Enable CPI Release golang

[OBoehrer]

Outcome of this PR

This PR is a follow up on #278, here we provide the complete implementation of the Golang-implemented job 'openstack_cpi_golang'. This job is completely independent, and can be used as an alternative to the job 'openstack_cpi'.

Background

Maintaining the existing Ruby CPI implies sustaining the used openstack-fog and fog core libraries. But that would be very problematic since the communities for these libraries do not seem to be active since some years now.

Fog isn't just a thin wrapper around the OpenStack API. On the contrary, Fog returns rich modules and classes that need to be refreshed, updated, ... . That means, replacing Fog calls by REST calls isn't a trivial task and will finally end up in a more or less complete re-implementation of the CPI.

A Golang based CPI reimplementation would profit from the existence of an actively maintained Golang SDK for OpenStack (see: https://github.com/gophercloud/gophercloud)

Difference

This is not a 1:1 implementation of the Ruby CPI. We try to improve and change the structure as we best see fit. Deprecated APIs are not supported by this CPI, hence we only support the Octavia APIs, Compute APIs, Networking APIs ... and not the neutron/networking endpoints.

Note

This golang implementation is based on the Ruby version as of Mar 22, 2024.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: OBoehrer (c54a6b4, 51709e2, 2c207d8, b42d4f3, 826769a)
• ✅ login: a-hassanin / name: Ahmed Hassanin (8c86592, 72324e4, 1219c28)

[fmoehler]

Co-authored by @a-hassanin, @anshrupani, @mvach, @ShilpaChandrashekara, @fmoehler

[a-hassanin]

These calls seem to be incompatible with Windows:

https://github.com/OBoehrer/bosh-openstack-cpi-release/blob/c54a6b48f5ec00b787ae7b7ab45894ff5820908a/src/openstack_cpi_golang/cpi/image/root_image/root_image_test.go#L15

https://github.com/OBoehrer/bosh-openstack-cpi-release/blob/c54a6b48f5ec00b787ae7b7ab45894ff5820908a/src/openstack_cpi_golang/cpi/methods/create_stemcell.go#L65

See Go / Run tests and Lint on windows-2019

[a-hassanin]

LGTM

[aramprice]

I'd recommend adding a .golangci.yml, specifically having a longer timeout: can help with windows linting as well as updating the go.yml workflow to something like cloudfoundry/bosh-warden-cpi-release's go.yml

name: go
on:
  push:
    paths:
    - 'src/openstack_cpi_golang/**'
  pull_request:
    paths:
    - 'src/openstack_cpi_golang/**'
jobs:
  lint_and_test:
    strategy:
      matrix:
        os: [macos-latest, ubuntu-latest]
    name: lint and test
    runs-on: ${{ matrix.os }}
    steps:
    - uses: actions/checkout@v4
    - uses: actions/setup-go@v5
      with:
        go-version-file: src/openstack_cpi_golang/go.mod
    - uses: golangci/golangci-lint-action@v6
      with:
        working-directory: src/openstack_cpi_golang/
    - run: run-unit-tests
      working-directory: src/openstack_cpi_golang/
    - run: run-integration-tests
      working-directory: src/openstack_cpi_golang/

And adding a dependabot.yml will keep these Github Actions (rather than hard-coded uses of golangci-lint) up to date.