inspector: Display the new build ID field

libguestfs 1.49.8 adds a new API to read the build ID from guests
(especially for Windows).  If the new API is available and if it
returns a string other than "unknown", then print it in virt-inspector
output.

Reviewed-by: Laszlo Ersek <lersek@redhat.com>

inspector/inspector.c

@@ -447,6 +447,14 @@ output_root (xmlTextWriterPtr xo, char *root)
       single_element ("hostname", str);
     free (str);
 
+#ifdef GUESTFS_HAVE_INSPECT_GET_BUILD_ID
+    str = guestfs_inspect_get_build_id (g, root);
+    if (!str) exit (EXIT_FAILURE);
+    if (STRNEQ (str, "unknown"))
+      single_element ("build_id", str);
+    free (str);
+#endif
+
     str = guestfs_inspect_get_osinfo (g, root);
     if (!str) exit (EXIT_FAILURE);
     if (STRNEQ (str, "unknown"))

inspector/virt-inspector.rng

@@ -38,6 +38,7 @@
             <optional><ref name="ospackageformat"/></optional>
             <optional><ref name="ospackagemanagement"/></optional>
             <optional><element name="hostname"><text/></element></optional>
+            <optional><element name="build_id"><text/></element></optional>
             <optional><element name="osinfo"><text/></element></optional>
 
             <ref name="mountpoints"/>