From cd4cf23f92f094f42bcc1aff9500549d313605bf Mon Sep 17 00:00:00 2001
From: Fabrice Quenneville <fabquenneville@gmail.com>
Date: Wed, 29 Apr 2026 11:23:04 -0400
Subject: [PATCH] feat: add update-efi-mirror script for automated efi and grub
 redundancy

---
 scripts/update-efi-mirror.sh | 50 ++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 scripts/update-efi-mirror.sh

diff --git a/scripts/update-efi-mirror.sh b/scripts/update-efi-mirror.sh
new file mode 100644
index 0000000..af0e5a3
--- /dev/null
+++ b/scripts/update-efi-mirror.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+
+# Identify the currently mounted EFI partition and its device
+SOURCE_MOUNT="/boot/efi"
+SOURCE_PART=$(findmnt -no SOURCE "$SOURCE_MOUNT")
+SOURCE_UUID=$(findmnt -no UUID "$SOURCE_MOUNT")
+SOURCE_DISK=$(lsblk -no PKNAME "$SOURCE_PART")
+SOURCE_DISK_PATH="/dev/$SOURCE_DISK"
+
+# Extract the backup UUID from fstab
+BACKUP_UUID=$(grep "^#UUID=" /etc/fstab | grep "/boot/efi" | awk -F'[= ]' '{print $2}')
+
+if [ -z "$BACKUP_UUID" ]; then
+    echo "Error: Backup EFI UUID not found in /etc/fstab"
+    exit 1
+fi
+
+if [ "$SOURCE_UUID" == "$BACKUP_UUID" ]; then
+    echo "Error: Source and Backup UUIDs are identical. Check /etc/fstab."
+    exit 1
+fi
+
+# Identify the physical disk for the backup UUID
+BACKUP_PART=$(blkid -U "$BACKUP_UUID")
+BACKUP_DISK=$(lsblk -no PKNAME "$BACKUP_PART")
+BACKUP_DISK_PATH="/dev/$BACKUP_DISK"
+
+# Define temporary mount point
+TARGET_MOUNT=$(mktemp -d -t efi-sync.XXXXXXXXXX)
+
+# Trap to ensure the directory is removed even if the script fails
+trap 'rm -rf "$TARGET_MOUNT"' EXIT
+
+# Mount, Sync, and Cleanup
+if mount -U "$BACKUP_UUID" "$TARGET_MOUNT"; then
+    echo "Syncing EFI files: $SOURCE_UUID -> $BACKUP_UUID"
+    rsync -aqAX --delete "$SOURCE_MOUNT/" "$TARGET_MOUNT/"
+    umount "$TARGET_MOUNT"
+    echo "EFI Files Sync Complete."
+else
+    echo "Error: Could not mount backup EFI ($BACKUP_UUID)"
+    exit 1
+fi
+
+# Ensure GRUB binary is installed on BOTH physical disks
+echo "Updating GRUB bootloader on both physical disks..."
+grub-install "$SOURCE_DISK_PATH" --recheck > /dev/null 2>&1
+grub-install "$BACKUP_DISK_PATH" --recheck > /dev/null 2>&1
+
+echo "Redundancy Complete: Files synced and GRUB updated on $SOURCE_DISK_PATH and $BACKUP_DISK_PATH."