2 * Copyright (C) 2010-2011 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 along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 (* Minimum surplus before we create an extra partition. *)
26 let min_extra_partition = 10L *^ 1024L *^ 1024L
28 (* Command line argument parsing. *)
29 let prog = Filename.basename Sys.executable_name
31 let infile, outfile, copy_boot_loader, debug, deletes, dryrun,
32 expand, expand_content, extra_partition, format, ignores,
33 lv_expands, machine_readable, ntfsresize_force, output_format,
34 quiet, resizes, resizes_force, shrink =
35 let display_version () =
36 let g = new G.guestfs () in
37 let version = g#version () in
38 printf "virt-resize %Ld.%Ld.%Ld%s\n"
39 version.G.major version.G.minor version.G.release version.G.extra;
43 let add xs s = xs := s :: !xs in
45 let copy_boot_loader = ref true in
46 let debug = ref false in
47 let deletes = ref [] in
48 let dryrun = ref false in
49 let expand = ref "" in
51 if s = "" then error "%s: empty --expand option" prog
52 else if !expand <> "" then error "--expand option given twice"
55 let expand_content = ref true in
56 let extra_partition = ref true in
57 let format = ref "" in
58 let ignores = ref [] in
59 let lv_expands = ref [] in
60 let machine_readable = ref false in
61 let ntfsresize_force = ref false in
62 let output_format = ref "" in
63 let quiet = ref false in
64 let resizes = ref [] in
65 let resizes_force = ref [] in
66 let shrink = ref "" in
68 if s = "" then error "empty --shrink option"
69 else if !shrink <> "" then error "--shrink option given twice"
73 let argspec = Arg.align [
74 "--no-copy-boot-loader", Arg.Clear copy_boot_loader, " Don't copy boot loader";
75 "-d", Arg.Set debug, " Enable debugging messages";
76 "--debug", Arg.Set debug, " -\"-";
77 "--delete", Arg.String (add deletes), "part Delete partition";
78 "--expand", Arg.String set_expand, "part Expand partition";
79 "--no-expand-content", Arg.Clear expand_content, " Don't expand content";
80 "--no-extra-partition", Arg.Clear extra_partition, " Don't create extra partition";
81 "--format", Arg.Set_string format, "format Format of input disk";
82 "--ignore", Arg.String (add ignores), "part Ignore partition";
83 "--lv-expand", Arg.String (add lv_expands), "lv Expand logical volume";
84 "--LV-expand", Arg.String (add lv_expands), "lv -\"-";
85 "--lvexpand", Arg.String (add lv_expands), "lv -\"-";
86 "--LVexpand", Arg.String (add lv_expands), "lv -\"-";
87 "--machine-readable", Arg.Set machine_readable, " Make output machine readable";
88 "-n", Arg.Set dryrun, " Don't perform changes";
89 "--dryrun", Arg.Set dryrun, " -\"-";
90 "--dry-run", Arg.Set dryrun, " -\"-";
91 "--ntfsresize-force", Arg.Set ntfsresize_force, " Force ntfsresize";
92 "--output-format", Arg.Set_string format, "format Format of output disk";
93 "-q", Arg.Set quiet, " Don't print the summary";
94 "--quiet", Arg.Set quiet, " -\"-";
95 "--resize", Arg.String (add resizes), "part=size Resize partition";
96 "--resize-force", Arg.String (add resizes_force), "part=size Forcefully resize partition";
97 "--shrink", Arg.String set_shrink, "part Shrink partition";
98 "-V", Arg.Unit display_version, " Display version and exit";
99 "--version", Arg.Unit display_version, " -\"-";
101 let disks = ref [] in
102 let anon_fun s = disks := s :: !disks in
105 %s: resize a virtual machine disk
107 A short summary of the options is given below. For detailed help please
108 read the man page virt-resize(1).
111 Arg.parse argspec anon_fun usage_msg;
113 let debug = !debug in
115 eprintf "command line:";
116 List.iter (eprintf " %s") (Array.to_list Sys.argv);
120 (* Dereference the rest of the args. *)
121 let copy_boot_loader = !copy_boot_loader in
122 let deletes = List.rev !deletes in
123 let dryrun = !dryrun in
124 let expand = match !expand with "" -> None | str -> Some str in
125 let expand_content = !expand_content in
126 let extra_partition = !extra_partition in
127 let format = match !format with "" -> None | str -> Some str in
128 let ignores = List.rev !ignores in
129 let lv_expands = List.rev !lv_expands in
130 let machine_readable = !machine_readable in
131 let ntfsresize_force = !ntfsresize_force in
132 let output_format = match !output_format with "" -> None | str -> Some str in
133 let quiet = !quiet in
134 let resizes = List.rev !resizes in
135 let resizes_force = List.rev !resizes_force in
136 let shrink = match !shrink with "" -> None | str -> Some str in
138 (* No arguments and machine-readable mode? Print out some facts
139 * about what this binary supports. We only need to print out new
140 * things added since this option, or things which depend on features
143 if !disks = [] && machine_readable then (
144 printf "virt-resize\n";
145 printf "ntfsresize-force\n";
147 printf "128-sector-alignment\n";
148 let g = new G.guestfs () in
149 g#add_drive_opts "/dev/null";
151 if feature_available g [| "ntfsprogs"; "ntfs3g" |] then
153 if feature_available g [| "btrfs" |] then
158 (* Verify we got exactly 2 disks. *)
159 let infile, outfile =
160 match List.rev !disks with
161 | [infile; outfile] -> infile, outfile
163 error "usage is: %s [--options] indisk outdisk" prog in
165 infile, outfile, copy_boot_loader, debug, deletes, dryrun,
166 expand, expand_content, extra_partition, format, ignores,
167 lv_expands, machine_readable, ntfsresize_force, output_format,
168 quiet, resizes, resizes_force, shrink
170 (* Default to true, since NTFS and btrfs support are usually available. *)
171 let ntfs_available = ref true
172 let btrfs_available = ref true
174 (* Add in and out disks to the handle and launch. *)
175 let connect_both_disks () =
176 let g = new G.guestfs () in
177 if debug then g#set_trace true;
178 g#add_drive_opts ?format ~readonly:true infile;
179 g#add_drive_opts ?format:output_format ~readonly:false outfile;
180 if not quiet then Progress.set_up_progress_bar ~machine_readable g;
183 (* Set the filter to /dev/sda, in case there are any rogue
184 * PVs lying around on the target disk.
186 g#lvm_set_filter [|"/dev/sda"|];
188 (* Update features available in the daemon. *)
189 ntfs_available := feature_available g [|"ntfsprogs"; "ntfs3g"|];
190 btrfs_available := feature_available g [|"btrfs"|];
196 printf "Examining %s ...\n%!" infile;
198 let g = connect_both_disks () in
202 (* Get the size in bytes of each disk.
204 * Originally we computed this by looking at the same of the host file,
205 * but of course this failed for qcow2 images (RHBZ#633096). The right
206 * way to do it is with g#blockdev_getsize64.
208 let sectsize, insize, outsize =
209 let sectsize = g#blockdev_getss "/dev/sdb" in
210 let insize = g#blockdev_getsize64 "/dev/sda" in
211 let outsize = g#blockdev_getsize64 "/dev/sdb" in
213 eprintf "%s size %Ld bytes\n" infile insize;
214 eprintf "%s size %Ld bytes\n" outfile outsize
216 sectsize, insize, outsize
219 (* In reality the number of sectors containing boot loader data will be
220 * less than this (although Windows 7 defaults to putting the first
221 * partition on sector 2048, and has quite a large boot loader).
223 * However make this large enough to be sure that we have copied over
224 * the boot loader. We could also do this by looking for the sector
225 * offset of the first partition.
227 * It doesn't matter if we copy too much.
231 (* Check the disks are at least as big as the bootloader. *)
233 if insize < Int64.of_int max_bootloader then
234 error "%s: file is too small to be a disk image (%Ld bytes)"
236 if outsize < Int64.of_int max_bootloader then
237 error "%s: file is too small to be a disk image (%Ld bytes)"
240 (* Build a data structure describing the source disk's partition layout. *)
242 p_name : string; (* Device name, like /dev/sda1. *)
243 p_part : G.partition; (* SOURCE partition data from libguestfs. *)
244 p_bootable : bool; (* Is it bootable? *)
245 p_mbr_id : int option; (* MBR ID, if it has one. *)
246 p_type : partition_content; (* Content type and content size. *)
248 (* What we're going to do: *)
249 mutable p_operation : partition_operation;
250 p_target_partnum : int; (* TARGET partition number. *)
251 p_target_start : int64; (* TARGET partition start (sector num). *)
252 p_target_end : int64; (* TARGET partition end (sector num). *)
254 and partition_content =
255 | ContentUnknown (* undetermined *)
256 | ContentPV of int64 (* physical volume (size of PV) *)
257 | ContentFS of string * int64 (* mountable filesystem (FS type, FS size) *)
258 and partition_operation =
259 | OpCopy (* copy it as-is, no resizing *)
260 | OpIgnore (* ignore it (create on target, but don't
262 | OpDelete (* delete it *)
263 | OpResize of int64 (* resize it to the new size *)
265 let rec debug_partition p =
266 eprintf "%s:\n" p.p_name;
267 eprintf "\tpartition data: %ld %Ld-%Ld (%Ld bytes)\n"
268 p.p_part.G.part_num p.p_part.G.part_start p.p_part.G.part_end
269 p.p_part.G.part_size;
270 eprintf "\tbootable: %b\n" p.p_bootable;
271 eprintf "\tpartition ID: %s\n"
272 (match p.p_mbr_id with None -> "(none)" | Some i -> sprintf "0x%x" i);
273 eprintf "\tcontent: %s\n" (string_of_partition_content p.p_type)
274 and string_of_partition_content = function
275 | ContentUnknown -> "unknown data"
276 | ContentPV sz -> sprintf "LVM PV (%Ld bytes)" sz
277 | ContentFS (fs, sz) -> sprintf "filesystem %s (%Ld bytes)" fs sz
278 and string_of_partition_content_no_size = function
279 | ContentUnknown -> "unknown data"
280 | ContentPV _ -> sprintf "LVM PV"
281 | ContentFS (fs, _) -> sprintf "filesystem %s" fs
283 let get_partition_content =
284 let pvs_full = Array.to_list (g#pvs_full ()) in
287 let fs = g#vfs_type dev in
288 if fs = "unknown" then
290 else if fs = "LVM2_member" then (
291 let rec loop = function
293 error "%s: physical volume not returned by pvs_full"
295 | pv :: _ when canonicalize pv.G.pv_name = dev ->
296 ContentPV pv.G.pv_size
297 | _ :: pvs -> loop pvs
303 let stat = g#statvfs "/" in
304 let size = stat.G.bsize *^ stat.G.blocks in
308 G.Error _ -> ContentUnknown
310 let partitions : partition list =
311 let parts = Array.to_list (g#part_list "/dev/sda") in
313 if List.length parts = 0 then
314 error "the source disk has no partitions";
318 fun ({ G.part_num = part_num } as part) ->
319 let part_num = Int32.to_int part_num in
320 let name = sprintf "/dev/sda%d" part_num in
321 let bootable = g#part_get_bootable "/dev/sda" part_num in
323 try Some (g#part_get_mbr_id "/dev/sda" part_num)
324 with G.Error _ -> None in
325 let typ = get_partition_content name in
327 { p_name = name; p_part = part;
328 p_bootable = bootable; p_mbr_id = mbr_id; p_type = typ;
329 p_operation = OpCopy; p_target_partnum = 0;
330 p_target_start = 0L; p_target_end = 0L }
334 eprintf "%d partitions found\n" (List.length partitions);
335 List.iter debug_partition partitions
338 (* Check content isn't larger than partitions. If it is then
339 * something has gone wrong and we shouldn't continue. Old
340 * virt-resize didn't do these checks.
344 | { p_name = name; p_part = { G.part_size = size };
345 p_type = ContentPV pv_size }
346 when size < pv_size ->
347 error "%s: partition size %Ld < physical volume size %Ld"
349 | { p_name = name; p_part = { G.part_size = size };
350 p_type = ContentFS (_, fs_size) }
351 when size < fs_size ->
352 error "%s: partition size %Ld < filesystem size %Ld"
357 (* Check partitions don't overlap. *)
358 let rec loop end_of_prev = function
360 | { p_name = name; p_part = { G.part_start = part_start } } :: _
361 when end_of_prev > part_start ->
362 error "%s: this partition overlaps the previous one" name
363 | { p_part = { G.part_end = part_end } } :: parts -> loop part_end parts
369 (* Build a data structure describing LVs on the source disk.
370 * This is only used if the user gave the --lv-expand option.
374 lv_type : logvol_content;
375 mutable lv_operation : logvol_operation
377 and logvol_content = partition_content (* except ContentPV cannot occur *)
378 and logvol_operation =
379 | LVOpNone (* nothing *)
380 | LVOpExpand (* expand it *)
382 let debug_logvol lv =
383 eprintf "%s:\n" lv.lv_name;
384 eprintf "\tcontent: %s\n" (string_of_partition_content lv.lv_type)
387 let lvs = Array.to_list (g#lvs ()) in
391 let typ = get_partition_content name in
392 assert (match typ with ContentPV _ -> false | _ -> true);
394 { lv_name = name; lv_type = typ; lv_operation = LVOpNone }
398 eprintf "%d logical volumes found\n" (List.length lvs);
399 List.iter debug_logvol lvs
404 (* These functions tell us if we know how to expand the content of
405 * a particular partition or LV, and what method to use.
407 type expand_content_method =
408 | PVResize | Resize2fs | NTFSResize | BtrfsFilesystemResize
410 let string_of_expand_content_method = function
411 | PVResize -> "pvresize"
412 | Resize2fs -> "resize2fs"
413 | NTFSResize -> "ntfsresize"
414 | BtrfsFilesystemResize -> "btrfs-filesystem-resize"
416 let can_expand_content =
417 if expand_content then
419 | ContentUnknown -> false
420 | ContentPV _ -> true
421 | ContentFS (("ext2"|"ext3"|"ext4"), _) -> true
422 | ContentFS (("ntfs"), _) when !ntfs_available -> true
423 | ContentFS (("btrfs"), _) when !btrfs_available -> true
424 | ContentFS (_, _) -> false
428 let expand_content_method =
429 if expand_content then
431 | ContentUnknown -> assert false
432 | ContentPV _ -> PVResize
433 | ContentFS (("ext2"|"ext3"|"ext4"), _) -> Resize2fs
434 | ContentFS (("ntfs"), _) when !ntfs_available -> NTFSResize
435 | ContentFS (("btrfs"), _) when !btrfs_available -> BtrfsFilesystemResize
436 | ContentFS (_, _) -> assert false
438 fun _ -> assert false
440 (* Helper function to locate a partition given what the user might
441 * type on the command line. It also gives errors for partitions
442 * that the user has asked to be ignored or deleted.
445 let hash = Hashtbl.create 13 in
446 List.iter (fun ({ p_name = name } as p) -> Hashtbl.add hash name p)
450 if String.length name < 5 || String.sub name 0 5 <> "/dev/" then
454 let name = canonicalize name in
457 try Hashtbl.find hash name
459 error "%s: partition not found in the source disk image (this error came from '%s' option on the command line). Try running this command: virt-filesystems --partitions --long -a %s"
460 name option infile in
462 if partition.p_operation = OpIgnore then
463 error "%s: partition already ignored, you cannot use it in '%s' option"
466 if partition.p_operation = OpDelete then
467 error "%s: partition already deleted, you cannot use it in '%s' option"
472 (* Handle --ignore option. *)
476 let p = find_partition ~option:"--ignore" dev in
477 p.p_operation <- OpIgnore
480 (* Handle --delete option. *)
484 let p = find_partition ~option:"--delete" dev in
485 p.p_operation <- OpDelete
488 (* Helper function to mark a partition for resizing. It prevents the
489 * user from trying to mark the same partition twice. If the force
490 * flag is given, then we will allow the user to shrink the partition
491 * even if we think that would destroy the content.
493 let mark_partition_for_resize ~option ?(force = false) p newsize =
494 let name = p.p_name in
495 let oldsize = p.p_part.G.part_size in
497 (match p.p_operation with
499 error "%s: this partition has already been marked for resizing"
501 | OpIgnore | OpDelete ->
502 (* This error should have been caught already by find_partition ... *)
503 error "%s: this partition has already been ignored or deleted"
508 (* Only do something if the size will change. *)
509 if oldsize <> newsize then (
510 let bigger = newsize > oldsize in
512 if not bigger && not force then (
513 (* Check if this contains filesystem content, and how big that is
514 * and whether we will destroy any content by shrinking this.
518 error "%s: This partition has unknown content which might be damaged by shrinking it. If you want to shrink this partition, you need to use the '--resize-force' option, but that could destroy any data on this partition. (This error came from '%s' option on the command line.)"
520 | ContentPV size when size > newsize ->
521 error "%s: This partition has contains an LVM physical volume which will be damaged by shrinking it below %Ld bytes (user asked to shrink it to %Ld bytes). If you want to shrink this partition, you need to use the '--resize-force' option, but that could destroy any data on this partition. (This error came from '%s' option on the command line.)"
522 name size newsize option
524 | ContentFS (fstype, size) when size > newsize ->
525 error "%s: This partition has contains a %s filesystem which will be damaged by shrinking it below %Ld bytes (user asked to shrink it to %Ld bytes). If you want to shrink this partition, you need to use the '--resize-force' option, but that could destroy any data on this partition. (This error came from '%s' option on the command line.)"
526 name fstype size newsize option
530 p.p_operation <- OpResize newsize
533 (* Handle --resize and --resize-force options. *)
535 let do_resize ~option ?(force = false) arg =
536 (* Argument is "dev=size". *)
539 let i = String.index arg '=' in
540 let n = String.length arg - (i+1) in
541 if n == 0 then raise Not_found;
542 String.sub arg 0 i, String.sub arg (i+1) n
544 error "%s: missing size field in '%s' option" arg option in
546 let p = find_partition ~option dev in
548 (* Parse the size field. *)
549 let oldsize = p.p_part.G.part_size in
550 let newsize = parse_size oldsize sizefield in
552 if newsize <= 0L then
553 error "%s: new partition size is zero or negative" dev;
555 mark_partition_for_resize ~option ~force p newsize
558 List.iter (do_resize ~option:"--resize") resizes;
559 List.iter (do_resize ~option:"--resize-force" ~force:true) resizes_force
561 (* Helper function calculates the surplus space, given the total
562 * required so far for the current partition layout, compared to
563 * the size of the target disk. If the return value >= 0 then it's
564 * a surplus, if it is < 0 then it's a deficit.
566 let calculate_surplus () =
567 (* We need some overhead for partitioning. Worst case would be for
568 * EFI partitioning + massive per-partition alignment.
570 let nr_partitions = List.length partitions in
571 let overhead = (Int64.of_int sectsize) *^ (
572 2L *^ 64L +^ (* GPT start and end *)
573 (128L *^ (Int64.of_int (nr_partitions + 1))) (* Maximum alignment *)
575 (Int64.of_int (max_bootloader - 64 * 512)) in (* Bootloader *)
577 let required = List.fold_left (
580 match p.p_operation with
581 | OpCopy | OpIgnore -> p.p_part.G.part_size
583 | OpResize newsize -> newsize in
587 outsize -^ (required +^ overhead)
589 (* Handle --expand and --shrink options. *)
591 if expand <> None && shrink <> None then
592 error "you cannot use options --expand and --shrink together";
594 if expand <> None || shrink <> None then (
595 let surplus = calculate_surplus () in
598 eprintf "surplus before --expand or --shrink: %Ld\n" surplus;
604 error "You cannot use --expand when there is no surplus space to expand into. You need to make the target disk larger by at least %s."
605 (human_size (Int64.neg surplus));
607 let option = "--expand" in
608 let p = find_partition ~option dev in
609 let oldsize = p.p_part.G.part_size in
610 mark_partition_for_resize ~option p (oldsize +^ surplus)
616 error "You cannot use --shrink when there is no deficit (see 'deficit' in the virt-resize(1) man page).";
618 let option = "--shrink" in
619 let p = find_partition ~option dev in
620 let oldsize = p.p_part.G.part_size in
621 mark_partition_for_resize ~option p (oldsize +^ surplus)
625 (* Calculate the final surplus.
626 * At this point, this number must be >= 0.
629 let surplus = calculate_surplus () in
631 if surplus < 0L then (
632 let deficit = Int64.neg surplus in
633 error "There is a deficit of %Ld bytes (%s). You need to make the target disk larger by at least this amount or adjust your resizing requests."
634 deficit (human_size deficit)
639 (* Mark the --lv-expand LVs. *)
641 let hash = Hashtbl.create 13 in
642 List.iter (fun ({ lv_name = name } as lv) -> Hashtbl.add hash name lv) lvs;
647 try Hashtbl.find hash name
649 error "%s: logical volume not found in the source disk image (this error came from '--lv-expand' option on the command line). Try running this command: virt-filesystems --logical-volumes --long -a %s"
651 lv.lv_operation <- LVOpExpand
654 (* Print a summary of what we will do. *)
659 printf "**********\n\n";
660 printf "Summary of changes:\n\n";
663 fun ({ p_name = name; p_part = { G.part_size = oldsize }} as p) ->
665 match p.p_operation with
667 sprintf "%s: This partition will be left alone." name
669 sprintf "%s: This partition will be created, but the contents will be ignored (ie. not copied to the target)." name
671 sprintf "%s: This partition will be deleted." name
672 | OpResize newsize ->
673 sprintf "%s: This partition will be resized from %s to %s."
674 name (human_size oldsize) (human_size newsize) ^
675 if can_expand_content p.p_type then (
676 sprintf " The %s on %s will be expanded using the '%s' method."
677 (string_of_partition_content_no_size p.p_type)
679 (string_of_expand_content_method
680 (expand_content_method p.p_type))
683 wrap ~hanging:4 (text ^ "\n\n")
687 fun ({ lv_name = name } as lv) ->
688 match lv.lv_operation with
692 sprintf "%s: This logical volume will be expanded to maximum size."
694 if can_expand_content lv.lv_type then (
695 sprintf " The %s on %s will be expanded using the '%s' method."
696 (string_of_partition_content_no_size lv.lv_type)
698 (string_of_expand_content_method
699 (expand_content_method lv.lv_type))
702 wrap ~hanging:4 (text ^ "\n\n")
705 if surplus > 0L then (
707 sprintf "There is a surplus of %s." (human_size surplus) ^
708 if extra_partition then (
709 if surplus >= min_extra_partition then
710 sprintf " An extra partition will be created for the surplus."
712 sprintf " The surplus space is not large enough for an extra partition to be created and so it will just be ignored."
714 sprintf " The surplus space will be ignored. Run a partitioning program in the guest to partition this extra space if you want." in
719 printf "**********\n";
723 if dryrun then exit 0
725 (* Create a partition table.
727 * We *must* do this before copying the bootloader across, and copying
728 * the bootloader must be careful not to disturb this partition table
729 * (RHBZ#633766). There are two reasons for this:
731 * (1) The 'parted' library is stupid and broken. In many ways. In
732 * this particular instance the stupid and broken bit is that it
733 * overwrites the whole boot sector when initializating a partition
734 * table. (Upstream don't consider this obvious problem to be a bug).
736 * (2) GPT has a backup partition table located at the end of the disk.
737 * It's non-movable, because the primary GPT contains fixed references
738 * to both the size of the disk and the backup partition table at the
739 * end. This would be a problem for any resize that didn't either
740 * carefully move the backup GPT (and rewrite those references) or
741 * recreate the whole partition table from scratch.
744 let parttype = g#part_get_parttype "/dev/sda" in
745 if debug then eprintf "partition table type: %s\n%!" parttype;
747 (* Try hard to initialize the partition table. This might involve
748 * relaunching another handle.
751 printf "Setting up initial partition table on %s ...\n%!" outfile;
753 let last_error = ref "" in
754 let rec initialize_partition_table g attempts =
756 try g#part_init "/dev/sdb" parttype; true
757 with G.Error error -> last_error := error; false in
759 else if attempts > 0 then (
764 let g = connect_both_disks () in
765 initialize_partition_table g (attempts-1)
770 let g, ok = initialize_partition_table g 5 in
772 error "Failed to initialize the partition table on the target disk. You need to wipe or recreate the target disk and then run virt-resize again.\n\nThe underlying error was: %s" !last_error;
776 (* Copy the bootloader across.
777 * Don't disturb the partition table that we just wrote.
778 * https://secure.wikimedia.org/wikipedia/en/wiki/Master_Boot_Record
779 * https://secure.wikimedia.org/wikipedia/en/wiki/GUID_Partition_Table
782 if copy_boot_loader then (
783 let bootsect = g#pread_device "/dev/sda" 446 0L in
784 if String.length bootsect < 446 then
785 error "pread-device: short read";
786 ignore (g#pwrite_device "/dev/sdb" bootsect 0L);
789 if parttype <> "gpt" then 512L
791 (* XXX With 4K sectors does GPT just fit more entries in a
792 * sector, or does it always use 34 sectors?
796 let loader = g#pread_device "/dev/sda" max_bootloader start in
797 if String.length loader < max_bootloader then
798 error "pread-device: short read";
799 ignore (g#pwrite_device "/dev/sdb" loader start)
802 (* Repartition the target disk. *)
804 (* Calculate the location of the partitions on the target disk. This
805 * also removes from the list any partitions that will be deleted, so
806 * the final list just contains partitions that need to be created
810 let sectsize = Int64.of_int sectsize in
812 let rec loop partnum start = function
814 (match p.p_operation with
815 | OpDelete -> loop partnum start ps (* skip p *)
817 | OpIgnore | OpCopy -> (* same size *)
818 (* Size in sectors. *)
819 let size = (p.p_part.G.part_size +^ sectsize -^ 1L) /^ sectsize in
820 (* Start of next partition + alignment. *)
821 let end_ = start +^ size in
822 let next = (end_ +^ 127L) &^ (~^ 127L) in
824 { p with p_target_start = start; p_target_end = end_ -^ 1L;
825 p_target_partnum = partnum } :: loop (partnum+1) next ps
827 | OpResize newsize -> (* resized partition *)
828 (* New size in sectors. *)
829 let size = (newsize +^ sectsize -^ 1L) /^ sectsize in
830 (* Start of next partition + alignment. *)
831 let next = start +^ size in
832 let next = (next +^ 127L) &^ (~^ 127L) in
834 { p with p_target_start = start; p_target_end = next -^ 1L;
835 p_target_partnum = partnum } :: loop (partnum+1) next ps
839 (* Create the surplus partition if there is room for it. *)
840 if extra_partition && surplus >= min_extra_partition then (
842 (* Since this partition has no source, this data is
843 * meaningless and not used since the operation is
847 p_part = { G.part_num = 0l; part_start = 0L; part_end = 0L;
849 p_bootable = false; p_mbr_id = None; p_type = ContentUnknown;
851 (* Target information is meaningful. *)
852 p_operation = OpIgnore;
853 p_target_partnum = partnum;
854 p_target_start = start; p_target_end = ~^ 64L
861 (* The first partition must start at the same position as the old
862 * first partition. Old virt-resize used to align this to 64
863 * sectors, but I suspect this is the cause of boot failures, so
866 let start = (List.hd partitions).p_part.G.part_start /^ sectsize in
867 loop 1 start partitions
869 (* Now partition the target disk. *)
873 g#part_add "/dev/sdb" "primary" p.p_target_start p.p_target_end;
875 (* Set bootable and MBR IDs *)
877 g#part_set_bootable "/dev/sdb" p.p_target_partnum true;
879 (match p.p_mbr_id with
882 g#part_set_mbr_id "/dev/sdb" p.p_target_partnum mbr_id
886 (* Copy over the data. *)
890 match p.p_operation with
891 | OpCopy | OpResize _ ->
892 (* XXX Old code had 'when target_partnum > 0', but it appears
893 * to have served no purpose since the field could never be 0
897 let oldsize = p.p_part.G.part_size in
899 match p.p_operation with OpResize s -> s | _ -> oldsize in
901 let copysize = if newsize < oldsize then newsize else oldsize in
903 let source = p.p_name in
904 let target = sprintf "/dev/sdb%d" p.p_target_partnum in
907 printf "Copying %s ...\n%!" source;
909 g#copy_size source target copysize;
914 (* After copying the data over we must shut down and restart the
915 * appliance in order to expand the content. The reason for this may
916 * not be obvious, but it's because otherwise we'll have duplicate VGs
917 * (the old VG(s) and the new VG(s)) which breaks LVM.
919 * The restart is only required if we're going to expand something.
924 | ({ p_operation = OpResize _ } as p) -> can_expand_content p.p_type
929 | ({ lv_operation = LVOpExpand } as lv) -> can_expand_content lv.lv_type
934 if to_be_expanded then (
939 let g = new G.guestfs () in
940 if debug then g#set_trace true;
941 g#add_drive_opts ?format:output_format ~readonly:false outfile;
942 if not quiet then Progress.set_up_progress_bar ~machine_readable g;
945 g (* Return new handle. *)
947 else g (* Return existing handle. *)
950 if to_be_expanded then (
951 (* Helper function to expand partition or LV content. *)
952 let do_expand_content target = function
953 | PVResize -> g#pvresize target
957 | NTFSResize -> g#ntfsresize_opts ~force:ntfsresize_force target
958 | BtrfsFilesystemResize ->
959 (* Complicated ... Btrfs forces us to mount the filesystem
960 * in order to resize it.
962 assert (Array.length (g#mounts ()) = 0);
963 g#mount_options "" target "/";
964 g#btrfs_filesystem_resize "/";
968 (* Expand partition content as required. *)
971 | ({ p_operation = OpResize _ } as p) when can_expand_content p.p_type ->
972 let source = p.p_name in
973 let target = sprintf "/dev/sda%d" p.p_target_partnum in
974 let meth = expand_content_method p.p_type in
977 printf "Expanding %s%s using the '%s' method ...\n%!"
979 (if source <> target then sprintf " (now %s)" target else "")
980 (string_of_expand_content_method meth);
982 do_expand_content target meth
986 (* Expand logical volume content as required. *)
989 | ({ lv_operation = LVOpExpand } as lv) when can_expand_content lv.lv_type ->
990 let name = lv.lv_name in
991 let meth = expand_content_method lv.lv_type in
994 printf "Expanding %s using the '%s' method ...\n%!"
996 (string_of_expand_content_method meth);
998 (* First expand the LV itself to maximum size. *)
999 g#lvresize_free name 100;
1001 (* Then expand the content in the LV. *)
1002 do_expand_content name meth
1007 (* Finished. Unmount disks and exit. *)
1015 wrap "Resize operation completed with no errors. Before deleting the old disk, carefully check that the resized disk boots and works correctly.\n";