file_key_value_parameter_absent_in_list

Ensure that a parameter doesn't exist in a list of parameters, on one single line, in the right hand side of a key->values line.

⚙️ Compatible targets: Linux

Parameters

Name	Documentation
path	File name to edit (absolute path on the target node). This parameter is required.
key	Full key name. This parameter is required.
key_value_separator	character used to separate key and value in a key-value line. This parameter can contain only whitespaces. This parameter is required.
parameter_regex	Regular expression matching the sub-value to ensure is not present in the list of parameters that form the value part of that line. This parameter is required.
parameter_separator	Character used to separate parameters in the list. This parameter can contain only whitespaces. This parameter is required.
leading_char_separator	leading character of the parameters. This parameter is optional.
closing_char_separator	closing character of the parameters. This parameter is optional.

Outcome conditions

You need to replace ${path} with its actual canonified value.

✅ Ok: file_key_value_parameter_absent_in_list_${path}_ok
- ☑️ Already compliant: file_key_value_parameter_absent_in_list_${path}_kept
- 🟨 Repaired: file_key_value_parameter_absent_in_list_${path}_repaired
❌ Error: file_key_value_parameter_absent_in_list_${path}_error

Example

method: file_key_value_parameter_absent_in_list
params:
  key: VALUE
  closing_char_separator: OPTIONAL_VALUE
  key_value_separator: VALUE
  path: VALUE
  parameter_regex: VALUE
  parameter_separator: VALUE
  leading_char_separator: OPTIONAL_VALUE

Edit the file, and ensure it does not contain the defined parameter in the list of values on the right hand side of a key->values line. If the parameter is there, it will be removed. Please note that the parameter can be a regular expression. It will also remove any whitespace character between the parameter and parameter_separator Optionally, you can define leading and closing character to enclose the parameters

Example

If you have an initial file (/etc/default/grub) containing

GRUB_CMDLINE_XEN="dom0_mem=16G dom0_max_vcpus=32"

To remove parameter dom0_max_vcpus=32 in the right hand side of the line, you'll need the following policy

file_ensure_key_value_parameter_not_in_list("/etc/default/grub", "GRUB_CMDLINE", "=", "dom0_max_vcpus=32", " ", "\"", "\"");

Rudder techniques