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https://github.com/particledecay/ansible-jsonpatch
An Ansible module for patching JSON files
https://github.com/particledecay/ansible-jsonpatch
Last synced: about 2 months ago
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An Ansible module for patching JSON files
- Host: GitHub
- URL: https://github.com/particledecay/ansible-jsonpatch
- Owner: particledecay
- License: mit
- Created: 2019-01-24T14:34:19.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2024-06-24T20:13:00.000Z (3 months ago)
- Last Synced: 2024-07-09T11:12:09.348Z (3 months ago)
- Language: Python
- Size: 62.5 KB
- Stars: 116
- Watchers: 7
- Forks: 27
- Open Issues: 7
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# ansible-jsonpatch
An Ansible module for patching JSON files
## Description
This Ansible module follows [RFC 6901](https://tools.ietf.org/html/rfc6901) for JSON notation and [RFC 6902](https://tools.ietf.org/html/rfc6902) for JSON patching.
In addition to the standard, there is an extra notation feature not outlined in RFC 6901: you can specify *every* member of an array with a `*` character in the path.
## Installation
In order to make use of this module, download the [json_patch.py](https://raw.githubusercontent.com/ParticleDecay/ansible-jsonpatch/master/json_patch.py) file to the `library` directory in the root of your Ansible project:
```
myproject/
├── ansible.cfg
├── inv/
├── library/
│ ├── json_patch.py
├── playbooks/
├── roles/
```
## Usage
The module `json_patch` takes the following options:
| Name | Description | Choices |
| ------- | --------------- | ------- |
| `src` | The path to a file containing JSON | |
| `dest` | The path to an optional output file to write the patched JSON (default is to overwrite `src` file) | |
| `operations` | A list of valid operations to perform against the given JSON file | See [RFC 6902](https://tools.ietf.org/html/rfc6902#section-4) |
| `backup` | Backup the JSON file (the one that will be overwritten) before editing (default: `no`) | `yes`/`no` |
| `unsafe_writes` | Allow Ansible to fall back to unsafe (i.e. non-atomic) methods of writing files (default: `no`) | `yes`/`no` |
| `pretty` | Write JSON output in human-readable format | `yes`/`no` |
| `create` | Create file if it does not exist | `yes`/`no` |
| `create_type` | Type of JSON structure to create if empty (default: `object`) | `object`/`array` |
#### Operations
Operations may consist of two or more of the following properties:
| Name | Required | Value |
| ---- | -------- | ----- |
| `op` | yes | one of `add`, `remove`, `replace`, `move`, `copy`, or `test` |
| `path` | yes | RFC 6901 JSON notation |
| `from` | no | RFC 6901 JSON notation (only applies to `move` and `copy`)|
| `value` | no | any valid JSON value |
#### Special Notations
There are two special notations:
- The `-` character refers to the *end* of an array (for appending a non-existent value)
- (non-RFC 6901 compliant) The `*` character may refer to *every* member of an array (for testing each member)
## Examples
### ADD
##### Test JSON
```json
{
"foo": "bar"
}
```
##### Patch
```yaml
- name: Add or replace 'baz' member
json_patch:
src: "test.json"
operations:
- op: add
path: "/baz"
value: "quz"
```
##### Patched JSON
```json
{
"foo": "bar",
"baz": "quz"
}
```
### REMOVE
##### Test JSON
```json
[
{"foo": "bar", "baz": "quz"},
{"foo": "qux", "hello": "world"}
]
```
##### Patch
```yaml
- name: Remove the 'hello' property
json_patch:
src: "test.json"
operations:
- op: remove
path: "/1/hello"
```
##### Patched JSON
```json
[
{"foo": "bar", "baz": "quz"},
{"foo": "qux"}
]
```
### REPLACE
##### Test JSON
```json
[
{
"foo": [
{"vegetable": "corn"},
{"vegetable": "broccoli"},
{"vegetable": "tomato"}
]
}
]
```
##### Patch
```yaml
- name: Ensure 'tomato' isn't listed as a vegetable
json_patch:
src: "test.json"
operations:
- op: replace
path: "/0/foo/2/vegetable"
value: "cauliflower"
```
##### Patched JSON
```json
[
{
"foo": [
{"vegetable": "corn"},
{"vegetable": "broccoli"},
{"vegetable": "cauliflower"}
]
}
]
```
### MOVE
##### Test JSON
```json
[
{"one": 1, "two": 2, "six": 6},
{"four": 4, "five": 5, "three": 3}
]
```
##### Patch
```yaml
- name: Move the numbers into their appropriate objects
json_patch:
src: "test.json"
operations:
- op: move
from: "/0/six"
path: "/1/six"
- op: move
from: "/1/three"
path: "/0/three"
```
##### Patched JSON
```json
[
{"one": 1, "two": 2, "three": 3},
{"four": 4, "five": 5, "six": 6}
]
```
### COPY
##### Test JSON
```json
[
{"name": "The Shawshank Redemption", "rating": "good"},
{"name": "The Dark Knight", "rating": "bad"}
]
```
##### Patch
```yaml
- name: Correct the rating for The Dark Knight
json_patch:
src: "test.json"
backup: yes
operations:
- op: copy
from: "/0/rating"
path: "/1/rating"
```
##### Patched JSON
```json
[
{"name": "The Shawshank Redemption", "rating": "good"},
{"name": "The Dark Knight", "rating": "good"}
]
```
### TEST
##### Test JSON
```json
{
"name": "Ansible",
"gitPath": "/home/ubuntu/projects/ansible",
"enabled": true
}
```
##### Patch
```yaml
- name: Ensure the Ansible project is enabled
json_patch:
src: "test.json"
operations:
- op: test
path: "/enabled"
value: true
```
### SPECIAL NOTATIONS
#### End of array character (`-`)
##### Test JSON
```json
{
"media": "/mnt/media",
"scan": [
{"movie": "Independence Day"},
{"movie": "The Sandlot"},
{"movie": "Bird Box"}
]
}
```
##### Patch
```yaml
- name: Add all of our movies to the list
json_patch:
src: "test.json"
operations:
- op: add
path: "/scan/-"
value:
movie: "{{ item }}"
with_items:
- "Se7en"
- "Firestarter"
- "The Last Samurai"
- "Fast and the Furious 17"
```
##### Patched JSON
```json
{
"media": "/mnt/media",
"scan": [
{"movie": "Independence Day"},
{"movie": "The Sandlot"},
{"movie": "Bird Box"},
{"movie": "Se7en"},
{"movie": "Firestarter"},
{"movie": "The Last Samurai"},
{"movie": "Fast and the Furious 17"}
]
}
```
#### Each array member character (`*`)
##### Test JSON
```json
{
"media": "/mnt/media",
"scan": [
{"movie": "Independence Day"},
{"movie": "The Sandlot"},
{"movie": "Bird Box"},
{"movie": "Se7en"},
{"movie": "Firestarter"},
{"movie": "The Last Samurai"},
{"movie": "Fast and the Furious 17"}
]
}
```
##### Patch
```yaml
- name: Ensure The Last Samurai is definitely in our list
json_patch:
src: "test.json"
operations:
- op: test
path: "/scan/*/movie"
value: "The Last Samurai"
```
## Testing
Testing is simple if you have pytest installed:
```bash
pytest
```
Note you may have to copy the `json_patch.py` file into your Ansible installation's `lib/ansible/modules/files/` dir.
## Contributing
PRs welcome! Just make sure you update tests as well.
Current needs:
- Special character handling ([RFC 6901 - Syntax](https://tools.ietf.org/html/rfc6901#section-3))
- Applying `*` support to other operations:
- `add` should affect every member of an array
- `remove` should remove the path from each member of an array
- `replace` should replace for each member of an array