[libvirt PATCH v2 2/5] qemu_monitor_json: Add qemuMonitorJSONGetMigrationBlockers

[Eugenio Pérez <eperezma@xxxxxxxxxx>]

This will allow qemuMigrationSrcIsAllowed to dynamically ask for
migration blockers, reducing duplication.

Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
---
 src/qemu/qemu_monitor_json.c | 35 +++++++++++++++++++++++++++++++++++
 src/qemu/qemu_monitor_json.h |  3 +++
 2 files changed, 38 insertions(+)

diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 5e4a86e5ad..a53d721720 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -3338,6 +3338,41 @@ int qemuMonitorJSONMigrate(qemuMonitor *mon,
     return 0;
 }
 
+int qemuMonitorJSONGetMigrationBlockers(qemuMonitor *mon,
+                                        char ***blockers)
+{
+    g_autoptr(virJSONValue) cmd = NULL;
+    g_autoptr(virJSONValue) reply = NULL;
+    virJSONValue *data;
+    virJSONValue *jblockers;
+    size_t i;
+
+    if (!(cmd = qemuMonitorJSONMakeCommand("query-migrate", NULL)))
+        return -1;
+
+    if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
+        return -1;
+
+    if (qemuMonitorJSONCheckReply(cmd, reply, VIR_JSON_TYPE_OBJECT) < 0)
+        return -1;
+
+    data = virJSONValueObjectGetObject(reply, "return");
+
+    if (!(jblockers = virJSONValueObjectGetArray(data, "blocked-reasons")))
+        return -1;
+
+    /* NULL terminated array */
+    *blockers = g_new0(char *, virJSONValueArraySize(jblockers) + 1);
+    for (i = 0; i < virJSONValueArraySize(jblockers); i++) {
+        virJSONValue *jblocker = virJSONValueArrayGet(jblockers, i);
+        const char *blocker = virJSONValueGetString(jblocker);
+
+        (*blockers)[i] = g_strdup(blocker);
+    }
+
+    return 0;
+}
+
 int qemuMonitorJSONMigrateCancel(qemuMonitor *mon)
 {
     g_autoptr(virJSONValue) cmd = qemuMonitorJSONMakeCommand("migrate_cancel", NULL);
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index 2759566892..e4c65e250e 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -184,6 +184,9 @@ qemuMonitorJSONMigrate(qemuMonitor *mon,
                        unsigned int flags,
                        const char *uri);
 int
+qemuMonitorJSONGetMigrationBlockers(qemuMonitor *mon,
+                                    char ***blockers);
+int
 qemuMonitorJSONGetSpiceMigrationStatus(qemuMonitor *mon,
                                        bool *spice_migrated);
 
-- 
2.31.1