CODEWITHSUNDEEP
kubernetesyamlkubernetes-helmyq
gdix0n
gdix0n

Reputation: 254

How to update a multi document yaml file on condition using yq?

I am trying to add namespace to a multi document kubernetes yaml file if it doesn't exist but if the namespace field already exists don't update it using yq but i can't seem to get it to work. Is this possible?

e.g.

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: serviceaccount1
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: serviceaccount2
  namespace: namespace2

should end up something like this:

apiVersion: v1
kind: ServiceAccount
metadata:
  name: serviceaccount1
  namespace: namespace1
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: serviceaccount2
  namespace: namespace2

UPDATE:

After successfully updating the yaml file thanks to:

https://stackoverflow.com/a/74736018/16126608

I am getting the namespace populated however due to the fact my yaml file was produced as an output of a helm template I am seeing the following issue where an empty document is having {} added as a result of the yq command, e.g.

---
# Source: path/to/chart/templates/configmap.yaml
---
# Source: ppath/to/chart/templates/network-policy.yaml
---

Is coming out like this afterwards:

---
# Source: path/to/chart/templates/configmap.yaml
---
{}
# Source: path/to/chart/templates/network-policy.yaml
---
{}

Is it possible to have yq to not add the {} and ignore the empty documents?

I am using mikefarah/yq

Upvotes: 0

Views: 1312

Answers (1)

pmf
pmf

Reputation: 36033

You can use has to check the existence of a field, and not to negate, then select it and add the new field.

Which implementation of yq are you using?

Using kislyuk/yq:

yq -y 'select(.metadata | has("namespace") | not).metadata.namespace = "namespace1"'

Using mikefarah/yq:

yq 'select(.metadata | has("namespace") | not) |= .metadata.namespace = "namespace1"'

Upvotes: 2

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