mounter

#!/usr/bin/env bash


# Daemon tool to mount/unmount drives
# Written by Nathaniel Maia, December 2017

# List of UUIDs
DRIVES=(
        DEBC8E9CBC8E6EB9
       )

#############################################################
#########

# if passed --remove or -r, unmount drives and exit
if [[ "$1" = "-r" ]] || [[ "$1" = "--remove" ]]; then
    for d in ${DRIVES[@]}; do
        NAME=$(awk '{print $1}' <<< $(grep $d <<< $(lsblk -lno NAME,UUID)))
        MNTP=$(awk '{print $2}' <<< $(grep $d <<< $(lsblk -lno UUID,MOUNTPOINT)))
        if [[ "$NAME" ]] && [[ "$MNTP" ]]; then
            udisksctl unmount -b /dev/$NAME
        fi
    done
    # kill existing mounter instances to stop them re-mounting
    PID=$(awk '{print $1}' <<< $(grep 'mounter' <<< $(pgrep -a bash)))
    if [[ "$PID" ]]; then
        kill $PID
    fi
else
    # infinite 'daemon' loop looking for drives
    while true; do
        # improve performance with secondary loop
        # while no new devices are detected sleep 30s
        OLD=$(wc -l <<< $(grep -i 'usb [0-9].*: new' <<< $(dmesg)))
        while [[ "$CUR" ]] && [ $CUR -eq $OLD ]; do
            sleep 30
            CUR=$(wc -l <<< $(grep -i 'usb [0-9].*: new' <<< $(dmesg)))
        done

        # Check for device UUID, if not mounted, mount it
        for d in ${DRIVES[@]}; do
            NAME=$(awk '{print $1}' <<< $(grep $d <<< $(lsblk -lno NAME,UUID)))
            MNTP=$(awk '{print $2}' <<< $(grep $d <<< $(lsblk -lno UUID,MOUNTPOINT)))
            if [[ "$NAME" ]] && ! [[ "$MNTP" ]]; then
                udisksctl mount -b /dev/$NAME
            fi
        done

        # Update CUR
        CUR=$OLD
    done
fi

exit 0