This patch adds a function to provide partition PARTUUID on MBR
formatted disks by extracting 32-bit disk signature code from MBR
at offset 0x01B8 and adding partition number to it, similarly to
'blkid' output.
Signed-off-by: Vitaly Kuzmichev <vitaly.kuzmic...@rtsoft.de>
---
grub-core/partmap/msdos.c | 32 ++++++++++++++++++++++++++++++++
include/grub/msdos_partition.h | 3 +++
2 files changed, 35 insertions(+)
diff --git a/grub-core/partmap/msdos.c b/grub-core/partmap/msdos.c
index c85bb74be..4ad9ea74f 100644
--- a/grub-core/partmap/msdos.c
+++ b/grub-core/partmap/msdos.c
@@ -24,12 +24,44 @@
#include <grub/misc.h>
#include <grub/dl.h>
#include <grub/i18n.h>
+#include <grub/i386/pc/boot.h>
GRUB_MOD_LICENSE ("GPLv3+");
static struct grub_partition_map grub_msdos_partition_map;
+char *
+grub_mbr_partition_get_uuid (grub_device_t dev)
+{
+ grub_disk_t disk;
+ grub_partition_t pt;
+ grub_uint32_t disk_uuid;
+ char *part_uuid = NULL;
+
+ if (dev && dev->disk && dev->disk->partition &&
dev->disk->partition->partmap)
+ {
+ pt = dev->disk->partition;
+ if (grub_strcmp (pt->partmap->name, "msdos") == 0)
+ {
+ disk = grub_disk_open (dev->disk->name);
+ if (disk && grub_disk_read (disk, 0,
+ GRUB_BOOT_MACHINE_WINDOWS_NT_MAGIC,
+ sizeof (disk_uuid), &disk_uuid) == 0)
+ part_uuid = grub_xasprintf ("%08x-%02x",
+ grub_le_to_cpu32 (disk_uuid),
+ pt->number + 1);
+ if (!part_uuid)
+ grub_error_push ();
+ grub_disk_close (disk);
+ if (!part_uuid)
+ grub_error_pop ();
+ }
+ }
+
+ return part_uuid;
+}
+
#ifdef GRUB_UTIL
#include <grub/emu/misc.h>
diff --git a/include/grub/msdos_partition.h b/include/grub/msdos_partition.h
index fdc2904d3..ff7600915 100644
--- a/include/grub/msdos_partition.h
+++ b/include/grub/msdos_partition.h
@@ -124,4 +124,7 @@ grub_partition_msdos_iterate (grub_disk_t disk,
grub_partition_iterate_hook_t hook,
void *hook_data);
+char *
+grub_mbr_partition_get_uuid (grub_device_t dev);
+
#endif /* ! GRUB_PC_PARTITION_HEADER */
--
2.34.1
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