Ansible Module xml

External

• https://docs.ansible.com/ansible/latest/collections/community/general/xml_module.html

Internal

• Ansible Concepts

Overview

The plugin is named community.general.xml and it offers functionality aimed at interacting with XML files, using XPath.

Example

<box>
    <object name="A" color="red">square</child>
    <object name="B" color="green">circle</child>
    <object name="C" color="blue">triangle</child>
</box>

- name: XML manipulation
  xml:
    path: /tmp/test.xml # the file must exist
    xpath: /box/object[@name='B']

Module Parameters

path (dest, file)

The path to the file to operate on. The file must exists, otherwise the module will fail, with a message similar to: The target XML source '...' does not exist.. The parameter is required unless xmlstring is provided.

- name: test
  xml:
    path: /tmp/test.xml # the file must exist
    ...

xpath

A valid XPath expression describing the file item(s) to manipulate. Operates on the document root, /, by default.

- name: test
  xml:
    ...
    xpath: /box/object[@name='B']
    ...

content

Specifies the kind of content we want to get from the matching XPath expression:

• attribute or
• text.

xpath must be set.

attribute

The matches result key contains a JSON document listing the matching elements and the value of all their attributes. The count result key contains the number of matching elements.

- name: test
  xml:
    path: test.xml
    xpath: /box/object[@name='B']
    content: attribute
  register: xpath_result

produces the following xpath_result.matches:

[
  {
    "object": {
      "color": "green",
       "name": "B"
    }
  }
]

text

The matches result key contains a JSON document listing the matching elements name and its element text. The count result key contains the number of matching elements.

- name: test
  xml:
    path: test.xml
    xpath: /box/object[@name='B']
    content: text
  register: xpath_result

produces the following xpath_result.matches:

[
  {
    "object": "circle"
  }
]

value

Configuration element useful when updating or deleting XML content. value represents the desired state of the selected attribute. It could be either a string, or to unset a value, the Python None keyword (YAML Equivalent, null).

Elements default to no value (but present). Attributes default to an empty string.

attribute

The attribute to select when using parameter value. This is a string, not prepended with @.

xmlstring

A string containing in-line XML content on which to operate. This parameter is required, unless path is given.

pretty_print

A boolean value ("yes", "no") that tells whether to pretty print the content of the generated files. By default, pretty printing is turned off.

backup

Boolean (yes, no). Create a backup file including timestamp information so the original file can be recovered in case the transformation is wrong.

Children Manipulation

Children can be added with add_children or updated with set_children:

add_children

Add additional child element(s) to the element that matched xpath. The elements to be added must be given in a list. Each item may be either a string (example: children=ansible to add an empty <ansible/> child or a hash where the key is an element name and the value is the element value. xpath must be set if add_children is used.

- name: test
  xml:
    file: test.xml
    xpath: /box
    pretty_print: true
    add_children:
      - object: rectangle
      - object: ellipse

This will modify the file and add the following content:

<box>
...
<object>rectangle</object><object>ellipse</object></box>

The output is not "pretty printed", to pretty print, use pretty_print: yes

Use Cases

Deletion

- name: Bump Java build heap size to {{build.jvm.heap_max}} MB
  xml:
    path: "{{ansible_env.PROJECT_ROOT}}/.idea/compiler.xml"
    xpath: /project/component[@name='CompilerConfiguration']/option[@name='BUILD_PROCESS_HEAP_SIZE']
    attribute: "value"
    value: "{{build.jvm.heap_max}}"

- name: Set Eclipse as default compiler
  xml:
    path: "{{idea_path}}/.idea/compiler.xml"
    xpath: /project/component[@name='CompilerConfiguration']/option[@name='DEFAULT_COMPILER']
    attribute: "value"
    value: "Eclipse"