resize-partition.sh

#!/bin/bash
# Partition Resize Script for Windows Dual Boot
# Resizes nvme1n1p3 (Linux) from ~1991GB to 1500GB
# Creates nvme1n1p5 (Windows) with 300GB

set -e

echo "═══════════════════════════════════════════════════════════"
echo "    PARTITION RESIZE SCRIPT FOR WINDOWS DUAL BOOT"
echo "═══════════════════════════════════════════════════════════"
echo ""
echo "This script will:"
echo "  1. Shrink /dev/nvme1n1p3 (Linux) from 1991GB to 1500GB"
echo "  2. Create /dev/nvme1n1p5 (Windows) with 300GB"
echo "  3. Leave space for Windows installation"
echo ""
echo "Current partition layout:"
lsblk -o NAME,SIZE,TYPE,FSTYPE,LABEL /dev/nvme1n1
echo ""
echo "⚠️  WARNING: This operation cannot be undone!"
echo "⚠️  Make sure you have backups of important data!"
echo "⚠️  You must boot from an Arch Linux live USB to run this!"
echo ""
read -p "Do you want to proceed? (yes/no): " confirm

if [ "$confirm" != "yes" ]; then
    echo "Operation cancelled."
    exit 1
fi

echo ""
echo "Step 1: Checking filesystem..."
e2fsck -f /dev/nvme1n1p3

echo ""
echo "Step 2: Shrinking ext4 filesystem to 1500GB..."
resize2fs /dev/nvme1n1p3 1500G

echo ""
echo "Step 3: Shrinking partition to 1500GB..."
parted /dev/nvme1n1 ---pretend-input-tty <<EOF
resizepart 3
1505GB
yes
quit
EOF

echo ""
echo "Step 4: Creating Windows partition (300GB)..."
parted /dev/nvme1n1 mkpart primary ntfs 1505GB 1805GB

echo ""
echo "Step 5: Setting Windows partition type..."
parted /dev/nvme1n1 set 5 msftdata on

echo ""
echo "═══════════════════════════════════════════════════════════"
echo "                  ✓ RESIZE COMPLETE!"
echo "═══════════════════════════════════════════════════════════"
echo ""
echo "Partition layout:"
parted /dev/nvme1n1 print
echo ""
lsblk -o NAME,SIZE,TYPE,FSTYPE,LABEL,MOUNTPOINT /dev/nvme1n1
echo ""
echo "Next steps:"
echo "  1. Reboot and remove the USB"
echo "  2. Boot into your Linux system to verify everything works"
echo "  3. Boot Windows installer USB"
echo "  4. Install Windows to the new partition (~300GB unformatted)"
echo "  5. After Windows installs, boot back to Linux"
echo "  6. Run: sudo update-grub"
echo ""
echo "Press Enter to continue..."
read