Add readme explaining basic schema
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Waqar Ahmed
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# iX Official Catalog
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A curated collection of TrueNAS SCALE enhanced Helm charts.
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## TrueNAS SCALE Chart Structure
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A TrueNAS SCALE chart repository differs slightly in directory structure from upstream repos in that it includes an `app version` directory.
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A TrueNAS SCALE chart also has three additional files an `app-readme.md` file that provides a high level overview display in the TrueNAS SCALE UI and a `questions.yaml` file defining questions to prompt the user with and an `item.yaml` file outlining item specific details.
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There are 2 directories `charts` and `test`, each representing a train. Chart releases created from catalog items in a specific train cannot be moved to another train.
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```
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charts/ix-chart/<chart version>/
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app-readme.md # TrueNAS SCALE Specific: Readme file for display in TrueNAS SCALE UI
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charts/ # Directory containing dependency charts
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Chart.yaml # Required Helm chart information file
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questions.yaml # TrueNAS SCALE Specific: File containing questions for TrueNAS SCALE UI
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README.md # Optional: Helm Readme file (will be rendered in TrueNAS SCALE UI as well)
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requirements.yaml # Optional YAML file listing dependencies for the chart
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templates/ # A directory of templates that, when combined with values.yml will generate K8s YAML
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values.yaml # The default configuration values for this chart
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```
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*See the upstream Helm chart [developer reference](https://helm.sh/docs/topics/chart_template_guide/) for a complete walk through of developing charts.*
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To convert an upstream chart to take advantage of TrueNAS SCALE enhanced UX, first create an `item.yaml` file.
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This file among other catalog item information provides a list of categories that this chart fits into. This helps users navigate and filtering when browsing the catalog UI.
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```
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$ cat charts/ix-chart/item.yaml
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categories:
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- generic
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icon_url: "http://ix_url"
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```
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After that create `app-readme.md` file.
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```
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$ cat charts/ix-chart/<chart version>/app-readme.md
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# Wordpress ROCKS!
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```
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Then add a `questions.yaml` file to prompt the user for something.
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```
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groups:
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- name: "Container Images"
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description: "Image to be used for container"
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questions:
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- variable: image
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description: "Docker Image Details"
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group: "Container Images"
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schema:
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type: dict
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required: true
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attrs:
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- variable: repository
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description: "Docker image repository"
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label: "Image repository"
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schema:
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type: string
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required: true
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- variable: tag
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description: "Tag to use for specified image"
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label: "Image Tag"
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schema:
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type: string
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default: "latest"
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- variable: pullPolicy
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description: "Docker Image Pull Policy"
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label: "Image Pull Policy"
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schema:
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type: string
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default: "IfNotPresent"
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enum:
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- "IfNotPresent"
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- "Always"
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- "Never"
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```
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The above will prompt the user with 2 text fields and a dropdown in the UI getting details for image configuration in a helm chart.
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#### Question Variable Reference
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| Variable | Type | Required | Description |
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| ------------- | ------------- | --- |------------- |
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| variable | string | true | define the variable name specified in the `values.yaml`file. |
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| label | string | true | define the UI label. |
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| description | string | false | specify the description of the variable. |
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| group | string | false | group questions by input value. |
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| schema | dictionary | true | specify schema details for the `variable` |
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| schema.type | string | true | specify type of value for `variable` (current supported types are string, int, boolean, path, hostpath, list, dict, ipaddr, and cron).|
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| schema.required | bool | false | define if the variable is required or not (true \ false), defaults to false |
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| schema.default | object | false | specify the default value. |
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| schema.min_length | int | false | min character length for string type variable.|
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| schema.max_length | int | false | max character length for string type variable.|
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| schema.min | int | false | min integer length. |
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| schema.max | int | false | max integer length. |
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| schema.enum | []string | false | specify the options when the variable type is `string`, for example, <br><br>enum:<br> - "RollingUpdate" <br> - "Recreate"|
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| schema.valid_chars | string | false | regular expression for input chars validation. |
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| schema.subquestions | []subquestion | false | add an array of subquestions.|
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| schema.show_if | string | false | show current variable if condition specified is true, for example `show_if: [["workloadType", "=", "CronJob"]]` |
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| schema.show_subquestions_if | string | false | show subquestions if is true or equal to one of the options. for example `show_subquestion_if: "static"`. system will convert this to the filters format specifid for `shcema.show_if` automatically.|
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| schema.attrs | []variables | false | specified when `schema.type` is dictionary to declare attributes allowed in the dictionary. |
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| schema.items | []variables | false | specified when `schema.type` is list to declare attributes allowed in the list. |
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**subquestions**: `subquestions[]` cannot contain `subquestions` or `show_subquestions_if` keys, but all other keys in the above table are supported. Also variables having `schema.type` list do not support `subquestions`.
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