zsysgc.sh

#!/bin/bash
# Manual zsysctl gc
clear
garbagespace=
kernelscount=
kernelstrim=

check () {
        garbagespace=$(zpool list | awk -F '[% ]+' '/bpool/ {print $8}')
        kernelscount=$(zsysctl show --full | grep -c -C 2 Kernel)
        clear
        echo "Your BPOOL is $garbagespace% full."
        echo "You have $kernelscount Kernel Snapshots"
        echo ""
}

empty () {
        garbagespace=$(zpool list | awk -F '[% ]+' '/bpool/ {print $8}')
        kernelscount=$(zsysctl show --full | grep -c -C 2 Kernel)
        if [[ $garbagespace -gt 50 ]]
        then
        echo "How many snapshots would you like to trim?"
        echo "0 - $kernelscount"
                        while :; do
                        read kernelstrim
                        [[ $kernelstrim =~ ^[0-9]+$ ]] || { echo "Enter a valid number!"; continue; }
                        if ((kernelstrim >= 0 && kernelstrim <= kernelscount)); then
                        break
                        else
                        echo "Number out of range, try again!"
                        fi
                        done
                if [[ $kernelstrim -gt 0 ]]
                then
                clear
                echo ""
                echo "Collecting Garbage"
                echo ""
                zsysctl show --full | grep -C 2 Kernel | grep bpool | tac | grep bpool -m $kernelstrim | awk -F '[_ ]+' '/bpool/ {print $5}'| xargs -n1 zsysctl state remove -s
                echo ""
                echo "Done."
                echo ""
                elif [[ $kernelstrim = 0 ]]
                then
                clear
                echo ""
                echo "Cancelled" >&2
                echo ""
                fi
        else
        clear
        echo "BPOOL is less than 50% full"
        echo "Do you still want to trim snapshots?"
        read trimanswer
                if [[ $trimanswer = yes ]] || [[ $trimanswer = y ]]
                then
                clear
                echo "How many snapshots would you like to trim?"
                echo "0 - $kernelscount"
                                while :; do
                                read kernelstrim
                                [[ $kernelstrim =~ ^[0-9]+$ ]] || { echo "Enter a valid number!"; continue; }
                                if ((kernelstrim >= 0 && kernelstrim <= kernelscount)); then
                                break
                                else
                                echo "Number out of range, try again!"
                                fi
                                done
                        if [[ $kernelstrim -gt 0 ]]
                        then
                        clear
                        echo ""
                        echo "Collecting Garbage"
                        echo ""
                        zsysctl show --full | grep -C 2 Kernel | grep bpool | tac | grep bpool -m $kernelstrim | awk -F '[_ ]+' '/bpool/ {print $5}'| xargs -n1 zsysctl state remove -s
                        echo ""
                        echo "Done."
                        echo ""
                        elif [[ $kernelstrim = 0 ]]
                        then
                        clear
                        echo ""
                        echo "Cancelled"
                        echo ""
                        fi
                fi
        fi
}

while true; do
        options=("Check Garbage" "Empty Garbage" "Quit")

        echo "Choose an option: "
        select opt in "${options[@]}"; do
                case $REPLY in
                        1) check; break ;;
                        2) empty; break ;;
                        3) break 2 ;;
                        *) echo "Invalid Option!" >&2
                esac
        done
done

echo "Have a nice day!"