To create AMI and update launch template

update.bash

#!/bin/bash

AWS="aws"
INSTANCE_NAME=""
EPOCH=$(date +%s)
AMI_ID=""

# To show usage of the script
print_usage() {
  printf "Usage: create-ami.sh -i instance-id -r region -l launch-template-id"
}

# To get caller identity
print_caller_identity() {
    echo "Getting caller identity"
    command="$AWS sts get-caller-identity"
    echo $command
    eval $command
}

# To get instance details
print_instance_info() {
    command="$AWS ec2 describe-instances --instance-ids $1"
    echo "$command"
    i=$(eval $command)
    name=$(echo $i | jq -r '.Reservations[0].Instances[0] | (.Tags[]?|select(.Key=="Name")|.Value)')
    INSTANCE_NAME=$name    
    echo "Instance name: "$INSTANCE_NAME 
}

# To create new ami
create_ami() {
    ami_name="$INSTANCE_NAME-$EPOCH"
    command="$AWS ec2 create-image  --description 'AMI created using jenkins' --instance-id $1 --name $ami_name --no-reboot --tag-specifications 'ResourceType=image,Tags=[{Key=Name,Value=$INSTANCE_NAME}]' 'ResourceType=snapshot,Tags=[{Key=Name,Value=$INSTANCE_NAME}]'"
    echo $command
    result=$(eval $command)
    # result="{ \"ImageId\": \"ami-01d5c8f2c7fc2de94\" }"
    # echo $result
    result=$(echo $result | jq -r '.ImageId')    
    echo "AMI: "$result
    AMI_ID=$result
}

# To update launch template
update_launch_template() {
    command="$AWS ec2 describe-launch-templates --launch-template-ids $1"
    echo "$command"
    current_version=$(eval $command)
    # echo $current_version
    current_version=$(echo $current_version | jq -r ".LaunchTemplates[0].LatestVersionNumber")
    echo "current lt version: "$current_version
    command="$AWS ec2 create-launch-template-version --launch-template-id  $1  --source-version $current_version --launch-template-data '{\"ImageId\": \"$AMI_ID\"}'"
    echo $command
    result=$(eval $command)
    # echo $result
    result=$(echo $result | jq -r ".LaunchTemplateVersion.VersionNumber")
    echo "new lt version: "$result
    command="$AWS ec2 modify-launch-template --launch-template-id $1 --default-version $result"
    echo $command
    eval $command
    
    

}

while getopts "i:r:l:" arg; do
  case $arg in
    i) INSTANCE=$OPTARG;;
    r) REGION=$OPTARG;;
    l) LAUNCH_TEMPLATE=$OPTARG;;
    *) print_usage
        exit 1 ;;
  esac
done
echo "Will be creating ami for $INSTANCE in Region $REGION and update L.T: $LAUNCH_TEMPLATE"
AWS="$AWS --region $REGION"
print_caller_identity
print_instance_info $INSTANCE
create_ami $INSTANCE
update_launch_template $LAUNCH_TEMPLATE