util-linux/misc-utils/lsblk-properties.c

#include <blkid.h>

#ifdef HAVE_LIBUDEV
# include <libudev.h>
#endif

#include "c.h"
#include "xalloc.h"
#include "mangle.h"

#include "lsblk.h"

#ifdef HAVE_LIBUDEV
static struct udev *udev;
#endif

void lsblk_device_free_properties(struct lsblk_devprop *p)
{
	if (!p)
		return;

	free(p->fstype);
	free(p->uuid);
	free(p->ptuuid);
	free(p->pttype);
	free(p->label);
	free(p->parttype);
	free(p->partuuid);
	free(p->partlabel);
	free(p->wwn);
	free(p->serial);
	free(p->model);

	free(p);
}

#ifndef HAVE_LIBUDEV
static struct lsblk_devprop *get_properties_by_udev(struct lsblk_device *dev
				__attribute__((__unused__)))
{
	return NULL;
}
#else
static struct lsblk_devprop *get_properties_by_udev(struct lsblk_device *ld)
{
	struct udev_device *dev;

	if (ld->udev_requested)
		return ld->properties;

	if (lsblk->sysroot)
		goto done;
	if (!udev)
		udev = udev_new();	/* global handler */
	if (!udev)
		goto done;

	dev = udev_device_new_from_subsystem_sysname(udev, "block", ld->name);
	if (dev) {
		const char *data;
		struct lsblk_devprop *prop;

		if (ld->properties)
			lsblk_device_free_properties(ld->properties);
		prop = ld->properties = xcalloc(1, sizeof(*ld->properties));

		if ((data = udev_device_get_property_value(dev, "ID_FS_LABEL_ENC"))) {
			prop->label = xstrdup(data);
			unhexmangle_string(prop->label);
		}
		if ((data = udev_device_get_property_value(dev, "ID_FS_UUID_ENC"))) {
			prop->uuid = xstrdup(data);
			unhexmangle_string(prop->uuid);
		}
		if ((data = udev_device_get_property_value(dev, "ID_PART_TABLE_UUID")))
			prop->ptuuid = xstrdup(data);
		if ((data = udev_device_get_property_value(dev, "ID_PART_TABLE_TYPE")))
			prop->pttype = xstrdup(data);
		if ((data = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME"))) {
			prop->partlabel = xstrdup(data);
			unhexmangle_string(prop->partlabel);
		}
		if ((data = udev_device_get_property_value(dev, "ID_FS_TYPE")))
			prop->fstype = xstrdup(data);
		if ((data = udev_device_get_property_value(dev, "ID_PART_ENTRY_TYPE")))
			prop->parttype = xstrdup(data);
		if ((data = udev_device_get_property_value(dev, "ID_PART_ENTRY_UUID")))
			prop->partuuid = xstrdup(data);
		if ((data = udev_device_get_property_value(dev, "ID_PART_ENTRY_FLAGS")))
			prop->partflags = xstrdup(data);

		data = udev_device_get_property_value(dev, "ID_WWN_WITH_EXTENSION");
		if (!data)
			data = udev_device_get_property_value(dev, "ID_WWN");
		if (data)
			prop->wwn = xstrdup(data);

		data = udev_device_get_property_value(dev, "ID_SCSI_SERIAL");
		if(!data)
			data = udev_device_get_property_value(dev, "ID_SERIAL_SHORT");
		if (data)
			prop->serial = xstrdup(data);

		if ((data = udev_device_get_property_value(dev, "ID_MODEL")))
			prop->model = xstrdup(data);

		udev_device_unref(dev);
		DBG(DEV, ul_debugobj(ld, "%s: found udev properties", ld->name));
	}

done:
	ld->udev_requested = 1;
	return ld->properties;
}
#endif /* HAVE_LIBUDEV */

static struct lsblk_devprop *get_properties_by_blkid(struct lsblk_device *dev)
{
	blkid_probe pr = NULL;

	if (dev->blkid_requested)
		return dev->properties;

	if (!dev->size)
		goto done;
	if (getuid() != 0)
		goto done;;				/* no permissions to read from the device */

	pr = blkid_new_probe_from_filename(dev->filename);
	if (!pr)
		goto done;

	blkid_probe_enable_superblocks(pr, 1);
	blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_LABEL |
					      BLKID_SUBLKS_UUID |
					      BLKID_SUBLKS_TYPE);
	blkid_probe_enable_partitions(pr, 1);
	blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);

	if (!blkid_do_safeprobe(pr)) {
		const char *data = NULL;
		struct lsblk_devprop *prop;

		if (dev->properties)
			lsblk_device_free_properties(dev->properties);
		prop = dev->properties = xcalloc(1, sizeof(*dev->properties));

		if (!blkid_probe_lookup_value(pr, "TYPE", &data, NULL))
			prop->fstype = xstrdup(data);
		if (!blkid_probe_lookup_value(pr, "UUID", &data, NULL))
			prop->uuid = xstrdup(data);
		if (!blkid_probe_lookup_value(pr, "PTUUID", &data, NULL))
			prop->ptuuid = xstrdup(data);
		if (!blkid_probe_lookup_value(pr, "PTTYPE", &data, NULL))
			prop->pttype = xstrdup(data);
		if (!blkid_probe_lookup_value(pr, "LABEL", &data, NULL))
			prop->label = xstrdup(data);
		if (!blkid_probe_lookup_value(pr, "PART_ENTRY_TYPE", &data, NULL))
			prop->parttype = xstrdup(data);
		if (!blkid_probe_lookup_value(pr, "PART_ENTRY_UUID", &data, NULL))
			prop->partuuid = xstrdup(data);
		if (!blkid_probe_lookup_value(pr, "PART_ENTRY_NAME", &data, NULL))
			prop->partlabel = xstrdup(data);
		if (!blkid_probe_lookup_value(pr, "PART_ENTRY_FLAGS", &data, NULL))
			prop->partflags = xstrdup(data);

		DBG(DEV, ul_debugobj(dev, "%s: found blkid properties", dev->name));
	}

done:
	blkid_free_probe(pr);

	dev->blkid_requested = 1;
	return dev->properties;
}

struct lsblk_devprop *lsblk_device_get_properties(struct lsblk_device *dev)
{
	struct lsblk_devprop *p = get_properties_by_udev(dev);

	if (!p)
		p = get_properties_by_blkid(dev);
	return p;
}

void lsblk_properties_deinit(void)
{
#ifdef HAVE_LIBUDEV
	udev_unref(udev);
#endif
}