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(* helper-v2v-input
* Copyright (C) 2009-2021 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*)
open Printf
open Unix
open Std_utils
open Tools_utils
open Common_gettext.Gettext
open Types
open Utils
open Name_from_disk
open Input
module OVA = struct
let to_string options args = String.concat " " ("-i ova" :: args)
let query_input_options () =
printf (f_"No input options can be used in this mode.\n")
(* RHBZ#1570407: VMware-generated OVA files found in the wild can
* contain hrefs referencing snapshots. The href will be something
* like: <File href="disk1.vmdk"/> but the actual disk will be a
* snapshot called something like "disk1.vmdk.000000000".
*)
let re_snapshot = PCRE.compile "\\.(\\d+)$"
let rec setup dir options args =
if options.input_options <> [] then
error (f_"no -io (input options) are allowed here");
let ova =
match args with
| [ova] -> ova
| _ ->
error (f_"-i ova: expecting an OVA file name on the command line") in
(* Check the OVA file is readable. *)
access ova [R_OK];
(* Extract ova file. *)
let ova_t = OVA.parse_ova ova in
(* Extract ovf file from ova. *)
let ovf = OVA.get_ovf_file ova_t in
(* Extract the manifest from *.mf files in the ova. *)
let manifest = OVA.get_manifest ova_t in
(* Verify checksums of files listed in the manifest. *)
List.iter (
fun (file_ref, csum) ->
let filename, r =
match file_ref with
| OVA.LocalFile filename ->
filename, Checksums.verify_checksum csum filename
| OVA.TarFile (tar, filename) ->
filename, Checksums.verify_checksum csum ~tar filename in
match r with
| Checksums.Good_checksum -> ()
| Checksums.Mismatched_checksum (_, actual) ->
error (f_"-i ova: corrupt OVA: checksum of disk %s does not match \
manifest (actual = %s, expected = %s)")
filename actual (Checksums.string_of_csum_t csum)
| Checksums.Missing_file ->
(* RHBZ#1570407: Some OVA files generated by VMware
* reference non-existent components in the *.mf file.
* Generate a warning and ignore it.
*)
warning (f_"manifest has a checksum for non-existent file %s \
(ignored)")
filename
) manifest;
(* Parse the ovf file. *)
let name, memory, vcpu, cpu_topology, firmware, disks, removables, nics =
OVF.parse_ovf_from_ova ovf in
let name =
match name with
| None ->
warning (f_"could not parse ovf:Name from OVF document");
name_from_disk ova
| Some name -> name in
(* Convert the disk hrefs into qemu URIs. *)
let qemu_uris =
List.map (
fun { OVF.href; compressed } ->
let file_ref = find_file_or_snapshot ova_t href manifest in
match compressed, file_ref with
| false, OVA.LocalFile filename ->
filename
| true, OVA.LocalFile filename ->
(* The spec allows the file to be gzip-compressed, in
* which case we must uncompress it into a temporary.
*)
let new_filename =
Filename.temp_file ~temp_dir:Utils.large_tmpdir
"ova" ".vmdk" in
On_exit.unlink new_filename;
let cmd =
sprintf "zcat %s > %s"
(quote filename) (quote new_filename) in
if shell_command cmd <> 0 then
error (f_"error uncompressing %s, see earlier error messages")
filename;
new_filename
| false, OVA.TarFile (tar, filename) ->
(* This is the tar optimization. *)
let offset, size =
try OVA.get_tar_offet_and_size tar filename
with
| Not_found ->
error (f_"file ‘%s’ not found in the ova") filename
| Failure msg -> error (f_"%s") msg in
(* QEMU requires size aligned to 512 bytes. This is safe because
* tar also works with 512 byte blocks.
*)
let size = roundup64 size 512L in
(* Workaround for libvirt bug RHBZ#1431652. *)
let tar_path = absolute_path tar in
let doc = [
"file", JSON.Dict [
"driver", JSON.String "raw";
"offset", JSON.Int offset;
"size", JSON.Int size;
"file", JSON.Dict [
"driver", JSON.String "file";
"filename", JSON.String tar_path]
]
] in
let uri =
sprintf "json:%s"
(JSON.string_of_doc ~fmt:JSON.Compact doc) in
uri
| true, OVA.TarFile _ ->
(* This should not happen since {!OVA} knows that
* qemu cannot handle compressed files here.
*)
assert false
) disks in
(* Create the source metadata. *)
let s_disks = List.map (fun { OVF.source_disk } -> source_disk) disks in
let source = {
s_hypervisor = VMware;
s_name = name;
s_genid = None; (* XXX *)
s_memory = memory;
s_vcpu = vcpu;
s_cpu_vendor = None;
s_cpu_model = None;
s_cpu_topology = cpu_topology;
s_features = []; (* XXX *)
s_firmware = firmware;
s_display = None; (* XXX *)
s_sound = None;
s_disks = s_disks;
s_removables = removables;
s_nics = nics;
} in
(* Run qemu-nbd for each disk. *)
List.iteri (
fun i qemu_uri ->
let socket = sprintf "%s/in%d" dir i in
On_exit.unlink socket;
let cmd = QemuNBD.create qemu_uri in
QemuNBD.set_snapshot cmd options.read_only; (* protective overlay *)
QemuNBD.set_format cmd None; (* auto-detect format *)
let _, pid = QemuNBD.run_unix socket cmd in
On_exit.kill pid
) qemu_uris;
source
and find_file_or_snapshot ova_t href manifest =
match OVA.resolve_href ova_t href with
| Some f -> f
| None ->
(* Find all files in the OVA called [<href>.\d+] *)
let files = OVA.get_file_list ova_t in
let snapshots =
List.filter_map (
function
| OVA.LocalFile filename ->
get_snapshot_if_matches href filename
| OVA.TarFile (_, filename) ->
get_snapshot_if_matches href filename
) files in
(* Pick highest. *)
let snapshots = List.sort (fun a b -> compare b a) snapshots in
match snapshots with
| [] -> error_missing_href href
| snapshot::_ ->
let href = sprintf "%s.%s" href snapshot in
match OVA.resolve_href ova_t href with
| None -> error_missing_href href
| Some f -> f
(* If [filename] matches [<href>.\d+] then return [Some snapshot]. *)
and get_snapshot_if_matches href filename =
if PCRE.matches re_snapshot filename then (
let snapshot = PCRE.sub 1 in
if String.is_suffix filename (sprintf "%s.%s" href snapshot) then
Some snapshot
else
None
)
else None
and error_missing_href href =
error (f_"-i ova: OVF references file ‘%s’ which was not found \
in the OVA archive") href
end
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