Making k3d-dev.sh more readable and maintainable, using function to run over ssh

docs/assets/scripts/developer/k3d-dev.sh

 #!/bin/bash
 
+function run() {
+  ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "$@"
+}
+
 #### Global variables - These allow the script to be run by non-bigbang devs easily
 if [[ -z "${VPC_ID}" ]]; then
   # default
@@ -320,7 +324,7 @@ ssh-keygen -f "${HOME}/.ssh/known_hosts" -R "${PublicIP}"
 
 echo "ssh init"
 # this is a do-nothing remote ssh command just to initialize ssh and make sure that the connection is working
-until ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "hostname"; do
+until run "hostname"; do
   sleep 5
   echo "Retry ssh command.."
 done
@@ -333,43 +337,43 @@ echo
 echo "starting instance config"
 
 echo "Instance will automatically terminate 8 hours from now unless you alter the root crontab"
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "sudo bash -c 'echo \"\$(date -u -d \"+8 hours\" +\"%M %H\") * * * /usr/sbin/shutdown -h now\" | crontab -'"
+run "sudo bash -c 'echo \"\$(date -u -d \"+8 hours\" +\"%M %H\") * * * /usr/sbin/shutdown -h now\" | crontab -'"
 echo
 
 echo
 echo "updating packages"
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "sudo apt-get -y update"
+run "sudo apt-get -y update"
 
 echo
 echo "installing docker"
 # install dependencies
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "sudo apt-get install -y apt-transport-https ca-certificates curl gnupg lsb-release gnupg-agent software-properties-common"
+run "sudo apt-get install -y apt-transport-https ca-certificates curl gnupg lsb-release gnupg-agent software-properties-common"
 # Add the Docker repository, we are installing from Docker and not the Ubuntu APT repo.
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} 'sudo mkdir -m 0755 -p /etc/apt/keyrings'
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} 'curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg'
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} 'echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null'
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "sudo apt-get update && sudo apt-get -y install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin"
+run 'sudo mkdir -m 0755 -p /etc/apt/keyrings'
+run 'curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg'
+run 'echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null'
+run "sudo apt-get update && sudo apt-get -y install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin"
 
 echo
 echo
 # Add your base user to the Docker group so that you do not need sudo to run docker commands
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "sudo usermod -aG docker ubuntu"
+run "sudo usermod -aG docker ubuntu"
 echo
 
 # install kubectl
 echo Installing kubectl...
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} 'curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"'
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} 'sudo mv /home/ubuntu/kubectl /usr/local/bin/'
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} 'sudo chmod +x /usr/local/bin/kubectl'
+run 'curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"'
+run 'sudo mv /home/ubuntu/kubectl /usr/local/bin/'
+run 'sudo chmod +x /usr/local/bin/kubectl'
 
 echo
 echo
 # install k3d on instance
 echo "Installing k3d on instance"
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "wget -q -O - https://raw.githubusercontent.com/rancher/k3d/main/install.sh | TAG=v5.4.8 bash"
+run "wget -q -O - https://raw.githubusercontent.com/rancher/k3d/main/install.sh | TAG=v5.4.8 bash"
 echo
 echo "k3d version"
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "k3d version"
+run "k3d version"
 echo
 
 echo "creating k3d cluster"
@@ -388,7 +392,7 @@ k3d_command+=" --port 80:80@loadbalancer --port 443:443@loadbalancer --api-port
 if [[ "$METAL_LB" == true ]]; then
   # create docker network for k3d cluster
   echo "creating docker network for k3d cluster"
-  ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "docker network create k3d-network --driver=bridge --subnet=172.20.0.0/16 --gateway 172.20.0.1"
+  run "docker network create k3d-network --driver=bridge --subnet=172.20.0.0/16 --gateway 172.20.0.1"
   k3d_command+=" --k3s-arg \"--disable=servicelb@server:0\" --network k3d-network"
 fi
 
@@ -402,19 +406,19 @@ else
 fi
 
 # Create k3d cluster
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "${k3d_command}"
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "kubectl config use-context k3d-k3s-default"
-ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "kubectl cluster-info"
+run "${k3d_command}"
+run "kubectl config use-context k3d-k3s-default"
+run "kubectl cluster-info"
 
 # Handle MetalLB cluster resource creation
 if [[ "$METAL_LB" == true ]]; then
   echo "installing MetalLB"
-  ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "kubectl create -f https://raw.githubusercontent.com/metallb/metallb/v0.13.9/config/manifests/metallb-native.yaml"
+  run "kubectl create -f https://raw.githubusercontent.com/metallb/metallb/v0.13.9/config/manifests/metallb-native.yaml"
 	# Wait for controller to be live so that validating webhooks function when we apply the config
 	echo "waiting for MetalLB controller"
-	ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "kubectl wait --for=condition=available --timeout 120s -n metallb-system deployment controller"
+	run "kubectl wait --for=condition=available --timeout 120s -n metallb-system deployment controller"
 
-  ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} <<- 'ENDSSH'
+  run <<- 'ENDSSH'
 	#run this command on remote
 	cat << EOF > metallb-config.yaml
 	apiVersion: metallb.io/v1beta1
@@ -437,7 +441,7 @@ if [[ "$METAL_LB" == true ]]; then
 	EOF
 	ENDSSH
 
-  ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} "kubectl create -f metallb-config.yaml"
+  run "kubectl create -f metallb-config.yaml"
 fi
 
 echo "copying kubeconfig to workstation..."
@@ -449,7 +453,7 @@ else  # default is to use public ip
 fi
 
 if [[ "$METAL_LB" == true ]]; then
-  ssh -i ~/.ssh/${KeyName}.pem -o StrictHostKeyChecking=no -o IdentitiesOnly=yes ubuntu@${PublicIP} <<- 'ENDSSH'
+  run <<- 'ENDSSH'
   # run this command on remote
   # fix /etc/hosts for new cluster
   sudo sed -i '/bigbang.dev/d' /etc/hosts