Chef::Config[:file_cache_path]}/ruby-1.8.7-p352-i386-mingw32.7z
      -oC:\\source -r -y
    xcopy C:\\source\\ruby-1.8.7-p352-i386-mingw32 C:\\ruby /e /y
  EOH
end

batch 'echo some env vars' do
  code <<-EOH
    echo %TEMP%
    echo %SYSTEMDRIVE%
    echo %PATH%
    echo %WINDIR%
  EOH
end

or:

batch 'unzip_and_move_ruby' do
  code <<-EOH
    7z.exe x #{Chef::Config[:file_cache_path]}/ruby-1.8.7-p352-i386-mingw32.7z
      -oC:\\source -r -y
    xcopy C:\\source\\ruby-1.8.7-p352-i386-mingw32 C:\\ruby /e /y
  EOH
end

batch 'echo some env vars' do
  code 'echo %TEMP%\\necho %SYSTEMDRIVE%\\necho %PATH%\\necho %WINDIR%'
end

Run a command as an alternate user

Note: When Chef is running as a service, this feature requires that the user that Chef runs as has ‘SeAssignPrimaryTokenPrivilege’ (aka ‘SE_ASSIGNPRIMARYTOKEN_NAME’) user right. By default only LocalSystem and NetworkService have this right when running as a service. This is necessary even if the user is an Administrator.

This right can be added and checked in a recipe using this example:

# Add 'SeAssignPrimaryTokenPrivilege' for the user
Chef::ReservedNames::Win32::Security.add_account_right('<user>', 'SeAssignPrimaryTokenPrivilege')

# Check if the user has 'SeAssignPrimaryTokenPrivilege' rights
Chef::ReservedNames::Win32::Security.get_account_right('<user>').include?('SeAssignPrimaryTokenPrivilege')

The following example shows how to run mkdir test_dir from a Chef Infra Client run as an alternate user.

# Passing only username and password
batch 'mkdir test_dir' do
 code "mkdir test_dir"
 cwd Chef::Config[:file_cache_path]
 user "username"
 password "password"
end

# Passing username and domain
batch 'mkdir test_dir' do
 code "mkdir test_dir"
 cwd Chef::Config[:file_cache_path]
 domain "domain"
 user "username"
 password "password"
end

# Passing username = 'domain-name\\username'. No domain is passed
batch 'mkdir test_dir' do
 code "mkdir test_dir"
 cwd Chef::Config[:file_cache_path]
 user "domain-name\\username"
 password "password"
end

# Passing username = 'username@domain-name'. No domain is passed
batch 'mkdir test_dir' do
 code "mkdir test_dir"
 cwd Chef::Config[:file_cache_path]
 user "username@domain-name"
 password "password"
end