[Formating partion by label] #bash

overlay_partition_format.sh

#!/bin/bash

LABEL="OVERLAY_ROOT"
FSTYPE="ext4"

# Find all devices with the label
DEVICES=($(blkid | grep "LABEL=\"$LABEL\"" | cut -d: -f1))

COUNT=${#DEVICES[@]}

# Check match count
if [ "$COUNT" -eq 0 ]; then
    echo "❌ No partition found with label '$LABEL'."
    exit 1

elif [ "$COUNT" -gt 1 ]; then
    echo "⚠️  More than one partition found with label '$LABEL':"
    for dev in "${DEVICES[@]}"; do
        echo "  - $dev"
    done
    exit 2

else
    DEVICE="${DEVICES[0]}"
    echo "✅ Found exactly one device with label '$LABEL': $DEVICE"

    # Confirm before formatting (optional safety prompt)
    echo "⚠️  WARNING: This will erase all data on $DEVICE"
    read -p "Are you sure you want to format $DEVICE to $FSTYPE? (yes/[no]): " CONFIRM

    if [[ "$CONFIRM" != "y" && "$CONFIRM" != "yes" ]]; then
        echo "❎ Format aborted."
        exit 3
    fi

    # Format the device to ext4
    echo "🔧 Formatting $DEVICE to $FSTYPE..."
    sudo mkfs.ext4 -F -L "$LABEL" "$DEVICE"

    if [ $? -eq 0 ]; then
        echo "✅ Successfully formatted $DEVICE as $FSTYPE with label '$LABEL'."
    else
        echo "❌ Formatting failed."
        exit 4
    fi
fi