libblkid: add mkfs sample

Signed-off-by: Karel Zak <kzak@redhat.com>

shlibs/blkid/samples/.gitignore

@@ -1,2 +1,3 @@
 topology
 partitions
+mkfs

shlibs/blkid/samples/Makefile.am

@@ -3,5 +3,5 @@ include $(top_srcdir)/config/include-Makefile.am
 AM_CPPFLAGS += -I$(ul_libblkid_srcdir)
 AM_LDFLAGS += $(ul_libblkid_la)
 
-noinst_PROGRAMS = topology partitions
+noinst_PROGRAMS = topology partitions mkfs
 

shlibs/blkid/samples/mkfs.c

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <err.h>
+#include <errno.h>
+
+#include <blkid.h>
+
+#ifndef TRUE
+# define TRUE 1
+# define FALSE 0
+#endif
+
+int main(int argc, char *argv[])
+{
+	int fd, rc;
+	char *devname;
+	blkid_probe pr;
+	blkid_topology tp;
+
+	if (argc < 2) {
+		fprintf(stderr, "usage: %s <device>  "
+			"-- checks based on libblkid for mkfs-like programs.\n",
+			program_invocation_short_name);
+		return EXIT_FAILURE;
+	}
+
+	devname = argv[1];
+
+	fd = open(devname, O_RDONLY);
+	if (fd < 0)
+		err(EXIT_FAILURE, "%s: open() failed", devname);
+
+	pr = blkid_new_probe();
+	if (!pr)
+		err(EXIT_FAILURE, "faild to allocate a new libblkid probe");
+
+	if (blkid_probe_set_device(pr, fd, 0, 0) != 0)
+		err(EXIT_FAILURE, "failed to assign device to libblkid probe");
+
+	/*
+	 * check Filesystems / Partitions overwrite
+	 */
+
+	/* enable partitions probing (superblocks are enabled by default) */
+	blkid_probe_enable_partitions(pr, TRUE);
+
+	rc = blkid_do_fullprobe(pr);
+	if (rc == -1)
+		errx(EXIT_FAILURE, "%s: blkid_do_fullprobe() failed", devname);
+	else if (rc == 0) {
+		const char *type;
+
+		if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL))
+			errx(EXIT_FAILURE, "%s: appears to contain an existing "
+					"filesystem (%s)", devname, type);
+
+		if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL))
+			errx(EXIT_FAILURE, "%s: appears to contain an partition "
+					"table (%s)", devname, type);
+	}
+
+	/*
+	 * get topology details
+	 */
+	tp = blkid_probe_get_topology(pr);
+	if (!tp)
+		err(EXIT_FAILURE, "%s: failed to read topology", devname);
+
+
+	/* ... your mkfs.<type> code or so ...
+
+	off = blkid_topology_get_alignment_offset(tp);
+
+
+	 */
+
+	return EXIT_SUCCESS;
+}