Re: [PATCH] xl: don't output (null) target in domxml-to-native

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On Wed, Oct 19, 2016 at 12:10:00 +0200, Cédric Bosdonnat wrote:
> When converting a domain xml containing a CDROM device without
> any attached source, don't add a target=(null) to the libxl config
> disk definition: xen doesn't like it at all and would fail to start
> the domain.
> ---
>  src/xenconfig/xen_xl.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/src/xenconfig/xen_xl.c b/src/xenconfig/xen_xl.c
> index a06983e..db8cbf1 100644
> --- a/src/xenconfig/xen_xl.c
> +++ b/src/xenconfig/xen_xl.c
> @@ -1068,7 +1068,7 @@ xenFormatXLDisk(virConfValuePtr list, virDomainDiskDefPtr disk)
>  
>      /* devtype */
>      if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
> -        virBufferAddLit(&buf, "devtype=cdrom,");
> +        virBufferAddLit(&buf, "devtype=cdrom");

This ... 

>  
>      /*
>       * target
> @@ -1081,7 +1081,9 @@ xenFormatXLDisk(virConfValuePtr list, virDomainDiskDefPtr disk)
>      if (xenFormatXLDiskSrc(disk->src, &target) < 0)

... would drop the comma leading the disk source in cases when the CDROM
is actually full.

>          goto cleanup;
>  
> -    virBufferAsprintf(&buf, "target=%s", target);
> +    if (target) {
> +        virBufferAsprintf(&buf, ",target=%s", target);
> +    }

This fails syntax-check.

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