Argo Workflows volume ingress/egress using Google Cloud Storage

template.yaml

---
# This workflow template provides basic Google Cloud Storage I/O.
# Easily transfer data from Cloud Storage into Volumes and vice-versa.
apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: google-cloud-storage
spec:
  templates:

  # Use to get a folder from Google Cloud Storage in to a Volume.
  # Both the gs://source and volume mount are input parameters.
  - name: storage-to-volume
    inputs:
      parameters:
      - name: source
      - name: volume
    container:
      image: google/cloud-sdk:alpine
      command: [gsutil, -m, rsync, -rd, "{{inputs.parameters.source}}", "/mnt/volume"]
      volumeMounts:
        - name: "{{inputs.parameters.volume}}"
          mountPath: /mnt/volume

  # Use to get a complete Volume folder in to Google Cloud Storage.
  # Both the volume mount and gs://target are input parameters.
  - name: volume-to-storage
    inputs:
      parameters:
      - name: volume
      - name: target
    container:
      image: google/cloud-sdk:alpine
      command: [gsutil, -m, rsync, -rd, "/mnt/volume", "{{inputs.parameters.target}}"]
      volumeMounts:
        - name: "{{inputs.parameters.volume}}"
          mountPath: /mnt/volume

workflow.yaml

---
apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: google-cloud-storage-example-
spec:
  entrypoint: workflow
  volumeClaimTemplates:
    - metadata:
        name: example
      spec:
        accessModes: [ "ReadWriteOnce" ]
        resources:
          requests:
            storage: 2Gi
  templates:
  - name: workflow
    steps:

    # Get some data from GCS to a volume
    - - name: ingress
        templateRef:
          name: google-cloud-storage
          template: storage-to-volume
        arguments:
          parameters:
          - name: source
            value: "gs://example/input/"
          - name: volume
            value: example

    # Get some data from a volume to GCS
    - - name: egress
        templateRef:
          name: google-cloud-storage
          template: volume-to-storage
        arguments:
          parameters:
          - name: volume
            value: example
          - name: target
            value: "gs://example/output"