Replacement with regex support for selectors

[sda399]

Eschewed features

• This issue is not requesting templating, unstuctured edits, build-time side-effects from args or env vars, or any other eschewed feature.

What would you like to have added?

I would like to add regex support in replacement selectors

Why is this needed?

Supporting regex in replacement selectors would:

• reduce redundancy of replacement blocks, by targeting multiple objects with regex
• harmonize replacement selectors with the patch selectors that already support regex
• make it possible to migrate from patches to replacements

Can you accomplish the motivating task without this feature, and if so, how?

example: replace image tag using deploy1 into depoly2, st1 and st2:

apiVersion: v1
kind: Deployment
metadata:
  name: deploy1
spec:
  template:
    spec:
      containers:
      - image: nginx:1.27.4
        name: nginx-tagged
---
apiVersion: v1
kind: Deployment
metadata:
  name: deploy2
spec:
  template:
    spec:
      containers:
      - image: nginx:1.5
        name: nginx-tagged
---
apiVersion: v1
kind: Statefulset
metadata:
  name: st1
spec:
  template:
    spec:
      containers:
      - image: nginx:1.5
        name: nginx-tagged
---
apiVersion: v1
kind: Statefulset
metadata:
  name: st2
spec:
  template:
    spec:
      containers:
      - image: nginx:1.5
        name: nginx-tagged

current solution:

replacements:
- source:
    kind: Deployment
    name: deploy1
    fieldPath: spec.template.spec.containers.0.image
  targets:
  - select:
      kind: Deployment
      name: deploy2
    fieldPaths:
    - spec.template.spec.containers.0.image
  - select:
      kind: StatefulSet
      name: st1
    fieldPaths:
    - spec.template.spec.containers.0.image
 - select:
      kind: StatefulSet
      name: st2
    fieldPaths:
    - spec.template.spec.containers.0.image

What other solutions have you considered?

proposed solution:

replacements:
- source:
    kind: Deployment
    name: deploy1
    fieldPath: spec.template.spec.containers.0.image
  targets:
  - select:
      kind: Deployment|StatefulSet
      name: deploy2|st.*
    fieldPaths:
    - spec.template.spec.containers.0.image

Anything else we should know?

No response

Feature ownership

• I am interested in contributing this feature myself! 🎉

[k8s-ci-robot]

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[sda399]

If the projects' PR or triage process, requires any missing step or more details, I'll be happy to help 💯
@koba1t @stormqueen1990