Add some useful pacman hooks

pacman-hooks/README.md

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+# Some useful pacman hooks not included in package
+
+See `README.md` in each directory for more info.

pacman-hooks/sync-boot-to-efi/README.md

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+# Sync required contents from /boot to /efi
+
+Sync required contents to boot RaspberryPi 4B in UEFI mode from `/boot` to `/efi`
+
+This should help people who mount ESP on `/efi`, but you can always adjust them to meet your needs.
+
+## Usage
+
+1. Disable hooks provided by `uefi-raspberrypi4` package
+
+    You can run those commands to achive that:
+    ```bash
+    ln -s /dev/null /etc/pacman.d/hooks/70-post-install-uefi.hook
+    ln -s /dev/null /etc/pacman.d/hooks/80-pre-remove-uefi.hook
+    ```
+
+2. Put [hooks](./hooks) and [scripts](./scripts) into `/etc/pacman.d`.
+
+## FAQ
+
+- Why not ship those in `uefi-raspberrypi4` package?
+
+    Most people mount ESP on `/boot`, thus files required during boot have already been taken well care of.
+

pacman-hooks/sync-boot-to-efi/hooks/74-sync-boot-to-efi.hook

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+[Trigger]
+Operation = Install
+Operation = Upgrade
+Type = Path
+Target = boot/overlays/
+Target = boot/*.elf
+Target = boot/bootcode.bin
+Target = boot/config.txt
+Target = boot/*.dat
+Target = boot/dtbs/broadcom/bcm2711-rpi-4-b.dtb
+Target = boot/RPI_EFI.fd
+
+[Action]
+Description = Syncing required files in /boot to /efi...
+Depends = coreutils
+When = PostTransaction
+Exec = /etc/pacman.d/scripts/sync-boot-to-efi
+NeedsTargets

pacman-hooks/sync-boot-to-efi/scripts/sync-boot-to-efi

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+#!/usr/bin/env bash
+
+declare -r target=efi
+while read -r path
+do
+    if [ -n "$path" ]
+    then
+        target_path=$target/$(basename "$path")
+        echo "Syncing $path to $target_path..."
+        case "$path" in
+            *config.txt|*RPI_EFI.fd)
+                echo "We are syncing $path to $target_path.pacnew to prevent conflicts, you need to merge them manually."
+                cp "$path" "$target_path.pacnew"
+                ;;
+            *)
+                cp "$path" "$target_path"
+                ;;
+        esac
+    fi
+done