[libvirt] [PATCH] qemu: set bind mode for chardev while parsing XML

[Michal Privoznik]

On 08/30/2017 04:49 PM, Pavel Hrdina wrote:
> Currently while parsing domain XML we clear the UNIX path if it matches
> one of the auto-generated paths by libvirt.  After that when the guest
> is started new path is generated but the mode is also changed to "bind".
> 
> In the real-world use-case the mode should not change, it only happens
> if a user provides a mode='connect' and path that matches one of the
> auto-generated path or not provides a path at all.
> 
> Before *reconnect* feature was introduced there was no issue, but with
> the new feature we need to make sure that it's used only with "connect"
> mode, therefore we need to move the mode change into parsing in order
> to have a proper error reported by validation code.
> 
> Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
> ---
>  src/conf/domain_conf.c                             |  8 ++++++++
>  src/qemu/qemu_domain.c                             |  6 +++---
>  ...muxml2argv-chardev-reconnect-generated-path.xml | 23 ++++++++++++++++++++++
>  tests/qemuxml2argvtest.c                           |  3 +++
>  4 files changed, 37 insertions(+), 3 deletions(-)
>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-chardev-reconnect-generated-path.xml
> 
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index f7574d77b6..9fdd0f90fc 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -4421,6 +4421,14 @@ virDomainDeviceDefPostParseCommon(virDomainDeviceDefPtr dev,
>  
>              chr->target.port = maxport + 1;
>          }
> +
> +        /* For UNIX chardev if no path is provided we generate one.
> +         * This also implies that the mode is 'bind'. */
> +        if (chr->source &&
> +            chr->source->type == VIR_DOMAIN_CHR_TYPE_UNIX &&
> +            !chr->source->data.nix.path) {
> +            chr->source->data.nix.listen = true;
> +        }
>      }

This hunk should go somewhere under src/qemu/ because leaving it here
enables this for all the drivers. qemuDomainDeviceDefPostParse() looks
like a good candidate.

Michal