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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Nicholas Vinson <nvinson234@gmail.com>
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Date: Mon, 16 Apr 2018 22:36:25 -0700
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Subject: [PATCH] grub-probe: Add PARTUUID detection support
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Add PARTUUID detection support grub-probe for MBR and GPT partition schemes.
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Signed-off-by: Nicholas Vinson <nvinson234@gmail.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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util/grub-probe.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 48 insertions(+)
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diff --git a/util/grub-probe.c b/util/grub-probe.c
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index 21cb80fbe15..e45dbf9e049 100644
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--- a/util/grub-probe.c
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+++ b/util/grub-probe.c
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@@ -28,6 +28,7 @@
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#include <grub/partition.h>
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#include <grub/msdos_partition.h>
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#include <grub/gpt_partition.h>
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+#include <grub/i386/pc/boot.h>
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#include <grub/emu/hostdisk.h>
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#include <grub/emu/getroot.h>
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#include <grub/term.h>
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@@ -62,6 +63,7 @@ enum {
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PRINT_DRIVE,
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PRINT_DEVICE,
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PRINT_PARTMAP,
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+ PRINT_PARTUUID,
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PRINT_ABSTRACTION,
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PRINT_CRYPTODISK_UUID,
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PRINT_HINT_STR,
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@@ -85,6 +87,7 @@ static const char *targets[] =
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[PRINT_DRIVE] = "drive",
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[PRINT_DEVICE] = "device",
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[PRINT_PARTMAP] = "partmap",
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+ [PRINT_PARTUUID] = "partuuid",
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[PRINT_ABSTRACTION] = "abstraction",
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[PRINT_CRYPTODISK_UUID] = "cryptodisk_uuid",
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[PRINT_HINT_STR] = "hints_string",
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@@ -181,6 +184,45 @@ probe_partmap (grub_disk_t disk, char delim)
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}
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}
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+static void
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+probe_partuuid (grub_disk_t disk, char delim)
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+{
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+ grub_partition_t p = disk->partition;
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+
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+ /*
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+ * Nested partitions not supported for now.
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+ * Non-nested partitions must have disk->partition->parent == NULL
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+ */
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+ if (p && p->parent == NULL)
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+ {
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+ disk->partition = p->parent;
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+
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+ if (strcmp(p->partmap->name, "msdos") == 0)
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+ {
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+ /*
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+ * The partition GUID for MSDOS is the partition number (starting
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+ * with 1) prepended with the NT disk signature.
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+ */
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+ grub_uint32_t nt_disk_sig;
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+
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+ if (grub_disk_read (disk, 0, GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC,
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+ sizeof(nt_disk_sig), &nt_disk_sig) == 0)
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+ grub_printf ("%08x-%02x",
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+ grub_le_to_cpu32(nt_disk_sig), 1 + p->number);
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+ }
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+ else if (strcmp(p->partmap->name, "gpt") == 0)
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+ {
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+ struct grub_gpt_partentry gptdata;
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+
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+ if (grub_disk_read (disk, p->offset, p->index,
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+ sizeof(gptdata), &gptdata) == 0)
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+ print_gpt_guid(gptdata.guid);
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+ }
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+
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+ disk->partition = p;
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+ }
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+}
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+
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static void
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probe_cryptodisk_uuid (grub_disk_t disk, char delim)
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{
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@@ -635,6 +677,12 @@ probe (const char *path, char **device_names, char delim)
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/* Check if dev->disk itself is contained in a partmap. */
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probe_partmap (dev->disk, delim);
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+ else if (print == PRINT_PARTUUID)
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+ {
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+ probe_partuuid (dev->disk, delim);
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+ putchar (delim);
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+ }
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+
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else if (print == PRINT_MSDOS_PARTTYPE)
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{
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if (dev->disk->partition
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