[Libguestfs] [PATCH v2] v2v: allow configurable location for virtio drivers

[Roman Kagan]

Make the location of the Windows virtio drivers overridable with the
environment variable VIRTIO_WIN_DIR, in the same vein as is done for
virt-tools.

Signed-off-by: Roman Kagan <rkagan at parallels.com>
---
changes from v1:
 - document the new environment variable

 v2v/convert_windows.ml |  4 +++-
 v2v/virt-v2v.pod       | 10 ++++++++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/v2v/convert_windows.ml b/v2v/convert_windows.ml
index 0cd818a..e966341 100644
--- a/v2v/convert_windows.ml
+++ b/v2v/convert_windows.ml
@@ -47,7 +47,9 @@ let convert ~verbose ~keep_serial_console (g : G.guestfs) inspect source =
     try Sys.getenv "VIRT_TOOLS_DATA_DIR"
     with Not_found -> Config.datadir // "virt-tools" in
 
-  let virtio_win_dir = "/usr/share/virtio-win" in
+  let virtio_win_dir =
+    try Sys.getenv "VIRTIO_WIN_DIR"
+    with Not_found -> Config.datadir // "virtio-win" in
 
   (* Check if RHEV-APT exists.  This is optional. *)
   let rhev_apt_exe = virt_tools_data_dir // "rhev-apt.exe" in
diff --git a/v2v/virt-v2v.pod b/v2v/virt-v2v.pod
index 7b6419e..4f7088c 100644
--- a/v2v/virt-v2v.pod
+++ b/v2v/virt-v2v.pod
@@ -720,8 +720,9 @@ below.
  
  OpenSUSE 10    kernel >= 2.6.25.5-1.1
 
- Windows        Drivers are installed from /usr/share/virtio-win
-                if present
+ Windows        Drivers are installed from the directory pointed to by
+                "VIRTIO_WIN_DIR" environment variable
+                (/usr/share/virtio-win by default) if present
 
 =head1 RHEL 4
 
@@ -1500,6 +1501,11 @@ not distributed with virt-v2v.
 
 =back
 
+=item C<VIRTIO_WIN_DIR>
+
+This is where VirtIO drivers for Windows are searched for
+(F</usr/share/virtio-win> if unset).  See L<ENABLING VIRTIO>.
+
 =back
 
 For other environment variables, see L<guestfs(3)/ENVIRONMENT VARIABLES>.
-- 
2.1.0