From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Fri, 29 Jul 2022 15:56:00 -0400
Subject: [PATCH] Make debug=file show which file filters get run.

If one of the file filters breaks things, it's hard to figure out where
it has happened.

This makes grub log which filter is being run, which makes it easier to
figure out where you are in the sequence of events.

Signed-off-by: Peter Jones <pjones@redhat.com>
(cherry picked from commit d3d6518a13b5440a3be6c66b0ae47447182f2891)
---
 grub-core/kern/file.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/grub-core/kern/file.c b/grub-core/kern/file.c
index ed69fc0f0f..3f175630ea 100644
--- a/grub-core/kern/file.c
+++ b/grub-core/kern/file.c
@@ -30,6 +30,14 @@ void (*EXPORT_VAR (grub_grubnet_fini)) (void);
 
 grub_file_filter_t grub_file_filters[GRUB_FILE_FILTER_MAX];
 
+static char *filter_names[] = {
+    [GRUB_FILE_FILTER_VERIFY] = "GRUB_FILE_FILTER_VERIFY",
+    [GRUB_FILE_FILTER_GZIO] = "GRUB_FILE_FILTER_GZIO",
+    [GRUB_FILE_FILTER_XZIO] = "GRUB_FILE_FILTER_XZIO",
+    [GRUB_FILE_FILTER_LZOPIO] = "GRUB_FILE_FILTER_LZOPIO",
+    [GRUB_FILE_FILTER_MAX] = "GRUB_FILE_FILTER_MAX"
+};
+
 /* Get the device part of the filename NAME. It is enclosed by parentheses.  */
 char *
 grub_file_get_device_name (const char *name)
@@ -121,6 +129,9 @@ grub_file_open (const char *name, enum grub_file_type type)
     if (grub_file_filters[filter])
       {
 	last_file = file;
+	if (filter < GRUB_FILE_FILTER_MAX)
+	  grub_dprintf ("file", "Running %s file filter\n",
+			filter_names[filter]);
 	file = grub_file_filters[filter] (file, type);
 	if (file && file != last_file)
 	  {