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Ensure that securityContext can be set in Helm chart #130

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aiyengar2
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@aiyengar2 aiyengar2 commented Sep 29, 2023

#131

According to the Kubernetes API reference docs, podSecurityContext should correspond to spec.template.spec.securityContext.

I'm assuming that the intention of exposing securityContext here was to target the [container]securityContext of the main container, which should be spec.template.spec.containers[0].securityContext.

However, since in the current implementation the securityContext and podSecurityContext are indented to the same line, one simply overrides the other. So you see this outcome, where the securityContext overrides the podSecurityContext at a Pod level:

$ helm template --set="securityContext.hi=bye" --set="podSecurityContext.hi=windows" gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContext": .spec.template.spec.containers[0].securityContext}'
podSecurityContext:
  hi: bye
containerSecurityContext: null

To fix this, this commit modifies the indentation to get the correct output. Here is the same command (and a couple of more tests) of the same thing:

$ helm template gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContexts": .spec.template.spec.containers[0].securityContext}'
podSecurityContext: null
containerSecurityContexts: null

$ helm template --set="securityContext.hi=bye" gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContext": .spec.template.spec.containers[0].securityContext}'
podSecurityContext: null
containerSecurityContext:
  hi: bye

$ helm template --set="podSecurityContext.hi=windows" gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContext": .spec.template.spec.containers[0].securityContext}'
podSecurityContext:
  hi: windows
containerSecurityContext: null

$ helm template --set="securityContext.hi=bye" --set="podSecurityContext.hi=windows" gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContext": .spec.template.spec.containers[0].securityContext}'
podSecurityContext:
  hi: windows
containerSecurityContext:
  hi: bye

According to the Kubernetes API reference docs, `podSecurityContext` should correspond to `spec.template.spec.securityContext`.

I'm assuming that the intention of exposing `securityContext` here was to target the `[container]securityContext` of the main container, which should be `spec.template.spec.containers[0].securityContext`.

However, since in the current implementation the `securityContext` and `podSecurityContext` are indented to the same line, one simply overrides the other. So you see this outcome, where the `securityContext` **overrides** the `podSecurityContext` **at a Pod level**:

```bash
$ helm template --set="securityContext.hi=bye" --set="podSecurityContext.hi=windows" gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContext": .spec.template.spec.containers[0].securityContext}'
podSecurityContext:
  hi: bye
containerSecurityContext: null
```

To fix this, this commit modifies the indentation to get the correct output. Here is the same command (and a couple of more tests) of the same thing:

```bash
$ helm template gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContexts": .spec.template.spec.containers[0].securityContext}'
podSecurityContext: null
containerSecurityContexts: null

$ helm template --set="securityContext.hi=bye" gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContext": .spec.template.spec.containers[0].securityContext}'
podSecurityContext: null
containerSecurityContext:
  hi: bye

$ helm template --set="podSecurityContext.hi=windows" gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContext": .spec.template.spec.containers[0].securityContext}'
podSecurityContext:
  hi: windows
containerSecurityContext: null

$ helm template --set="securityContext.hi=bye" --set="podSecurityContext.hi=windows" gmsa charts/gmsa | yq e 'select(.kind == "Deployment") | {"podSecurityContext": .spec.template.spec.securityContext, "containerSecurityContext": .spec.template.spec.containers[0].securityContext}'
podSecurityContext:
  hi: windows
containerSecurityContext:
  hi: bye
```
@k8s-ci-robot k8s-ci-robot added sig/windows Categorizes an issue or PR as relevant to SIG Windows. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. labels Sep 29, 2023
@jsturtevant
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nice catch!
/lgm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aiyengar2, jsturtevant

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@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Sep 29, 2023
@marosset
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marosset commented Oct 2, 2023

/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Oct 2, 2023
@k8s-ci-robot k8s-ci-robot merged commit 7fb3451 into kubernetes-sigs:master Oct 2, 2023
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4 participants