From 3a937f3fac910fa7109f7edd0608388f52bec95e Mon Sep 17 00:00:00 2001

From: "Richard W.M. Jones" <rjones@redhat.com>

Date: Fri, 9 Oct 2015 12:22:52 +0100

Subject: [PATCH] v2v: Use libvirt-supplied <vmware:datacenterpath> if

 available.

In libvirt >= 1.2.20, the VMware libvirt driver supplies the correct

dcPath to use via <vmware:datacenterpath> in the libvirt XML.  If

libvirt passes us this element, use it.

This code still allows the user to override dcPath using the --dcPath

option on the command line, but that's mainly for safety so we can fix

any problems in virt-v2v or libvirt in the field.  As we get more

confident in libvirt and as libvirt 1.2.20 is more widely adopted, we

will be able to deprecate this parameter entirely.

Thanks: Matthias Bolte for adding the <vmware:datacenterpath> element

to libvirt in

https://libvirt.org/git/?p=libvirt.git;a=commit;h=636a99058758a0447482f3baad94de8de3ab1151

(cherry picked from commit ffea9f97926efc45c894a113b65b2ff467d91b04)

---

 v2v/input_libvirt_vcenter_https.ml | 52 +++++++++++++++++++++++++-------------

 v2v/virt-v2v.pod                   |  9 +++----

 2 files changed, 38 insertions(+), 23 deletions(-)

diff --git a/v2v/input_libvirt_vcenter_https.ml b/v2v/input_libvirt_vcenter_https.ml

index 684a7e4..25a8ee9 100644

--- a/v2v/input_libvirt_vcenter_https.ml

+++ b/v2v/input_libvirt_vcenter_https.ml

@@ -192,9 +192,7 @@ let get_dcPath uri scheme =

        * However if there is a cluster involved then the URI may be

        * /Folder/Datacenter/Cluster/esxi but dcPath=Folder/Datacenter/Cluster

        * won't work.  In this case the user has to adjust the path to

-       * remove the Cluster name (which still works in libvirt).  There

-       * should be a way to ask the libvirt vpx driver for the correct

-       * path, but there isn't. XXX  See also RHBZ#1256823.

+       * remove the Cluster name (which still works in libvirt).

        *)

       (* Collapse multiple slashes to single slash. *)

       let path = Str.global_replace multiple_slash "/" path in

@@ -242,19 +240,6 @@ let map_source_to_uri ?readahead verbose dcPath password uri scheme server path

     let datastore = Str.matched_group 1 path

     and path = Str.matched_group 2 path in

-    (* Get the dcPath. *)

-    let dcPath =

-      match dcPath with

-      | None ->

-         let dcPath = get_dcPath uri scheme in

-         if verbose then

-           printf "vcenter: calculated dcPath as: %s\n" dcPath;

-         dcPath

-      | Some dcPath ->

-         if verbose then

-           printf "vcenter: using --dcpath from the command line: %s\n" dcPath;

-         dcPath in

-

     let port =

       match uri.uri_port with

       | 443 -> ""

@@ -317,11 +302,12 @@ let map_source_to_uri ?readahead verbose dcPath password uri scheme server path

 (* Subclass specialized for handling VMware vCenter over https. *)

 class input_libvirt_vcenter_https

-  verbose dcPath password libvirt_uri parsed_uri scheme server guest =

+  verbose cmdline_dcPath password libvirt_uri parsed_uri scheme server guest =

 object

   inherit input_libvirt verbose password libvirt_uri guest

   val saved_source_paths = Hashtbl.create 13

+  val mutable dcPath = ""

   method source () =

     if verbose then

@@ -336,6 +322,38 @@ object

     let xml = Domainxml.dumpxml ?password ?conn:libvirt_uri guest in

     let source, disks = parse_libvirt_xml ?conn:libvirt_uri ~verbose xml in

+    (* Find the <vmware:datacenterpath> element from the XML, if it

+     * exists.  This was added in libvirt >= 1.2.20.

+     *)

+    let xml_dcPath =

+      let doc = Xml.parse_memory xml in

+      let xpathctx = Xml.xpath_new_context doc in

+      Xml.xpath_register_ns xpathctx

+        "vmware" "http://libvirt.org/schemas/domain/vmware/1.0";

+      let xpath_string = xpath_string xpathctx in

+      xpath_string "/domain/vmware:datacenterpath" in

+

+    (* Calculate the dcPath we're going to use. *)

+    dcPath <- (

+      match cmdline_dcPath, xml_dcPath with

+      (* Command line --dcpath parameter overrides everything, allowing

+       * users to correct any mistakes in v2v or libvirt.

+       *)

+      | Some p, (None|Some _) ->

+         if verbose then

+           printf "vcenter: using --dcpath from the command line: %s\n" p;

+         p

+      | None, Some p ->

+         if verbose then

+           printf "vcenter: using <vmware:datacenterpath> from libvirt: %s\n" p;

+         p

+      | None, None ->

+         let p = get_dcPath parsed_uri scheme in

+         if verbose then

+           printf "vcenter: guessed dcPath from URI: %s\n" p;

+         p

+    );

+

     (* Save the original source paths, so that we can remap them again

      * in [#adjust_overlay_parameters].

      *)

diff --git a/v2v/virt-v2v.pod b/v2v/virt-v2v.pod

index 2e257de..b8caebc 100644

--- a/v2v/virt-v2v.pod

+++ b/v2v/virt-v2v.pod

@@ -155,6 +155,9 @@ See I<--network> below.

 =item B<--dcpath> Folder/Datacenter

+B<NB:> You don't need to use this parameter if you have

+S<libvirt E<ge> 1.2.17-13.el7_2.4>.

+

 For VMware vCenter, override the C<dcPath=...> parameter used to

 select the datacenter.  Virt-v2v can usually calculate this from the

 C<vpx://> URI, but if it gets it wrong, then you can override it using

@@ -845,12 +848,6 @@ added to the URI, eg:

  vpx://user@server/Folder/Datacenter/esxi

-Virt-v2v needs to calculate the C<dcPath> parameter from the URI, and

-it does this by removing the final C</esxi> element, so in the above

-example C<dcPath=Folder/Datacenter>.  As it is not always possible to

-correctly calculate C<dcPath> from the URI, you can override this

-using the I<--dcpath> parameter.

-

 For full details of libvirt URIs, see: L<http://libvirt.org/drvesx.html>

 Typical errors from libvirt / virsh when the URI is wrong include:

-- 

1.8.3.1