RHEL 8: v2v: rhv-upload: Remove restriction on -oa sparse.

See: https://bugzilla.redhat.com/show_bug.cgi?id=1565681
and the v2v-devel private thread "Do we already support migration using FC?"

v2v/output_rhv_upload.ml

@@ -177,19 +177,11 @@ See also the virt-v2v-output-rhv(1) manual.")
       error (f_"nbdkit was compiled without SELinux support.  You will have to recompile nbdkit with libselinux-devel installed, or else set SELinux to Permissive mode while doing the conversion.")
   in
 
-  (* Output format/sparse must be raw/sparse.  We may be able to
-   * lift this limitation in future, but it requires changes on the
-   * RHV side.  See TODO file for details.  XXX
-   *)
+  (* Output format must be raw. *)
   let error_current_limitation required_param =
     error (f_"rhv-upload: currently you must use ‘%s’.  This restriction will be loosened in a future version.") required_param
   in
 
-  let error_unless_output_alloc_sparse () =
-    if output_alloc <> Sparse then
-      error_current_limitation "-oa sparse"
-  in
-
   (* JSON parameters which are invariant between disks. *)
   let json_params = [
     "verbose", JSON.Bool (verbose ());
@@ -249,7 +241,6 @@ object
     error_unless_ovirtsdk4_module_available ();
     error_unless_nbdkit_working ();
     error_unless_nbdkit_python_plugin_working ();
-    error_unless_output_alloc_sparse ();
     (* Python code prechecks. *)
     let precheck_fn = tmpdir // "v2vprecheck.json" in
     let fd = Unix.openfile precheck_fn [O_WRONLY; O_CREAT] 0o600 in

v2v/rhv-upload-plugin.py

@@ -142,10 +142,8 @@ def open(readonly):
             format = disk_format,
             initial_size = params['disk_size'],
             provisioned_size = params['disk_size'],
-            # XXX Ignores params['output_sparse'].
-            # Handling this properly will be complex, see:
             # https://www.redhat.com/archives/libguestfs/2018-March/msg00177.html
-            sparse = True,
+            sparse = params['output_sparse'],
             storage_domains = [
                 types.StorageDomain(
                     name = params['output_storage'],

v2v/virt-v2v-output-rhv.pod

@@ -5,7 +5,7 @@ virt-v2v-output-rhv - Using virt-v2v to convert guests to oVirt or RHV
 =head1 SYNOPSIS
 
  virt-v2v [-i* options] -o rhv-upload [-oc ENGINE_URL] -os STORAGE
-                        [-op PASSWORD] [-of raw]
+                        [-op PASSWORD]
                         [-oo rhv-cafile=FILE]
                         [-oo rhv-cluster=CLUSTER]
                         [-oo rhv-direct]
@@ -79,12 +79,6 @@ username is not specified then virt-v2v defaults to using
 C<admin@internal> which is the typical superuser account for oVirt
 instances.
 
-=item I<-of raw>
-
-Currently you must use I<-of raw> and you cannot use I<-oa preallocated>.
-
-These restrictions will be loosened in a future version.
-
 =item I<-op> F<password-file>
 
 A file containing a password to be used when connecting to the oVirt