From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Renaud=20M=C3=A9trich?= <rmetrich@redhat.com>
Date: Tue, 8 Feb 2022 08:39:11 +0100
Subject: [PATCH] search: new --efidisk-only option on EFI systems
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When using 'search' on EFI systems, we sometimes want to exclude devices
that are not EFI disks (e.g. md, lvm).
This is typically used when wanting to chainload when having a software
raid (md) for EFI partition:
with no option, 'search --file /EFI/redhat/shimx64.efi' sets root envvar
to 'md/boot_efi' which cannot be used for chainloading since there is no
effective EFI device behind.
This commit also refactors handling of --no-floppy option.
Signed-off-by: Renaud Métrich <rmetrich@redhat.com>
[rharwood: apply rmetrich's flags initialization fix]
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
(cherry picked from commit fdd8396f4fa750bbbabd4298f2593942f2b84710)
(cherry picked from commit bea473b58726705bb83a3db88f52d46fdcc6150e)
---
grub-core/commands/search.c | 27 +++++++++++++++++++++++----
grub-core/commands/search_wrap.c | 18 ++++++++++++------
include/grub/search.h | 15 ++++++++++++---
3 files changed, 47 insertions(+), 13 deletions(-)
diff --git a/grub-core/commands/search.c b/grub-core/commands/search.c
index d3180bf66..2036a756b 100644
--- a/grub-core/commands/search.c
+++ b/grub-core/commands/search.c
@@ -47,7 +47,7 @@ struct search_ctx
{
const char *key;
const char *var;
- int no_floppy;
+ enum search_flags flags;
char **hints;
unsigned nhints;
int count;
@@ -62,10 +62,29 @@ iterate_device (const char *name, void *data)
int found = 0;
/* Skip floppy drives when requested. */
- if (ctx->no_floppy &&
+ if (ctx->flags & SEARCH_FLAGS_NO_FLOPPY &&
name[0] == 'f' && name[1] == 'd' && name[2] >= '0' && name[2] <= '9')
return 0;
+ /* Limit to EFI disks when requested. */
+ if (ctx->flags & SEARCH_FLAGS_EFIDISK_ONLY)
+ {
+ grub_device_t dev;
+ dev = grub_device_open (name);
+ if (! dev)
+ {
+ grub_errno = GRUB_ERR_NONE;
+ return 0;
+ }
+ if (! dev->disk || dev->disk->dev->id != GRUB_DISK_DEVICE_EFIDISK_ID)
+ {
+ grub_device_close (dev);
+ grub_errno = GRUB_ERR_NONE;
+ return 0;
+ }
+ grub_device_close (dev);
+ }
+
#ifdef DO_SEARCH_FS_UUID
#define compare_fn grub_strcasecmp
#else
@@ -261,13 +280,13 @@ try (struct search_ctx *ctx)
}
void
-FUNC_NAME (const char *key, const char *var, int no_floppy,
+FUNC_NAME (const char *key, const char *var, enum search_flags flags,
char **hints, unsigned nhints)
{
struct search_ctx ctx = {
.key = key,
.var = var,
- .no_floppy = no_floppy,
+ .flags = flags,
.hints = hints,
.nhints = nhints,
.count = 0,
diff --git a/grub-core/commands/search_wrap.c b/grub-core/commands/search_wrap.c
index 47fc8eb99..0b62acf85 100644
--- a/grub-core/commands/search_wrap.c
+++ b/grub-core/commands/search_wrap.c
@@ -40,6 +40,7 @@ static const struct grub_arg_option options[] =
N_("Set a variable to the first device found."), N_("VARNAME"),
ARG_TYPE_STRING},
{"no-floppy", 'n', 0, N_("Do not probe any floppy drive."), 0, 0},
+ {"efidisk-only", 0, 0, N_("Only probe EFI disks."), 0, 0},
{"hint", 'h', GRUB_ARG_OPTION_REPEATABLE,
N_("First try the device HINT. If HINT ends in comma, "
"also try subpartitions"), N_("HINT"), ARG_TYPE_STRING},
@@ -73,6 +74,7 @@ enum options
SEARCH_FS_UUID,
SEARCH_SET,
SEARCH_NO_FLOPPY,
+ SEARCH_EFIDISK_ONLY,
SEARCH_HINT,
SEARCH_HINT_IEEE1275,
SEARCH_HINT_BIOS,
@@ -89,6 +91,7 @@ grub_cmd_search (grub_extcmd_context_t ctxt, int argc, char **args)
const char *id = 0;
int i = 0, j = 0, nhints = 0;
char **hints = NULL;
+ enum search_flags flags = 0;
if (state[SEARCH_HINT].set)
for (i = 0; state[SEARCH_HINT].args[i]; i++)
@@ -180,15 +183,18 @@ grub_cmd_search (grub_extcmd_context_t ctxt, int argc, char **args)
goto out;
}
+ if (state[SEARCH_NO_FLOPPY].set)
+ flags |= SEARCH_FLAGS_NO_FLOPPY;
+
+ if (state[SEARCH_EFIDISK_ONLY].set)
+ flags |= SEARCH_FLAGS_EFIDISK_ONLY;
+
if (state[SEARCH_LABEL].set)
- grub_search_label (id, var, state[SEARCH_NO_FLOPPY].set,
- hints, nhints);
+ grub_search_label (id, var, flags, hints, nhints);
else if (state[SEARCH_FS_UUID].set)
- grub_search_fs_uuid (id, var, state[SEARCH_NO_FLOPPY].set,
- hints, nhints);
+ grub_search_fs_uuid (id, var, flags, hints, nhints);
else if (state[SEARCH_FILE].set)
- grub_search_fs_file (id, var, state[SEARCH_NO_FLOPPY].set,
- hints, nhints);
+ grub_search_fs_file (id, var, flags, hints, nhints);
else
grub_error (GRUB_ERR_INVALID_COMMAND, "unspecified search type");
diff --git a/include/grub/search.h b/include/grub/search.h
index d80347df3..4190aeb2c 100644
--- a/include/grub/search.h
+++ b/include/grub/search.h
@@ -19,11 +19,20 @@
#ifndef GRUB_SEARCH_HEADER
#define GRUB_SEARCH_HEADER 1
-void grub_search_fs_file (const char *key, const char *var, int no_floppy,
+enum search_flags
+ {
+ SEARCH_FLAGS_NO_FLOPPY = 1,
+ SEARCH_FLAGS_EFIDISK_ONLY = 2
+ };
+
+void grub_search_fs_file (const char *key, const char *var,
+ enum search_flags flags,
char **hints, unsigned nhints);
-void grub_search_fs_uuid (const char *key, const char *var, int no_floppy,
+void grub_search_fs_uuid (const char *key, const char *var,
+ enum search_flags flags,
char **hints, unsigned nhints);
-void grub_search_label (const char *key, const char *var, int no_floppy,
+void grub_search_label (const char *key, const char *var,
+ enum search_flags flags,
char **hints, unsigned nhints);
#endif