[Qemu-devel] [PATCH] monitor: allow object_del & device_del to accept QOM paths

[Daniel P. Berrange]

Currently both object_del and device_del require that the
client provide the object/device short ID. While user
creatable objects require an ID to be provided at time of
creation, qdev devices may be created without giving an
ID. The only unique identifier they would then have is the
QOM object path.

Allowing device_del to accept an object path ensures all
devices are deletable regardless of whether they have an
ID.

 (qemu) device_add usb-mouse
 (qemu) qom-list /machine/peripheral-anon
 device[0] (child<usb-mouse>)
 type (string)
 (qemu) device_del /machine/peripheral-anon/device[0]

Although objects require an ID to be provided upfront,
there may be cases where the client would prefer to
use QOM paths when deleting.

Signed-off-by: Daniel P. Berrange <address@hidden>
---
 hmp-commands.hx |  6 ++++--
 qdev-monitor.c  | 14 +++++++++-----
 qmp-commands.hx | 17 +++++++++++++----
 qmp.c           | 10 +++++++---
 4 files changed, 33 insertions(+), 14 deletions(-)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index d3b7932..c0c113d 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -675,7 +675,8 @@ ETEXI
 STEXI
 @item device_del @var{id}
 @findex device_del
-Remove device @var{id}.
+Remove device @var{id}. @var{id} may be a short ID
+or a QOM object path.
 ETEXI
 
     {
@@ -1279,7 +1280,8 @@ ETEXI
 STEXI
 @item object_del
 @findex object_del
-Destroy QOM object.
+Destroy QOM object. @var{id} may be a short ID
+or a QOM object path.
 ETEXI
 
 #ifdef CONFIG_SLIRP
diff --git a/qdev-monitor.c b/qdev-monitor.c
index f9e2d62..894b799 100644
--- a/qdev-monitor.c
+++ b/qdev-monitor.c
@@ -785,13 +785,17 @@ void qmp_device_add(QDict *qdict, QObject **ret_data, 
Error **errp)
 void qmp_device_del(const char *id, Error **errp)
 {
     Object *obj;
-    char *root_path = object_get_canonical_path(qdev_get_peripheral());
-    char *path = g_strdup_printf("%s/%s", root_path, id);
 
-    g_free(root_path);
-    obj = object_resolve_path_type(path, TYPE_DEVICE, NULL);
-    g_free(path);
+    if (id[0] == '/') {
+        obj = object_resolve_path(id, NULL);
+    } else {
+        char *root_path = object_get_canonical_path(qdev_get_peripheral());
+        char *path = g_strdup_printf("%s/%s", root_path, id);
 
+        g_free(root_path);
+        obj = object_resolve_path_type(path, TYPE_DEVICE, NULL);
+        g_free(path);
+    }
     if (!obj) {
         error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
                   "Device '%s' not found", id);
diff --git a/qmp-commands.hx b/qmp-commands.hx
index ba630b1..d3070cf 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -321,14 +321,19 @@ Remove a device.
 
 Arguments:
 
-- "id": the device's ID (json-string)
-
+- "id": the device's ID or QOM path (json-string)
+EQ
 Example:
 
 -> { "execute": "device_del", "arguments": { "id": "net1" } }
 <- { "return": {} }
 
-EQMP
+Example:
+
+-> { "execute": "device_del", "arguments": { "id": 
"/machine/peripheral-anon/device[0]" } }
+<- { "return": {} }
+
+MP
 
     {
         .name       = "send-key",
@@ -965,7 +970,7 @@ Remove QOM object.
 
 Arguments:
 
-- "id": the object's ID (json-string)
+- "id": the object's ID or QOM path (json-string)
 
 Example:
 
@@ -973,6 +978,10 @@ Example:
 <- { "return": {} }
 
 
+-> { "execute": "object-del", "arguments": { "id": "/objects/hostmem1" } }
+<- { "return": {} }
+
+
 EQMP
 
 
diff --git a/qmp.c b/qmp.c
index 403805a..11e9f51 100644
--- a/qmp.c
+++ b/qmp.c
@@ -678,11 +678,15 @@ void qmp_object_add(QDict *qdict, QObject **ret, Error 
**errp)
 
 void qmp_object_del(const char *id, Error **errp)
 {
-    Object *container;
     Object *obj;
 
-    container = object_get_objects_root();
-    obj = object_resolve_path_component(container, id);
+    if (id[0] == '/') {
+        obj = object_resolve_path(id, NULL);
+    } else {
+        Object *container;
+        container = object_get_objects_root();
+        obj = object_resolve_path_component(container, id);
+    }
     if (!obj) {
         error_setg(errp, "object id not found");
         return;
-- 
2.4.3