[Libguestfs] [PATCH v4 12/12] v2v: nbdkit: Add the retry filter unconditionally if it exists.

[Richard W.M. Jones]

This experimental filter can be used to work around brief
interruptions in service, such as the network going down, firewalls
timing out connections etc., without requiring virt-v2v to be rerun.
---
 v2v/nbdkit.ml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/v2v/nbdkit.ml b/v2v/nbdkit.ml
index 776eedce0..4866d3836 100644
--- a/v2v/nbdkit.ml
+++ b/v2v/nbdkit.ml
@@ -168,6 +168,13 @@ let common_create ?bandwidth plugin_name plugin_args plugin_env =
     )
     else [] in
 
+  (* Retry filter (if it exists) can be used to get around brief
+   * interruptions in service.  It must be closest to the plugin.
+   *)
+  if Sys.file_exists (filterdir // "nbdkit-retry-filter.so") then (
+    add_arg "--filter"; add_arg "retry"
+  );
+
   let args = get_args () @ [ plugin_name ] @ plugin_args @ rate_args in
 
   { plugin_name; args; env; dump_config; dump_plugin; filterdir }
-- 
2.23.0