[libvirt] [PATCH] qemu: Error prompt if invalid dump image format specified

[Osier Yang]

"getCompressionType" trys to throw error when invalid dump image
format is specified, or the compression program for the specified
image format is not available, but at the same time, it returns
enum qemud_save_formats, as a result, upper function will think
it was successful, and disgard to check the error, this fix makes
changes so that it returns -1 on FAILURE, And to be consistent with
"save", won't use "raw" as the default dump format anymore.

* src/qemu/qemu_driver.c
  - rename "getCompressionType" to "getDumpType"
  - return -1 on FAILURE

---
 src/qemu/qemu_driver.c |   40 +++++++++++++++++++++++++---------------
 1 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 395f72f..f8c2aae 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -4787,8 +4787,12 @@ cleanup:
     return ret;
 }

-static enum qemud_save_formats
-getCompressionType(struct qemud_driver *driver)
+/* Returns enum qemud_save_formats on SUCCESS, or returns -1 if
+ * specified dump image format is invalid or compression program
+ * for the format specified is not available on FAILURE.
+ */
+static int
+getDumpType(struct qemud_driver *driver)
 {
     int compress = QEMUD_SAVE_FORMAT_RAW;

@@ -4801,15 +4805,14 @@ getCompressionType(struct qemud_driver *driver)
         if (compress < 0) {
             qemuReportError(VIR_ERR_OPERATION_FAILED, "%s",
                             _("Invalid dump image format specified in "
-                              "configuration file, using raw"));
-            return QEMUD_SAVE_FORMAT_RAW;
+                              "configuration file."));
+            return -1;
         }
         if (!qemudCompressProgramAvailable(compress)) {
             qemuReportError(VIR_ERR_OPERATION_FAILED,
                             "%s", _("Compression program for dump image format "
-                                    "in configuration file isn't available, "
-                                    "using raw"));
-            return QEMUD_SAVE_FORMAT_RAW;
+                                    "in configuration file isn't available."));
+            return -1;
         }
     }
     return compress;
@@ -4865,7 +4868,11 @@ static int qemudDomainCoreDump(virDomainPtr dom,
         }
     }

-    ret = doCoreDump(driver, vm, path, getCompressionType(driver));
+    int compress = getDumpType(driver);
+    if (compress < 0)
+        goto endjob;
+
+    ret = doCoreDump(driver, vm, path, compress);
     if (ret < 0)
         goto endjob;

@@ -4937,13 +4944,16 @@ static void processWatchdogEvent(void *data, void *opaque)
                 break;
             }

-            ret = doCoreDump(driver,
-                             wdEvent->vm,
-                             dumpfile,
-                             getCompressionType(driver));
-            if (ret < 0)
-                qemuReportError(VIR_ERR_OPERATION_FAILED,
-                                "%s", _("Dump failed"));
+            int compress = getDumpType(driver);
+            if (compress >= 0) {
+                ret = doCoreDump(driver,
+                                 wdEvent->vm,
+                                 dumpfile,
+                                 compress);
+                if (ret < 0)
+                    qemuReportError(VIR_ERR_OPERATION_FAILED,
+                                    "%s", _("Dump failed"));
+            }

             ret = doStartCPUs(driver, wdEvent->vm, NULL);

--
1.7.3.2