boot-from-uuid-fix

#!/bin/bash

# Check if /boot is already using UUID
existing_boot_uuid=$(grep '/boot' /etc/fstab | grep '^UUID')
if [ -n "$existing_boot_uuid" ]; then
  echo "The /boot partition is already using a UUID:"
  echo "$existing_boot_uuid"
  echo "Everything is fine, no changes are needed."
  exit 0
fi

# Function to select a /boot device
choose_boot_partition() {
  echo "Available devices mounted as /boot (excluding UUIDs):"
  boot_partitions=$(grep '/boot' /etc/fstab | grep -v '^UUID' | awk '{print $1}')
  if [ -z "$boot_partitions" ]; then
    echo "No devices mounted as /boot that require modification were found."
    exit 1
  fi

  echo "$boot_partitions" | nl -w2 -s'. '
  echo
  read -p "Select the number of the device you want to modify: " choice

  DEVICE=$(echo "$boot_partitions" | sed -n "${choice}p")
  if [ -z "$DEVICE" ]; then
    echo "Invalid selection. Exiting."
    exit 1
  fi
}

# Select the device for /boot
choose_boot_partition

# Get the UUID for the selected device
UUID=$(blkid -s UUID -o value $DEVICE)

# Check if the UUID was found
if [ -z "$UUID" ]; then
  echo "Error: UUID for $DEVICE not found."
  exit 1
fi

# Create a backup of fstab with a timestamp
timestamp=$(date +"%Y%m%d_%H%M%S")
cp /etc/fstab /etc/fstab.bak_$timestamp
echo "A backup of /etc/fstab has been created as /etc/fstab.bak_$timestamp"

# Replace the device in /etc/fstab with the UUID
sed -i "s|^$DEVICE|UUID=$UUID|g" /etc/fstab

echo "The entry in /etc/fstab for $DEVICE has been successfully changed to use UUID=$UUID"