Add script & instructions for in-place upgrade test.

test/e2e/README.md

@@ -26,3 +26,57 @@ go test -v -timeout 0 ./... -report-dir=$ARTIFACTS -ginkgo.focus="\[efs-csi\]" -
 ```
 
 The E2E flags that you can pass to `go test` are defined in [e2e_test.go](https://github.com/kubernetes-sigs/aws-efs-csi-driver/blob/master/test/e2e/e2e_test.go#L66-L75).
+
+
+### Running Upgrade Test
+In order to test upgrades from previous releases to the current development version of the driver, the following steps can be followed:
+
+1. Ensure the EFS CSI Driver is not currently deployed on your cluster.
+2. Ensure that the EFS CSI Node and Controller service accounts are deployed on your cluster. Ex:
+```
+$ cat ~/efs-service-account.yaml 
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  labels:
+    app.kubernetes.io/name: aws-efs-csi-driver
+  name: efs-csi-controller-sa
+  namespace: kube-system
+  annotations:
+    eks.amazonaws.com/role-arn: arn:aws:iam::123456789:role/test-cluster-iam-sa-role
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  labels:
+    app.kubernetes.io/name: aws-efs-csi-driver
+  name: efs-csi-node-sa
+  namespace: kube-system
+  annotations:
+    eks.amazonaws.com/role-arn: arn:aws:iam::123456789:role/test-cluster-iam-sa-role
+
+$ kubectl apply -f ~/efs-service-account.yaml
+```
+3. Run the upgrade script, for example:
+```sh
+# The release version of the driver you would like to test upgrading from. 
+# Pulls most recent image from the release-$PREV_RELEASE branch
+PREV_RELEASE=1.7
+# Region of private ECR
+REGION=us-east-1
+# Account of private ECR
+ACCOUNT=123456789
+chmod +x ./upgrade_driver_version.sh
+./upgrade_driver_version.sh $PREV_RELEASE $REGION $ACCOUNT
+```
+4. Run the e2e tests, note that $REGION should be that of the EKS cluster.
+```sh
+export KUBECONFIG=$HOME/.kube/config
+go test -v -timeout 0 ./... -report-dir=$ARTIFACTS -ginkgo.focus="\[efs-csi\]" -ginkgo.skip="\[Disruptive\]" \
+  --file-system-id=$FS_ID --create-file-system=false --deploy-driver=false --region=$REGION
+```
+5. Clean Up: The driver + kubernetes service accounts can be cleaned up via the following command:
+```sh
+kubectl delete -k github.com/kubernetes-sigs/aws-efs-csi-driver/deploy/kubernetes/overlays/stable/?ref=master
+```

test/e2e/upgrade_driver_version.sh

@@ -0,0 +1,86 @@
+#!/bin/sh
+set -eux
+
+# Check for dependencies
+if ! command -v kubectl &> /dev/null; then
+  echo "kubectl is not installed."
+  exit 1
+fi
+if ! command -v docker &> /dev/null; then
+  echo "Docker is not installed."
+  exit 1
+fi
+if ! command -v aws &> /dev/null; then
+  echo "AWS CLI is not installed."
+  exit 1
+fi
+
+prevRelease=$1
+region=$2
+account=$3
+
+# The private ECR Repo is expected to take the following format:
+# $account.dkr.ecr.$region.amazonaws.com/aws-efs-csi-driver
+ecrRegistry="$account.dkr.ecr.$region.amazonaws.com"
+ecrRepo="aws-efs-csi-driver"
+
+# Make temp folder for temp files
+mkdir ./temp
+publicDriverManifest="./temp/public-driver-manifest.yaml"
+
+# Build & push image of driver's development version
+cd ../.. && make 
+aws ecr get-login-password --region $region | docker login --username AWS --password-stdin $ecrRegistry
+docker build --pull --no-cache -t aws-efs-csi-driver .
+docker tag aws-efs-csi-driver:latest $ecrRegistry/$ecrRepo:latest
+docker push $ecrRegistry/$ecrRepo:latest
+cd ./test/e2e
+
+# Download starting version manifest
+kubectl kustomize \
+    "github.com/kubernetes-sigs/aws-efs-csi-driver/deploy/kubernetes/overlays/stable/?ref=release-$prevRelease" > $publicDriverManifest
+
+# Remove the predefined service accounts
+awk '
+  /apiVersion: v1/ {recording=1} 
+  recording && /app.kubernetes.io\/name: aws-efs-csi-driver/ {found=1} 
+  recording && /name: efs-csi-controller-sa/ {controller_sa=1} 
+  recording && /name: efs-csi-node-sa/ {node_sa=1} 
+  recording && /---/ {
+    if (found && (controller_sa || node_sa)) {
+      recording=0; found=0; controller_sa=0; node_sa=0; next
+    }
+  }
+  !recording {print}
+' $publicDriverManifest > ./temp/temp.yaml && mv ./temp/temp.yaml $publicDriverManifest
+
+# Deploy starting version of driver for the upgrade test
+kubectl apply -f $publicDriverManifest
+
+# Tear down starting version
+kubectl delete -f $publicDriverManifest
+
+# Create private manifest file & modify to use the private ecr repo
+privateDriverManifest="./temp/private-driver-manifest.yaml"
+kubectl kustomize \
+    "github.com/kubernetes-sigs/aws-efs-csi-driver/deploy/kubernetes/overlays/stable/ecr/?ref=release-$prevRelease" > $privateDriverManifest
+
+sed -i -e "s|602401143452.dkr.ecr.us-west-2.amazonaws.com/eks/aws-efs-csi-driver:v[0-9]\+\.[0-9]\+\.[0-9]\+|$account.dkr.ecr.$region.amazonaws.com/aws-efs-csi-driver:latest|" $privateDriverManifest
+
+# Remove the predefined service accounts
+awk '
+  /apiVersion: v1/ {recording=1} 
+  recording && /app.kubernetes.io\/name: aws-efs-csi-driver/ {found=1} 
+  recording && /name: efs-csi-controller-sa/ {controller_sa=1} 
+  recording && /name: efs-csi-node-sa/ {node_sa=1} 
+  recording && /---/ {
+    if (found && (controller_sa || node_sa)) {
+      recording=0; found=0; controller_sa=0; node_sa=0; next
+    }
+  }
+  !recording {print}
+' $privateDriverManifest > ./temp/temp.yaml && mv ./temp/temp.yaml $privateDriverManifest
+
+kubectl apply -f $privateDriverManifest
+
+rm -rf ./temp