[RFC 04/41] qom/object: Introduce helper to resolve path from non-direct parent

[Zhao Liu <zhao1.liu@linux.intel.com>]

From: Zhao Liu <zhao1.liu@intel.com>

When we support child<> property creation from cli, the peripheral
container (/machine/peripheral) may not be the direct parent of the
devices created from cli.

For this case, add a helper to resolve path from non-direct parent.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 include/qom/object.h | 15 +++++++++++++++
 qom/object.c         | 18 ++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/include/qom/object.h b/include/qom/object.h
index afccd24ca7ab..494eef801be3 100644
--- a/include/qom/object.h
+++ b/include/qom/object.h
@@ -1562,6 +1562,21 @@ Object *object_resolve_path_type(const char *path, const char *typename,
  */
 Object *object_resolve_path_at(Object *parent, const char *path);
 
+/**
+ * object_resolve_path_from:
+ * @parent: the object from which to resolve the path
+ * @path: the path to resolve
+ * @ambiguous: returns true if the path resolution failed because of an
+ *   ambiguous match
+ *
+ * This is like object_resolve_path_at(), except @parent may be the
+ * partial parent of @path.
+ *
+ * Returns: The resolved object or NULL on path lookup failure.
+ */
+Object *object_resolve_path_from(Object *parent, const char *path,
+                                 bool *ambiguous);
+
 /**
  * object_resolve_path_component:
  * @parent: the object in which to resolve the path
diff --git a/qom/object.c b/qom/object.c
index 95c0dc8285fe..da29e88816b5 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -2192,6 +2192,24 @@ Object *object_resolve_path_at(Object *parent, const char *path)
     return object_resolve_abs_path(parent, parts, TYPE_OBJECT);
 }
 
+Object *object_resolve_path_from(Object *parent, const char *path,
+                                 bool *ambiguousp)
+{
+    g_auto(GStrv) parts = NULL;
+    bool ambiguous = false;
+    Object *obj;
+
+    parts = g_strsplit(path, "/", 0);
+    assert(parts);
+
+    obj = object_resolve_partial_path(parent, parts, TYPE_OBJECT,
+                                      &ambiguous);
+    if (ambiguousp) {
+        *ambiguousp = ambiguous;
+    }
+    return obj;
+}
+
 typedef struct StringProperty
 {
     char *(*get)(Object *, Error **);
-- 
2.34.1