Running multiple postStart events is not allowed

[MazArslan]

Description

When I try to use multiple post start events, i get an error saying that Error processing devfile: component tools has multiple postStart events attached to it. As per the devfile 2 schema validation, this is a valid syntax, since both, postStart and commands are accepting array of elements.

How To Reproduce

schemaVersion: 2.1.0
metadata:
  name: demo-project
components:
  - name: tools
    container:
      image: quay.io/devfile/universal-developer-image:ubi8-f5ffca8
      memoryRequest: 1Gi
      memoryLimit: 3Gi
      cpuLimit: 1000m
      cpuRequest: 500m
commands:
  - id: second-command
    exec:
      component: tools
      commandLine: "echo second command"
  - id: install
    exec:
      component: tools
      commandLine: "/home/user/.sdkman/candidates/jbang/current/bin/jbang trust add -o --fresh --quiet https://github.com/apache/camel/blob/HEAD/dsl/camel-jbang/camel-jbang-main/dist/CamelJBang.java"
events:
  postStart:
    - install
    - second-command

create 2 commands and use both on a post start

when trying to run use the devfile getting this issue when trying to create workspace
Error processing devfile: component tools has multiple postStart events attached to it

Expected behavior

to apply the both/multiple post start events.

Additional context

[amisevsk]

The reason postStart is a list of strings is to allow running multiple postStart commands in separate containers (e.g. containerA and containerB), and this should be supported by DWO without further changes. For example, the following devfile should have no issue

schemaVersion: 2.1.0
metadata:
  name: demo-project
components:
  - name: tools
    container:
      image: quay.io/devfile/universal-developer-image:ubi8-f5ffca8
  - name: database
    container:
      image: quay.io/devfile/universal-developer-image:ubi8-f5ffca8
commands:
  - id: second-command
    exec:
      component: tools
      commandLine: "echo second command"
  - id: install
    exec:
      component: database
      commandLine: "/home/user/.sdkman/candidates/jbang/current/bin/jbang trust add -o --fresh --quiet https://github.com/apache/camel/blob/HEAD/dsl/camel-jbang/camel-jbang-main/dist/CamelJBang.java"
events:
  postStart:
    - install
    - second-command

I'd love to support multiple poststart events for the same component, but it would be difficult to do -- the underlying mechanism used is Kubernetes lifecycle hooks, which only support a single command per container. To implement such functionality in DWO would require either managing lifecycle hooks ourselves (which DWO is not suited to do) or figuring out a safe way to chain arbitrary commands (which I don't believe is fully possible).

[l0rd]

This has become critical after this issue has been addressed.

Downstream issue