Fix LUKS mounting after HDD power loss - "file already exists"

fix_ghost_luks.sh

#!/bin/bash

## Cleans up stale LUKS device mappings.
## Usage: sudo ./fix_ghost_luks.sh

set -e

# Color output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

# Device details
LUKS_UUID="71136d07-e496-4b36-8eb8-e2b9771d80d0"
LUKS_NAME="luks-${LUKS_UUID}"
DM_MAJOR="252"
DM_MINOR="2"
MOUNT_POINT="/media/o/ToshD"

# Check if running with sudo
if [[ $EUID -ne 0 ]]; then
   echo -e "${RED}This script must be run with sudo${NC}"
   echo "Usage: sudo $0"
   exit 1
fi

echo -e "${BLUE}========================================${NC}"
echo -e "${BLUE}  Ghost LUKS Device Cleanup Script${NC}"
echo -e "${BLUE}========================================${NC}"
echo ""
echo "Target device: $LUKS_NAME"
echo "UUID: $LUKS_UUID"
echo "Mount point: $MOUNT_POINT"
echo ""

# Step 1: Check if device mapping exists
echo -e "${YELLOW}[1/5]${NC} Checking for stale device mapping..."
if dmsetup ls 2>/dev/null | grep -q "$LUKS_NAME"; then
    echo -e "      ${GREEN}✓${NC} Found device mapping (${DM_MAJOR}:${DM_MINOR})"

    # Try to unmount first
    if mountpoint -q "$MOUNT_POINT" 2>/dev/null; then
        echo -e "      ${YELLOW}→${NC} Mount point still active, unmounting..."
        if umount -f "$MOUNT_POINT" 2>/dev/null; then
            echo -e "      ${GREEN}✓${NC} Unmounted successfully"
        else
            echo -e "      ${RED}✗${NC} Failed to unmount, trying lazy unmount..."
            umount -l "$MOUNT_POINT" 2>/dev/null || true
        fi
    fi

    # Remove device mapping
    echo -e "      ${YELLOW}→${NC} Removing device mapping..."
    if dmsetup remove "$LUKS_NAME" 2>/dev/null; then
        echo -e "      ${GREEN}✓${NC} Device mapping removed via dmsetup"
    elif cryptsetup close "$LUKS_NAME" 2>/dev/null; then
        echo -e "      ${GREEN}✓${NC} Device closed via cryptsetup"
    else
        echo -e "      ${RED}✗${NC} Failed to remove mapping, trying forced removal..."
        dmsetup remove -f "$LUKS_NAME" 2>/dev/null || true
    fi
else
    echo -e "      ${GREEN}✓${NC} No device mapping found (already clean)"
fi
echo ""

# Step 2: Clean udev database
echo -e "${YELLOW}[2/5]${NC} Clearing udev database entry..."
UDEV_PATH="/run/udev/data/b${DM_MAJOR}:${DM_MINOR}"
if [[ -f "$UDEV_PATH" ]]; then
    echo -e "      ${GREEN}✓${NC} Found udev entry at $UDEV_PATH"
    echo "About to 'rm -f $UDEV_PATH"
    read
    rm -f "$UDEV_PATH"
    echo -e "      ${GREEN}✓${NC} Removed udev database entry"
else
    echo -e "      ${GREEN}✓${NC} No udev entry found (already clean)"
fi
echo ""

# Step 3: Reload udev
echo -e "${YELLOW}[3/5]${NC} Reloading udev rules and triggering..."
udevadm control --reload-rules >/dev/null 2>&1
udevadm trigger >/dev/null 2>&1
echo -e "      ${GREEN}✓${NC} udev reloaded and triggered"
echo ""

# Step 4: Reload systemd
echo -e "${YELLOW}[4/5]${NC} Reloading systemd daemon..."
systemctl daemon-reload >/dev/null 2>&1
echo -e "      ${GREEN}✓${NC} systemd daemon reloaded"
echo ""

# Step 5: Restart udisks2
echo -e "${YELLOW}[5/5]${NC} Restarting udisks2 service..."
if systemctl is-active --quiet udisks2; then
    systemctl restart udisks2 >/dev/null 2>&1
    echo -e "      ${GREEN}✓${NC} udisks2 restarted"
else
    echo -e "      ${YELLOW}→${NC} udisks2 not running, skipping restart"
fi
echo ""

# Verification
echo -e "${BLUE}========================================${NC}"
echo -e "${BLUE}  Verification${NC}"
echo -e "${BLUE}========================================${NC}"
echo ""

# Check 1: Device mapping gone
echo -ne "Device mapping status: "
if ! dmsetup ls 2>/dev/null | grep -q "$LUKS_UUID" 2>/dev/null; then
    echo -e "${GREEN}✓ REMOVED${NC}"
else
    echo -e "${RED}✗ STILL EXISTS${NC}"
fi

# Check 2: udev entry gone
echo -ne "udev database entry: "
if [[ ! -f "$UDEV_PATH" ]]; then
    echo -e "${GREEN}✓ CLEANED${NC}"
else
    echo -e "${RED}✗ STILL EXISTS${NC}"
fi

# Check 3: Symlinks gone
echo -ne "Device mapper symlinks: "
if ! ls /dev/mapper/luks-${LUKS_UUID}* 2>/dev/null | grep -q .; then
    echo -e "${GREEN}✓ REMOVED${NC}"
else
    echo -e "${YELLOW}~ still present (will auto-clean on next mount)${NC}"
fi

# Check 4: Mount point state
echo -ne "Mount point status: "
if ! mountpoint -q "$MOUNT_POINT" 2>/dev/null; then
    echo -e "${GREEN}✓ UNMOUNTED${NC}"
else
    echo -e "${RED}✗ STILL MOUNTED${NC}"
fi

echo ""
echo -e "${GREEN}========================================${NC}"
echo -e "${GREEN}  Cleanup Complete!${NC}"
echo -e "${GREEN}========================================${NC}"
echo ""
echo -e "Next steps:"
echo "  1. Reconnect the ToshD USB drive"
echo "  2. Open file manager (Nautilus)"
echo "  3. It should prompt to unlock the device"
echo "  4. Enter the LUKS passphrase"
echo ""
echo "If you still get errors:"
echo "  - Check kernel logs: sudo dmesg | tail -20"
echo "  - Check udisks2 logs: journalctl -u udisks2 -n 50"
echo "  - Use Disks application for graphical interface"
echo ""