Complete rewrite: Single working LVM block-level backup script
- Removed 40+ broken/messy scripts, moved to old_scripts/ - Created lvm_block_backup.sh - proper block-level LVM snapshot backup - Uses dd for block-level cloning instead of file-level rsync - Successfully tested: 462GB backup in 33 minutes - Creates exact, bootable clone of internal drive to external drive - Proper LVM snapshot management with cleanup - Clear documentation in README_BACKUP.md - Clean, minimal solution that actually works
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root
138
old_scripts/fix_grub_lvm_boot.sh
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138
old_scripts/fix_grub_lvm_boot.sh
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#!/bin/bash
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# Fix GRUB Boot for LVM System - External M.2
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# This script fixes GRUB configuration to boot from the external LVM system instead of internal drive
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set -e
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LOG_FILE="/tmp/grub_fix_$(date +%Y%m%d_%H%M%S).log"
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EXTERNAL_ROOT="/tmp/external-root"
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EXTERNAL_BOOT="/tmp/external-boot"
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echo "🔧 GRUB LVM Boot Fix - Starting at $(date)" | tee "$LOG_FILE"
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echo "==========================================" | tee -a "$LOG_FILE"
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# Function to cleanup mounts on exit
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cleanup() {
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echo "🧹 Cleaning up mounts..." | tee -a "$LOG_FILE"
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sudo umount "$EXTERNAL_ROOT/proc" 2>/dev/null || true
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sudo umount "$EXTERNAL_ROOT/sys" 2>/dev/null || true
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sudo umount "$EXTERNAL_ROOT/dev/pts" 2>/dev/null || true
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sudo umount "$EXTERNAL_ROOT/dev" 2>/dev/null || true
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sudo umount "$EXTERNAL_ROOT/boot" 2>/dev/null || true
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sudo umount "$EXTERNAL_ROOT" 2>/dev/null || true
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sudo umount "$EXTERNAL_BOOT" 2>/dev/null || true
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sudo rmdir "$EXTERNAL_ROOT" "$EXTERNAL_BOOT" 2>/dev/null || true
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}
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trap cleanup EXIT
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# Check if LVM is active
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echo "📋 Checking LVM status..." | tee -a "$LOG_FILE"
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if ! sudo lvs system-vg/root &>/dev/null; then
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echo "❌ LVM system-vg/root not found. Please ensure the external M.2 is connected." | tee -a "$LOG_FILE"
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exit 1
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fi
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# Create mount points
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sudo mkdir -p "$EXTERNAL_ROOT" "$EXTERNAL_BOOT"
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# Mount the external LVM system
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echo "💾 Mounting external LVM system..." | tee -a "$LOG_FILE"
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sudo mount /dev/system-vg/root "$EXTERNAL_ROOT" | tee -a "$LOG_FILE"
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sudo mount /dev/system-vg/boot "$EXTERNAL_ROOT/boot" | tee -a "$LOG_FILE"
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# Bind mount system directories for chroot
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echo "🔗 Setting up chroot environment..." | tee -a "$LOG_FILE"
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sudo mount --bind /proc "$EXTERNAL_ROOT/proc"
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sudo mount --bind /sys "$EXTERNAL_ROOT/sys"
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sudo mount --bind /dev "$EXTERNAL_ROOT/dev"
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sudo mount --bind /dev/pts "$EXTERNAL_ROOT/dev/pts"
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# Show current GRUB configuration issue
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echo "🔍 Current GRUB issue:" | tee -a "$LOG_FILE"
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if sudo mount /dev/system-vg/boot "$EXTERNAL_BOOT" 2>/dev/null; then
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WRONG_ENTRIES=$(sudo grep -c "nvme0n1p1" "$EXTERNAL_BOOT/grub/grub.cfg" 2>/dev/null || echo "0")
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echo " - Found $WRONG_ENTRIES entries pointing to internal drive (nvme0n1p1)" | tee -a "$LOG_FILE"
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sudo umount "$EXTERNAL_BOOT"
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fi
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# Get the correct UUID for the LVM root
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ROOT_UUID=$(sudo blkid /dev/system-vg/root | grep -o 'UUID="[^"]*"' | cut -d'"' -f2)
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echo " - External LVM root UUID: $ROOT_UUID" | tee -a "$LOG_FILE"
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# Update GRUB configuration from within the external system
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echo "🔄 Regenerating GRUB configuration..." | tee -a "$LOG_FILE"
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# First, ensure EFI partition is mounted in the chroot
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EFI_PARTITION=$(lsblk -rno MOUNTPOINT,FSTYPE | grep vfat | head -1 | cut -d' ' -f1)
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if [ -n "$EFI_PARTITION" ]; then
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echo "📁 Mounting EFI partition: $EFI_PARTITION" | tee -a "$LOG_FILE"
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sudo mkdir -p "$EXTERNAL_ROOT/boot/efi"
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sudo mount "$EFI_PARTITION" "$EXTERNAL_ROOT/boot/efi" || true
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fi
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# Update fstab to reflect LVM UUIDs
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echo "📝 Updating /etc/fstab with correct UUIDs..." | tee -a "$LOG_FILE"
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sudo chroot "$EXTERNAL_ROOT" bash -c "
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# Get UUIDs for all LVM volumes
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ROOT_UUID=\$(blkid /dev/system-vg/root | grep -o 'UUID=\"[^\"]*\"' | cut -d'\"' -f2)
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BOOT_UUID=\$(blkid /dev/system-vg/boot | grep -o 'UUID=\"[^\"]*\"' | cut -d'\"' -f2)
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HOME_UUID=\$(blkid /dev/system-vg/home | grep -o 'UUID=\"[^\"]*\"' | cut -d'\"' -f2)
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SWAP_UUID=\$(blkid /dev/system-vg/swap | grep -o 'UUID=\"[^\"]*\"' | cut -d'\"' -f2)
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# Backup original fstab
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cp /etc/fstab /etc/fstab.backup
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# Create new fstab with LVM UUIDs
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cat > /etc/fstab << EOF
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# LVM-based fstab generated by fix_grub_lvm_boot.sh
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UUID=\${ROOT_UUID} / ext4 errors=remount-ro 0 1
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UUID=\${BOOT_UUID} /boot ext4 defaults 0 2
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UUID=\${HOME_UUID} /home ext4 defaults 0 2
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UUID=\${SWAP_UUID} none swap sw 0 0
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# EFI System Partition
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/dev/disk/by-label/SYSTEM-EFI /boot/efi vfat umask=0077 0 1
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EOF
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echo '✅ Updated /etc/fstab with LVM UUIDs'
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"
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# Install GRUB to EFI
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echo "🛠️ Installing GRUB to EFI..." | tee -a "$LOG_FILE"
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sudo chroot "$EXTERNAL_ROOT" bash -c "
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grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=ubuntu-lvm --recheck 2>&1
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echo '✅ GRUB installed to EFI'
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"
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# Update GRUB configuration
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echo "📝 Updating GRUB configuration..." | tee -a "$LOG_FILE"
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sudo chroot "$EXTERNAL_ROOT" bash -c "
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update-grub 2>&1
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echo '✅ GRUB configuration updated'
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"
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# Verify the fix
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echo "✅ Verifying GRUB fix..." | tee -a "$LOG_FILE"
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sudo mount /dev/system-vg/boot "$EXTERNAL_BOOT"
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NEW_ENTRIES=$(sudo grep -c "system-vg-root" "$EXTERNAL_BOOT/grub/grub.cfg" 2>/dev/null || echo "0")
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OLD_ENTRIES=$(sudo grep -c "nvme0n1p1" "$EXTERNAL_BOOT/grub/grub.cfg" 2>/dev/null || echo "0")
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echo " - LVM entries found: $NEW_ENTRIES" | tee -a "$LOG_FILE"
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echo " - Internal drive entries: $OLD_ENTRIES" | tee -a "$LOG_FILE"
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if [ "$NEW_ENTRIES" -gt 0 ]; then
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echo "✅ SUCCESS: GRUB now configured to boot from external LVM system!" | tee -a "$LOG_FILE"
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echo "" | tee -a "$LOG_FILE"
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echo "🚀 Next steps:" | tee -a "$LOG_FILE"
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echo " 1. Reboot your system" | tee -a "$LOG_FILE"
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echo " 2. In GRUB menu, select 'ubuntu-lvm' or Ubuntu entries" | tee -a "$LOG_FILE"
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echo " 3. System should now boot from external M.2 LVM" | tee -a "$LOG_FILE"
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echo "" | tee -a "$LOG_FILE"
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echo "📋 Log saved to: $LOG_FILE"
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else
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echo "⚠️ Warning: No LVM entries found in new GRUB config. Manual check required." | tee -a "$LOG_FILE"
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echo " Check $LOG_FILE for details."
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fi
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echo "" | tee -a "$LOG_FILE"
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echo "🔧 GRUB LVM Boot Fix completed at $(date)" | tee -a "$LOG_FILE"
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