Description

Ensure that all fields of the FunctionStatus are populated based on
the function Deployment. In particular, this change ensures that the
env variables, constrains, and the read-only root filesystem values are
populated correctly.

Found while updating the faas-cli, see openfaas/faas-cli#915

Motivation and Context

• I have raised an issue to propose this change (required)

Resolves #922

How Has This Been Tested?

The extended unit tests fully cover the new code.

As stated in the PR title, this adds missing fields to the function info endpoint: /system/function/{function_name}

Without this change, the endpoint misses values like readOnlyFilesystem

$ curl -s http://localhost:8080/system/function/echo | jq
{
 "name": "echo",
 "image": "ghcr.io/lucasroesler/echo:latest",
 "namespace": "openfaas-fn",
 "labels": {
 "faas_function": "echo",
 "uid": "351420882"
 },
 "annotations": {
 "foo": "bar",
 "prometheus.io.scrape": "false"
 },
 "replicas": 1,
 "availableReplicas": 1,
 "createdAt": "2022年06月11日T14:40:28Z"
}

With this change

$ curl -s http://localhost:8080/system/function/echo | jq
{
 "name": "echo",
 "image": "ghcr.io/lucasroesler/echo:latest",
 "namespace": "openfaas-fn",
 "labels": {
 "faas_function": "echo",
 "uid": "351420882"
 },
 "annotations": {
 "foo": "bar",
 "prometheus.io.scrape": "false"
 },
 "readOnlyRootFilesystem": true,
 "replicas": 1,
 "availableReplicas": 1,
 "createdAt": "2022年06月11日T14:40:28Z"
}

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s
• I have added tests to cover my changes.
• All new and existing tests passed.