[libvirt] [PATCH] virsh: Fix domdisplay when domain only uses TLS

[Christophe Fergeau]

It's possible to create a domain which will only use a TLS port
and will not have a non-TLS port set by using:
<graphics type='spice' autoport='yes' defaultMode='secure'/>
In such a setup, the 'graphics' node for the running domain will be:
<graphics type='spice' tlsPort='5900'
          autoport='yes' listen='127.0.0.1'
          defaultMode='secure'>

However, cmdDomDisplay loops over all the 'graphics' node, and it
ignores nodes which don't have a 'port' attribute. This means
'virsh domdisplay' will only return an empty string for domains
as the one above.

This commit looks for both 'port' and 'tlsPort' before deciding
to ignore a graphics node. It also makes sure 'port' is not printed
when it's not set.
This makes 'virsh domdisplay' return
'spice://127.0.0.1?tls-port=5900' for domains using only a TLS
port.

Signed-off-by: Christophe Fergeau <cfergeau at redhat.com>
---
 tools/virsh-domain.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 856e888..5e9d784 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -9073,6 +9073,20 @@ cmdDomDisplay(vshControl *ctl, const vshCmd *cmd)
         /* If there is no port number for this type, then jump to the next
          * scheme */
         if (tmp)
+            port = 0;
+
+        /* Create our XPATH lookup for TLS Port (automatically skipped
+         * for unsupported schemes */
+        if (virAsprintf(&xpath, xpath_fmt, scheme[iter], "tlsPort") < 0)
+            goto cleanup;
+
+        /* Attempt to get the TLS port number */
+        tmp = virXPathInt(xpath, ctxt, &tls_port);
+        VIR_FREE(xpath);
+        if (tmp)
+            tls_port = 0;
+
+        if (!port && !tls_port)
             continue;
 
         /* Create our XPATH lookup for the current display's address */
@@ -9103,17 +9117,6 @@ cmdDomDisplay(vshControl *ctl, const vshCmd *cmd)
             port -= 5900;
         }
 
-        /* Create our XPATH lookup for TLS Port (automatically skipped
-         * for unsupported schemes */
-        if (virAsprintf(&xpath, xpath_fmt, scheme[iter], "tlsPort") < 0)
-            goto cleanup;
-
-        /* Attempt to get the TLS port number */
-        tmp = virXPathInt(xpath, ctxt, &tls_port);
-        VIR_FREE(xpath);
-        if (tmp)
-            tls_port = 0;
-
         /* Build up the full URI, starting with the scheme */
         virBufferAsprintf(&buf, "%s://", scheme[iter]);
 
@@ -9128,7 +9131,8 @@ cmdDomDisplay(vshControl *ctl, const vshCmd *cmd)
             virBufferAsprintf(&buf, "%s", listen_addr);
 
         /* Add the port */
-        virBufferAsprintf(&buf, ":%d", port);
+        if (port)
+            virBufferAsprintf(&buf, ":%d", port);
 
         /* TLS Port */
         if (tls_port) {
-- 
1.8.3.1