grub: Add file with cloud helping stuff

This file will detect whether to do certain actions depending on the
environment it is running on.

Currently this detects whether IPFire is booting up on AWS EC2 and
selects the serial console boot entry.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>

config/grub2/00_cloud

@@ -0,0 +1,26 @@
+#!/bin/sh
+# This is an IPFire helper script for GRUB to enable the serial console
+# on AWS instances at the time of the first boost
+
+set -e
+
+# Do nothing if first boot isn't enabled
+if [ "${GRUB_FIRST_BOOT}" != "true" ]; then
+	exit 0
+fi
+
+. "${pkgdatadir}/grub-mkconfig_lib"
+
+if [ -z "${boot_device_id}" ]; then
+	boot_device_id="$(grub_get_device_id "${GRUB_DEVICE}")"
+fi
+
+cat <<EOF
+# Read the system manufacturer string from the BIOS
+smbios --type 1 --get-string 4 --set system_manufacturer
+
+# Are we on Amazon EC2?
+if [ "\$system_manufacturer" = "Amazon EC2" ]; then
+	next_entry=gnulinux-serial-${boot_device_id}
+fi
+EOF

config/rootfiles/common/aarch64/grub

@@ -4,6 +4,7 @@ boot/grub/splash.png
 #etc/bash_completion.d/grub
 etc/default/grub
 #etc/grub.d
+etc/grub.d/00_cloud
 etc/grub.d/00_header
 etc/grub.d/10_linux
 etc/grub.d/20_linux_xen

config/rootfiles/common/i586/grub

@@ -5,6 +5,7 @@ boot/grub/splash.png
 #etc/bash_completion.d/grub
 etc/default/grub
 #etc/grub.d
+etc/grub.d/00_cloud
 etc/grub.d/00_header
 etc/grub.d/10_linux
 etc/grub.d/20_linux_xen

config/rootfiles/common/x86_64/grub

@@ -5,6 +5,7 @@ boot/grub/splash.png
 #etc/bash_completion.d/grub
 etc/default/grub
 #etc/grub.d
+etc/grub.d/00_cloud
 etc/grub.d/00_header
 etc/grub.d/10_linux
 etc/grub.d/20_linux_xen

lfs/grub

@@ -125,6 +125,10 @@ ifeq "$(BUILD_PC)" "1"
 	touch /boot/grub/grub.cfg
 endif
 
+	# Install our own helpers
+	install -v -m 644 $(DIR_SRC)/config/grub2/00_cloud \
+		/etc/grub.cfg
+
 	# Install background image
 	-mkdir -pv /boot/grub
 	install -m 644 $(DIR_SRC)/config/grub2/splash.png /boot/grub/splash.png