support existing containers, single service & Multi-service with no dependencies

[yangcao77]

Which area this feature is related to?

/area library

Which functionality do you think we should add?

Why is this needed? Is your feature request related to a problem?

Detailed description:

The docker-compose file is only relying on containers that are already built and available in the container catalog (docker-compose not relying on dockerfiles). We should be able to use the docker-compose file and use its services as components for the devfile.

Targets: We would need to formalize an improvement to the specification, so that it is possible to link devfile components from the docker-compose file - so it'll not be a "conversion" of the docker-compose file to devfile, but a way to use the docker-compose and the devfile together.

Implementation:

Directly use Kompose and convert to a kubernetes component in devfile. Document the limitation of the conversion. (will be from Kompose tool)

Add a way to refer to a docker-compose file from the devfile, e.g. a docker-compose component element. (should be similar to image component, with a uri reference) Update the parsing model in the devfile library with a flag, for devfiles with the docker-compose component, convert the docker-compose component to other existing components using the library above, e.g. kubernetes components, and replace the docker-compose component with those generated components

Describe alternatives you've considered

1) Podman: Limited documentation + only available for CLI. 2) Parsing the inputs, building an intermediate representation, output the desired files: No documentation available + better considered for supporting new container implementation.

Additional context

[yangcao77]

blocked by #1120

[Mahajanet]

Investigating Kompose repository to import package for use. Adopted new schema + created flag in the parsing module. Working on convertor utils function to build kubernetes files on disk.

[amisevsk]

Potential blocker for this issue: https://github.com/kubernetes/kompose/issues/464

[Mahajanet]

In the next release of Kompose 1.29.0, there will be in built support to convert docker compose files into kubernetes objects. Presently, using select kompose library functions for conversion.

[Mahajanet]

Finished conversion of Docker-Compose to Kube representation, and further conversion to a Kube component. Currently testing for each case (uri + url + inline). Next step will be applying some commands to the components and clean up before a PR.

[Mahajanet]

Create a draft PR detailing the tasks finished and the tasks to be completed next.

[yangcao77]

things left to be done:

• cmds associated with the kube components need to be added
• revert back kube components and cmds added when calling devfileObj.writeYaml
• clean up for temp folder after the operation or upon errors
• unit tests