Can't figure out how to do variable substitution in my Tekton pipeline

Question

So I'm not sure if this is actually a Bash issue or a Tekton issue. The problem occurs in my OpenShift (Tekton) pipeline. After having deployed my application, I have a step where I need to check if the Deployment has actually been created.

This is done like this:

until oc get deployment.apps/my-app-foo &> /dev/null
do
  echo . 
  sleep 2
done

In the snippet above, I've hardcoded the name of the Deployment "my-app". The suffix "-foo" is part of every Deployment resource. When hardcoded, it works, and I get my Deployment, as expected.

When I try to parameterize the name of the Deployment, my pipeline fails with the following error:

Error from server (NotFound): deployments.apps "my-app" not found
.
Error from server (NotFound): deployments.apps "my-app" not found
.
Error from server (NotFound): deployments.apps "my-app" not found
.

So the issue is obviously that the "-foo" suffix isn't added to my variable, and I can't figure out how to do this. Tried replacing the parentheses with curly braces, tried double quotes around the entire expression, and a few other variants.

Here's my code with variable substitution:

until oc get deployment.apps/$(params.pod-name)-foo &> /dev/null
do
  echo . 
  sleep 2
done

Can anyone tell what I'm doing wrong?

Answer 1

Not entirely sure what the issue is, but seems it has something to do with Tekton variable substitution syntax.

Anyway, I managed to work around it by assigning the Tekton parameter to a bash variable, like this:

POD_NAME=$(params.pod-name)
SUFFIX='-foo'

And then I used these variables straight forward in the until loop like this:

until oc get deployment.apps/${POD_NAME}${SUFFIX} &> /dev/null
do
  echo . 
  sleep 2
done

PS. The suffix would probably work fine without being put in a variable, but I'm using it some other places in the same script, so that's why I put it there.