1 /* libguestfs - the guestfsd daemon
2 * Copyright (C) 2009 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33 * Parted 1.9 sends error messages to stdout, hence use of the
34 * COMMAND_FLAG_FOLD_STDOUT_ON_STDERR flag.
36 * parted occasionally fails to do ioctl(BLKRRPART) on the device,
37 * apparently because of some internal race in the code. We attempt
38 * to detect and recover from this error if we can.
41 recover_blkrrpart (const char *device, const char *err)
46 "Error informing the kernel about modifications to partition"))
49 r = command (NULL, NULL, "blockdev", "--rereadpt", device, NULL);
58 #define RUN_PARTED(error,device,...) \
63 r = commandf (NULL, &err, COMMAND_FLAG_FOLD_STDOUT_ON_STDERR, \
64 "parted", "-s", "--", (device), __VA_ARGS__); \
66 if (recover_blkrrpart ((device), err) == -1) { \
67 reply_with_error ("%s: parted: %s: %s", __func__, (device), err); \
77 check_parttype (const char *parttype)
79 /* Check and translate parttype. */
80 if (STREQ (parttype, "aix") ||
81 STREQ (parttype, "amiga") ||
82 STREQ (parttype, "bsd") ||
83 STREQ (parttype, "dasd") ||
84 STREQ (parttype, "dvh") ||
85 STREQ (parttype, "gpt") ||
86 STREQ (parttype, "mac") ||
87 STREQ (parttype, "msdos") ||
88 STREQ (parttype, "pc98") ||
89 STREQ (parttype, "sun"))
91 else if (STREQ (parttype, "rdb"))
93 else if (STREQ (parttype, "efi"))
95 else if (STREQ (parttype, "mbr"))
102 do_part_init (const char *device, const char *parttype)
104 parttype = check_parttype (parttype);
106 reply_with_error ("unknown partition type: common choices are \"gpt\" and \"msdos\"");
110 RUN_PARTED (return -1, device, "mklabel", parttype, NULL);
118 do_part_add (const char *device, const char *prlogex,
119 int64_t startsect, int64_t endsect)
124 /* Check and translate prlogex. */
125 if (STREQ (prlogex, "primary") ||
126 STREQ (prlogex, "logical") ||
127 STREQ (prlogex, "extended"))
129 else if (STREQ (prlogex, "p"))
131 else if (STREQ (prlogex, "l"))
133 else if (STREQ (prlogex, "e"))
134 prlogex = "extended";
136 reply_with_error ("unknown partition type: %s: this should be \"primary\", \"logical\" or \"extended\"", prlogex);
141 reply_with_error ("startsect cannot be negative");
144 /* but endsect can be negative */
146 snprintf (startstr, sizeof startstr, "%" PRIi64 "s", startsect);
147 snprintf (endstr, sizeof endstr, "%" PRIi64 "s", endsect);
149 /* XXX Bug: If the partition table type (which we don't know in this
150 * function) is GPT, then this parted command sets the _partition
151 * name_ to prlogex, eg. "primary". I would essentially describe
152 * this as a bug in the parted mkpart command.
154 RUN_PARTED (return -1, device, "mkpart", prlogex, startstr, endstr, NULL);
162 do_part_del (const char *device, int partnum)
165 reply_with_error ("partition number must be >= 1");
169 char partnum_str[16];
170 snprintf (partnum_str, sizeof partnum_str, "%d", partnum);
172 RUN_PARTED (return -1, device, "rm", partnum_str, NULL);
179 do_part_disk (const char *device, const char *parttype)
181 const char *startstr;
184 parttype = check_parttype (parttype);
186 reply_with_error ("unknown partition type: common choices are \"gpt\" and \"msdos\"");
190 /* Voooooodooooooooo (thanks Jim Meyering for working this out). */
191 if (STREQ (parttype, "msdos")) {
194 } else if (STREQ (parttype, "gpt")) {
203 RUN_PARTED (return -1,
206 /* See comment about about the parted mkpart command. */
207 "mkpart", STREQ (parttype, "gpt") ? "p1" : "primary",
208 startstr, endstr, NULL);
216 do_part_set_bootable (const char *device, int partnum, int bootable)
219 reply_with_error ("partition number must be >= 1");
225 snprintf (partstr, sizeof partstr, "%d", partnum);
227 RUN_PARTED (return -1,
228 device, "set", partstr, "boot", bootable ? "on" : "off", NULL);
236 do_part_set_name (const char *device, int partnum, const char *name)
239 reply_with_error ("partition number must be >= 1");
245 snprintf (partstr, sizeof partstr, "%d", partnum);
247 RUN_PARTED (return -1, device, "name", partstr, name, NULL);
254 /* Return the nth field from a string of ':'/';'-delimited strings.
255 * Useful for parsing the return value from 'parted -m'.
258 get_table_field (const char *line, int n)
260 const char *p = line;
262 while (*p && n > 0) {
263 p += strcspn (p, ":;") + 1;
268 reply_with_error ("not enough fields in output of parted print command: %s",
273 size_t len = strcspn (p, ":;");
274 char *q = strndup (p, len);
276 reply_with_perror ("strndup");
283 /* RHEL 5 parted doesn't have the -m (machine readable) option so we
284 * must do a lot more work to parse the output in
285 * print_partition_table below. Test for this option the first time
286 * this function is called.
289 test_parted_m_opt (void)
291 static int result = -1;
297 fprintf (stderr, "Testing if this parted supports '-m' option.\n");
300 int r = commandr (NULL, &err, "parted", "-s", "-m", "/dev/null", NULL);
302 /* Test failed, eg. missing or completely unusable parted binary. */
303 reply_with_error ("could not run 'parted' command");
307 if (err && strstr (err, "invalid option -- m"))
314 print_partition_table (const char *device, int parted_has_m_opt)
319 if (parted_has_m_opt)
320 r = command (&out, &err, "parted", "-m", "--", device,
324 r = command (&out, &err, "parted", "-s", "--", device,
328 reply_with_error ("parted print: %s: %s", device,
329 /* Hack for parted 1.x which sends errors to stdout. */
338 fprintf (stderr, "parted output:\n%s<END>\n", out);
344 do_part_get_parttype (const char *device)
346 int parted_has_m_opt = test_parted_m_opt ();
347 if (parted_has_m_opt == -1)
350 char *out = print_partition_table (device, parted_has_m_opt);
354 if (parted_has_m_opt) {
355 /* New-style parsing using the "machine-readable" format from
358 char **lines = split_lines (out);
364 if (lines[0] == NULL || STRNEQ (lines[0], "BYT;")) {
365 reply_with_error ("unknown signature, expected \"BYT;\" as first line of the output: %s",
366 lines[0] ? lines[0] : "(signature was null)");
367 free_strings (lines);
371 if (lines[1] == NULL) {
372 reply_with_error ("parted didn't return a line describing the device");
373 free_strings (lines);
377 /* lines[1] is something like:
378 * "/dev/sda:1953525168s:scsi:512:512:msdos:ATA Hitachi HDT72101;"
380 char *r = get_table_field (lines[1], 5);
382 free_strings (lines);
386 free_strings (lines);
390 /* Old-style. Look for "\nPartition Table: <str>\n". */
391 char *p = strstr (out, "\nPartition Table: ");
393 reply_with_error ("parted didn't return Partition Table line");
399 char *q = strchr (p, '\n');
401 reply_with_error ("parted Partition Table has no end of line char");
411 reply_with_perror ("strdup");
415 return p; /* caller frees */
419 guestfs_int_partition_list *
420 do_part_list (const char *device)
422 int parted_has_m_opt = test_parted_m_opt ();
423 if (parted_has_m_opt == -1)
426 char *out = print_partition_table (device, parted_has_m_opt);
430 char **lines = split_lines (out);
436 guestfs_int_partition_list *r;
438 if (parted_has_m_opt) {
439 /* New-style parsing using the "machine-readable" format from
442 * lines[0] is "BYT;", lines[1] is the device line which we ignore,
443 * lines[2..] are the partitions themselves. Count how many.
445 size_t nr_rows = 0, row;
446 for (row = 2; lines[row] != NULL; ++row)
449 r = malloc (sizeof *r);
451 reply_with_perror ("malloc");
454 r->guestfs_int_partition_list_len = nr_rows;
455 r->guestfs_int_partition_list_val =
456 malloc (nr_rows * sizeof (guestfs_int_partition));
457 if (r->guestfs_int_partition_list_val == NULL) {
458 reply_with_perror ("malloc");
462 /* Now parse the lines. */
464 for (i = 0, row = 2; lines[row] != NULL; ++i, ++row) {
465 if (sscanf (lines[row], "%d:%" SCNi64 "B:%" SCNi64 "B:%" SCNi64 "B",
466 &r->guestfs_int_partition_list_val[i].part_num,
467 &r->guestfs_int_partition_list_val[i].part_start,
468 &r->guestfs_int_partition_list_val[i].part_end,
469 &r->guestfs_int_partition_list_val[i].part_size) != 4) {
470 reply_with_error ("could not parse row from output of parted print command: %s", lines[row]);
476 /* Old-style. Start at the line following "^Number", up to the
479 size_t start = 0, end = 0, row;
481 for (row = 0; lines[row] != NULL; ++row)
482 if (STRPREFIX (lines[row], "Number")) {
488 reply_with_error ("parted output has no \"Number\" line");
492 for (row = start; lines[row] != NULL; ++row)
493 if (STREQ (lines[row], "")) {
499 reply_with_error ("parted output has no blank after end of table");
503 size_t nr_rows = end - start;
505 r = malloc (sizeof *r);
507 reply_with_perror ("malloc");
510 r->guestfs_int_partition_list_len = nr_rows;
511 r->guestfs_int_partition_list_val =
512 malloc (nr_rows * sizeof (guestfs_int_partition));
513 if (r->guestfs_int_partition_list_val == NULL) {
514 reply_with_perror ("malloc");
518 /* Now parse the lines. */
520 for (i = 0, row = start; row < end; ++i, ++row) {
521 if (sscanf (lines[row], " %d %" SCNi64 "B %" SCNi64 "B %" SCNi64 "B",
522 &r->guestfs_int_partition_list_val[i].part_num,
523 &r->guestfs_int_partition_list_val[i].part_start,
524 &r->guestfs_int_partition_list_val[i].part_end,
525 &r->guestfs_int_partition_list_val[i].part_size) != 4) {
526 reply_with_error ("could not parse row from output of parted print command: %s", lines[row]);
532 free_strings (lines);
536 free (r->guestfs_int_partition_list_val);
540 free_strings (lines);
545 do_part_get_bootable (const char *device, int partnum)
548 reply_with_error ("partition number must be >= 1");
552 int parted_has_m_opt = test_parted_m_opt ();
553 if (parted_has_m_opt == -1)
556 char *out = print_partition_table (device, parted_has_m_opt);
560 char **lines = split_lines (out);
566 if (parted_has_m_opt) {
567 /* New-style parsing using the "machine-readable" format from
570 * We want lines[1+partnum].
572 if (count_strings (lines) < (size_t) 1+partnum) {
573 reply_with_error ("partition number out of range: %d", partnum);
574 free_strings (lines);
578 char *boot = get_table_field (lines[1+partnum], 6);
580 free_strings (lines);
584 int r = STREQ (boot, "boot");
587 free_strings (lines);
592 /* Old-style: First look for the line matching "^Number". */
593 size_t start = 0, header, row;
595 for (row = 0; lines[row] != NULL; ++row)
596 if (STRPREFIX (lines[row], "Number")) {
603 reply_with_error ("parted output has no \"Number\" line");
604 free_strings (lines);
608 /* Now we have to look at the column number of the "Flags" field.
609 * This is because parted's output has no way to represent a
610 * missing field except as whitespace, so we cannot just count
611 * fields from the left. eg. The "File system" field is often
612 * missing in the output.
614 char *p = strstr (lines[header], "Flags");
616 reply_with_error ("parted output has no \"Flags\" field");
617 free_strings (lines);
620 size_t col = p - lines[header];
622 /* Look for the line corresponding to this partition number. */
623 row = start + partnum - 1;
624 if (row >= count_strings (lines) || !STRPREFIX (lines[row], " ")) {
625 reply_with_error ("partition number out of range: %d", partnum);
626 free_strings (lines);
630 int r = STRPREFIX (&lines[row][col], "boot");
631 free_strings (lines);
636 /* Currently we use sfdisk for getting and setting the ID byte. In
637 * future, extend parted to provide this functionality. As a result
638 * of using sfdisk, this won't work for non-MBR-style partitions, but
639 * that limitation is noted in the documentation and we can extend it
640 * later without breaking the ABI.
643 do_part_get_mbr_id (const char *device, int partnum)
646 reply_with_error ("partition number must be >= 1");
650 char partnum_str[16];
651 snprintf (partnum_str, sizeof partnum_str, "%d", partnum);
656 r = command (&out, &err, "sfdisk", "--print-id", device, partnum_str, NULL);
658 reply_with_error ("sfdisk --print-id: %s", err);
666 /* It's printed in hex ... */
668 if (sscanf (out, "%x", &id) != 1) {
669 reply_with_error ("sfdisk --print-id: cannot parse output: %s", out);
679 do_part_set_mbr_id (const char *device, int partnum, int idbyte)
682 reply_with_error ("partition number must be >= 1");
686 char partnum_str[16];
687 snprintf (partnum_str, sizeof partnum_str, "%d", partnum);
690 snprintf (idbyte_str, sizeof partnum_str, "%x", idbyte); /* NB: hex */
695 r = command (NULL, &err, "sfdisk",
696 "--change-id", device, partnum_str, idbyte_str, NULL);
698 reply_with_error ("sfdisk --change-id: %s", err);