[PATCH 4/7] efi: add helper to get the GPT partition UUID for a device

[Michael Olbrich]

On Thu, Jul 16, 2015 at 11:34:25AM +0200, Marc Kleine-Budde wrote:
> On 07/16/2015 10:43 AM, Michael Olbrich wrote:
> > Signed-off-by: Michael Olbrich <m.olbrich at pengutronix.de>
> > ---
> >  common/efi-devicepath.c | 31 +++++++++++++++++++++++++++++++
> >  include/efi.h           |  1 +
> >  2 files changed, 32 insertions(+)
> > 
> > diff --git a/common/efi-devicepath.c b/common/efi-devicepath.c
> > index a53c6d2e8b9b..fdb86afc8eca 100644
> > --- a/common/efi-devicepath.c
> > +++ b/common/efi-devicepath.c
> > @@ -1383,3 +1383,34 @@ u8 device_path_to_type(struct efi_device_path *dev_path)
> >  
> >  	return device_path_type(dev_path);
> >  }
> > +
> > +char *device_path_to_partuuid(struct efi_device_path *dev_path)
> > +{
> > +	struct efi_device_path *dev_path_node;
> > +	struct harddrive_device_path *hd;
> > +	char *str = NULL;;
> > +
> > +	dev_path = unpack_device_path(dev_path);
> > +
> > +	for (dev_path_node = dev_path; !is_device_path_end(dev_path_node);
> > +	     dev_path_node = next_device_path_node(dev_path_node)) {
> > +
> > +		if (device_path_type(dev_path_node) != MEDIA_DEVICE_PATH)
> > +			continue;
> > +
> > +		if (dev_path_node->sub_type != MEDIA_HARDDRIVE_DP)
> > +			continue;
> > +
> > +		hd = (struct harddrive_device_path *)dev_path_node;
> > +
> > +		if (hd->signature_type != SIGNATURE_TYPE_GUID)
> > +			continue;
> > +
> > +		str = malloc(sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")+1);
> > +		sprintf(str, "%pU)", (efi_guid_t *)&(hd->signature[0]));
> > +		break;
> asprintf()?

Good idea. And I need to add a OOM check.

Michael

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