mount: fsprobe: add libvolume_id support

Signed-off-by: Matthias Koenig <mkoenig@suse.de>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 123 insertions, 0 deletions

diff --git a/mount/fsprobe_volumeid.c b/mount/fsprobe_volumeid.c
new file mode 100644
index 000000000..8c13987ad
--- /dev/null
+++ b/mount/fsprobe_volumeid.c
@@ -0,0 +1,123 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stddef.h>
+#include <sys/mount.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <libvolume_id.h>
+
+#include "fsprobe.h"
+#include "realpath.h"
+#include "mount_paths.h"
+#include "sundries.h"
+
+enum probe_type {
+	VOLUME_ID_NONE,
+	VOLUME_ID_LABEL,
+	VOLUME_ID_UUID,
+	VOLUME_ID_TYPE,
+};
+
+static char *probe(const char *device, enum probe_type type)
+{
+	int fd;
+	uint64_t size;
+	struct volume_id *id;
+	char *value = NULL;
+
+	fd = open(device, O_RDONLY);
+	if (fd < 0)
+		return NULL;
+
+	id = volume_id_open_fd(fd);
+	if (!id)
+		return NULL;
+
+	/* TODO: use blkdev_get_size() */
+	if (ioctl(fd, BLKGETSIZE64, &size) != 0)
+		size = 0;
+
+	if (volume_id_probe_all(id, 0, size) == 0) {
+		switch(type) {
+		case VOLUME_ID_LABEL:
+			value  = xstrdup(id->label);
+			break;
+		case VOLUME_ID_UUID:
+			value  = xstrdup(id->uuid);
+			break;
+		case VOLUME_ID_TYPE:
+			value  = xstrdup(id->type);
+			break;
+		default:
+			break;
+		}
+	}
+
+	volume_id_close(id);
+	return value;
+}
+
+void
+fsprobe_init(void)
+{
+}
+
+void
+fsprobe_exit(void)
+{
+}
+
+int
+fsprobe_known_fstype(const char *fstype)
+{
+	/* TODO 
+	if (volume_id_get_prober_by_type(fstype) != NULL)
+		return 1;
+	*/
+	return 0;
+}
+
+const char *
+fsprobe_get_uuid_by_devname(const char *devname)
+{
+	return probe(devname, VOLUME_ID_UUID);
+}
+
+const char *
+fsprobe_get_label_by_devname(const char *devname)
+{
+	return probe(devname, VOLUME_ID_LABEL);
+}
+
+const char *
+fsprobe_get_fstype_by_devname(const char *devname)
+{
+	return probe(devname, VOLUME_ID_TYPE);
+}
+
+const char *
+fsprobe_get_devname_by_uuid(const char *uuid)
+{
+	char dev[PATH_MAX];
+
+	if (!uuid)
+		return NULL;
+
+	snprintf(dev, sizeof(dev), PATH_DEV_BYUUID "/%s", uuid);
+	return canonicalize(dev);
+}
+
+const char *
+fsprobe_get_devname_by_label(const char *label)
+{
+	char dev[PATH_MAX];
+
+	if (!label)
+		return NULL;
+
+	snprintf(dev, sizeof(dev), PATH_DEV_BYLABEL "/%s", label);
+	return canonicalize(dev);
+}
+