From 522c23ccb6cb36e045446f27bc2734e29ba33946 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Wed, 8 Mar 2023 14:12:51 +0100
Subject: [GRUB] Add localboot grub builder

---
 grub_localboot/.gitignore |  1 +
 grub_localboot/boot.cfg   | 39 +++++++++++++++++++++++++++++++++++++++
 grub_localboot/make.sh    |  4 ++++
 3 files changed, 44 insertions(+)
 create mode 100644 grub_localboot/.gitignore
 create mode 100644 grub_localboot/boot.cfg
 create mode 100755 grub_localboot/make.sh

diff --git a/grub_localboot/.gitignore b/grub_localboot/.gitignore
new file mode 100644
index 0000000..ada5e8e
--- /dev/null
+++ b/grub_localboot/.gitignore
@@ -0,0 +1 @@
+grub-boot.img
diff --git a/grub_localboot/boot.cfg b/grub_localboot/boot.cfg
new file mode 100644
index 0000000..f26b137
--- /dev/null
+++ b/grub_localboot/boot.cfg
@@ -0,0 +1,39 @@
+insmod part_gpt
+insmod fat
+insmod chain
+#insmod part_msdos
+#insmod ext2
+
+echo
+echo "Scanning, first pass..."
+list_env
+echo "eins: '${1}' oder '$1'"
+set
+sleep 10
+#for efi in (*,gpt*)/efi/*/grub.cfg (*,gpt*)/efi/*/*/grub.cfg (*,gpt*)/grub.cfg (*,gpt*)/*/grub.cfg (*,gpt*)/efi/grub/grubx64.efi (*,gpt*)/efi/boot/bootx64.efi (*,gpt*)/efi/*/*/bootmgfw.efi (*,gpt*)/efi/*/*.efi ; do
+for efi in (*,gpt*)/efi/grub/grubx64.efi (*,gpt*)/efi/boot/bootx64.efi (*,gpt*)/efi/*/*/bootmgfw.efi (*,gpt*)/efi/*/*.efi \
+		(*,msdos*)/efi/grub/grubx64.efi (*,msdos*)/efi/boot/bootx64.efi (*,msdos*)/efi/*/*/bootmgfw.efi (*,msdos*)/efi/*/*.efi; do
+	regexp --set=1:efi_device '^\((.*)\)/' "${efi}"
+done
+
+echo "Scanning, second pass..."
+for efi in (*,gpt*)/efi/grub/grubx64.efi (*,gpt*)/efi/boot/bootx64.efi (*,gpt*)/efi/*/*/bootmgfw.efi (*,gpt*)/efi/*/*.efi \
+		(*,msdos*)/efi/grub/grubx64.efi (*,msdos*)/efi/boot/bootx64.efi (*,msdos*)/efi/*/*/bootmgfw.efi (*,msdos*)/efi/*/*.efi; do
+	if [ -e "${efi}" ]; then
+		#regexp --set=1:efi_device '^\((.*)\)/' "${efi}"
+		regexp --set=1:root '^(\(.*\))/' "${efi}"
+		regexp --set=1:efi_path '^\(.*\)(/.*)$' "${efi}"
+		echo " >> Found operating system! <<"
+		echo " Path: '${efi}' on '${root}'"
+		echo " Fallback '${efi_path}'"
+		echo " Booting in 5s..."
+		sleep --interruptible --verbose 5
+		chainloader "${efi}"
+		boot
+		echo " That failed..."
+	fi
+done
+
+echo "No EFI known OS found. Reboot."
+sleep --interruptible --verbose 15
+reboot
diff --git a/grub_localboot/make.sh b/grub_localboot/make.sh
new file mode 100755
index 0000000..d48a593
--- /dev/null
+++ b/grub_localboot/make.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# apt install --no-install-recommends grub-efi-amd64-bin
+grub-mkstandalone -O x86_64-efi -o grub-boot.img "boot/grub/grub.cfg=boot.cfg"
-- 
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