Re: [PATCH 13/19] qemu/dbus: keep a connection to the VM D-Bus

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On Wed, Jan 29, 2025 at 05:40:35PM +0400, marcandre.lureau@xxxxxxxxxx wrote:
> From: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
> 
> The following changes are going to communicate with the qemu-rdp server
> through the VM D-Bus bus, keep a connection for that and further usage.
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
> ---
>  src/qemu/qemu_dbus.c   | 22 +++++++++++++++++++---
>  src/qemu/qemu_domain.h |  2 ++
>  2 files changed, 21 insertions(+), 3 deletions(-)


> 
> diff --git a/src/qemu/qemu_dbus.c b/src/qemu/qemu_dbus.c
> index 06b655d870..4a019ae092 100644
> --- a/src/qemu/qemu_dbus.c
> +++ b/src/qemu/qemu_dbus.c

> @@ -175,11 +177,13 @@ qemuDBusStart(virQEMUDriver *driver,
>      g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
>      qemuDomainObjPrivate *priv = vm->privateData;
>      g_autoptr(virCommand) cmd = NULL;
> +    g_autoptr(GError) gerr = NULL;
>      g_autofree char *dbusDaemonPath = NULL;
>      g_autofree char *shortName = NULL;
>      g_autofree char *pidfile = NULL;
>      g_autofree char *configfile = NULL;
>      g_autofree char *sockpath = NULL;
> +    g_autofree char *address = NULL;
>      virTimeBackOffVar timebackoff;
>      const unsigned long long timeout = 500 * 1000; /* ms */
>      VIR_AUTOCLOSE errfd = -1;
> @@ -205,8 +209,9 @@ qemuDBusStart(virQEMUDriver *driver,
>      pidfile = qemuDBusCreatePidFilename(cfg, shortName);
>      configfile = qemuDBusCreateConfPath(cfg, shortName);
>      sockpath = qemuDBusCreateSocketPath(cfg, shortName);
> +    address = g_strdup_printf("unix:path=%s", sockpath);
>  
> -    if (qemuDBusWriteConfig(configfile, sockpath) < 0) {
> +    if (qemuDBusWriteConfig(configfile, address) < 0) {
>          virReportSystemError(errno, _("Failed to write '%1$s'"), configfile);
>          return -1;
>      }
> @@ -264,6 +269,17 @@ qemuDBusStart(virQEMUDriver *driver,
>      if (qemuSecurityDomainSetPathLabel(driver, vm, sockpath, false) < 0)
>          goto cleanup;
>  
> +    priv->dbusConnection =
> +        g_dbus_connection_new_for_address_sync(address,
> +                                               G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT|
> +                                               G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
> +                                               NULL, NULL, &gerr);

We have just started dbus-daemon above here. We've proved the PID is running
but can you confirm this guarantees the listener socket is accepting
connections... that we're just about to establish.

> +    if (!priv->dbusConnection) {
> +        virReportError(VIR_ERR_OPERATION_FAILED,
> +                      _("Failed to connect to dbus-daemon: %1$s"), gerr->message);
> +        goto cleanup;
> +    }
> +
>      priv->dbusDaemonRunning = true;
>      ret = 0;
>   cleanup:

With regards,
Daniel
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