orb.yml

version: 2.1
description: "Deploy images to Argo-managed cluster using Kustomize"

commands:
  deploy-service:
    description: "Updates the image tag for a service."

    parameters:
      environment:
        description: "[Description] Environment in which service is being deployed (e.g. prod/non-prod)."
        type: string
      service-name:
        description: "[Description] Service name being deployed (e.g. Public API Bookings)."
        type: string
      service-image-new-name:
        description: "URI of service image to deploy (excluding tag)."
        type: string
      service-image-current-name:
        description: "Text specified in image name field for deploying service."
        type: string
      service-image-new-tag:
        description: "Image Registry tag of service to be deployed"
        type: string
      gitops-repo:
        description: "URL for repository containing kubernetes manifests."
        type: string
      gitops-username:
        description: "Username to associate with git actions."
        type: string
      gitops-email:
        description: "Email to associate with git actions."
        type: string
      gitops_overlay_path:
        description: "Path to overlay with kustomization.yaml to be updated."
        type: string
      gitops-deploy-branch:
        description: "Branch in which to update image tag"
        type: string
        default: "main"
      gitops-repo-ssh-key-fingerprint:
        description: "The github SSH key that will be used to update the repository."
        type: string
        default: ""
      gitops-repo-ssh-key-host:
        description: 'A host identifier to be set if multiple "Additional SSH keys" require a custom host to be set for the gitops repository, so as not to confict with another host.'
        type: string
        default: ""
      gitops-repo-ssh-key-hostname:
        description: "Optional HostName to update ssh config with, if gitops-repo-host is set."
        type: string
        default: github.com

    steps:
      - attach_workspace:
          at: /tmp/workspace

      - when:
          condition: << parameters.gitops-repo-ssh-key-fingerprint >>
          steps:
            - add_ssh_keys:
                fingerprints:
                  - << parameters.gitops-repo-ssh-key-fingerprint >>

      - when:
          condition: << parameters.gitops-repo-ssh-key-host >>
          steps:
            - run:
                name: Update SSH config hostnames
                command: |
                  sed -i -e 's/Host << parameters.gitops-repo-ssh-key-host >>/Host << parameters.gitops-repo-ssh-key-host >>\n  HostName << parameters.gitops-repo-ssh-key-hostname >>/g' ~/.ssh/config

      - run:
          name: Clone repo
          command: |
            git clone << parameters.gitops-repo >> /tmp/gitops

      - run:
          name: Install Kustomize CLI tool
          command: |
            KUSTOMIZE_VERSION=4.0.2
            KUSTOMIZE_DL_FILE=kustomize_v${KUSTOMIZE_VERSION}_linux_amd64.tar.gz
            curl -L -O https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv${KUSTOMIZE_VERSION}/${KUSTOMIZE_DL_FILE}
            tar -xzf ${KUSTOMIZE_DL_FILE}
            sudo mv kustomize /usr/local/bin/kustomize
            sudo chmod u+x /usr/local/bin/kustomize
            kustomize version

      - run:
          name: Update image tag
          command: |
            cd /tmp/gitops/<< parameters.gitops_overlay_path >>
            kustomize edit set image << parameters.service-image-current-name >>=<< parameters.service-image-new-name >>:<< parameters.service-image-new-tag >>

      - run:
          name: Commit and push changes
          command: |
            cd /tmp/gitops
            git config user.email "<< parameters.gitops-email >>"
            git config user.name "<< parameters.gitops-username >>"
            git add --all
            if [ -z "$(git status --porcelain)" ]; then
              echo "No changes detected."
            else
              git commit -m "Set << parameters.service-name >> << parameters.environment >> image tag to << parameters.service-image-new-tag >>"
              git push origin << parameters.gitops-deploy-branch >>
            fi