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 type align_first_t = [ `Never | `Always | `Auto ]
33 let infile, outfile, align_first, alignment, copy_boot_loader, debug, deletes,
34 dryrun, expand, expand_content, extra_partition, format, ignores,
35 lv_expands, machine_readable, ntfsresize_force, output_format,
36 quiet, resizes, resizes_force, shrink =
37 let display_version () =
38 let g = new G.guestfs () in
39 let version = g#version () in
40 printf "virt-resize %Ld.%Ld.%Ld%s\n"
41 version.G.major version.G.minor version.G.release version.G.extra;
45 let add xs s = xs := s :: !xs in
47 let align_first = ref "auto" in
48 let alignment = ref 128 in
49 let copy_boot_loader = ref true in
50 let debug = ref false in
51 let deletes = ref [] in
52 let dryrun = ref false in
53 let expand = ref "" in
55 if s = "" then error "%s: empty --expand option" prog
56 else if !expand <> "" then error "--expand option given twice"
59 let expand_content = ref true in
60 let extra_partition = ref true in
61 let format = ref "" in
62 let ignores = ref [] in
63 let lv_expands = ref [] in
64 let machine_readable = ref false in
65 let ntfsresize_force = ref false in
66 let output_format = ref "" in
67 let quiet = ref false in
68 let resizes = ref [] in
69 let resizes_force = ref [] in
70 let shrink = ref "" in
72 if s = "" then error "empty --shrink option"
73 else if !shrink <> "" then error "--shrink option given twice"
77 let argspec = Arg.align [
78 "--align-first", Arg.Set_string align_first, "never|always|auto Align first partition (default: auto)";
79 "--alignment", Arg.Set_int alignment, "sectors Set partition alignment (default: 128 sectors)";
80 "--no-copy-boot-loader", Arg.Clear copy_boot_loader, " Don't copy boot loader";
81 "-d", Arg.Set debug, " Enable debugging messages";
82 "--debug", Arg.Set debug, " -\"-";
83 "--delete", Arg.String (add deletes), "part Delete partition";
84 "--expand", Arg.String set_expand, "part Expand partition";
85 "--no-expand-content", Arg.Clear expand_content, " Don't expand content";
86 "--no-extra-partition", Arg.Clear extra_partition, " Don't create extra partition";
87 "--format", Arg.Set_string format, "format Format of input disk";
88 "--ignore", Arg.String (add ignores), "part Ignore partition";
89 "--lv-expand", Arg.String (add lv_expands), "lv Expand logical volume";
90 "--LV-expand", Arg.String (add lv_expands), "lv -\"-";
91 "--lvexpand", Arg.String (add lv_expands), "lv -\"-";
92 "--LVexpand", Arg.String (add lv_expands), "lv -\"-";
93 "--machine-readable", Arg.Set machine_readable, " Make output machine readable";
94 "-n", Arg.Set dryrun, " Don't perform changes";
95 "--dryrun", Arg.Set dryrun, " -\"-";
96 "--dry-run", Arg.Set dryrun, " -\"-";
97 "--ntfsresize-force", Arg.Set ntfsresize_force, " Force ntfsresize";
98 "--output-format", Arg.Set_string format, "format Format of output disk";
99 "-q", Arg.Set quiet, " Don't print the summary";
100 "--quiet", Arg.Set quiet, " -\"-";
101 "--resize", Arg.String (add resizes), "part=size Resize partition";
102 "--resize-force", Arg.String (add resizes_force), "part=size Forcefully resize partition";
103 "--shrink", Arg.String set_shrink, "part Shrink partition";
104 "-V", Arg.Unit display_version, " Display version and exit";
105 "--version", Arg.Unit display_version, " -\"-";
107 let disks = ref [] in
108 let anon_fun s = disks := s :: !disks in
111 %s: resize a virtual machine disk
113 A short summary of the options is given below. For detailed help please
114 read the man page virt-resize(1).
117 Arg.parse argspec anon_fun usage_msg;
119 let debug = !debug in
121 eprintf "command line:";
122 List.iter (eprintf " %s") (Array.to_list Sys.argv);
126 (* Dereference the rest of the args. *)
127 let alignment = !alignment in
128 let copy_boot_loader = !copy_boot_loader in
129 let deletes = List.rev !deletes in
130 let dryrun = !dryrun in
131 let expand = match !expand with "" -> None | str -> Some str in
132 let expand_content = !expand_content in
133 let extra_partition = !extra_partition in
134 let format = match !format with "" -> None | str -> Some str in
135 let ignores = List.rev !ignores in
136 let lv_expands = List.rev !lv_expands in
137 let machine_readable = !machine_readable in
138 let ntfsresize_force = !ntfsresize_force in
139 let output_format = match !output_format with "" -> None | str -> Some str in
140 let quiet = !quiet in
141 let resizes = List.rev !resizes in
142 let resizes_force = List.rev !resizes_force in
143 let shrink = match !shrink with "" -> None | str -> Some str in
145 if alignment < 1 then
146 error "alignment cannot be < 1";
147 let alignment = Int64.of_int alignment in
150 match !align_first with
152 | "always" -> `Always
155 error "unknown --align-first option: use never|always|auto" in
157 (* No arguments and machine-readable mode? Print out some facts
158 * about what this binary supports. We only need to print out new
159 * things added since this option, or things which depend on features
162 if !disks = [] && machine_readable then (
163 printf "virt-resize\n";
164 printf "ntfsresize-force\n";
166 printf "128-sector-alignment\n";
167 printf "alignment\n";
168 printf "align-first\n";
169 let g = new G.guestfs () in
170 g#add_drive_opts "/dev/null";
172 if feature_available g [| "ntfsprogs"; "ntfs3g" |] then
174 if feature_available g [| "btrfs" |] then
179 (* Verify we got exactly 2 disks. *)
180 let infile, outfile =
181 match List.rev !disks with
182 | [infile; outfile] -> infile, outfile
184 error "usage is: %s [--options] indisk outdisk" prog in
186 infile, outfile, align_first, alignment, copy_boot_loader, debug, deletes,
187 dryrun, expand, expand_content, extra_partition, format, ignores,
188 lv_expands, machine_readable, ntfsresize_force, output_format,
189 quiet, resizes, resizes_force, shrink
191 (* Default to true, since NTFS and btrfs support are usually available. *)
192 let ntfs_available = ref true
193 let btrfs_available = ref true
195 (* Add in and out disks to the handle and launch. *)
196 let connect_both_disks () =
197 let g = new G.guestfs () in
198 if debug then g#set_trace true;
199 g#add_drive_opts ?format ~readonly:true infile;
200 g#add_drive_opts ?format:output_format ~readonly:false outfile;
201 if not quiet then Progress.set_up_progress_bar ~machine_readable g;
204 (* Set the filter to /dev/sda, in case there are any rogue
205 * PVs lying around on the target disk.
207 g#lvm_set_filter [|"/dev/sda"|];
209 (* Update features available in the daemon. *)
210 ntfs_available := feature_available g [|"ntfsprogs"; "ntfs3g"|];
211 btrfs_available := feature_available g [|"btrfs"|];
217 printf "Examining %s ...\n%!" infile;
219 let g = connect_both_disks () in
223 (* Get the size in bytes of each disk.
225 * Originally we computed this by looking at the same of the host file,
226 * but of course this failed for qcow2 images (RHBZ#633096). The right
227 * way to do it is with g#blockdev_getsize64.
229 let sectsize, insize, outsize =
230 let sectsize = g#blockdev_getss "/dev/sdb" in
231 let insize = g#blockdev_getsize64 "/dev/sda" in
232 let outsize = g#blockdev_getsize64 "/dev/sdb" in
234 eprintf "%s size %Ld bytes\n" infile insize;
235 eprintf "%s size %Ld bytes\n" outfile outsize
237 sectsize, insize, outsize
240 (* In reality the number of sectors containing boot loader data will be
241 * less than this (although Windows 7 defaults to putting the first
242 * partition on sector 2048, and has quite a large boot loader).
244 * However make this large enough to be sure that we have copied over
245 * the boot loader. We could also do this by looking for the sector
246 * offset of the first partition.
248 * It doesn't matter if we copy too much.
252 (* Check the disks are at least as big as the bootloader. *)
254 if insize < Int64.of_int max_bootloader then
255 error "%s: file is too small to be a disk image (%Ld bytes)"
257 if outsize < Int64.of_int max_bootloader then
258 error "%s: file is too small to be a disk image (%Ld bytes)"
261 (* Build a data structure describing the source disk's partition layout. *)
263 p_name : string; (* Device name, like /dev/sda1. *)
264 p_part : G.partition; (* SOURCE partition data from libguestfs. *)
265 p_bootable : bool; (* Is it bootable? *)
266 p_mbr_id : int option; (* MBR ID, if it has one. *)
267 p_type : partition_content; (* Content type and content size. *)
269 (* What we're going to do: *)
270 mutable p_operation : partition_operation;
271 p_target_partnum : int; (* TARGET partition number. *)
272 p_target_start : int64; (* TARGET partition start (sector num). *)
273 p_target_end : int64; (* TARGET partition end (sector num). *)
275 and partition_content =
276 | ContentUnknown (* undetermined *)
277 | ContentPV of int64 (* physical volume (size of PV) *)
278 | ContentFS of string * int64 (* mountable filesystem (FS type, FS size) *)
279 and partition_operation =
280 | OpCopy (* copy it as-is, no resizing *)
281 | OpIgnore (* ignore it (create on target, but don't
283 | OpDelete (* delete it *)
284 | OpResize of int64 (* resize it to the new size *)
286 let rec debug_partition p =
287 eprintf "%s:\n" p.p_name;
288 eprintf "\tpartition data: %ld %Ld-%Ld (%Ld bytes)\n"
289 p.p_part.G.part_num p.p_part.G.part_start p.p_part.G.part_end
290 p.p_part.G.part_size;
291 eprintf "\tbootable: %b\n" p.p_bootable;
292 eprintf "\tpartition ID: %s\n"
293 (match p.p_mbr_id with None -> "(none)" | Some i -> sprintf "0x%x" i);
294 eprintf "\tcontent: %s\n" (string_of_partition_content p.p_type)
295 and string_of_partition_content = function
296 | ContentUnknown -> "unknown data"
297 | ContentPV sz -> sprintf "LVM PV (%Ld bytes)" sz
298 | ContentFS (fs, sz) -> sprintf "filesystem %s (%Ld bytes)" fs sz
299 and string_of_partition_content_no_size = function
300 | ContentUnknown -> "unknown data"
301 | ContentPV _ -> sprintf "LVM PV"
302 | ContentFS (fs, _) -> sprintf "filesystem %s" fs
304 let get_partition_content =
305 let pvs_full = Array.to_list (g#pvs_full ()) in
308 let fs = g#vfs_type dev in
309 if fs = "unknown" then
311 else if fs = "LVM2_member" then (
312 let rec loop = function
314 error "%s: physical volume not returned by pvs_full"
316 | pv :: _ when canonicalize pv.G.pv_name = dev ->
317 ContentPV pv.G.pv_size
318 | _ :: pvs -> loop pvs
324 let stat = g#statvfs "/" in
325 let size = stat.G.bsize *^ stat.G.blocks in
329 G.Error _ -> ContentUnknown
331 let partitions : partition list =
332 let parts = Array.to_list (g#part_list "/dev/sda") in
334 if List.length parts = 0 then
335 error "the source disk has no partitions";
339 fun ({ G.part_num = part_num } as part) ->
340 let part_num = Int32.to_int part_num in
341 let name = sprintf "/dev/sda%d" part_num in
342 let bootable = g#part_get_bootable "/dev/sda" part_num in
344 try Some (g#part_get_mbr_id "/dev/sda" part_num)
345 with G.Error _ -> None in
346 let typ = get_partition_content name in
348 { p_name = name; p_part = part;
349 p_bootable = bootable; p_mbr_id = mbr_id; p_type = typ;
350 p_operation = OpCopy; p_target_partnum = 0;
351 p_target_start = 0L; p_target_end = 0L }
355 eprintf "%d partitions found\n" (List.length partitions);
356 List.iter debug_partition partitions
359 (* Check content isn't larger than partitions. If it is then
360 * something has gone wrong and we shouldn't continue. Old
361 * virt-resize didn't do these checks.
365 | { p_name = name; p_part = { G.part_size = size };
366 p_type = ContentPV pv_size }
367 when size < pv_size ->
368 error "%s: partition size %Ld < physical volume size %Ld"
370 | { p_name = name; p_part = { G.part_size = size };
371 p_type = ContentFS (_, fs_size) }
372 when size < fs_size ->
373 error "%s: partition size %Ld < filesystem size %Ld"
378 (* Check partitions don't overlap. *)
379 let rec loop end_of_prev = function
381 | { p_name = name; p_part = { G.part_start = part_start } } :: _
382 when end_of_prev > part_start ->
383 error "%s: this partition overlaps the previous one" name
384 | { p_part = { G.part_end = part_end } } :: parts -> loop part_end parts
390 (* Build a data structure describing LVs on the source disk.
391 * This is only used if the user gave the --lv-expand option.
395 lv_type : logvol_content;
396 mutable lv_operation : logvol_operation
398 and logvol_content = partition_content (* except ContentPV cannot occur *)
399 and logvol_operation =
400 | LVOpNone (* nothing *)
401 | LVOpExpand (* expand it *)
403 let debug_logvol lv =
404 eprintf "%s:\n" lv.lv_name;
405 eprintf "\tcontent: %s\n" (string_of_partition_content lv.lv_type)
408 let lvs = Array.to_list (g#lvs ()) in
412 let typ = get_partition_content name in
413 assert (match typ with ContentPV _ -> false | _ -> true);
415 { lv_name = name; lv_type = typ; lv_operation = LVOpNone }
419 eprintf "%d logical volumes found\n" (List.length lvs);
420 List.iter debug_logvol lvs
425 (* These functions tell us if we know how to expand the content of
426 * a particular partition or LV, and what method to use.
428 type expand_content_method =
429 | PVResize | Resize2fs | NTFSResize | BtrfsFilesystemResize
431 let string_of_expand_content_method = function
432 | PVResize -> "pvresize"
433 | Resize2fs -> "resize2fs"
434 | NTFSResize -> "ntfsresize"
435 | BtrfsFilesystemResize -> "btrfs-filesystem-resize"
437 let can_expand_content =
438 if expand_content then
440 | ContentUnknown -> false
441 | ContentPV _ -> true
442 | ContentFS (("ext2"|"ext3"|"ext4"), _) -> true
443 | ContentFS (("ntfs"), _) when !ntfs_available -> true
444 | ContentFS (("btrfs"), _) when !btrfs_available -> true
445 | ContentFS (_, _) -> false
449 let expand_content_method =
450 if expand_content then
452 | ContentUnknown -> assert false
453 | ContentPV _ -> PVResize
454 | ContentFS (("ext2"|"ext3"|"ext4"), _) -> Resize2fs
455 | ContentFS (("ntfs"), _) when !ntfs_available -> NTFSResize
456 | ContentFS (("btrfs"), _) when !btrfs_available -> BtrfsFilesystemResize
457 | ContentFS (_, _) -> assert false
459 fun _ -> assert false
461 (* Helper function to locate a partition given what the user might
462 * type on the command line. It also gives errors for partitions
463 * that the user has asked to be ignored or deleted.
466 let hash = Hashtbl.create 13 in
467 List.iter (fun ({ p_name = name } as p) -> Hashtbl.add hash name p)
471 if String.length name < 5 || String.sub name 0 5 <> "/dev/" then
475 let name = canonicalize name in
478 try Hashtbl.find hash name
480 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"
481 name option infile in
483 if partition.p_operation = OpIgnore then
484 error "%s: partition already ignored, you cannot use it in '%s' option"
487 if partition.p_operation = OpDelete then
488 error "%s: partition already deleted, you cannot use it in '%s' option"
493 (* Handle --ignore option. *)
497 let p = find_partition ~option:"--ignore" dev in
498 p.p_operation <- OpIgnore
501 (* Handle --delete option. *)
505 let p = find_partition ~option:"--delete" dev in
506 p.p_operation <- OpDelete
509 (* Helper function to mark a partition for resizing. It prevents the
510 * user from trying to mark the same partition twice. If the force
511 * flag is given, then we will allow the user to shrink the partition
512 * even if we think that would destroy the content.
514 let mark_partition_for_resize ~option ?(force = false) p newsize =
515 let name = p.p_name in
516 let oldsize = p.p_part.G.part_size in
518 (match p.p_operation with
520 error "%s: this partition has already been marked for resizing"
522 | OpIgnore | OpDelete ->
523 (* This error should have been caught already by find_partition ... *)
524 error "%s: this partition has already been ignored or deleted"
529 (* Only do something if the size will change. *)
530 if oldsize <> newsize then (
531 let bigger = newsize > oldsize in
533 if not bigger && not force then (
534 (* Check if this contains filesystem content, and how big that is
535 * and whether we will destroy any content by shrinking this.
539 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.)"
541 | ContentPV size when size > newsize ->
542 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.)"
543 name size newsize option
545 | ContentFS (fstype, size) when size > newsize ->
546 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.)"
547 name fstype size newsize option
551 p.p_operation <- OpResize newsize
554 (* Handle --resize and --resize-force options. *)
556 let do_resize ~option ?(force = false) arg =
557 (* Argument is "dev=size". *)
560 let i = String.index arg '=' in
561 let n = String.length arg - (i+1) in
562 if n == 0 then raise Not_found;
563 String.sub arg 0 i, String.sub arg (i+1) n
565 error "%s: missing size field in '%s' option" arg option in
567 let p = find_partition ~option dev in
569 (* Parse the size field. *)
570 let oldsize = p.p_part.G.part_size in
571 let newsize = parse_size oldsize sizefield in
573 if newsize <= 0L then
574 error "%s: new partition size is zero or negative" dev;
576 mark_partition_for_resize ~option ~force p newsize
579 List.iter (do_resize ~option:"--resize") resizes;
580 List.iter (do_resize ~option:"--resize-force" ~force:true) resizes_force
582 (* Helper function calculates the surplus space, given the total
583 * required so far for the current partition layout, compared to
584 * the size of the target disk. If the return value >= 0 then it's
585 * a surplus, if it is < 0 then it's a deficit.
587 let calculate_surplus () =
588 (* We need some overhead for partitioning. Worst case would be for
589 * EFI partitioning + massive per-partition alignment.
591 let nr_partitions = List.length partitions in
592 let overhead = (Int64.of_int sectsize) *^ (
593 2L *^ 64L +^ (* GPT start and end *)
594 (alignment *^ (Int64.of_int (nr_partitions + 1))) (* Maximum alignment *)
596 (Int64.of_int (max_bootloader - 64 * 512)) in (* Bootloader *)
598 let required = List.fold_left (
601 match p.p_operation with
602 | OpCopy | OpIgnore -> p.p_part.G.part_size
604 | OpResize newsize -> newsize in
608 outsize -^ (required +^ overhead)
610 (* Handle --expand and --shrink options. *)
612 if expand <> None && shrink <> None then
613 error "you cannot use options --expand and --shrink together";
615 if expand <> None || shrink <> None then (
616 let surplus = calculate_surplus () in
619 eprintf "surplus before --expand or --shrink: %Ld\n" surplus;
625 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."
626 (human_size (Int64.neg surplus));
628 let option = "--expand" in
629 let p = find_partition ~option dev in
630 let oldsize = p.p_part.G.part_size in
631 mark_partition_for_resize ~option p (oldsize +^ surplus)
637 error "You cannot use --shrink when there is no deficit (see 'deficit' in the virt-resize(1) man page).";
639 let option = "--shrink" in
640 let p = find_partition ~option dev in
641 let oldsize = p.p_part.G.part_size in
642 mark_partition_for_resize ~option p (oldsize +^ surplus)
646 (* Calculate the final surplus.
647 * At this point, this number must be >= 0.
650 let surplus = calculate_surplus () in
652 if surplus < 0L then (
653 let deficit = Int64.neg surplus in
654 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."
655 deficit (human_size deficit)
660 (* Mark the --lv-expand LVs. *)
662 let hash = Hashtbl.create 13 in
663 List.iter (fun ({ lv_name = name } as lv) -> Hashtbl.add hash name lv) lvs;
668 try Hashtbl.find hash name
670 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"
672 lv.lv_operation <- LVOpExpand
675 (* Print a summary of what we will do. *)
680 printf "**********\n\n";
681 printf "Summary of changes:\n\n";
684 fun ({ p_name = name; p_part = { G.part_size = oldsize }} as p) ->
686 match p.p_operation with
688 sprintf "%s: This partition will be left alone." name
690 sprintf "%s: This partition will be created, but the contents will be ignored (ie. not copied to the target)." name
692 sprintf "%s: This partition will be deleted." name
693 | OpResize newsize ->
694 sprintf "%s: This partition will be resized from %s to %s."
695 name (human_size oldsize) (human_size newsize) ^
696 if can_expand_content p.p_type then (
697 sprintf " The %s on %s will be expanded using the '%s' method."
698 (string_of_partition_content_no_size p.p_type)
700 (string_of_expand_content_method
701 (expand_content_method p.p_type))
704 wrap ~hanging:4 (text ^ "\n\n")
708 fun ({ lv_name = name } as lv) ->
709 match lv.lv_operation with
713 sprintf "%s: This logical volume will be expanded to maximum size."
715 if can_expand_content lv.lv_type then (
716 sprintf " The %s on %s will be expanded using the '%s' method."
717 (string_of_partition_content_no_size lv.lv_type)
719 (string_of_expand_content_method
720 (expand_content_method lv.lv_type))
723 wrap ~hanging:4 (text ^ "\n\n")
726 if surplus > 0L then (
728 sprintf "There is a surplus of %s." (human_size surplus) ^
729 if extra_partition then (
730 if surplus >= min_extra_partition then
731 sprintf " An extra partition will be created for the surplus."
733 sprintf " The surplus space is not large enough for an extra partition to be created and so it will just be ignored."
735 sprintf " The surplus space will be ignored. Run a partitioning program in the guest to partition this extra space if you want." in
740 printf "**********\n";
744 if dryrun then exit 0
746 (* Create a partition table.
748 * We *must* do this before copying the bootloader across, and copying
749 * the bootloader must be careful not to disturb this partition table
750 * (RHBZ#633766). There are two reasons for this:
752 * (1) The 'parted' library is stupid and broken. In many ways. In
753 * this particular instance the stupid and broken bit is that it
754 * overwrites the whole boot sector when initializating a partition
755 * table. (Upstream don't consider this obvious problem to be a bug).
757 * (2) GPT has a backup partition table located at the end of the disk.
758 * It's non-movable, because the primary GPT contains fixed references
759 * to both the size of the disk and the backup partition table at the
760 * end. This would be a problem for any resize that didn't either
761 * carefully move the backup GPT (and rewrite those references) or
762 * recreate the whole partition table from scratch.
765 let parttype = g#part_get_parttype "/dev/sda" in
766 if debug then eprintf "partition table type: %s\n%!" parttype;
768 (* Try hard to initialize the partition table. This might involve
769 * relaunching another handle.
772 printf "Setting up initial partition table on %s ...\n%!" outfile;
774 let last_error = ref "" in
775 let rec initialize_partition_table g attempts =
777 try g#part_init "/dev/sdb" parttype; true
778 with G.Error error -> last_error := error; false in
780 else if attempts > 0 then (
785 let g = connect_both_disks () in
786 initialize_partition_table g (attempts-1)
791 let g, ok = initialize_partition_table g 5 in
793 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;
797 (* Copy the bootloader across.
798 * Don't disturb the partition table that we just wrote.
799 * https://secure.wikimedia.org/wikipedia/en/wiki/Master_Boot_Record
800 * https://secure.wikimedia.org/wikipedia/en/wiki/GUID_Partition_Table
803 if copy_boot_loader then (
804 let bootsect = g#pread_device "/dev/sda" 446 0L in
805 if String.length bootsect < 446 then
806 error "pread-device: short read";
807 ignore (g#pwrite_device "/dev/sdb" bootsect 0L);
810 if parttype <> "gpt" then 512L
812 (* XXX With 4K sectors does GPT just fit more entries in a
813 * sector, or does it always use 34 sectors?
817 let loader = g#pread_device "/dev/sda" max_bootloader start in
818 if String.length loader < max_bootloader then
819 error "pread-device: short read";
820 ignore (g#pwrite_device "/dev/sdb" loader start)
823 (* Are we going to align the first partition and fix the bootloader? *)
824 let align_first_partition_and_fix_bootloader =
825 (* Bootloaders that we know how to fix. *)
826 let can_fix_boot_loader =
827 match partitions with
828 | { p_type = ContentFS ("ntfs", _); p_bootable = true;
829 p_operation = OpCopy | OpIgnore | OpResize _ } :: _ -> true
833 match align_first, can_fix_boot_loader with
835 | `Auto, false -> false
837 | `Auto, true -> true
839 (* Repartition the target disk. *)
841 (* Calculate the location of the partitions on the target disk. This
842 * also removes from the list any partitions that will be deleted, so
843 * the final list just contains partitions that need to be created
847 let sectsize = Int64.of_int sectsize in
849 (* Return 'i' rounded up to the next multiple of 'a'. *)
850 let roundup64 i a = let a = a -^ 1L in (i +^ a) &^ (~^ a) in
852 let rec loop partnum start = function
854 (match p.p_operation with
855 | OpDelete -> loop partnum start ps (* skip p *)
857 | OpIgnore | OpCopy -> (* same size *)
858 (* Size in sectors. *)
859 let size = (p.p_part.G.part_size +^ sectsize -^ 1L) /^ sectsize in
860 (* Start of next partition + alignment. *)
861 let end_ = start +^ size in
862 let next = roundup64 end_ alignment in
864 { p with p_target_start = start; p_target_end = end_ -^ 1L;
865 p_target_partnum = partnum } :: loop (partnum+1) next ps
867 | OpResize newsize -> (* resized partition *)
868 (* New size in sectors. *)
869 let size = (newsize +^ sectsize -^ 1L) /^ sectsize in
870 (* Start of next partition + alignment. *)
871 let next = start +^ size in
872 let next = roundup64 next alignment in
874 { p with p_target_start = start; p_target_end = next -^ 1L;
875 p_target_partnum = partnum } :: loop (partnum+1) next ps
879 (* Create the surplus partition if there is room for it. *)
880 if extra_partition && surplus >= min_extra_partition then (
882 (* Since this partition has no source, this data is
883 * meaningless and not used since the operation is
887 p_part = { G.part_num = 0l; part_start = 0L; part_end = 0L;
889 p_bootable = false; p_mbr_id = None; p_type = ContentUnknown;
891 (* Target information is meaningful. *)
892 p_operation = OpIgnore;
893 p_target_partnum = partnum;
894 p_target_start = start; p_target_end = ~^ 64L
901 (* Choose the alignment of the first partition based on the
902 * '--align-first' option. Old virt-resize used to always align this
903 * to 64 sectors, but this causes boot failures unless we are able to
904 * adjust the bootloader accordingly.
907 if align_first_partition_and_fix_bootloader then
910 (* Preserve the existing start, but convert to sectors. *)
911 (List.hd partitions).p_part.G.part_start /^ sectsize in
913 loop 1 start partitions
915 (* Now partition the target disk. *)
919 g#part_add "/dev/sdb" "primary" p.p_target_start p.p_target_end;
921 (* Set bootable and MBR IDs *)
923 g#part_set_bootable "/dev/sdb" p.p_target_partnum true;
925 (match p.p_mbr_id with
928 g#part_set_mbr_id "/dev/sdb" p.p_target_partnum mbr_id
932 (* Copy over the data. *)
936 match p.p_operation with
937 | OpCopy | OpResize _ ->
938 (* XXX Old code had 'when target_partnum > 0', but it appears
939 * to have served no purpose since the field could never be 0
943 let oldsize = p.p_part.G.part_size in
945 match p.p_operation with OpResize s -> s | _ -> oldsize in
947 let copysize = if newsize < oldsize then newsize else oldsize in
949 let source = p.p_name in
950 let target = sprintf "/dev/sdb%d" p.p_target_partnum in
953 printf "Copying %s ...\n%!" source;
955 g#copy_size source target copysize;
960 (* Fix the bootloader if we aligned the first partition. *)
962 if align_first_partition_and_fix_bootloader then (
963 (* See can_fix_boot_loader above. *)
964 match partitions with
965 | { p_type = ContentFS ("ntfs", _); p_bootable = true;
966 p_target_partnum = partnum; p_target_start = start } :: _ ->
967 (* If the first partition is NTFS and bootable, set the "Number of
968 * Hidden Sectors" field in the NTFS Boot Record so that the
969 * filesystem is still bootable.
972 (* Should always be /dev/sdb1? *)
973 let target = sprintf "/dev/sdb%d" partnum in
975 (* Sanity check: it contains the NTFS magic. *)
976 let magic = g#pread_device target 8 3L in
977 if magic <> "NTFS " then
978 eprintf "warning: first partition is NTFS but does not contain NTFS boot loader magic\n%!"
981 printf "Fixing first NTFS partition boot record ...\n%!";
984 let old_hidden = int_of_le32 (g#pread_device target 4 0x1c_L) in
985 eprintf "old hidden sectors value: 0x%Lx\n%!" old_hidden
988 let new_hidden = le32_of_int start in
989 ignore (g#pwrite_device target new_hidden 0x1c_L)
995 (* After copying the data over we must shut down and restart the
996 * appliance in order to expand the content. The reason for this may
997 * not be obvious, but it's because otherwise we'll have duplicate VGs
998 * (the old VG(s) and the new VG(s)) which breaks LVM.
1000 * The restart is only required if we're going to expand something.
1002 let to_be_expanded =
1005 | ({ p_operation = OpResize _ } as p) -> can_expand_content p.p_type
1010 | ({ lv_operation = LVOpExpand } as lv) -> can_expand_content lv.lv_type
1015 if to_be_expanded then (
1020 let g = new G.guestfs () in
1021 if debug then g#set_trace true;
1022 g#add_drive_opts ?format:output_format ~readonly:false outfile;
1023 if not quiet then Progress.set_up_progress_bar ~machine_readable g;
1026 g (* Return new handle. *)
1028 else g (* Return existing handle. *)
1031 if to_be_expanded then (
1032 (* Helper function to expand partition or LV content. *)
1033 let do_expand_content target = function
1034 | PVResize -> g#pvresize target
1038 | NTFSResize -> g#ntfsresize_opts ~force:ntfsresize_force target
1039 | BtrfsFilesystemResize ->
1040 (* Complicated ... Btrfs forces us to mount the filesystem
1041 * in order to resize it.
1043 assert (Array.length (g#mounts ()) = 0);
1044 g#mount_options "" target "/";
1045 g#btrfs_filesystem_resize "/";
1049 (* Expand partition content as required. *)
1052 | ({ p_operation = OpResize _ } as p) when can_expand_content p.p_type ->
1053 let source = p.p_name in
1054 let target = sprintf "/dev/sda%d" p.p_target_partnum in
1055 let meth = expand_content_method p.p_type in
1058 printf "Expanding %s%s using the '%s' method ...\n%!"
1060 (if source <> target then sprintf " (now %s)" target else "")
1061 (string_of_expand_content_method meth);
1063 do_expand_content target meth
1067 (* Expand logical volume content as required. *)
1070 | ({ lv_operation = LVOpExpand } as lv) when can_expand_content lv.lv_type ->
1071 let name = lv.lv_name in
1072 let meth = expand_content_method lv.lv_type in
1075 printf "Expanding %s using the '%s' method ...\n%!"
1077 (string_of_expand_content_method meth);
1079 (* First expand the LV itself to maximum size. *)
1080 g#lvresize_free name 100;
1082 (* Then expand the content in the LV. *)
1083 do_expand_content name meth
1088 (* Finished. Unmount disks and exit. *)
1096 wrap "Resize operation completed with no errors. Before deleting the old disk, carefully check that the resized disk boots and works correctly.\n";