function for createing template from cloud image on pve

create_debian_template.sh

#!/bin/bash
function create_template() {
    if [ $# -ne 6 ]; then
        echo "Usage: $0 URL TEMPLATE_ID TEMPLATE_NAME DATASTORE BRIDGE VLAN_ID"
        echo "Cannot init creation if not all args are set, exiting..."
        return 1
    fi

    URL=$1
    TM_ID=$2
    TM_NAME=$3
    DATASTORE=$4
    BRIDGE=$5
    VLAN=$6

    # check if vm already exists
    if [ $(qm list | grep -c $TM_ID) -eq 1 ]; then
        echo "VM with ID $TM_ID already exists, exiting..."
        return 1
    fi

    # check if template already exists
    if [ $(qm list | grep -c $TM_NAME) -eq 1 ]; then
        echo "Template with name $TM_NAME already exists, exiting..."
        return 1
    fi

    FILE="${1##*/}"

    echo "Download the image from $URL"
    wget "$URL"

    # check if the file was downloaded
    if [ ! -f $FILE ]; then
        echo "Error when download $FILE , exiting..."
        return 1
    fi

    echo "Create a VM"
    qm create $TM_ID --name $TM_NAME --memory 1024 --net0 virtio,bridge=$BRIDGE,tag=$VLAN

    echo "Import the disk in qcow2 format (as unused disk)  and remove the downloaded file"
    qm importdisk $TM_ID $FILE $DATASTORE -format qcow2
    rm -v $FILE

    echo "Attach the disk to the vm using VirtIO SCSI and resize it to 32G"
    qm set $TM_ID --scsihw virtio-scsi-pci --scsi0 $DATASTORE:vm-$TM_ID-disk-0
    qm resize $TM_ID scsi0 +30G

    echo "Add cloud-init drive, boot order, boot disk, serial console and VGA"
    qm set $TM_ID --ide2 local:cloudinit --boot c --bootdisk scsi0 --serial0 socket --vga serial0

    echo "Set the cloud-init config to use DHCP"
    qm set $TM_ID --ipconfig0 ip=dhcp

    echo "Convert to tempalte"
    qm template $TM_ID

    echo "Done the template $TM_NAME with ID $TM_ID is ready to be cloned."
    echo "Enjoy :)"
}

create_template \
    "https://cdimage.debian.org/cdimage/openstack/current-10/debian-10-openstack-amd64.qcow2" \
    902 \
    debian10-cloud-32G \
    local-lvm \
    vmbr0 \
    1