From b9bbd4c38e3882bb8feb961ffddef3204742fc4f Mon Sep 17 00:00:00 2001
From: Anton Midyukov <antohami@altlinux.org>
Date: Fri, 23 Apr 2021 22:09:22 +0700
Subject: [PATCH] grub: Add items boot with local drive for grub-pc (iso)

use/grub/localboot, use/grub/sdab similar to use/syslinux/localboot,
use/syslinux/sdab.
---
 features.in/grub/cfg.in/10localboot_bios.cfg | 13 +++++++++++++
 features.in/grub/cfg.in/95sdab_bios.cfg      | 19 +++++++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 features.in/grub/cfg.in/10localboot_bios.cfg
 create mode 100644 features.in/grub/cfg.in/95sdab_bios.cfg

diff --git a/features.in/grub/cfg.in/10localboot_bios.cfg b/features.in/grub/cfg.in/10localboot_bios.cfg
new file mode 100644
index 00000000..1443cfd9
--- /dev/null
+++ b/features.in/grub/cfg.in/10localboot_bios.cfg
@@ -0,0 +1,13 @@
+if [ "$grub_platform" = "pc" ]; then
+  menuentry "Boot from hard drive" {
+    insmod part_msdos
+    insmod chain
+    set oldroot="$root"
+    if [ "$root" = hd0 ]
+    then set root=(hd1)
+    else set root=(hd0)
+    fi
+    chainloader +1
+    set root="$oldroot"
+  }
+fi
diff --git a/features.in/grub/cfg.in/95sdab_bios.cfg b/features.in/grub/cfg.in/95sdab_bios.cfg
new file mode 100644
index 00000000..43b4a6d8
--- /dev/null
+++ b/features.in/grub/cfg.in/95sdab_bios.cfg
@@ -0,0 +1,19 @@
+if [ "$grub_platform" = "pc" ]; then
+  menuentry "Boot from 1st hard/flash drive" {
+    insmod part_msdos
+    insmod chain
+    set oldroot="$root"
+    set root=(hd0)
+    chainloader +1
+    set root="$oldroot"
+  }
+
+  menuentry "Boot from 2st hard/flash drive" {
+    insmod part_msdos
+    insmod chain
+    set oldroot="$root"
+    set root=(hd1)
+    chainloader +1
+    set root="$oldroot"
+  }
+fi