From 92005be6d82b275e32bd74d1aabc45461e70db0d Mon Sep 17 00:00:00 2001
From: Robbie Harwood <rharwood@redhat.com>
Date: Fri, 15 Jul 2022 16:13:01 -0400
Subject: kern/fs: The grub_fs_probe() should dprint errors from filesystems

When filesystem detection fails, all that's currently debug-logged is
a series of messages like:

    grub-core/kern/fs.c:56:fs: Detecting ntfs...
    grub-core/kern/fs.c:76:fs: ntfs detection failed.

repeated for each filesystem. Any messages provided to grub_error() by
the filesystem are lost, and one has to break out gdb to figure out what
went wrong.

With this change, one instead sees:

    grub-core/kern/fs.c:56:fs: Detecting fat...
    grub-core/osdep/hostdisk.c:357:hostdisk: reusing open device
    `/path/to/device'
    grub-core/kern/fs.c:77:fs: error: invalid modification timestamp for /.
    grub-core/kern/fs.c:79:fs: fat detection failed.

in the debug prints.

Reference:https://git.savannah.gnu.org/cgit/grub.git/commit?id=92005be6d82b275e32bd74d1aabc45461e70db0d
Conflict:NA

Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/kern/fs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/grub-core/kern/fs.c b/grub-core/kern/fs.c
index e0d7e16..b950829 100644
--- a/grub-core/kern/fs.c
+++ b/grub-core/kern/fs.c
@@ -75,6 +75,8 @@ grub_fs_probe (grub_device_t device)
 	    return p;
 
 	  grub_error_push ();
+	  /* The grub_error_push() does not touch grub_errmsg. */
+	  grub_dprintf ("fs", _("error: %s.\n"), grub_errmsg);
 	  grub_dprintf ("fs", "%s detection failed.\n", p->name);
 	  grub_error_pop ();
 
-- 
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