Unable to build `pack` images that don't also have `s2i` builders when `s2i` is the default

[tvand]

According to the Release Notes, Openshift Serverless Operator 1.26 comes with kn 1.5.0 and kn func plugin 1.8.1.

With these versions
kn func create --language node
creates a func.yaml that uses a different specification version (previous was 0.25.0):

specVersion: 0.34.0
name: kn-1-5-0
runtime: node
registry: ""
image: ""
imageDigest: ""
created: 2023-01-11T16:41:50.0787175+01:00
invocation:
  format: http
build:
  buildpacks: []
  builder: ""
  buildEnvs: []
run:
  volumes: []
  envs: []
deploy:
  namespace: ""
  annotations: {}
  options: {}
  labels: []
  healthEndpoints:
    liveness: /health/liveness
    readiness: /health/readiness

This format is not covered by the reference documentation AFAICS.

Where can I find the current documentation?

[lance]

@tvand thanks for pointing out the documentation needs updating! Until that happens, you can see the schema for the current func.yaml here https://github.com/knative/func/blob/main/schema/func_yaml-schema.json

[lkingland]

Also perhaps worth noting is that the func.yaml of existing functions will be automatically migrated forward.

[tvand]

Do you have a working example we can start from?
kn func deploy does not accept builder: pack and keeps rewriting it to builder: s2i.

[lance]

Hi @tvand I don't think this answers your question about the builder field, but wanted to share it anyway for completeness. In the example below, I have a function project created with func v1.7.1 and you can see the func.yaml contents. I then build the function using a newer version func v1.8.1 and the func.yaml file is automatically upgraded.

bat func.yaml
───────┬─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
       │ File: func.yaml
───────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ specVersion: 0.25.0
   2   │ name: test-func
   3   │ namespace: ""
   4   │ runtime: node
   5   │ registry: ""
   6   │ image: ""
   7   │ imageDigest: ""
   8   │ buildpacks: []
   9   │ builder: ""
  10   │ volumes: []
  11   │ buildEnvs: []
  12   │ envs: []
  13   │ annotations: {}
  14   │ options: {}
  15   │ labels: []
  16   │ healthEndpoints:
  17   │   liveness: /health/liveness
  18   │   readiness: /health/readiness
  19   │ created: 2023-01-16T15:48:18.506635-05:00
  20   │ invocation:
  21   │   format: http
───────┴─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
func build
   🙌 Function image built: quay.io/lanceball/test-func:latest
bat func.yaml
───────┬─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
       │ File: func.yaml
───────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ specVersion: 0.34.0
   2   │ name: test-func
   3   │ runtime: node
   4   │ registry: quay.io/lanceball
   5   │ image: quay.io/lanceball/test-func:latest
   6   │ imageDigest: ""
   7   │ created: 2023-01-16T15:48:18.506635-05:00
   8   │ invocation:
   9   │   format: http
  10   │ build:
  11   │   buildpacks: []
  12   │   builder: pack
  13   │   buildEnvs: []
  14   │ run:
  15   │   volumes: []
  16   │   envs: []
  17   │ deploy:
  18   │   namespace: ""
  19   │   annotations: {}
  20   │   options: {}
  21   │   labels: []
  22   │   healthEndpoints:
  23   │     liveness: /health/liveness
  24   │     readiness: /health/readiness
───────┴─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Can you try building once with the existing values in func.yaml using func v1.8.1, then modify the build: builder: field?

[tvand]

I'll try to show what happens (Disclaimer: this is not my own serverless test, so bear with me if something is incomplete)

This is the working example before upgrade. It has been created with kn 1.3.1 (where deployment works fine)

Then we try to deploy it with kn 1.5.0 which fails:

Now the func. yaml looks like this:

See the line builder: s2i in the file. If we change this to builder: pack and run kn 1.5.0 again, we get the same error message and the field is reset to builder: s2i in the file. We reverted to kn 1.3.1 for now but we would like to understand how to actually resolve this.

[lance]

@tvand can you provide a link to the project?

[lance]

See the line builder: s2i in the file. If we change this to builder: pack and run kn 1.5.0 again, we get the same error message and the field is reset to builder: s2i in the file. We reverted to kn 1.3.1 for now but we would like to understand how to actually resolve this.

Hmm - I am not able to reproduce this issue using the upstream binaries. I think it might have something to do with the changes we make in midstream to default builds to s2i. I will look into this.

[lance]

See the line builder: s2i in the file. If we change this to builder: pack and run kn 1.5.0 again, we get the same error message and the field is reset to builder: s2i in the file. We reverted to kn 1.3.1 for now but we would like to understand how to actually resolve this.

Confirmed that I can reproduce this issue using downstream kn func.

/kind bug

[lance]

@tvand instead of modifying func.yaml directly, can you please try building with 1.5 using the command line flag?

kn func build --builder pack

[tvand]

Unfortunately, I cannot provide a link to the project as it is internally hosted. I'll try the suggested command line flag, however.

[lance]

@tvand I believe this is fixed in #1519 however you won't see it in the downstream product until Serverless 1.29, expected release date April 25.