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Re: [Libguestfs] [PATCH 5/8] v2v: add output#disk_copied hook



On Mon, Sep 16, 2019 at 07:13:48PM +0200, Pino Toscano wrote:
> Add a simple method in the Output class to do work right after a disk
> was successfully copied.
> ---
>  v2v/types.ml  | 1 +
>  v2v/types.mli | 4 ++++
>  v2v/v2v.ml    | 9 ++++++++-
>  3 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/v2v/types.ml b/v2v/types.ml
> index 77f879200..714b30014 100644
> --- a/v2v/types.ml
> +++ b/v2v/types.ml
> @@ -521,6 +521,7 @@ class virtual output = object
>    method override_output_format (_ : overlay) = (None : string option)
>    method virtual prepare_targets : source -> (string * overlay) list -> target_buses -> guestcaps -> inspect -> target_firmware -> target_file list
>    method disk_create = (open_guestfs ())#disk_create
> +  method disk_copied (_ : target) (_ : int) (_ : int) = ()
>    method virtual create_metadata : source -> target list -> target_buses -> guestcaps -> inspect -> target_firmware -> unit
>    method keep_serial_console = true
>    method install_rhev_apt = false
> diff --git a/v2v/types.mli b/v2v/types.mli
> index be9406100..bf573d56d 100644
> --- a/v2v/types.mli
> +++ b/v2v/types.mli
> @@ -485,6 +485,10 @@ class virtual output : object
>    (** Called in order to create disks on the target.  The method has the
>        same signature as Guestfs#disk_create.  Normally you should {b not}
>        define this since the default method calls Guestfs#disk_create. *)
> +  method disk_copied : target -> int -> int -> unit
> +  (** Called after a disk was successfully copied on the target.
> +      The second parameter is the index of the copied disk (starting
> +      from 0), and the third is the number of disks in total. *)
>    method virtual create_metadata : source -> target list -> target_buses -> guestcaps -> inspect -> target_firmware -> unit
>    (** Called after conversion and copying to create metadata and
>        do any finalization. *)
> diff --git a/v2v/v2v.ml b/v2v/v2v.ml
> index c056aa787..4ee15663f 100644
> --- a/v2v/v2v.ml
> +++ b/v2v/v2v.ml
> @@ -792,7 +792,14 @@ and copy_targets cmdline targets input output =
>              pc;
>            if pc < 0. then eprintf " ! ESTIMATE TOO LOW !";
>            eprintf "\n%!";
> -      )
> +      );
> +
> +      (* Let the output mode know that the disk was copied successfully,
> +       * so it can perform any operations without waiting for all the
> +       * other disks to be copied (i.e. before the metadata is actually
> +       * created).
> +       *)
> +      output#disk_copied t i nr_disks
>    ) targets
>  
>  (* Update the target_actual_size field in the target structure. *)

There's a Unicode-art diagram in v2v/types.mli which also should
be updated:

https://github.com/libguestfs/libguestfs/blob/dea9636c596acd030c9955057863cf080bdd89fb/v2v/types.mli#L419

ACK if you also update this diagram.

Rich.

-- 
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