1 #!/usr/bin/ocamlrun /usr/bin/ocaml
7 #directory "+xml-light";;
8 #load "xml-light.cma";;
10 (* virt-p2v.ml is a script which performs a physical to
11 * virtual conversion of local disks.
13 * Copyright (C) 2007-2008 Red Hat Inc.
14 * Written by Richard W.M. Jones <rjones@redhat.com>
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
36 type state = { greeting : bool;
37 remote_host : string option; remote_port : string option;
38 remote_directory : string option;
39 network : network option;
40 devices_to_send : string list option;
41 root_filesystem : partition option;
42 hypervisor : hypervisor option;
43 architecture : architecture option;
44 memory : int option; vcpus : int option;
45 mac_address : string option;
47 and network = Auto | Shell
48 and partition = Part of string * string (* eg. "hda", "1" *)
49 | LV of string * string (* eg. "VolGroup00", "LogVol00" *)
50 and hypervisor = Xen | QEMU | KVM
51 and architecture = I386 | X86_64 | IA64 | PPC | PPC64 | SPARC | SPARC64
52 | OtherArch of string | UnknownArch
54 (*----------------------------------------------------------------------*)
55 (* TO MAKE A CUSTOM virt-p2v SCRIPT, adjust the defaults in this section.
57 * If left as they are, then this will create a generic virt-p2v script
58 * which asks the user for each question. If you set the defaults here
59 * then you will get a custom virt-p2v which is partially or even fully
60 * automated and won't ask the user any questions.
62 * Note that 'None' means 'no default' (ie. ask the user) whereas
63 * 'Some foo' means use 'foo' as the answer.
66 (* If greeting is true, wait for keypress after boot and during
67 * final verification. Set to 'false' for less interactions.
71 (* Remote host and port. Set to 'Some "host"' and 'Some "port"',
77 (* Remote directory. Set to 'Some "path"' to set up a
78 * directory path, else ask the user.
80 remote_directory = None;
82 (* List of devices to send. Set to 'Some ["sda"; "sdb"]' for
83 * example to select /dev/sda and /dev/sdb.
85 devices_to_send = None;
87 (* The root filesystem containing /etc/fstab. Set to
88 * 'Some (Part ("sda", "3"))' or 'Some (LV ("VolGroup00", "LogVol00"))'
89 * for example, else ask user.
91 root_filesystem = None;
93 (* Network configuration: Set to 'Some Auto' (try to set it up
94 * automatically, or 'Some Shell' (give the user a shell).
98 (* Hypervisor: Set to 'Some Xen', 'Some QEMU' or 'Some KVM'. *)
101 (* Architecture: Set to 'Some X86_64' (or another architecture).
102 * If set to 'Some UnknownArch' then we try to autodetect the
103 * right architecture.
107 (* Memory: Set to 'Some nn' with nn in megabytes. If set to 'Some 0'
108 * then we use same amount of RAM as installed in the physical machine.
112 (* Virtual CPUs: Set to 'Some nn' where nn is the number of virtual CPUs.
113 * If set to 'Some 0' then we use the same as physical CPUs in the
118 (* MAC address: Set to 'Some "aa:bb:cc:dd:ee:ff"' where the string is
119 * the MAC address of the emulated network card. Set to 'Some ""' to
120 * choose a random MAC address.
124 (* END OF CUSTOM virt-p2v SCRIPT SECTION. *)
125 (*----------------------------------------------------------------------*)
127 (* General helper functions. *)
129 let sort_uniq ?(cmp = compare) xs = (* sort and uniq a list *)
130 let xs = List.sort ~cmp xs in
131 let rec loop = function
132 | [] -> [] | [x] -> [x]
133 | x1 :: x2 :: xs when x1 = x2 -> loop (x1 :: xs)
134 | x :: xs -> x :: loop xs
138 let input_all_lines chan =
139 let lines = ref [] in
141 while true do lines := input_line chan :: !lines done; []
143 End_of_file -> List.rev !lines
145 let dev_of_partition = function
146 | Part (dev, partnum) -> sprintf "/dev/%s%s" dev partnum
147 | LV (vg, lv) -> sprintf "/dev/%s/%s" vg lv
149 let string_of_architecture = function
156 | SPARC64 -> "sparc64"
157 | OtherArch arch -> arch
160 type dialog_status = Yes of string list | No | Help | Back | Error
162 type ask_result = Next of state | Prev | Ask_again
164 type nature = LinuxSwap
165 | LinuxRoot of architecture * linux_distro
166 | WindowsRoot (* Windows C: *)
167 | LinuxBoot (* Linux /boot *)
168 | NotRoot (* mountable, but not / or /boot *)
170 and linux_distro = RHEL of int * int
172 | Debian of int * int
175 let rec string_of_nature = function
176 | LinuxSwap -> "Linux swap"
177 | LinuxRoot (architecture, distro) ->
178 string_of_linux_distro distro ^ " " ^ string_of_architecture architecture
179 | WindowsRoot -> "Windows root"
180 | LinuxBoot -> "Linux /boot"
181 | NotRoot -> "Mountable non-root"
182 | UnknownNature -> "Unknown"
183 and string_of_linux_distro = function
184 | RHEL (a,b) -> sprintf "RHEL %d.%d" a b
185 | Fedora v -> sprintf "Fedora %d" v
186 | Debian (a,b) -> sprintf "Debian %d.%d" a b
187 | OtherLinux -> "Linux"
191 * Each function takes some common parameters (eg. ~title) and some
192 * dialog-specific parameters.
194 * Returns the exit status (Yes lines | No | Help | Back | Error).
196 let msgbox, yesno, inputbox, radiolist, checklist =
197 (* Internal function to actually run the "dialog" shell command. *)
198 let run_dialog cparams params =
199 let params = cparams @ params in
200 eprintf "dialog %s\n%!"
201 (String.concat " " (List.map (sprintf "%S") params));
203 (* 'dialog' writes its output/result to stderr, so we need to take
204 * special steps to capture that - in other words, manual pipe/fork.
206 let rfd, wfd = pipe () in
208 | 0 -> (* child, runs dialog *)
210 dup2 wfd stderr; (* capture stderr to pipe *)
211 execvp "dialog" (Array.of_list ("dialog" :: params))
212 | pid -> (* parent *)
214 let chan = in_channel_of_descr rfd in
215 let result = input_all_lines chan in
217 eprintf "dialog result: %S\n%!" (String.concat "\n" result);
218 match snd (wait ()) with
219 | WEXITED 0 -> Yes result (* something selected / entered *)
220 | WEXITED 1 -> No (* cancel / no button *)
221 | WEXITED 2 -> Help (* help pressed *)
222 | WEXITED 3 -> Back (* back button *)
223 | WEXITED _ -> Error (* error or Esc *)
224 | WSIGNALED i -> failwith (sprintf "dialog: killed by signal %d" i)
225 | WSTOPPED i -> failwith (sprintf "dialog: stopped by signal %d" i)
228 (* Handle the common parameters. Note Continuation Passing Style. *)
229 let with_common cont ?(cancel=false) ?(backbutton=true) title =
230 let params = ["--title"; title] in
231 let params = if not cancel then "--nocancel" :: params else params in
233 if backbutton then "--extra-button" :: "--extra-label" :: "Back" :: params
238 (* Message box and yes/no box. *)
241 fun cparams text height width ->
243 [ "--msgbox"; text; string_of_int height; string_of_int width ]
247 fun cparams text height width ->
249 [ "--yesno"; text; string_of_int height; string_of_int width ]
252 (* Simple input box. *)
255 fun cparams text height width default ->
257 [ "--inputbox"; text; string_of_int height; string_of_int width;
261 (* Radio list and check list. *)
264 fun cparams text height width listheight items ->
265 let items = List.map (
267 | tag, item, true -> [ tag; item; "on" ]
268 | tag, item, false -> [ tag; item; "off" ]
270 let items = List.concat items in
271 let items = "--single-quoted" ::
272 "--radiolist" :: text ::
273 string_of_int height :: string_of_int width ::
274 string_of_int listheight :: items in
275 run_dialog cparams items
279 fun cparams text height width listheight items ->
280 let items = List.map (
282 | tag, item, true -> [ tag; item; "on" ]
283 | tag, item, false -> [ tag; item; "off" ]
285 let items = List.concat items in
286 let items = "--separate-output" ::
287 "--checklist" :: text ::
288 string_of_int height :: string_of_int width ::
289 string_of_int listheight :: items in
290 run_dialog cparams items
293 msgbox, yesno, inputbox, radiolist, checklist
295 (* Print failure dialog and exit. *)
296 let fail_dialog text =
297 let text = "\n" ^ text ^ "\n\nIf you want to report this error, there is a shell on [ALT] [F2], log in as root with no password.\n\nPlease provide the contents of /tmp/virt-p2v.log and output of the 'dmesg' command." in
298 ignore (msgbox "Error" text 17 50);
301 (* Shell-safe quoting function. In fact there's one in stdlib so use it. *)
302 let quote = Filename.quote
304 (* Run a shell command and check it returns 0. *)
306 eprintf "sh: %s\n%!" cmd;
307 if Sys.command cmd <> 0 then fail_dialog (sprintf "Command failed:\n\n%s" cmd)
310 eprintf "shfailok: %s\n%!" cmd;
311 ignore (Sys.command cmd)
313 let shwithstatus cmd =
314 eprintf "shwithstatus: %s\n%!" cmd;
317 (* Same as `cmd` in shell. Any error message will be in the logfile. *)
319 eprintf "shget: %s\n%!" cmd;
320 let chan = open_process_in cmd in
321 let lines = input_all_lines chan in
322 match close_process_in chan with
323 | WEXITED 0 -> Some lines (* command succeeded *)
324 | WEXITED _ -> None (* command failed *)
325 | WSIGNALED i -> failwith (sprintf "shget: command killed by signal %d" i)
326 | WSTOPPED i -> failwith (sprintf "shget: command stopped by signal %d" i)
328 (* Start an interactive shell. Need to juggle file descriptors a bit
329 * because bash write PS1 to stderr (currently directed to the logfile).
333 | 0 -> (* child, runs bash *)
336 (* Sys.command runs 'sh -c' which blows away PS1, so set it late. *)
338 Sys.command "PS1='\\u@\\h:\\w\\$ ' /bin/bash --norc --noprofile -i"
340 | _ -> (* parent, waits *)
341 eprintf "waiting for subshell to exit\n%!";
344 (* Some true if is dir/file, Some false if not, None if not found. *)
346 try Some ((stat path).st_kind = S_DIR)
347 with Unix_error (ENOENT, "stat", _) -> None
349 try Some ((stat path).st_kind = S_REG)
350 with Unix_error (ENOENT, "stat", _) -> None
352 (* Useful regular expression. *)
353 let whitespace = Pcre.regexp "[ \t]+"
355 (* Generate a predictable safe name containing only letters, numbers
356 * and underscores. If passed a string with no letters or numbers,
357 * generates "_1", "_2", etc.
362 fun () -> incr i; "_" ^ string_of_int !i
365 let is_safe = function 'a'..'z'|'A'..'Z'|'0'..'9' -> true | _ -> false in
366 let name = String.copy name in
367 let have_safe = ref false in
368 for i = 0 to String.length name - 1 do
369 if not (is_safe name.[i]) then name.[i] <- '_' else have_safe := true
371 if !have_safe then name else next_anon ()
373 type block_device = string * int64 (* "hda" & size in bytes *)
375 (* Parse the output of 'lvs' to get list of LV names, sizes,
376 * corresponding PVs, etc. Returns a list of (lvname, PVs, lvsize).
379 let devname = Pcre.regexp "^/dev/(.+)\\(.+\\)$" in
383 shget "lvs --noheadings -o vg_name,lv_name,devices,lv_size"
387 let lines = List.map (Pcre.split ~rex:whitespace) lines in
390 | [vg; lv; pvs; lvsize]
391 | [_; vg; lv; pvs; lvsize] ->
392 let pvs = String.nsplit pvs "," in
393 let pvs = List.filter_map (
396 let subs = Pcre.exec ~rex:devname pv in
397 Some (Pcre.get_substring subs 1)
400 eprintf "lvs: unexpected device name: %s\n%!" pv;
403 LV (vg, lv), pvs, lvsize
405 failwith ("lvs: unexpected output: " ^ String.concat "," line)
408 (* Get the partitions on a block device.
409 * eg. "sda" -> [Part ("sda","1"); Part ("sda", "2")]
411 let get_partitions dev =
412 let rex = Pcre.regexp ("^" ^ dev ^ "(.+)$") in
413 let devdir = "/sys/block/" ^ dev in
414 let parts = Sys.readdir devdir in
415 let parts = Array.to_list parts in
416 let parts = List.filter (
417 fun name -> Some true = is_dir (devdir ^ "/" ^ name)
419 let parts = List.filter_map (
422 let subs = Pcre.exec ~rex part in
423 Some (Part (dev, Pcre.get_substring subs 1))
429 (* Generate snapshot device name from device name. *)
430 let snapshot_name dev =
431 "snap" ^ (safe_name dev)
433 (* Perform a device-mapper snapshot with ramdisk overlay. *)
435 let next_free_ram_disk =
437 fun () -> incr i; "/dev/ram" ^ string_of_int !i
439 fun origin_dev snapshot_dev ->
440 let ramdisk = next_free_ram_disk () in
442 let cmd = "blockdev --getsz " ^ quote ("/dev/" ^ origin_dev) in
443 let lines = shget cmd in
445 | Some (sectors::_) -> Int64.of_string sectors
447 fail_dialog (sprintf "Snapshot failed - unable to read the size in sectors of block device %s" origin_dev) in
449 (* Create the snapshot origin device. Called, eg. snap_sda1_org *)
450 sh (sprintf "dmsetup create %s_org --table='0 %Ld snapshot-origin /dev/%s'"
451 snapshot_dev sectors origin_dev);
452 (* Create the snapshot. *)
453 sh (sprintf "dmsetup create %s --table='0 %Ld snapshot /dev/mapper/%s_org %s n 64'"
454 snapshot_dev sectors snapshot_dev ramdisk)
456 (* Try to perform automatic network configuration, assuming a Fedora or
457 * RHEL-like root filesystem mounted on /mnt/root.
459 let auto_network state =
460 (* Fedora gives an error if this file doesn't exist. *)
461 sh "touch /etc/resolv.conf";
464 (* We can run /mnt/root/etc/init.d/network in a chroot environment,
465 * however this won't work directly because the architecture of the
466 * binaries under /mnt/root (eg. /mnt/root/sbin/ip) might not match
467 * the architecture of the live CD kernel. In particular, a 32 bit
468 * live CD cannot run 64 bit binaries. So we also have to bind-mount
469 * the live CD's /bin, /sbin, /lib etc. over the equivalents in
473 if is_dir dir = Some true then
474 sh ("mount -o bind " ^ quote dir ^ " " ^ quote ("/mnt/root" ^ dir))
477 if is_dir dir = Some true then sh ("umount -l " ^ quote ("/mnt/root" ^ dir))
480 "/bin"; "/sbin"; "/lib"; "/lib64";
481 "/usr/bin"; "/usr/sbin"; "/usr/lib"; "/usr/lib64";
485 let status = shwithstatus "chroot /mnt/root /etc/init.d/network start" in
486 List.iter unbind dirs;
489 (* Simpler way to do the above.
490 * NB. Lazy unmount is required because dhclient keeps its current
491 * directory open on /etc/sysconfig/network-scripts/
493 sh "mount -o bind /mnt/root/etc /etc";
494 let status = shwithstatus "/etc/init.d/network start" in
497 (* Try to ping the remote host to see if this worked. *)
498 shfailok ("ping -c 3 " ^ Option.map_default quote "" state.remote_host);
500 if state.greeting then (
501 printf "\n\nDid automatic network configuration work?\n";
502 printf "Hint: If not sure, there is a shell on console [ALT] [F2]\n";
504 let line = read_line () in
505 String.length line > 0 && (line.[0] = 'y' || line.[0] = 'Y')
508 (* Non-interactive: return the status of /etc/init.d/network start. *)
511 (* Map local device names to remote devices names. At the moment we
512 * just change sd* to hd* (as device names appear under fullvirt). In
513 * future, lots of complex possibilities.
515 let remote_of_origin_dev =
516 let devsd = Pcre.regexp "^sd([[:alpha:]]+[[:digit:]]*)$" in
517 let devsd_subst = Pcre.subst "hd$1" in
519 Pcre.replace ~rex:devsd ~itempl:devsd_subst dev
521 (* Rewrite /mnt/root/etc/fstab. *)
522 let rewrite_fstab state devices_to_send =
523 let filename = "/mnt/root/etc/fstab" in
524 if is_file filename = Some true then (
525 sh ("cp " ^ quote filename ^ " " ^ quote (filename ^ ".p2vsaved"));
527 let chan = open_in filename in
528 let lines = input_all_lines chan in
530 let lines = List.map (Pcre.split ~rex:whitespace) lines in
531 let lines = List.map (
533 | dev :: rest when String.starts_with dev "/dev/" ->
534 let dev = String.sub dev 5 (String.length dev - 5) in
535 let dev = remote_of_origin_dev dev in
536 let dev = "/dev/" ^ dev in
541 let chan = open_out filename in
544 | [dev; mountpoint; fstype; options; freq; passno] ->
545 fprintf chan "%-23s %-23s %-7s %-15s %s %s\n"
546 dev mountpoint fstype options freq passno
548 output_string chan (String.concat " " line)
553 (* Main entry point. *)
554 let rec main ttyname =
555 (* Running from an init script. We don't have much of a
556 * login environment, so set one up.
560 ["/usr/sbin"; "/sbin"; "/usr/local/bin"; "/usr/kerberos/bin";
561 "/usr/bin"; "/bin"]);
562 putenv "HOME" "/root";
563 putenv "LOGNAME" "root";
565 (* We can safely write in /tmp (it's a synthetic live CD directory). *)
568 (* Set up logging to /tmp/virt-p2v.log. *)
569 let fd = openfile "virt-p2v.log" [ O_WRONLY; O_APPEND; O_CREAT ] 0o644 in
573 (* Log the start up time. *)
574 eprintf "\n\n**************************************************\n\n";
575 let tm = localtime (time ()) in
576 eprintf "virt-p2v-ng starting up at %04d-%02d-%02d %02d:%02d:%02d\n\n%!"
577 (tm.tm_year+1900) (tm.tm_mon+1) tm.tm_mday tm.tm_hour tm.tm_min tm.tm_sec;
579 (* Connect stdin/stdout to the tty. *)
583 let fd = openfile ("/dev/" ^ ttyname) [ O_RDWR ] 0 in
587 printf "virt-p2v.ml starting up ...\n%!";
589 (* Check that the environment is a sane-looking live CD. If not, bail. *)
590 if is_dir "/mnt/root" <> Some true then
592 "You should only run this script from the live CD or a USB key.";
594 printf "virt-p2v.ml detecting hard drives (this may take some time) ...\n%!";
596 (* Search for all non-removable block devices. Do this early and bail
597 * if we can't find anything. This is a list of strings, like "hda".
599 let all_block_devices : block_device list =
600 let rex = Pcre.regexp "^[hs]d" in
601 let devices = Array.to_list (Sys.readdir "/sys/block") in
602 let devices = List.sort devices in
603 let devices = List.filter (fun d -> Pcre.pmatch ~rex d) devices in
604 eprintf "all_block_devices: block devices: %s\n%!"
605 (String.concat "; " devices);
606 (* Run blockdev --getsize64 on each, and reject any where this fails
607 * (probably removable devices).
609 let devices = List.filter_map (
611 let cmd = "blockdev --getsize64 " ^ quote ("/dev/" ^ d) in
612 let lines = shget cmd in
614 | Some (blksize::_) -> Some (d, Int64.of_string blksize)
615 | Some [] | None -> None
617 eprintf "all_block_devices: non-removable block devices: %s\n%!"
619 (List.map (fun (d, b) -> sprintf "%s [%Ld]" d b) devices));
621 fail_dialog "No non-removable block devices (hard disks, etc.) could be found on this machine.";
624 (* Search for partitions and LVs (anything that could contain a
625 * filesystem directly). We refer to these generically as
628 let all_partitions : partition list =
631 let lvs = get_lvs () in
632 let pvs = List.map (fun (_, pvs, _) -> pvs) lvs in
633 let pvs = List.concat pvs in
634 let pvs = sort_uniq pvs in
635 eprintf "all_partitions: PVs: %s\n%!" (String.concat "; " pvs);
636 let lvs = List.map (fun (lvname, _, _) -> lvname) lvs in
637 eprintf "all_partitions: LVs: %s\n%!"
638 (String.concat "; " (List.map dev_of_partition lvs));
641 (* Partitions (eg. "sda1", "sda2"). *)
643 let parts = List.map fst all_block_devices in
644 let parts = List.map get_partitions parts in
645 let parts = List.concat parts in
646 eprintf "all_partitions: all partitions: %s\n%!"
647 (String.concat "; " (List.map dev_of_partition parts));
649 (* Remove any partitions which are PVs. *)
650 let parts = List.filter (
652 | Part (dev, partnum) -> not (List.mem (dev ^ partnum) pvs)
653 | LV _ -> assert false
656 eprintf "all_partitions: partitions after removing PVs: %s\n%!"
657 (String.concat "; " (List.map dev_of_partition parts));
659 (* Concatenate LVs & Parts *)
662 (* Try to determine the nature of each partition.
663 * Root? Swap? Architecture? etc.
665 let all_partitions : (partition * nature) list =
666 (* Output of 'file' command for Linux swap file. *)
667 let swap = Pcre.regexp "Linux.*swap.*file" in
668 (* Contents of /etc/redhat-release. *)
669 let rhel = Pcre.regexp "(?:Red Hat Enterprise Linux|CentOS|Scientific Linux).*release (\\d+)(?:\\.(\\d+))?" in
670 let fedora = Pcre.regexp "Fedora.*release (\\d+)" in
671 (* Contents of /etc/debian_version. *)
672 let debian = Pcre.regexp "^(\\d+)\\.(\\d+)" in
673 (* Output of 'file' on certain executables. *)
674 let i386 = Pcre.regexp ", Intel 80386," in
675 let x86_64 = Pcre.regexp ", x86-64," in
676 let itanic = Pcre.regexp ", IA-64," in
678 (* Examine the filesystem mounted on 'mnt' to determine the
679 * operating system, and, if Linux, the distro.
682 if is_dir (mnt ^ "/Windows") = Some true &&
683 is_file (mnt ^ "/autoexec.bat") = Some true then
685 else if is_dir (mnt ^ "/etc") = Some true &&
686 is_dir (mnt ^ "/sbin") = Some true &&
687 is_dir (mnt ^ "/var") = Some true then (
688 if is_file (mnt ^ "/etc/redhat-release") = Some true then (
689 let chan = open_in (mnt ^ "/etc/redhat-release") in
690 let lines = input_all_lines chan in
694 | [] -> (* empty /etc/redhat-release ...? *)
695 LinuxRoot (UnknownArch, OtherLinux)
696 | line::_ -> (* try to detect OS from /etc/redhat-release *)
698 let subs = Pcre.exec ~rex:rhel line in
699 let major = int_of_string (Pcre.get_substring subs 1) in
701 try int_of_string (Pcre.get_substring subs 2)
702 with Not_found -> 0 in
703 LinuxRoot (UnknownArch, RHEL (major, minor))
705 Not_found | Failure "int_of_string" ->
707 let subs = Pcre.exec ~rex:fedora line in
708 let version = int_of_string (Pcre.get_substring subs 1) in
709 LinuxRoot (UnknownArch, Fedora version)
711 Not_found | Failure "int_of_string" ->
712 LinuxRoot (UnknownArch, OtherLinux)
714 else if is_file (mnt ^ "/etc/debian_version") = Some true then (
715 let chan = open_in (mnt ^ "/etc/debian_version") in
716 let lines = input_all_lines chan in
720 | [] -> (* empty /etc/debian_version ...? *)
721 LinuxRoot (UnknownArch, OtherLinux)
722 | line::_ -> (* try to detect version from /etc/debian_version *)
724 let subs = Pcre.exec ~rex:debian line in
725 let major = int_of_string (Pcre.get_substring subs 1) in
726 let minor = int_of_string (Pcre.get_substring subs 2) in
727 LinuxRoot (UnknownArch, Debian (major, minor))
729 Not_found | Failure "int_of_string" ->
730 LinuxRoot (UnknownArch, OtherLinux)
733 LinuxRoot (UnknownArch, OtherLinux)
734 ) else if is_dir (mnt ^ "/grub") = Some true &&
735 is_file (mnt ^ "/grub/stage1") = Some true then (
738 NotRoot (* mountable, but not a root filesystem *)
741 (* Examine the Linux root filesystem mounted on 'mnt' to
742 * determine the architecture. We do this by looking at some
743 * well-known binaries that we expect to be there.
745 let detect_architecture mnt =
746 let cmd = "file -bL " ^ quote (mnt ^ "/sbin/init") in
748 | Some (str::_) when Pcre.pmatch ~rex:i386 str -> I386
749 | Some (str::_) when Pcre.pmatch ~rex:x86_64 str -> X86_64
750 | Some (str::_) when Pcre.pmatch ~rex:itanic str -> IA64
756 let dev = dev_of_partition part in (* Get /dev device. *)
759 (* Use 'file' command to detect if it is swap. *)
760 let cmd = "file -sbL " ^ quote dev in
762 | Some (str::_) when Pcre.pmatch ~rex:swap str -> LinuxSwap
764 (* Blindly try to mount the device. *)
765 let cmd = "mount -o ro " ^ quote dev ^ " /mnt/root" in
766 match shwithstatus cmd with
768 let os = detect_os "/mnt/root" in
771 | LinuxRoot (UnknownArch, distro) ->
772 let architecture = detect_architecture "/mnt/root" in
773 LinuxRoot (architecture, distro)
775 sh "umount /mnt/root";
778 | _ -> UnknownNature (* not mountable *)
782 eprintf "partition detection: %s is %s\n%!"
783 dev (string_of_nature nature);
789 printf "virt-p2v.ml finished detecting hard drives\n%!";
792 let ask_greeting state =
793 ignore (msgbox "virt-p2v" "\nWelcome to virt-p2v, a live CD for migrating a physical machine to a virtualized host.\n\nTo continue press the Return key.\n\nTo get a shell you can use [ALT] [F2] and log in as root with no password.\n\nExtra information is logged in /tmp/virt-p2v.log but this file disappears when the machine reboots." 18 50);
797 let ask_hostname state =
799 inputbox "Remote host" "Remote host" 10 50
800 (Option.default "" state.remote_host)
802 | Yes [] -> Ask_again
803 | Yes (hostname::_) -> Next { state with remote_host = Some hostname }
804 | No | Help | Error -> Ask_again
810 inputbox "Remote port" "Remote port" 10 50
811 (Option.default "22" state.remote_port)
813 | Yes ([]|""::_) -> Next { state with remote_port = Some "22" }
814 | Yes (port::_) -> Next { state with remote_port = Some port }
815 | No | Help | Error -> Ask_again
819 let ask_directory state =
820 let default_dir = "/var/lib/xen/images" in
822 inputbox "Remote directory" "Remote directory" 10 50
823 (Option.default default_dir state.remote_directory)
825 | Yes ([]|""::_) -> Next { state with remote_directory = Some default_dir }
826 | Yes (dir::_) -> Next { state with remote_directory = Some dir }
827 | No | Help | Error -> Ask_again
831 let ask_network state =
833 radiolist "Network configuration" "Network configuration" 10 50 2 [
834 "auto", "Automatic configuration", state.network = Some Auto;
835 "sh", "Configure from the shell", state.network = Some Shell;
838 | Yes ("auto"::_) -> Next { state with network = Some Auto }
839 | Yes ("sh"::_) -> Next { state with network = Some Shell }
840 | Yes _ | No | Help | Error -> Ask_again
844 let ask_devices state =
845 let selected_devices = Option.default [] state.devices_to_send in
846 let devices = List.map (
847 fun (dev, blksize) ->
849 sprintf "/dev/%s (%.3f GB)" dev
850 ((Int64.to_float blksize) /. (1024.*.1024.*.1024.)),
851 List.mem dev selected_devices)
852 ) all_block_devices in
854 checklist "Devices" "Pick devices to send" 15 50 8 devices
856 | Yes [] | No | Help | Error -> Ask_again
857 | Yes devices -> Next { state with devices_to_send = Some devices }
862 let parts = List.mapi (
863 fun i (part, nature) ->
866 | LinuxSwap -> " (Linux swap)"
867 | LinuxRoot (_, RHEL (a,b)) -> sprintf " (RHEL %d.%d root)" a b
868 | LinuxRoot (_, Fedora v) -> sprintf " (Fedora %d root)" v
869 | LinuxRoot (_, Debian (a,b)) -> sprintf " (Debian %d.%d root)" a b
870 | LinuxRoot (_, OtherLinux) -> sprintf " (Linux root)"
871 | WindowsRoot -> " (Windows C:)"
872 | LinuxBoot -> " (Linux /boot)"
873 | NotRoot -> " (filesystem)"
874 | UnknownNature -> "" in
876 dev_of_partition part ^ descr,
877 Some part = state.root_filesystem)
880 radiolist "Root device"
881 "Pick partition containing the root (/) filesystem" 18 70 9
885 let (part, _) = List.nth all_partitions (int_of_string i) in
886 Next { state with root_filesystem = Some part }
887 | Yes [] | No | Help | Error -> Ask_again
891 let ask_hypervisor state =
893 radiolist "Hypervisor"
894 "Choose hypervisor / virtualization system"
896 "xen", "Xen", state.hypervisor = Some Xen;
897 "qemu", "QEMU", state.hypervisor = Some QEMU;
898 "kvm", "KVM", state.hypervisor = Some KVM;
899 "other", "Other", state.hypervisor = None
902 | Yes ("xen"::_) -> Next { state with hypervisor = Some Xen }
903 | Yes ("qemu"::_) -> Next { state with hypervisor = Some QEMU }
904 | Yes ("kvm"::_) -> Next { state with hypervisor = Some KVM }
905 | Yes _ -> Next { state with hypervisor = None }
906 | No | Help | Error -> Ask_again
910 let ask_architecture state =
912 radiolist "Architecture" "Machine architecture" 16 50 8 [
913 "i386", "i386 and up (32 bit)", state.architecture = Some I386;
914 "x86_64", "x86-64 (64 bit)", state.architecture = Some X86_64;
915 "ia64", "Itanium IA64", state.architecture = Some IA64;
916 "ppc", "PowerPC (32 bit)", state.architecture = Some PPC;
917 "ppc64", "PowerPC (64 bit)", state.architecture = Some PPC64;
918 "sparc", "SPARC (32 bit)", state.architecture = Some SPARC;
919 "sparc64", "SPARC (64 bit)", state.architecture = Some SPARC64;
920 "auto", "Auto-detect",
921 state.architecture = None || state.architecture = Some UnknownArch;
924 | Yes ("i386" :: _) -> Next { state with architecture = Some I386 }
925 | Yes ("x86_64" :: _) -> Next { state with architecture = Some X86_64 }
926 | Yes ("ia64" :: _) -> Next { state with architecture = Some IA64 }
927 | Yes ("ppc" :: _) -> Next { state with architecture = Some PPC }
928 | Yes ("ppc64" :: _) -> Next { state with architecture = Some PPC64 }
929 | Yes ("sparc" :: _) -> Next { state with architecture = Some SPARC }
930 | Yes ("sparc64" :: _) -> Next { state with architecture = Some SPARC64 }
931 | Yes _ -> Next { state with architecture = Some UnknownArch }
932 | No | Help | Error -> Ask_again
936 let ask_memory state =
938 inputbox "Memory" "Memory (MB). Leave blank to use same as physical server."
940 (Option.map_default string_of_int "" state.memory)
942 | Yes (""::_ | []) -> Next { state with memory = Some 0 }
944 let mem = try int_of_string mem with Failure "int_of_string" -> -1 in
945 if mem < 0 || (mem > 0 && mem < 64) then Ask_again
946 else Next { state with memory = Some mem }
947 | No | Help | Error -> Ask_again
951 let ask_vcpus state =
953 inputbox "VCPUs" "Virtual CPUs. Leave blank to use same as physical server."
955 (Option.map_default string_of_int "" state.vcpus)
957 | Yes (""::_ | []) -> Next { state with vcpus = Some 0 }
960 try int_of_string vcpus with Failure "int_of_string" -> -1 in
961 if vcpus < 0 then Ask_again
962 else Next { state with vcpus = Some vcpus }
963 | No | Help | Error -> Ask_again
967 let ask_mac_address state =
969 inputbox "MAC address"
970 "Network MAC address. Leave blank to use a random address." 10 50
971 (Option.default "" state.mac_address)
973 | Yes (""::_ | []) -> Next { state with mac_address = Some "" }
974 | Yes (mac :: _) -> Next { state with mac_address = Some mac }
975 | No | Help | Error -> Ask_again
979 let ask_verify state =
981 yesno "Verify and proceed"
982 (sprintf "\nPlease verify the settings below and click [OK] to proceed, or the [Back] button to return to a previous step.
994 (Option.default "" state.remote_host)
995 (Option.default "" state.remote_port)
996 (Option.default "" state.remote_directory)
997 (match state.network with
998 | Some Auto -> "Auto-configure" | Some Shell -> "Shell"
1000 (String.concat "," (Option.default [] state.devices_to_send))
1001 (Option.map_default dev_of_partition "" state.root_filesystem)
1002 (match state.hypervisor with
1003 | Some Xen -> "Xen" | Some QEMU -> "QEMU" | Some KVM -> "KVM"
1004 | None -> "Other / not set")
1005 (match state.architecture with
1006 | Some UnknownArch -> "Auto-detect"
1007 | Some arch -> string_of_architecture arch | None -> "")
1008 (match state.memory with
1009 | Some 0 -> "Same as physical"
1010 | Some mem -> string_of_int mem ^ " MB" | None -> "")
1011 (match state.vcpus with
1012 | Some 0 -> "Same as physical"
1013 | Some vcpus -> string_of_int vcpus | None -> "")
1014 (match state.mac_address with
1015 | Some "" -> "Random" | Some mac -> mac | None -> "")
1019 | Yes _ -> Next state
1021 | No | Help | Error -> Ask_again
1024 (* This is the list of dialogs, in order. The user can go forwards or
1025 * backwards through them. The second parameter in each pair is
1026 * false if we need to skip this dialog (info already supplied in
1027 * 'defaults' above).
1030 ask_greeting, (* Initial greeting. *)
1032 ask_hostname, (* Hostname. *)
1033 defaults.remote_host = None;
1034 ask_port, (* Port number. *)
1035 defaults.remote_port = None;
1036 ask_directory, (* Remote directory. *)
1037 defaults.remote_directory = None;
1038 ask_network, (* Network configuration. *)
1039 defaults.network = None;
1040 ask_devices, (* Block devices to send. *)
1041 defaults.devices_to_send = None;
1042 ask_root, (* Root filesystem. *)
1043 defaults.root_filesystem = None;
1044 ask_hypervisor, (* Hypervisor. *)
1045 defaults.hypervisor = None;
1046 ask_architecture, (* Architecture. *)
1047 defaults.architecture = None;
1048 ask_memory, (* Memory. *)
1049 defaults.memory = None;
1050 ask_vcpus, (* VCPUs. *)
1051 defaults.vcpus = None;
1052 ask_mac_address, (* MAC address. *)
1053 defaults.mac_address = None;
1054 ask_verify, (* Verify settings. *)
1058 (* Loop through the dialogs until we reach the end. *)
1059 let rec loop posn state =
1060 eprintf "dialog loop: posn = %d\n%!" posn;
1061 if posn >= Array.length dlgs then state (* Finished all dialogs. *)
1063 let dlg, no_skip = dlgs.(posn) in
1064 let skip = not no_skip in
1066 (* Skip this dialog and move straight to the next one. *)
1070 match dlg state with
1071 | Next new_state -> loop (posn+1) new_state (* Forwards. *)
1072 | Prev -> loop (posn-1) state (* Backwards / back button. *)
1073 | Ask_again -> loop posn state (* Repeat the question. *)
1077 let state = loop 0 defaults in
1079 eprintf "finished dialog loop\n%!";
1081 (* Switch LVM config. *)
1083 putenv "LVM_SYSTEM_DIR" "/etc/lvm.new"; (* see lvm(8) *)
1084 sh "rm -f /etc/lvm/cache/.cache";
1085 sh "rm -f /etc/lvm.new/cache/.cache";
1087 (* Snapshot the block devices to send. *)
1088 let devices_to_send = Option.get state.devices_to_send in
1089 let devices_to_send =
1092 let snapshot_dev = snapshot_name origin_dev in
1093 snapshot origin_dev snapshot_dev;
1094 (origin_dev, snapshot_dev)
1095 ) devices_to_send in
1097 (* Run kpartx on the snapshots. *)
1099 fun (origin, snapshot) ->
1100 shfailok ("kpartx -a " ^ quote ("/dev/mapper/" ^ snapshot))
1103 (* Rescan for LVs. *)
1107 (* Mount the root filesystem under /mnt/root. *)
1108 let root_filesystem = Option.get state.root_filesystem in
1109 (match root_filesystem with
1110 | Part (dev, partnum) ->
1111 let dev = dev ^ partnum in
1112 let snapshot_dev = snapshot_name dev in
1113 sh ("mount " ^ quote ("/dev/mapper/" ^ snapshot_dev) ^ " /mnt/root")
1116 (* The LV will be backed by a snapshot device, so just mount
1119 sh ("mount " ^ quote ("/dev/" ^ vg ^ "/" ^ lv) ^ " /mnt/root")
1122 (* See if we can do network configuration. *)
1123 let network = Option.get state.network in
1126 printf "Network configuration.\n\n";
1127 printf "Please configure the network from this shell.\n\n";
1128 printf "When you have finished, exit the shell with ^D or exit.\n\n%!";
1133 "Trying network auto-configuration from root filesystem ...\n\n%!";
1134 if not (auto_network state) then (
1135 printf "\nAuto-configuration failed. Starting a shell.\n\n";
1136 printf "Please configure the network from this shell.\n\n";
1137 printf "When you have finished, exit the shell with ^D or exit.\n\n";
1142 (* Work out what devices will be called at the remote end. *)
1143 let devices_to_send = List.map (
1144 fun (origin_dev, snapshot_dev) ->
1145 let remote_dev = remote_of_origin_dev origin_dev in
1146 (origin_dev, snapshot_dev, remote_dev)
1147 ) devices_to_send in
1149 (* Modify files on the root filesystem. *)
1150 rewrite_fstab state devices_to_send;
1151 (* XXX Other files to rewrite? *)
1153 (* XXX Autodetect architecture of root filesystem by looking for /bin/ls. *)
1154 let system_architecture = X86_64 in
1156 (* XXX Autodetect system memory. *)
1157 let system_memory = 256 in
1159 (* XXX Autodetect system # pCPUs. *)
1160 let system_nr_cpus = 1 in
1162 (* Unmount the root filesystem and sync disks. *)
1163 sh "umount /mnt/root";
1164 sh "sync"; (* Ugh, should be in stdlib. *)
1166 (* Disable screen blanking on console. *)
1167 sh "setterm -blank 0";
1169 let remote_host = Option.get state.remote_host in
1170 let remote_port = Option.get state.remote_port in
1171 let remote_directory = Option.get state.remote_directory in
1173 (* Functions to connect and disconnect from the remote system. *)
1174 let do_connect remote_name _ =
1175 let cmd = sprintf "ssh -C -p %s %s \"cat > %s/%s\""
1176 (quote remote_port) (quote remote_host)
1177 (quote remote_directory) (quote remote_name) in
1178 eprintf "connect: %s\n%!" cmd;
1179 let chan = open_process_out cmd in
1180 descr_of_out_channel chan, chan
1182 let do_disconnect (_, chan) =
1183 match close_process_out chan with
1184 | WEXITED 0 -> () (* OK *)
1185 | WEXITED i -> failwith (sprintf "ssh: exited with error code %d" i)
1186 | WSIGNALED i -> failwith (sprintf "ssh: killed by signal %d" i)
1187 | WSTOPPED i -> failwith (sprintf "ssh: stopped by signal %d" i)
1190 (* XXX This is using the hostname derived from network configuration
1191 * above. We might want to ask the user to choose.
1193 let hostname = safe_name (gethostname ()) in
1195 let date = sprintf "%04d%02d%02d%02d%02d"
1196 (tm.tm_year+1900) (tm.tm_mon+1) tm.tm_mday tm.tm_hour tm.tm_min in
1197 "p2v-" ^ hostname ^ "-" ^ date in
1199 (* Work out what the image filenames will be at the remote end. *)
1200 let devices_to_send = List.map (
1201 fun (origin_dev, snapshot_dev, remote_dev) ->
1202 let remote_name = basename ^ "-" ^ remote_dev ^ ".img" in
1203 (origin_dev, snapshot_dev, remote_dev, remote_name)
1204 ) devices_to_send in
1206 (* Write a configuration file. Not sure if this is any better than
1207 * just 'sprintf-ing' bits of XML text together, but at least we will
1208 * always get well-formed XML.
1210 * XXX For some of the stuff here we really should do a
1211 * virConnectGetCapabilities call to the remote host first.
1213 * XXX There is a case for using virt-install to generate this XML.
1214 * When we start to incorporate libvirt access & storage API this
1215 * needs to be rethought.
1217 let conf_filename = basename ^ ".conf" in
1220 match state.architecture with
1221 | Some UnknownArch | None -> system_architecture
1222 | Some arch -> arch in
1224 match state.memory with
1225 | Some 0 | None -> system_memory
1226 | Some memory -> memory in
1228 match state.vcpus with
1229 | Some 0 | None -> system_nr_cpus
1232 match state.mac_address with
1235 List.map (sprintf "%02x") (
1236 List.map (fun _ -> Random.int 256) [0;0;0]
1238 String.concat ":" ("00"::"16"::"3e"::random)
1239 | Some mac -> mac in
1242 (* Shortcut to make "<name>value</name>". *)
1243 let leaf name value = Xml.Element (name, [], [Xml.PCData value]) in
1244 (* ... and the _other_ sort of leaf (god I hate XML). *)
1245 let tleaf name attribs = Xml.Element (name, attribs, []) in
1247 (* Standard stuff for every domain. *)
1248 let name = leaf "name" hostname in
1249 let memory = leaf "memory" (string_of_int (memory * 1024)) in
1250 let vcpu = leaf "vcpu" (string_of_int vcpus) in
1252 (* Top-level stuff which differs for each HV type (isn't this supposed
1253 * to be portable ...)
1256 match state.hypervisor with
1258 [Xml.Element ("os", [],
1260 leaf "loader" "/usr/lib/xen/boot/hvmloader";
1261 tleaf "boot" ["dev", "hd"]]);
1262 Xml.Element ("features", [],
1266 tleaf "clock" ["sync", "localtime"]]
1268 [Xml.Element ("os", [], [leaf "type" "hvm"]);
1269 tleaf "clock" ["sync", "localtime"]]
1271 [Xml.Element ("os", [],
1272 [Xml.Element ("type",
1274 string_of_architecture architecture;
1276 [Xml.PCData "hvm"]);
1277 tleaf "boot" ["dev", "hd"]])]
1281 (* <devices> section. *)
1284 match state.hypervisor with
1286 [leaf "emulator" "/usr/lib64/xen/bin/qemu-dm"] (* XXX lib64? *)
1288 [leaf "emulator" "/usr/bin/qemu"]
1290 [leaf "emulator" "/usr/bin/qemu-kvm"]
1294 Xml.Element ("interface", ["type", "user"],
1295 [tleaf "mac" ["address", mac_address]]) in
1296 (* XXX should have an option for Xen bridging:
1298 "interface", ["type","bridge"],
1299 [tleaf "source" ["bridge","xenbr0"];
1300 tleaf "mac" ["address",mac_address];
1301 tleaf "script" ["path","vif-bridge"]])*)
1302 let graphics = tleaf "graphics" ["type", "vnc"] in
1304 let disks = List.map (
1305 fun (_, _, remote_dev, remote_name) ->
1307 "disk", ["type", "file";
1309 [tleaf "source" ["file", remote_directory ^ "/" ^ remote_name];
1310 tleaf "target" ["dev", remote_dev]]
1312 ) devices_to_send in
1316 emulator @ interface :: graphics :: disks
1319 (* Put it all together in <domain type='foo'>. *)
1322 (match state.hypervisor with
1323 | Some Xen -> ["type", "xen"]
1324 | Some QEMU -> ["type", "qemu"]
1325 | Some KVM -> ["type", "kvm"]
1327 name :: memory :: vcpu :: extras @ [devices]
1330 let xml = Xml.to_string_fmt xml in
1331 let xml_len = String.length xml in
1332 eprintf "length of configuration file is %d bytes\n%!" xml_len;
1334 let (sock,_) as conn = do_connect conf_filename (Int64.of_int xml_len) in
1335 (* In OCaml this actually loops calling write(2) *)
1336 ignore (write sock xml 0 xml_len);
1339 (* Send the device snapshots to the remote host. *)
1340 (* XXX This code should be made more robust against both network
1341 * errors and local I/O errors. Also should allow the user several
1342 * attempts to connect, or let them go back to the dialog stage.
1345 fun (origin_dev, snapshot_dev, remote_dev, remote_name) ->
1346 eprintf "sending %s as %s\n%!" origin_dev remote_name;
1349 try List.assoc origin_dev all_block_devices
1350 with Not_found -> assert false (* internal error *) in
1352 printf "Sending /dev/%s (%.3f GB) to remote machine\n%!" origin_dev
1353 ((Int64.to_float size) /. (1024.*.1024.*.1024.));
1355 (* Open the snapshot device. *)
1356 let fd = openfile ("/dev/mapper/" ^ snapshot_dev) [O_RDONLY] 0 in
1359 let (sock,_) as conn = do_connect remote_name size in
1361 (* Copy the data. *)
1362 let bufsize = 1024 * 1024 in
1363 let buffer = String.create bufsize in
1364 let start = gettimeofday () in
1366 let rec copy bytes_sent last_printed_at =
1367 let n = read fd buffer 0 bufsize in
1369 ignore (write sock buffer 0 n);
1371 let bytes_sent = Int64.add bytes_sent (Int64.of_int n) in
1372 let last_printed_at =
1373 let now = gettimeofday () in
1374 (* Print progress once per second. *)
1375 if now -. last_printed_at > 1. then (
1376 let elapsed = Int64.to_float bytes_sent /. Int64.to_float size in
1377 let secs_elapsed = now -. start in
1378 printf "%.0f%%" (100. *. elapsed);
1379 (* After 60 seconds has elapsed, start printing estimates. *)
1380 if secs_elapsed >= 60. then (
1381 let remaining = 1. -. elapsed in
1382 let secs_remaining = (remaining /. elapsed) *. secs_elapsed in
1383 if secs_remaining > 120. then
1384 printf " (about %.0f minutes remaining) "
1385 (secs_remaining /. 60.)
1387 printf " (about %.0f seconds remaining) "
1393 else last_printed_at in
1395 copy bytes_sent last_printed_at
1404 (* Clean up and reboot. *)
1406 msgbox "virt-p2v completed"
1407 (sprintf "\nThe physical to virtual migration is complete.\n\nPlease verify the disk image(s) and configuration file on the remote host, and then start up the virtual machine by doing:\n\ncd %s\nvirsh define %s\n\nWhen you press [OK] this machine will reboot."
1408 remote_directory conf_filename)
1417 eprintf "usage: virt-p2v [ttyname]\n%!";
1420 (* Make sure that exceptions from 'main' get printed out on stdout
1421 * as well as stderr, since stderr is probably redirected to the
1422 * logfile, and so not visible to the user.
1424 let handle_exn f arg =
1426 with exn -> print_endline (Printexc.to_string exn); raise exn
1428 (* If the ISO image has an attachment then it could be a new version
1429 * of virt-p2v.ml (this script). Get the attachment and run it
1430 * instead. Useful mainly for testing, in conjunction with the
1431 * 'make update' target in the virt-p2v Makefile.
1433 let magic = "ISOATTACHMENT002"
1434 let magiclen = String.length magic (* = 16 bytes *)
1435 let trailerlen = magiclen + 8 + 8 (* magic + file start + true size *)
1437 let int64_of_string str =
1439 let add offs shift =
1442 (Int64.shift_left (Int64.of_int (Char.code str.[offs])) shift) !i
1444 add 0 56; add 1 48; add 2 40; add 3 32;
1445 add 4 24; add 5 16; add 6 8; add 7 0;
1448 let update ttyname =
1449 let cdrom = "/dev/cdrom" in
1450 let output = "/tmp/virt-p2v.ml" in
1453 let fd = openfile cdrom [O_RDONLY] 0 in
1454 ignore (LargeFile.lseek fd (Int64.of_int ~-trailerlen) SEEK_END);
1455 let buf = String.create magiclen in
1456 if read fd buf 0 magiclen <> magiclen || buf <> magic then (
1461 (* Read the size. *)
1462 let buf = String.create 8 in
1463 if read fd buf 0 8 <> 8 then
1464 failwith "cannot read attachment offset";
1465 let offset = int64_of_string buf in
1466 let buf = String.create 8 in
1467 if read fd buf 0 8 <> 8 then
1468 failwith "cannot read attachment size";
1469 let size = Int64.to_int (int64_of_string buf) in
1471 (* Seek to beginning of the attachment. *)
1472 ignore (LargeFile.lseek fd offset SEEK_SET);
1474 (* Copy out the attachment. *)
1475 let fd2 = openfile output [O_WRONLY; O_CREAT; O_TRUNC] 0o755 in
1476 let bufsize = 4 * 1024 in
1477 let buffer = String.create bufsize in
1478 let rec copy remaining =
1479 if remaining > 0 then (
1480 let n = min remaining bufsize in
1481 let n = read fd buffer 0 n in
1482 if n = 0 then failwith "corrupted or partial attachment";
1483 ignore (write fd2 buffer 0 n);
1484 copy (remaining - n)
1492 (* Run updated virt-p2v script. *)
1493 execv output [| output; ttyname |]
1495 Unix_error _ | Exit ->
1496 (* Some error, or no attachment, so keep running this script. *)
1497 handle_exn main (Some ttyname)
1499 (* Test harness for the Makefile. The Makefile invokes this script as
1500 * 'virt-p2v.ml --test' just to check it compiles. When it is running
1501 * from the actual live CD, there is a single parameter which is the
1502 * tty name (so usually 'virt-p2v.ml tty1').
1505 match Array.to_list Sys.argv with
1506 | [ _; "--test" ] -> () (* Makefile test - do nothing. *)
1507 | [ _; "--update"; ttyname ] -> (* Test for update and run. *)
1509 | [ _; ("--help"|"-help"|"-?"|"-h") ] -> usage ();
1510 | [ _; ttyname ] -> (* Run main with ttyname. *)
1511 handle_exn main (Some ttyname)
1512 | [ _ ] -> (* Interactive - no ttyname. *)
1513 handle_exn main None
1516 (* This file must end with a newline *)