#!/bin/bash
# This script will delete snapshots that has the correct prefix and old enough date string in it.

# Used to get the age of snapshots to delete.
# This has to be understood by (date --date STRING)
age_to_delete="2 weeks ago"

# The prefix to add and delete
prefix="pve-autosnapshot"

# Script
###################

# Creating the date to compare to.
the_past=$(date +%F_%T -d "$age_to_delete" | grep -o "[0-9]" | tr -d "\n")

# Full Prefix
prefix_search="$(echo -n "${prefix}" | tr "[:cntrl:][:punct:][:space:]" "_")"

# Create snapshots for containers
# Containers dont have snapshot support yet.

# Create snapshots for virtual machines
for vm_id in $(qm list | grep -oE "^[ ]*[0-9]{3}" | tr -d " "); do
        err=false
        for snapshot_id in $(qm listsnapshot "${vm_id}" | cut -d" " -f1 | grep -i "${prefix_search}"); do
                vm_id_time="$(echo "$snapshot_id" | grep -o "[0-9]" | tr -d "\n")"
                re='^-?[0-9]+$'
                if [[ ${vm_id_time} =~ $re ]] ; then
                        if [ ${vm_id_time} -lt ${the_past} ] ; then
                                out_put="$(qm delsnapshot "${vm_id}" "${snapshot_id}" 2>&1)"
                                if [ $? -gt 0 ] && [[ "$out_put" != *"a template"* ]]; then
                                        echo "Error for VM ID: $vm_id SNAP ID: $snapshot_id"
                                        echo -e " Msg:\n  $out_put"
                                        err=true
                                fi

                        fi
                fi
        done
        $err  && echo "-------------------"
done