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OVF.ml
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OVF.ml
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(* virt-v2v
* Copyright (C) 2009-2020 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.
*)
(* Parse OVF from an externally produced OVA file. *)
open Std_utils
open Tools_utils
open Unix_utils
open Common_gettext.Gettext
open Types
open Utils
open Xpath_helpers
open Printf
type disk = {
source_disk : Types.source_disk;
href : string; (* The <File href> from the OVF file. *)
compressed : bool; (* If the file is gzip compressed. *)
}
let xpathctx_of_ovf ovf_filename =
let doc = Xml.parse_file ovf_filename in
(* Handle namespaces. *)
let xpathctx = Xml.xpath_new_context doc in
Xml.xpath_register_ns xpathctx
"ovf" "http://schemas.dmtf.org/ovf/envelope/1";
Xml.xpath_register_ns xpathctx
"rasd" "http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_ResourceAllocationSettingData";
Xml.xpath_register_ns xpathctx
"vmw" "http://www.vmware.com/schema/ovf";
Xml.xpath_register_ns xpathctx
"vssd" "http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/CIM_VirtualSystemSettingData";
xpathctx
let rec parse_ovf_from_ova ovf_filename =
let xpathctx = xpathctx_of_ovf ovf_filename in
let xpath_string = xpath_string xpathctx
and xpath_int = xpath_int xpathctx
and xpath_int64 = xpath_int64 xpathctx in
(* Search for vm name. *)
let name =
match xpath_string "/ovf:Envelope/ovf:VirtualSystem/ovf:Name/text()" with
| None | Some "" -> None
| Some _ as name -> name in
(* Search for memory. *)
let memory = Option.value ~default:(1024L *^ 1024L) (xpath_int64 "/ovf:Envelope/ovf:VirtualSystem/ovf:VirtualHardwareSection/ovf:Item[rasd:ResourceType/text()=4]/rasd:VirtualQuantity/text()") in
let memory = memory *^ 1024L *^ 1024L in
(* Search for number of vCPUs. *)
let vcpu = Option.value ~default:1 (xpath_int "/ovf:Envelope/ovf:VirtualSystem/ovf:VirtualHardwareSection/ovf:Item[rasd:ResourceType/text()=3]/rasd:VirtualQuantity/text()") in
(* CPU topology. coresPerSocket is a VMware proprietary extension.
* I couldn't find out how hyperthreads is specified in the OVF.
*)
let cores_per_socket = xpath_int "/ovf:Envelope/ovf:VirtualSystem/ovf:VirtualHardwareSection/ovf:Item[rasd:ResourceType/text()=3]/vmw:CoresPerSocket/text()" in
let cpu_topology =
match cores_per_socket with
| None -> None
| Some cores_per_socket when cores_per_socket <= 0 ->
warning (f_"invalid vmw:CoresPerSocket (%d) ignored")
cores_per_socket;
None
| Some cores_per_socket ->
let sockets = vcpu / cores_per_socket in
if sockets <= 0 then (
warning (f_"invalid vmw:CoresPerSocket < number of cores");
None
)
else
Some { s_cpu_sockets = sockets; s_cpu_cores = cores_per_socket;
s_cpu_threads = 1 } in
(* BIOS or EFI firmware? *)
let firmware = Option.value ~default:"bios" (xpath_string "/ovf:Envelope/ovf:VirtualSystem/ovf:VirtualHardwareSection/vmw:Config[@vmw:key=\"firmware\"]/@vmw:value") in
let firmware =
match firmware with
| "bios" -> BIOS
| "efi" -> UEFI
| s ->
error (f_"unknown Config:firmware value %s (expected \"bios\" \
or \"efi\")") s in
name, memory, vcpu, cpu_topology, firmware,
parse_disks xpathctx, parse_removables xpathctx, parse_nics xpathctx
(* Hard disks (ResourceType = 17). *)
and parse_disks xpathctx =
let xpath_string = xpath_string xpathctx
and xpath_int = xpath_int xpathctx in
let disks = ref [] in
let expr = "/ovf:Envelope/ovf:VirtualSystem/ovf:VirtualHardwareSection/ovf:Item[rasd:ResourceType/text()=17]" in
let obj = Xml.xpath_eval_expression xpathctx expr in
let nr_nodes = Xml.xpathobj_nr_nodes obj in
for i = 0 to nr_nodes-1 do
let n = Xml.xpathobj_node obj i in
Xml.xpathctx_set_current_context xpathctx n;
(* XXX We assume the OVF lists these in order.
let address = xpath_int "rasd:AddressOnParent/text()" in
*)
(* Find the parent controller. *)
let parent_id = xpath_int "rasd:Parent/text()" in
let controller =
match parent_id with
| None -> None
| Some id -> parent_controller xpathctx id in
Xml.xpathctx_set_current_context xpathctx n;
let file_id =
Option.value ~default:"" (xpath_string "rasd:HostResource/text()") in
let rex = PCRE.compile "^(?:ovf:)?/disk/(.*)" in
if PCRE.matches rex file_id then (
(* Chase the references through to the actual file name. *)
let file_id = PCRE.sub 1 in
let expr = sprintf "/ovf:Envelope/ovf:DiskSection/ovf:Disk[@ovf:diskId='%s']/@ovf:fileRef" file_id in
let file_ref =
match xpath_string expr with
| None -> error (f_"error parsing disk fileRef")
| Some s -> s in
let expr = sprintf "/ovf:Envelope/ovf:References/ovf:File[@ovf:id='%s']/@ovf:href" file_ref in
let href =
match xpath_string expr with
| None -> error (f_"no href in ovf:File (id=%s)") file_ref
| Some s -> s in
let expr = sprintf "/ovf:Envelope/ovf:References/ovf:File[@ovf:id='%s']/@ovf:compression" file_ref in
let compressed =
match xpath_string expr with
| None | Some "identity" -> false
| Some "gzip" -> true
| Some s -> error (f_"unsupported compression in OVF: %s") s in
let disk = {
source_disk = {
s_disk_id = i;
s_controller = controller;
};
href = href;
compressed = compressed;
} in
List.push_front disk disks;
) else
error (f_"could not parse disk rasd:HostResource from OVF document")
done;
List.rev !disks
(* Floppies (ResourceType = 14), CDs (ResourceType = 15) and
* CDROMs (ResourceType = 16). (What is the difference?) Try hard
* to preserve the original ordering from the OVF.
*)
and parse_removables xpathctx =
let xpath_int = xpath_int xpathctx in
let removables = ref [] in
let expr = "/ovf:Envelope/ovf:VirtualSystem/ovf:VirtualHardwareSection/ovf:Item[rasd:ResourceType/text()=14 or rasd:ResourceType/text()=15 or rasd:ResourceType/text()=16]" in
let obj = Xml.xpath_eval_expression xpathctx expr in
let nr_nodes = Xml.xpathobj_nr_nodes obj in
for i = 0 to nr_nodes-1 do
let n = Xml.xpathobj_node obj i in
Xml.xpathctx_set_current_context xpathctx n;
let id =
match xpath_int "rasd:ResourceType/text()" with
| None -> assert false
| Some (14|15|16 as i) -> i
| Some _ -> assert false in
let slot = xpath_int "rasd:AddressOnParent/text()" in
(* Find the parent controller. *)
let parent_id = xpath_int "rasd:Parent/text()" in
let controller =
match parent_id with
| None -> None
| Some id -> parent_controller xpathctx id in
let typ =
match id with
| 14 -> Floppy
| 15 | 16 -> CDROM
| _ -> assert false in
let disk = {
s_removable_type = typ;
s_removable_controller = controller;
s_removable_slot = slot;
} in
List.push_front disk removables;
done;
List.rev !removables
(* Search for networks ResourceType: 10 *)
and parse_nics xpathctx =
let xpath_string = xpath_string xpathctx in
let nics = ref [] in
let expr = "/ovf:Envelope/ovf:VirtualSystem/ovf:VirtualHardwareSection/ovf:Item[rasd:ResourceType/text()=10]" in
let obj = Xml.xpath_eval_expression xpathctx expr in
let nr_nodes = Xml.xpathobj_nr_nodes obj in
for i = 0 to nr_nodes-1 do
let n = Xml.xpathobj_node obj i in
Xml.xpathctx_set_current_context xpathctx n;
let vnet, vnet_type =
match xpath_string "rasd:Connection/text()" with
| Some connection -> connection, Bridge
| None -> sprintf "eth%d" i, Network in
let mac = xpath_string "rasd:Address/text()" in
let nic_model =
match xpath_string "rasd:ResourceSubType/text()" with
| Some "E1000" -> Some Source_e1000
| Some model -> Some (Source_other_nic (String.lowercase_ascii model))
| None -> None in
let nic = {
s_mac = mac;
s_nic_model = nic_model;
s_vnet = vnet;
s_vnet_type = vnet_type
} in
List.push_front nic nics
done;
List.rev !nics
(* Helper function to return the parent controller of a disk. *)
and parent_controller xpathctx id =
let xpath_int = xpath_int xpathctx in
let expr = sprintf "/ovf:Envelope/ovf:VirtualSystem/ovf:VirtualHardwareSection/ovf:Item[rasd:InstanceID/text()=%d]/rasd:ResourceType/text()" id in
let controller = xpath_int expr in
(* 5: IDE, 6: SCSI controller, 20: SATA *)
match controller with
| Some 5 -> Some Source_IDE
| Some 6 -> Some Source_SCSI
| Some 20 -> Some Source_SATA
| None ->
warning (f_"ova disk has no parent controller, please report this as \
a bug supplying the *.ovf file extracted from the ova");
None
| Some controller ->
warning (f_"ova disk has an unknown VMware controller type (%d), please \
report this as a bug supplying the *.ovf file extracted \
from the ova")
controller;
None
let parse_disks ovf_filename =
let xpathctx = xpathctx_of_ovf ovf_filename in
parse_disks xpathctx