bash script to help unlock/mount/unmount LUKS encrypted drive

manage-luks-drive.sh

#!/bin/bash
# Unified LUKS Drive Management Script
DEVICE="/dev/sdb1"       # Update to your encrypted partition
MAPPER_NAME="myluksdrive" # Must match name used during setup
MOUNT_POINT="/mnt/encrypted" # Update mount path if needed

if [ "$#" -ne 1 ]; then
    echo "Usage: $0 [mount|unmount]"
    exit 1
fi

case "$1" in
    mount)
        # Check if device exists
        if [ ! -b "$DEVICE" ]; then
            echo "Error: Device $DEVICE not found!" >&2
            echo "Use 'lsblk' to find your device and update DEVICE variable" >&2
            exit 1
        fi
        
        # Check if already mounted
        if grep -qs "/dev/mapper/$MAPPER_NAME" /proc/mounts; then
            echo "Error: Drive is already mounted" >&2
            exit 1
        fi
        
        # Unlock drive
        echo "Unlocking $DEVICE..."
        if ! sudo cryptsetup open "$DEVICE" "$MAPPER_NAME"; then
            echo "Error: Failed to unlock device!" >&2
            exit 1
        fi
        
        # Mount drive
        echo "Mounting to $MOUNT_POINT..."
        sudo mkdir -p "$MOUNT_POINT"
        if sudo mount "/dev/mapper/$MAPPER_NAME" "$MOUNT_POINT"; then
            echo "Successfully mounted at $MOUNT_POINT"
        else
            echo "Error: Mounting failed!" >&2
            sudo cryptsetup close "$MAPPER_NAME"
            exit 1
        fi
        ;;
        
    unmount)
        # Check if mounted
        if ! grep -qs "/dev/mapper/$MAPPER_NAME" /proc/mounts; then
            echo "Error: Drive is not currently mounted at $MOUNT_POINT" >&2
            exit 1
        fi
        
        # Unmount drive
        if sudo umount "$MOUNT_POINT"; then
            echo "Unmounted $MOUNT_POINT"
            sudo cryptsetup close "$MAPPER_NAME"
            echo "Drive locked"
        else
            echo "Error: Failed to unmount! (Is something using the drive?)" >&2
            exit 1
        fi
        ;;
        
    *)
        echo "Invalid argument: $1" >&2
        echo "Usage: $0 [mount|unmount]" >&2
        exit 1
        ;;
esac