From b8457f2e271917c5c83a4fee286bafedf8c5790c Mon Sep 17 00:00:00 2001
From: Michael Chang <[email protected]>
Date: Tue, 8 Aug 2023 17:57:24 +0800
Subject: [PATCH] Make grub.cfg compatible to old binaries

The new added fwsetup test in the topmost menu is always executed
regardless older grub may not be able to handle and thus trapped in a
boot loop between grub and fwsetup.

This in particular is to make sure a smooth transition if grub is rolled
back to older release and needs to boot newer snapshots.

Also removing dashes in the UUID that every version released in the wild
can handle.

Signed-off-by: Michael Chang <[email protected]>
---
 util/grub-probe.c               | 20 +++++++++++++++++++-
 util/grub.d/30_uefi-firmware.in | 16 ++++++++++------
 2 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/util/grub-probe.c b/util/grub-probe.c
index e7efcc268..99c738e44 100644
--- a/util/grub-probe.c
+++ b/util/grub-probe.c
@@ -290,8 +290,26 @@ probe_cryptodisk_uuid (grub_disk_t disk, char delim)
     }
   if (disk->dev->id == GRUB_DISK_DEVICE_CRYPTODISK_ID)
     {
+      grub_size_t i, j;
       const char *uu = grub_util_cryptodisk_get_uuid (disk);
-      grub_printf ("%s%c", uu, delim);
+      grub_size_t len = grub_strlen (uu);
+      char *p = grub_malloc (len + 1);
+
+      /* Removing dash in the UUID string
+       * This keeps old grub binary to work with newer config in a system,
+       * especially for snapshots. It is a temporary change to make sure smooth
+       * transition from 2.06 to 2.12-rc1 and this hunk can be removed
+       * after 2.12-rc1 release stablized.
+       */
+      for (i = 0, j = 0; i < len; i++)
+        {
+          if (uu[i] != '-')
+            p[j++] = uu[i];
+        }
+      p[j] = '\0';
+
+      grub_printf ("%s%c", p, delim);
+      grub_free (p);
     }
 }
 
diff --git a/util/grub.d/30_uefi-firmware.in b/util/grub.d/30_uefi-firmware.in
index 1c2365ddb..96ff112e5 100644
--- a/util/grub.d/30_uefi-firmware.in
+++ b/util/grub.d/30_uefi-firmware.in
@@ -32,11 +32,15 @@ gettext_printf "Adding boot menu entry for UEFI Firmware Settings ...\n" >&2
 
 cat << EOF
 if [ "\$grub_platform" = "efi" ]; then
-	fwsetup --is-supported
-	if [ "\$?" = 0 ]; then
-		menuentry '$LABEL' \$menuentry_id_option 'uefi-firmware' {
-			fwsetup
-		}
-	fi
+	menuentry '$LABEL' \$menuentry_id_option 'uefi-firmware' {
+                fwsetup --is-supported
+                if [ "\$?" = 0 ]; then
+                        fwsetup
+                else
+                        echo "Your firmware doesn't support setup menu entry from a boot loader"
+                        echo "Press any key to return ..."
+                        read
+                fi
+        }
 fi
 EOF
-- 
2.41.0