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gpt: add search by partition label and uuid commands

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Builds on the existing filesystem search code. Only for GPT right now.
This commit is contained in:
Michael Marineau 2014-11-27 16:34:21 -08:00
parent 9c61d9bc2c
commit c70627bc9f
10 changed files with 251 additions and 0 deletions
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64
grub-core/lib/gpt.c
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@ -18,7 +18,9 @@
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/charset.h>
#include <grub/crypto.h>
#include <grub/device.h>
#include <grub/disk.h>
#include <grub/misc.h>
#include <grub/mm.h>
@ -44,6 +46,68 @@ grub_gpt_guid_to_str (grub_gpt_guid_t *guid)
guid->data4[6], guid->data4[7]);
}
static grub_err_t
grub_gpt_device_partentry (grub_device_t device,
struct grub_gpt_partentry *entry)
{
grub_disk_t disk = device->disk;
grub_partition_t p;
grub_err_t err;
if (!disk || !disk->partition)
return grub_error (GRUB_ERR_BUG, "not a partition");
if (grub_strcmp (disk->partition->partmap->name, "gpt"))
return grub_error (GRUB_ERR_BAD_ARGUMENT, "not a GPT partition");
p = disk->partition;
disk->partition = p->parent;
err = grub_disk_read (disk, p->offset, p->index, sizeof (*entry), entry);
disk->partition = p;
return err;
}
grub_err_t
grub_gpt_part_label (grub_device_t device, char **label)
{
struct grub_gpt_partentry entry;
const grub_size_t name_len = ARRAY_SIZE (entry.name);
const grub_size_t label_len = name_len * GRUB_MAX_UTF8_PER_UTF16 + 1;
grub_size_t i;
grub_uint8_t *end;
if (grub_gpt_device_partentry (device, &entry))
return grub_errno;
*label = grub_malloc (label_len);
if (!*label)
return grub_errno;
for (i = 0; i < name_len; i++)
entry.name[i] = grub_le_to_cpu16 (entry.name[i]);
end = grub_utf16_to_utf8 ((grub_uint8_t *) *label, entry.name, name_len);
*end = '\0';
return GRUB_ERR_NONE;
}
grub_err_t
grub_gpt_part_uuid (grub_device_t device, char **uuid)
{
struct grub_gpt_partentry entry;
if (grub_gpt_device_partentry (device, &entry))
return grub_errno;
*uuid = grub_gpt_guid_to_str (&entry.guid);
if (!*uuid)
return grub_errno;
return GRUB_ERR_NONE;
}
static grub_uint64_t
grub_gpt_size_to_sectors (grub_gpt_t gpt, grub_size_t size)
{