[Bug 1481295] Re: virt-manager after upgrade: Error polling connection 'qemu:///system': internal error: could not get interface XML description: File operation failed - Failed to read (null)

[Thomas Bruno]

Putthing this in debian/patch/fix-virtmanager and adding fix-virtmanager
to debian/patch/series solved this issue:

diff --git a/src/dutil_linux.c b/src/dutil_linux.c
index a3b0176..5d69d19 100644
--- a/src/dutil_linux.c
+++ b/src/dutil_linux.c
@@ -1041,7 +1041,14 @@ static void add_link_info(struct netcf *ncf,
     ERR_NOMEM(!path, ncf);
     state = read_file(path, &length);
     FREE(path);
-    ERR_THROW_STRERROR(!state, ncf, EFILE, "Failed to read %s", path);
+    if (!state) {
+        /* missing operstate is *not* an error. It could be due to an
+         * alias interface, which has not entry in /sys/class/net at
+         * all, for example.
+         */
+        state = strdup("");
+        ERR_NOMEM(!state, ncf);
+    }
     if ((nl = strchr(state, '\n')))
         *nl = 0;
     prop = xmlSetProp(link_node, BAD_CAST "state", BAD_CAST state);

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https://bugs.launchpad.net/bugs/1481295

Title:
  virt-manager after upgrade: Error polling connection 'qemu:///system':
  internal error: could not get interface XML description: File
  operation failed - Failed to read (null)

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