tests: boot imported image as part of GCP cloudapi test

Extend the Cloud API integration test for GCP to also create a Compute
Node instance using the image, boot it and ssh to it. This brings the
GCP integration testing on par with AWS testing.

Use VHD image type for GCP integration testing, because it by default
contains `cloud-init` installed, unlike the VMDK image.

Signed-off-by: Tomas Hozza <thozza@redhat.com>

test/cases/api.sh

@@ -92,9 +92,11 @@ function cleanupGCP() {
   # since this function can be called at any time, ensure that we don't expand unbound variables
   GCP_CMD="${GCP_CMD:-}"
   GCP_IMAGE_NAME="${GCP_IMAGE_NAME:-}"
+  GCP_INSTANCE_NAME="${GCP_INSTANCE_NAME:-}"
 
   if [ -n "$GCP_CMD" ]; then
     set +e
+    $GCP_CMD compute instances delete --zone="$GCP_REGION-a" "$GCP_INSTANCE_NAME"
     $GCP_CMD compute images delete "$GCP_IMAGE_NAME"
     set -e
   fi
@@ -267,10 +269,15 @@ function createReqFileGCP() {
   cat > "$REQUEST_FILE" << EOF
 {
   "distribution": "$DISTRO",
+  "customizations": {
+    "packages": [
+      "postgresql"
+    ]
+  },
   "image_requests": [
     {
       "architecture": "$ARCH",
-      "image_type": "vmdk",
+      "image_type": "vhd",
       "repositories": $(jq ".\"$ARCH\"" /usr/share/tests/osbuild-composer/repositories/"$DISTRO".json),
       "upload_requests": [
         {
@@ -348,6 +355,21 @@ done
 # Verify the image landed in the appropriate cloud provider, and delete it.
 #
 
+# Reusable function, which waits for a given host to respond to SSH
+function _instanceWaitSSH() {
+  local HOST="$1"
+
+  for LOOP_COUNTER in {0..30}; do
+      if ssh-keyscan "$HOST" > /dev/null 2>&1; then
+          echo "SSH is up!"
+          # ssh-keyscan "$PUBLIC_IP" | sudo tee -a /root/.ssh/known_hosts
+          break
+      fi
+      echo "Retrying in 5 seconds... $LOOP_COUNTER"
+      sleep 5
+  done
+}
+
 # Verify image in EC2 on AWS
 function verifyInAWS() {
   $AWS_CMD ec2 describe-images \
@@ -389,15 +411,7 @@ function verifyInAWS() {
   HOST=$(jq -r '.Reservations[].Instances[].PublicIpAddress' "$WORKDIR/instances.json")
 
   echo "⏱ Waiting for AWS instance to respond to ssh"
-  for LOOP_COUNTER in {0..30}; do
-      if ssh-keyscan "$HOST" > /dev/null 2>&1; then
-          echo "SSH is up!"
-          # ssh-keyscan "$PUBLIC_IP" | sudo tee -a /root/.ssh/known_hosts
-          break
-      fi
-      echo "Retrying in 5 seconds... $LOOP_COUNTER"
-      sleep 5
-  done
+  _instanceWaitSSH "$HOST"
 
   # Check if postgres is installed
   ssh -oStrictHostKeyChecking=no -i ./keypair.pem "$SSH_USER"@"$HOST" rpm -q postgresql
@@ -429,6 +443,30 @@ function verifyInGCP() {
     echo "GCP image wasn't shared with the GCP_API_TEST_SHARE_ACCOUNT. 😢"
     exit 1
   fi
+
+  # Verify that the image boots and have customizations applied
+  # Create SSH keys to use
+  GCP_SSH_KEY="$WORKDIR/id_google_compute_engine"
+  ssh-keygen -t rsa -f "$GCP_SSH_KEY" -C "$SSH_USER" -N ""
+  GCP_SSH_METADATA_FILE="$WORKDIR/gcp-ssh-keys-metadata"
+
+  echo "${SSH_USER}:$(cat "$GCP_SSH_KEY".pub)" > "$GCP_SSH_METADATA_FILE"
+
+  # create the instance
+  GCP_INSTANCE_NAME="gcp-instance-$(uuidgen)"
+
+  $GCP_CMD compute instances create "$GCP_INSTANCE_NAME" \
+    --zone="$GCP_REGION-a" \
+    --image-project="$GCP_PROJECT" \
+    --image="$GCP_IMAGE_NAME" \
+    --metadata-from-file=ssh-keys="$GCP_SSH_METADATA_FILE"
+  HOST=$($GCP_CMD compute instances describe "$GCP_INSTANCE_NAME" --zone="$GCP_REGION-a" --format='get(networkInterfaces[0].accessConfigs[0].natIP)')
+
+  echo "⏱ Waiting for GCP instance to respond to ssh"
+  _instanceWaitSSH "$HOST"
+
+  # Check if postgres is installed
+  ssh -oStrictHostKeyChecking=no -i "$GCP_SSH_KEY" "$SSH_USER"@"$HOST" rpm -q postgresql
 }
 
 case $CLOUD_PROVIDER in