qemu: Add support for virDomainGetMetadata and virDomainSetMetadata

This patch adds support for the new api into the qemu driver to support
modification and retrieval of domain description and title. This patch
does not add support for modifying the <metadata> element.

src/qemu/qemu_driver.c

@@ -11813,6 +11813,178 @@ cleanup:
     return ret;
 }
 
+static int
+qemuDomainSetMetadata(virDomainPtr dom,
+                      int type,
+                      const char *metadata,
+                      const char *key ATTRIBUTE_UNUSED,
+                      const char *uri ATTRIBUTE_UNUSED,
+                      unsigned int flags)
+{
+    struct qemud_driver *driver = dom->conn->privateData;
+    virDomainObjPtr vm;
+    virDomainDefPtr persistentDef;
+    int ret = -1;
+
+    virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
+                  VIR_DOMAIN_AFFECT_CONFIG, -1);
+
+    qemuDriverLock(driver);
+    vm = virDomainFindByUUID(&driver->domains, dom->uuid);
+    qemuDriverUnlock(driver);
+
+    if (!vm) {
+        char uuidstr[VIR_UUID_STRING_BUFLEN];
+        virUUIDFormat(dom->uuid, uuidstr);
+        qemuReportError(VIR_ERR_NO_DOMAIN,
+                        _("no domain with matching uuid '%s'"), uuidstr);
+        goto cleanup;
+    }
+
+    if (virDomainLiveConfigHelperMethod(driver->caps, vm, &flags,
+                                        &persistentDef) < 0)
+        goto cleanup;
+
+    if (flags & VIR_DOMAIN_AFFECT_LIVE) {
+        switch ((virDomainMetadataType) type) {
+        case VIR_DOMAIN_METADATA_DESCRIPTION:
+            VIR_FREE(vm->def->description);
+            if (metadata &&
+                !(vm->def->description = strdup(metadata)))
+                goto no_memory;
+            break;
+        case VIR_DOMAIN_METADATA_TITLE:
+            VIR_FREE(vm->def->title);
+            if (metadata &&
+                !(vm->def->title = strdup(metadata)))
+                goto no_memory;
+            break;
+        case VIR_DOMAIN_METADATA_ELEMENT:
+            qemuReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
+                            _("QEmu driver does not support modifying"
+                              "<metadata> element"));
+            goto cleanup;
+            break;
+        default:
+            qemuReportError(VIR_ERR_INVALID_ARG, "%s",
+                            _("unknown metadata type"));
+            goto cleanup;
+            break;
+        }
+    }
+
+    if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
+        switch ((virDomainMetadataType) type) {
+        case VIR_DOMAIN_METADATA_DESCRIPTION:
+            VIR_FREE(persistentDef->description);
+            if (metadata &&
+                !(persistentDef->description = strdup(metadata)))
+                goto no_memory;
+            break;
+        case VIR_DOMAIN_METADATA_TITLE:
+            VIR_FREE(persistentDef->title);
+            if (metadata &&
+                !(persistentDef->title = strdup(metadata)))
+                goto no_memory;
+            break;
+        case VIR_DOMAIN_METADATA_ELEMENT:
+            qemuReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
+                            _("QEMU driver does not support"
+                              "<metadata> element"));
+            goto cleanup;
+         default:
+            qemuReportError(VIR_ERR_INVALID_ARG, "%s",
+                            _("unknown metadata type"));
+            goto cleanup;
+            break;
+        }
+
+        if (virDomainSaveConfig(driver->configDir, persistentDef) < 0)
+            goto cleanup;
+    }
+
+    ret = 0;
+
+cleanup:
+    if (vm)
+        virDomainObjUnlock(vm);
+    return ret;
+no_memory:
+    virReportOOMError();
+    goto cleanup;
+}
+
+static char *
+qemuDomainGetMetadata(virDomainPtr dom,
+                      int type,
+                      const char *uri ATTRIBUTE_UNUSED,
+                      unsigned int flags)
+{
+    struct qemud_driver *driver = dom->conn->privateData;
+    virDomainObjPtr vm;
+    virDomainDefPtr def;
+    char *ret = NULL;
+    char *field = NULL;
+
+    virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
+                  VIR_DOMAIN_AFFECT_CONFIG, NULL);
+
+    qemuDriverLock(driver);
+    vm = virDomainFindByUUID(&driver->domains, dom->uuid);
+    qemuDriverUnlock(driver);
+
+    if (!vm) {
+        char uuidstr[VIR_UUID_STRING_BUFLEN];
+        virUUIDFormat(dom->uuid, uuidstr);
+        qemuReportError(VIR_ERR_NO_DOMAIN,
+                        _("no domain with matching uuid '%s'"), uuidstr);
+        goto cleanup;
+    }
+
+    if (virDomainLiveConfigHelperMethod(driver->caps, vm, &flags, &def) < 0)
+        goto cleanup;
+
+    /* use correct domain definition according to flags */
+    if (flags & VIR_DOMAIN_AFFECT_LIVE)
+        def = vm->def;
+
+    switch ((virDomainMetadataType) type) {
+    case VIR_DOMAIN_METADATA_DESCRIPTION:
+        field = def->description;
+        break;
+    case VIR_DOMAIN_METADATA_TITLE:
+        field = def->title;
+        break;
+    case VIR_DOMAIN_METADATA_ELEMENT:
+        qemuReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, "%s",
+                        _("QEMU driver does not support"
+                          "<metadata> element"));
+        goto cleanup;
+        break;
+    default:
+        qemuReportError(VIR_ERR_INVALID_ARG, "%s",
+                        _("unknown metadata type"));
+        goto cleanup;
+        break;
+    }
+
+    if (!field) {
+        qemuReportError(VIR_ERR_NO_DOMAIN_METADATA, "%s",
+                        _("Requested metadata element is not present"));
+        goto cleanup;
+    }
+
+    if (!(ret = strdup(field))) {
+        virReportOOMError();
+        goto cleanup;
+    }
+
+cleanup:
+    if (vm)
+        virDomainObjUnlock(vm);
+    return ret;
+}
+
 static virDriver qemuDriver = {
     .no = VIR_DRV_QEMU,
     .name = "QEMU",
@@ -11967,6 +12139,8 @@ static virDriver qemuDriver = {
     .domainGetInterfaceParameters = qemuDomainGetInterfaceParameters, /* 0.9.9 */
     .domainSetInterfaceParameters = qemuDomainSetInterfaceParameters, /* 0.9.9 */
     .domainGetDiskErrors = qemuDomainGetDiskErrors, /* 0.9.10 */
+    .domainSetMetadata = qemuDomainSetMetadata, /* 0.9.10 */
+    .domainGetMetadata = qemuDomainGetMetadata, /* 0.9.10 */
 };