[libvirt] [RFC PATCHv4 15/15] qemu: support fd: migration with compression

[Daniel P. Berrange]

On Wed, Mar 09, 2011 at 07:18:33PM -0700, Eric Blake wrote:
> Spawn the compressor ourselves, instead of requiring the shell.
> 
> * src/qemu/qemu_driver.c (qemuDomainMigrateToFile): Spawn
> compression helper process when needed.
> ---
>  src/qemu/qemu_driver.c |   37 ++++++++++++++++++++++++++++++++-----
>  1 files changed, 32 insertions(+), 5 deletions(-)

ACK

>  cleanup:
> +    VIR_FORCE_CLOSE(pipeFD[0]);
> +    VIR_FORCE_CLOSE(pipeFD[1]);
> +    /* FIXME - virCommandWait can overwrite errors; need to add
> +     * virCommandKill that does the job silently */
> +    ignore_value(virCommandWait(cmd, NULL));
> +    virCommandFree(cmd);

You can do

   virErrorPtr orig_err;
   ...
  cleanup:
   orig_err = virSaveLastError();

   ...code which may overwrite errors...

   if (orig_err) {
        virSetError(orig_err);
        virFreeError(orig_err);
   }

REgards,
Daniel
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