libfdisk: add sample-fdisk-mkpart-fullspec

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

3 files changed, 195 insertions, 2 deletions

diff --git a/libfdisk/samples/Makemodule.am b/libfdisk/samples/Makemodule.am
index d7c0cfa78..b67b12183 100644
--- a/libfdisk/samples/Makemodule.am
+++ b/libfdisk/samples/Makemodule.am
@@ -1,6 +1,7 @@
 
 check_PROGRAMS += \
-	sample-fdisk-mkpart
+	sample-fdisk-mkpart \
+	sample-fdisk-mkpart-fullspec
 
 sample_fdisk_cflags = $(AM_CFLAGS) $(NO_UNUSED_WARN_CFLAGS) \
                       -I$(ul_libfdisk_incdir)
@@ -9,3 +10,7 @@ sample_fdisk_ldadd = $(LDADD) libfdisk.la
 sample_fdisk_mkpart_SOURCES = libfdisk/samples/mkpart.c
 sample_fdisk_mkpart_LDADD = $(sample_fdisk_ldadd) libcommon.la
 sample_fdisk_mkpart_CFLAGS = $(sample_fdisk_cflags)
+
+sample_fdisk_mkpart_fullspec_SOURCES = libfdisk/samples/mkpart-fullspec.c
+sample_fdisk_mkpart_fullspec_LDADD = $(sample_fdisk_ldadd) libcommon.la
+sample_fdisk_mkpart_fullspec_CFLAGS = $(sample_fdisk_cflags)
diff --git a/libfdisk/samples/mkpart-fullspec.c b/libfdisk/samples/mkpart-fullspec.c
new file mode 100644
index 000000000..e566ced01
--- /dev/null
+++ b/libfdisk/samples/mkpart-fullspec.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2017 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ *
+ * Libfdisk sample to create partitions by specify all required partition
+ * properties (partno, start and size). The defauls is only partition type
+ * (except MBR where 4th partition is extended).
+ */
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <getopt.h>
+
+#include "c.h"
+#include "nls.h"
+#include "strutils.h"
+#include "xalloc.h"
+
+#include "libfdisk.h"
+
+static int ask_callback(struct fdisk_context *cxt __attribute__((__unused__)),
+			struct fdisk_ask *ask,
+			void *data)
+{
+	switch(fdisk_ask_get_type(ask)) {
+	case FDISK_ASKTYPE_INFO:
+		fputs(fdisk_ask_print_get_mesg(ask), stdout);
+		fputc('\n', stdout);
+		break;
+	case FDISK_ASKTYPE_WARNX:
+		fflush(stdout);
+		fputs(fdisk_ask_print_get_mesg(ask), stderr);
+		fputc('\n', stderr);
+		break;
+	case FDISK_ASKTYPE_WARN:
+		fflush(stdout);
+		fputs(fdisk_ask_print_get_mesg(ask), stderr);
+		errno = fdisk_ask_print_get_errno(ask);
+		fprintf(stderr, ": %m\n");
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	struct fdisk_context *cxt;
+	struct fdisk_partition *pa;
+	const char *label = NULL, *device = NULL;
+	int c;
+
+	static const struct option longopts[] = {
+		{ "label",  required_argument, NULL, 'x' },
+		{ "device", required_argument, NULL, 'd' },
+		{ "help",   no_argument, NULL, 'h' },
+		{ NULL, 0, NULL, 0 },
+	};
+
+	setlocale(LC_ALL, "");	/* just to have enable UTF8 chars */
+
+	fdisk_init_debug(0);
+
+	while((c = getopt_long(argc, argv, "x:d:h", longopts, NULL)) != -1) {
+		switch(c) {
+		case 'x':
+			label = optarg;
+			break;
+		case 'd':
+			device = optarg;
+			break;
+		case 'h':
+			printf("%s [options] <partno,start,size> ...", program_invocation_short_name);
+			fputs(USAGE_SEPARATOR, stdout);
+			puts("Make disklabel and partitions.");
+			puts(" <partno>                     number from 1..n (4th is extended for MBR)");
+			puts(" <start>                      partition start offset in sectors");
+			puts(" <size>                       partition size in sectors");
+			fputs(USAGE_OPTIONS, stdout);
+			puts(" -x, --label <dos,gpt,...>    disk label type (default MBR)");
+			puts(" -d, --device <path>          block device");
+			puts(" -h, --help                   this help");
+			fputs(USAGE_SEPARATOR, stdout);
+			return EXIT_SUCCESS;
+		}
+	}
+
+	if (!device)
+		errx(EXIT_FAILURE, "no device specified");
+	if (!label)
+		label = "dos";
+
+	cxt = fdisk_new_context();
+	if (!cxt)
+		err_oom();
+	fdisk_set_ask(cxt, ask_callback, NULL);
+
+	pa = fdisk_new_partition();
+	if (!pa)
+		err_oom();
+
+	if (fdisk_assign_device(cxt, device, 0))
+		err(EXIT_FAILURE, "failed to assign device");
+	if (fdisk_create_disklabel(cxt, "dos"))
+		err(EXIT_FAILURE, "failed to create disk label");
+
+	while (optind < argc) {
+		int rc;
+		unsigned int partno = 0;
+		uint64_t start = 0, size = 0;
+		const char *str = argv[optind];
+
+		if (sscanf(str, "%u,%ju,%ju", &partno, &start, &size) != 3)
+			errx(EXIT_FAILURE, "faild to parse %s", str);
+
+		/* disable defaults */
+		fdisk_partition_partno_follow_default(pa, 0);
+		fdisk_partition_end_follow_default(pa, 0);
+
+		/* set all */
+		fdisk_partition_set_partno(pa, partno - 1);	/* library uses 0..n */
+		fdisk_partition_set_start(pa, start);
+		fdisk_partition_set_size(pa, size);
+
+		fprintf(stderr, "Requested partition: <partno=%zu,start=%ju,size=%ju>\n",
+				fdisk_partition_get_partno(pa),
+				fdisk_partition_get_start(pa),
+				fdisk_partition_get_size(pa));
+
+		if (fdisk_is_label(cxt, DOS)) {
+			/* Make sure last primary partition is extended if user
+			 * wants more than 4 partitions.
+			 */
+			if (partno == 4 && optind + 1 < argc) {
+				struct fdisk_parttype *type =
+					fdisk_label_parse_parttype(
+							fdisk_get_label(cxt, NULL), "05");
+				if (!type)
+					err_oom();
+				fdisk_partition_set_type(pa, type);
+				fdisk_unref_parttype(type);
+			}
+		}
+
+		rc = fdisk_add_partition(cxt, pa, NULL);
+		if (rc) {
+			errno = -rc;
+			err(EXIT_FAILURE, "failed to add #%d partition", partno);
+		}
+
+		fdisk_reset_partition(pa);
+		optind++;
+	}
+
+	if (fdisk_write_disklabel(cxt))
+		err(EXIT_FAILURE, "failed to write disk label");
+
+	fdisk_deassign_device(cxt, 1);
+	fdisk_unref_context(cxt);
+	fdisk_unref_partition(pa);
+
+	return EXIT_SUCCESS;
+}
diff --git a/libfdisk/samples/mkpart.c b/libfdisk/samples/mkpart.c
index 4ca3ed35d..44a97d6fd 100644
--- a/libfdisk/samples/mkpart.c
+++ b/libfdisk/samples/mkpart.c
@@ -3,7 +3,24 @@
  *
  * This file may be redistributed under the terms of the
  * GNU Lesser General Public License.
- */
+ *
+ *
+ * Libfdisk sample to create partitions by specify size, for example:
+ *
+ *	mkpart --label dos --device /dev/sdc 2M 2M 2M 10M 1M -
+ *
+  * creates 6 partitions:
+  *	- 3 primary  (3x 2M)
+  *	- 1 extended (1x 10M)
+  *	- 2 logical  (1x 1M, 1x remaining-space-in-extended-partition)
+  *
+  * Notes:
+  *     The sample specifies size and partno for MBR, and size only for another
+  *     labels (e.g. GPT).
+  *
+  *     The Ask-API does not use anything else than warning/info. The
+  *     partitionning has to be done non-interactive.
+  */
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>