#!/usr/bin/ocamlrun /usr/bin/ocaml
#load "unix.cma";;
+#directory "+extlib";;
+#load "extLib.cma";;
+#directory "+pcre";;
+#load "pcre.cma";;
+
(* virt-p2v.ml is a script which performs a physical to
* virtual conversion of local disks.
*
open Unix
open Printf
+open ExtList
+open ExtString
type state = { greeting : bool;
remote_host : string option; remote_port : string option;
remote_transport : transport option;
remote_directory : string option;
+ network : network option;
devices_to_send : string list option;
- root_filesystem : string option; network : network option }
+ root_filesystem : partition option }
and transport = SSH | TCP
and network = Auto | Shell
-
-type dialog_status = Yes | No | Help | Extra | Error
-
-let default d = function None -> d | Some p -> p
+and partition = Part of string * string (* eg. "hda", "1" *)
+ | LV of string * string (* eg. "VolGroup00", "LogVol00" *)
(*----------------------------------------------------------------------*)
(* TO MAKE A CUSTOM virt-p2v SCRIPT, adjust the defaults in this section.
*)
devices_to_send = None;
- (* The root filesystem containing /etc/fstab. Set to 'Some "sda3"'
- * or 'Some "VolGroup00/LogVol00"' for example, else ask user.
+ (* The root filesystem containing /etc/fstab. Set to
+ * 'Some (Part ("sda", "3"))' or 'Some (LV ("VolGroup00", "LogVol00"))'
+ * for example, else ask user.
*)
root_filesystem = None;
(* END OF CUSTOM virt-p2v SCRIPT SECTION. *)
(*----------------------------------------------------------------------*)
+(* General helper functions. *)
+
+let sort_uniq ?(cmp = compare) xs = (* sort and uniq a list *)
+ let xs = List.sort ~cmp xs in
+ let rec loop = function
+ | [] -> [] | [x] -> [x]
+ | x1 :: x2 :: xs when x1 = x2 -> loop (x1 :: xs)
+ | x :: xs -> x :: loop xs
+ in
+ loop xs
+
+let rec string_of_state state =
+ sprintf
+ "greeting: %b remote: %s:%s%s%s network: %s devices: [%s] root: %s"
+ state.greeting
+ (Option.default "" state.remote_host)
+ (Option.default "" state.remote_port)
+ (match state.remote_transport with
+ | None -> "" | Some SSH -> " (ssh)" | Some TCP -> " (tcp)")
+ (match state.remote_directory with
+ | None -> "" | Some dir -> " " ^ dir)
+ (match state.network with
+ | None -> "none" | Some Auto -> "auto" | Some Shell -> "shell")
+ (String.concat "; " (Option.default [] state.devices_to_send))
+ (Option.map_default dev_of_partition "" state.root_filesystem)
+
+and dev_of_partition = function
+ | Part (dev, partnum) -> sprintf "/dev/%s%s" dev partnum
+ | LV (vg, lv) -> sprintf "/dev/%s/%s" vg lv
+
+type dialog_status = Yes of string list | No | Help | Back | Error
+
+type ask_result = Next of state | Prev | Ask_again
+
+let input_all_lines chan =
+ let lines = ref [] in
+ try
+ while true do lines := input_line chan :: !lines done; []
+ with
+ End_of_file -> List.rev !lines
+
+(* Same as `cmd` in shell. Any error message will be in the logfile. *)
+let shget cmd =
+ let chan = open_process_in cmd in
+ let lines = input_all_lines chan in
+ match close_process_in chan with
+ | WEXITED 0 -> Some lines (* command succeeded *)
+ | WEXITED _ -> None (* command failed *)
+ | WSIGNALED i -> failwith (sprintf "shget: command killed by signal %d" i)
+ | WSTOPPED i -> failwith (sprintf "shget: command stopped by signal %d" i)
+
+let is_dir path = (stat path).st_kind = S_DIR
+
+type block_device = string * int64 (* "hda" & size in bytes *)
+
+(* Parse the output of 'lvs' to get list of LV names, sizes,
+ * corresponding PVs, etc. Returns a list of (lvname, PVs, lvsize).
+ *)
+let get_lvs =
+ let whitespace = Pcre.regexp "[ \t]+" in
+ let comma = Pcre.regexp "," in
+ let devname = Pcre.regexp "^/dev/(.+)\\(.+\\)$" in
+
+ function () ->
+ match
+ shget "lvs --noheadings -o vg_name,lv_name,devices,lv_size"
+ with
+ | None -> []
+ | Some lines ->
+ let lines = List.map (Pcre.split ~rex:whitespace) lines in
+ List.map (
+ function
+ | [vg; lv; pvs; lvsize]
+ | [_; vg; lv; pvs; lvsize] ->
+ let pvs = Pcre.split ~rex:comma pvs in
+ let pvs = List.map (
+ fun pv ->
+ try
+ let subs = Pcre.exec ~rex:devname pv in
+ Pcre.get_substring subs 1
+ with
+ Not_found -> failwith ("lvs: unexpected device name: " ^ pv)
+ ) pvs in
+ LV (vg, lv), pvs, lvsize
+ | line ->
+ failwith ("lvs: unexpected output: " ^ String.concat "," line)
+ ) lines
+
+(* Get the partitions on a block device.
+ * eg. "sda" -> [Part ("sda","1"); Part ("sda", "2")]
+ *)
+let get_partitions dev =
+ let rex = Pcre.regexp ("^" ^ dev ^ "(.+)$") in
+ let devdir = "/sys/block/" ^ dev in
+ let parts = Sys.readdir devdir in
+ let parts = Array.to_list parts in
+ let parts = List.filter (fun name -> is_dir (devdir ^ "/" ^ name)) parts in
+ let parts = List.filter_map (
+ fun part ->
+ try
+ let subs = Pcre.exec ~rex part in
+ Some (Part (dev, Pcre.get_substring subs 1))
+ with
+ Not_found -> None
+ ) parts in
+ parts
+
+(* Dialog functions.
+ *
+ * Each function takes some common parameters (eg. ~title) and some
+ * dialog-specific parameters.
+ *
+ * Returns the exit status (Yes lines | No | Help | Back | Error).
+ *)
+let msgbox, inputbox, radiolist, checklist =
+ (* Internal function to actually run the "dialog" shell command. *)
+ let run_dialog cparams params =
+ let params = cparams @ params in
+ eprintf "dialog [%s]\n%!"
+ (String.concat "; " (List.map (sprintf "%S") params));
+
+ (* 'dialog' writes its output/result to stderr, so we need to take
+ * special steps to capture that - in other words, manual pipe/fork.
+ *)
+ let rfd, wfd = pipe () in
+ match fork () with
+ | 0 -> (* child, runs dialog *)
+ close rfd;
+ dup2 wfd stderr; (* capture stderr to pipe *)
+ execvp "dialog" (Array.of_list ("dialog" :: params))
+ | pid -> (* parent *)
+ close wfd;
+ let chan = in_channel_of_descr rfd in
+ let result = input_all_lines chan in
+ close rfd;
+ eprintf "dialog result: %S\n%!" (String.concat "\n" result);
+ match snd (wait ()) with
+ | WEXITED 0 -> Yes result (* something selected / entered *)
+ | WEXITED 1 -> No (* cancel / no button *)
+ | WEXITED 2 -> Help (* help pressed *)
+ | WEXITED 3 -> Back (* back button *)
+ | WEXITED _ -> Error (* error or Esc *)
+ | WSIGNALED i -> failwith (sprintf "dialog: killed by signal %d" i)
+ | WSTOPPED i -> failwith (sprintf "dialog: stopped by signal %d" i)
+ in
+
+ (* Handle the common parameters. Note Continuation Passing Style. *)
+ let with_common cont ?(cancel=false) ?(backbutton=true) title =
+ let params = ["--title"; title] in
+ let params = if not cancel then "--nocancel" :: params else params in
+ let params =
+ if backbutton then "--extra-button" :: "--extra-label" :: "Back" :: params
+ else params in
+ cont params
+ in
+
+ (* Message box. *)
+ let msgbox =
+ with_common (
+ fun cparams text height width ->
+ run_dialog cparams
+ [ "--msgbox"; text; string_of_int height; string_of_int width ]
+ )
+ in
+
+ (* Simple input box. *)
+ let inputbox =
+ with_common (
+ fun cparams text height width default ->
+ run_dialog cparams
+ [ "--inputbox"; text; string_of_int height; string_of_int width;
+ default ]
+ )
+ in
+
+ (* Radio list and check list. *)
+ let radiolist =
+ with_common (
+ fun cparams text height width listheight items ->
+ let items = List.map (
+ function
+ | tag, item, true -> [ tag; item; "on" ]
+ | tag, item, false -> [ tag; item; "off" ]
+ ) items in
+ let items = List.concat items in
+ let items = "--single-quoted" ::
+ "--radiolist" :: text ::
+ string_of_int height :: string_of_int width ::
+ string_of_int listheight :: items in
+ run_dialog cparams items
+ )
+ in
+
+ let checklist =
+ with_common (
+ fun cparams text height width listheight items ->
+ let items = List.map (
+ function
+ | tag, item, true -> [ tag; item; "on" ]
+ | tag, item, false -> [ tag; item; "off" ]
+ ) items in
+ let items = List.concat items in
+ let items = "--separate-output" ::
+ "--checklist" :: text ::
+ string_of_int height :: string_of_int width ::
+ string_of_int listheight :: items in
+ run_dialog cparams items
+ )
+ in
+ msgbox, inputbox, radiolist, checklist
+
+(* Print failure dialog and exit. *)
+let fail_dialog text =
+ let text = 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
+ ignore (msgbox "Error" text 17 50);
+ exit 1
+
(* Main entry point. *)
let rec main ttyname =
(* Running from an init script. We don't have much of a
(* Log the start up time. *)
eprintf "\n\n**************************************************\n\n";
let tm = localtime (time ()) in
- eprintf "virt-p2v-ng starting up at %04d-%02d-%02d %02d:%02d:%02d\n%!"
+ eprintf "virt-p2v-ng starting up at %04d-%02d-%02d %02d:%02d:%02d\n\n%!"
(tm.tm_year+1900) (tm.tm_mon+1) tm.tm_mday tm.tm_hour tm.tm_min tm.tm_sec;
(* Connect stdin/stdout to the tty. *)
dup2 fd stdout;
close fd);
+ (* Search for all non-removable block devices. Do this early and bail
+ * if we can't find anything. This is a list of strings, like "hda".
+ *)
+ let all_block_devices : block_device list =
+ let rex = Pcre.regexp "^[hs]d" in
+ let devices = Array.to_list (Sys.readdir "/sys/block") in
+ let devices = List.sort devices in
+ let devices = List.filter (fun d -> Pcre.pmatch ~rex d) devices in
+ eprintf "all_block_devices: block devices: %s\n%!"
+ (String.concat "; " devices);
+ (* Run blockdev --getsize64 on each, and reject any where this fails
+ * (probably removable devices).
+ *)
+ let devices = List.filter_map (
+ fun d ->
+ let cmd = "blockdev --getsize64 /dev/" ^ Filename.quote d in
+ let lines = shget cmd in
+ match lines with
+ | Some (blksize::_) -> Some (d, Int64.of_string blksize)
+ | Some [] | None -> None
+ ) devices in
+ eprintf "all_block_devices: non-removable block devices: %s\n%!"
+ (String.concat "; "
+ (List.map (fun (d, b) -> sprintf "%s [%Ld]" d b) devices));
+ if devices = [] then
+ fail_dialog "No non-removable block devices (hard disks, etc.) could be found on this machine.";
+ devices in
+
+ (* Search for partitions and LVs (anything that could contain a
+ * filesystem directly). We refer to these generically as
+ * "partitions".
+ *)
+ let all_partitions : partition list =
+ (* LVs & PVs. *)
+ let lvs, pvs =
+ let lvs = get_lvs () in
+ let pvs = List.map (fun (_, pvs, _) -> pvs) lvs in
+ let pvs = List.concat pvs in
+ let pvs = sort_uniq pvs in
+ eprintf "all_partitions: PVs: %s\n%!" (String.concat "; " pvs);
+ let lvs = List.map (fun (lvname, _, _) -> lvname) lvs in
+ eprintf "all_partitions: LVs: %s\n%!"
+ (String.concat "; " (List.map dev_of_partition lvs));
+ lvs, pvs in
+
+ (* Partitions (eg. "sda1", "sda2"). *)
+ let parts =
+ let parts = List.map fst all_block_devices in
+ let parts = List.map get_partitions parts in
+ let parts = List.concat parts in
+ eprintf "all_partitions: all partitions: %s\n%!"
+ (String.concat "; " (List.map dev_of_partition parts));
+
+ (* Remove any partitions which are PVs. *)
+ let parts = List.filter (
+ function
+ | Part (dev, partnum) -> not (List.mem (dev ^ partnum) pvs)
+ | LV _ -> assert false
+ ) parts in
+ parts in
+ eprintf "all_partitions: partitions after removing PVs: %s\n%!"
+ (String.concat "; " (List.map dev_of_partition parts));
+
+ (* Concatenate LVs & Parts *)
+ lvs @ parts in
+
(* Dialogs. *)
- let rec ask_greeting state =
- ignore (
- dialog [
- title "virt-p2v" ();
- msgbox "\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." 17 50
- ]
- );
- Some state
-
- and ask_transport state =
- ignore ( (* XXX *)
- dialog [
- title "Connection type" ~cancel:false ();
- radiolist "Connection type" 10 50 2 [
+ let ask_greeting state =
+ 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);
+ Next state
+ in
+
+ let ask_transport state =
+ match
+ radiolist "Connection type" ~backbutton:false
+ "Connection type" 10 50 2 [
"ssh", "SSH (secure shell - recommended)",
state.remote_transport = Some SSH;
"tcp", "TCP socket",
state.remote_transport = Some TCP
]
+ with
+ | Yes ("ssh"::_) -> Next { state with remote_transport = Some SSH }
+ | Yes ("tcp"::_) -> Next { state with remote_transport = Some TCP }
+ | Yes _ | No | Help | Error -> Ask_again
+ | Back -> Prev
+ in
+
+ let ask_hostname state =
+ match
+ inputbox "Remote host" "Remote host" 10 50
+ (Option.default "" state.remote_host)
+ with
+ | Yes [] -> Ask_again
+ | Yes (hostname::_) -> Next { state with remote_host = Some hostname }
+ | No | Help | Error -> Ask_again
+ | Back -> Prev
+ in
+
+ let ask_port state =
+ match
+ inputbox "Remote port" "Remote port" 10 50
+ (Option.default "" state.remote_port)
+ with
+ | Yes [] ->
+ if state.remote_transport = Some TCP then
+ Next { state with remote_port = Some "16211" }
+ else
+ Next { state with remote_port = Some "22" }
+ | Yes (port::_) -> Next { state with remote_port = Some port }
+ | No | Help | Error -> Ask_again
+ | Back -> Prev
+ in
+
+ let ask_directory state =
+ match
+ inputbox "Remote directory" "Remote directory" 10 50
+ (Option.default "" state.remote_directory)
+ with
+ | Yes [] ->
+ Next { state with remote_directory = Some "/var/lib/xen/images" }
+ | Yes (dir::_) -> Next { state with remote_directory = Some dir }
+ | No | Help | Error -> Ask_again
+ | Back -> Prev
+ in
+
+ let ask_network state =
+ match
+ radiolist "Network configuration" "Network configuration" 10 50 2 [
+ "auto", "Automatic configuration", state.network = Some Auto;
+ "sh", "Configure from the shell", state.network = Some Shell;
]
- );
- Some state
-
- and ask_hostname state =
- ignore ( (* XXX *)
- dialog [
- title "Remote host" ~cancel:false ~backbutton:true ();
- inputbox "Remote host" 10 50 (default "" state.remote_host)
- ]
- );
- Some state
-
- and ask_port state =
- ignore ( (* XXX *)
- dialog [
- title "Remote port" ~cancel:false ~backbutton:true ();
- inputbox "Remote port" 10 50 (default "" state.remote_port)
- ]
- );
- Some state
+ with
+ | Yes ("auto"::_) -> Next { state with network = Some Auto }
+ | Yes ("sh"::_) -> Next { state with network = Some Shell }
+ | Yes _ | No | Help | Error -> Ask_again
+ | Back -> Prev
+ in
+ let ask_devices state =
+ let selected_devices = Option.default [] state.devices_to_send in
+ let devices = List.map (
+ fun (dev, blksize) ->
+ (dev,
+ sprintf "/dev/%s (%.3f GB)" dev
+ ((Int64.to_float blksize) /. (1024.*.1024.*.1024.)),
+ List.mem dev selected_devices)
+ ) all_block_devices in
+ match
+ checklist "Devices" "Pick devices to send" 15 50 8 devices
+ with
+ | Yes [] | No | Help | Error -> Ask_again
+ | Yes devices -> Next { state with devices_to_send = Some devices }
+ | Back -> Prev
+ in
+
+ let ask_root state =
+ let parts = List.mapi (
+ fun i part ->
+ (string_of_int i, dev_of_partition part,
+ Some part = state.root_filesystem)
+ ) all_partitions in
+ match
+ radiolist "Root device"
+ "Pick partition containing the root (/) filesystem" 15 50 6
+ parts
+ with
+ | Yes (i::_) ->
+ let part = List.nth all_partitions (int_of_string i) in
+ Next { state with root_filesystem = Some part }
+ | Yes [] | No | Help | Error -> Ask_again
+ | Back -> Prev
in
(* This is the list of dialogs, in order. The user can go forwards or
defaults.remote_host = None;
ask_port, (* Port number. *)
defaults.remote_port = None;
-(* ask_directory, (* Remote directory. *)
+ ask_directory, (* Remote directory. *)
defaults.remote_directory = None;
+ ask_network, (* Network configuration. *)
+ defaults.network = None;
ask_devices, (* Block devices to send. *)
defaults.devices_to_send = None;
ask_root, (* Root filesystem. *)
defaults.root_filesystem = None;
- ask_network, (* Network configuration. *)
- defaults.network = None;
- ask_verify, (* Verify settings. *)
+(* ask_verify, (* Verify settings. *)
defaults.greeting*)
|] in
(* Skip this dialog and move straight to the next one. *)
loop (posn+1) state
else (
- (* Run dialog. Either the state is updated or 'None' is
- * returned, which indicates that the user hit the back button.
- *)
- let next_state = dlg state in
- match next_state with
- | Some state -> loop (posn+1) state (* Forwards. *)
- | None -> loop (posn-1) state (* Backwards. *)
+ (* Run dialog. *)
+ match dlg state with
+ | Next new_state -> loop (posn+1) new_state (* Forwards. *)
+ | Prev -> loop (posn-1) state (* Backwards / back button. *)
+ | Ask_again -> loop posn state (* Repeat the question. *)
)
)
in
let state = loop 0 defaults in
- eprintf "finished dialog loop\n%!";
+ eprintf "finished dialog loop\nstate = %s\n%!" (string_of_state state);
()
-(* Run the external 'dialog' command with the given list of parameters.
- * Actually it's a list-of-list-of-parameters because you would normally
- * use this function like this:
- * dialog [
- * title (* title and other common parameters *) ();
- * dialogtype (* specific parameter *)
- * ]
- * where 'dialogtype' is a function such as 'msgbox' (see below)
- * representing a specific subfunction of dialog.
- *
- * The functions 'title' and 'dialogtype' return partially-constructed
- * lists of shell parameters. See the dialog manpage.
- *
- * Returns the exit status (Yes | No | Help | Extra | Error).
- *)
-and dialog params =
- let params = List.concat params in (* list-of-list to flat list *)
- let params = List.map Filename.quote params in (* shell quoting *)
- let cmd = String.concat " " ("dialog" :: params) in
- eprintf "%s\n%!" cmd; (* log the full command *)
- let r = Sys.command cmd in
- match r with
- | 0 -> Yes | 1 -> No | 2 -> Help | 3 -> Extra | _ -> Error
-
-(* Title and common dialog options. *)
-and title title ?(cancel=true) ?(backbutton=false) () =
- let params = ["--title"; title] in
- let params = if not cancel then "--nocancel" :: params else params in
- let params =
- if backbutton then "--extra-button" :: "--extra-label" :: "Back" :: params
- else params in
- params
-
-(* Message box. *)
-and msgbox text height width =
- [ "--msgbox"; text; string_of_int height; string_of_int width ]
-
-and inputbox text height width default =
- [ "--inputbox"; text; string_of_int height; string_of_int width; default ]
-
-and radiolist text height width listheight items =
- let items = List.map (
- function
- | tag, item, true -> [ tag; item; "on" ]
- | tag, item, false -> [ tag; item; "off" ]
- ) items in
- let items = List.concat items in
- "--radiolist" :: text :: string_of_int height :: string_of_int width ::
- string_of_int listheight :: items
-
let usage () =
eprintf "usage: virt-p2v [ttyname]\n%!";
exit 2
git.annexia.org / virt-p2v.git / blobdiff