[Libguestfs] [PATCH v2v 2/3] lib/qemuNBD.ml: Use qemu-nbd --shared=0 flag to allow multiple connections

qemu-nbd --shared (-e) flag controls how many clients can connect concurrently. 0 means unlimited. We want to allow the sockets to be queried by other processes while virt-v2v is running and it should be safe to do this. The default configuration of qemu-nbd doesn't allow this so add --shared=0. Note this does not (in current qemu) enable multi-conn because we aren't using the -r (read-only) flag. --- lib/qemuNBD.ml | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/lib/qemuNBD.ml b/lib/qemuNBD.ml index 12d083aeb7..89c93d7072 100644 --- a/lib/qemuNBD.ml +++ b/lib/qemuNBD.ml @@ -90,7 +90,11 @@ let run_unix ?socket { disk; snapshot; format } = (* Construct the qemu-nbd command line. *) let args = ref [] in List.push_back_list args - ["qemu-nbd"; "-t"; "--pid-file"; pidfile; "--socket"; socket]; + ["qemu-nbd"; + "-t"; + "--shared=0"; + "--pid-file"; pidfile; + "--socket"; socket]; (* -s adds a protective overlay. *) if snapshot then List.push_back args "-s"; -- 2.32.0