[PATCH v3] virsh: Don't break loop of domblkinfo for disks

[Han Han <hhan@xxxxxxxxxx>]

Fix logical error in v2: https://www.redhat.com/archives/libvir-list/2018-August/msg01358.html

https://bugzilla.redhat.com/show_bug.cgi?id=1619625

--all option is added to cmdDomblkinfo since commit 62c39193 allowing to
show all block devices info. Reset error when empty source in case error
breaks the loop of domblkinfo for disks.

Signed-off-by: Han Han <hhan@xxxxxxxxxx>
---
 tools/virsh-domain-monitor.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/tools/virsh-domain-monitor.c b/tools/virsh-domain-monitor.c
index b9b4f9739b..ecb98d4128 100644
--- a/tools/virsh-domain-monitor.c
+++ b/tools/virsh-domain-monitor.c
@@ -475,6 +475,7 @@ cmdDomblkinfo(vshControl *ctl, const vshCmd *cmd)
     int ndisks;
     size_t i;
     xmlNodePtr *disks = NULL;
+    char *source = NULL;
     char *target = NULL;
     char *protocol = NULL;
 
@@ -505,18 +506,20 @@ cmdDomblkinfo(vshControl *ctl, const vshCmd *cmd)
 
         for (i = 0; i < ndisks; i++) {
             ctxt->node = disks[i];
+            source = virXPathString("string(./source)", ctxt);
             protocol = virXPathString("string(./source/@protocol)", ctxt);
             target = virXPathString("string(./target/@dev)", ctxt);
 
             rc = virDomainGetBlockInfo(dom, target, &info, 0);
 
             if (rc < 0) {
-                /* If protocol is present that's an indication of a networked
-                 * storage device which cannot provide statistics, so generate
-                 * 0 based data and get the next disk. */
-                if (protocol && !active &&
+                /* For the case of empty cdrom, networked disk which cannot
+                 * provide statistics, generate 0 based data and get the next
+                 * disk.
+                 */
+                if (!source || (protocol && !active &&
                     virGetLastErrorCode() == VIR_ERR_INTERNAL_ERROR &&
-                    virGetLastErrorDomain() == VIR_FROM_STORAGE) {
+                    virGetLastErrorDomain() == VIR_FROM_STORAGE)) {
                     memset(&info, 0, sizeof(info));
                     vshResetLibvirtError();
                 } else {
@@ -526,6 +529,7 @@ cmdDomblkinfo(vshControl *ctl, const vshCmd *cmd)
 
             cmdDomblkinfoPrint(ctl, &info, target, human, false);
 
+            VIR_FREE(source);
             VIR_FREE(target);
             VIR_FREE(protocol);
         }
@@ -540,6 +544,7 @@ cmdDomblkinfo(vshControl *ctl, const vshCmd *cmd)
 
  cleanup:
     virshDomainFree(dom);
+    VIR_FREE(source);
     VIR_FREE(target);
     VIR_FREE(protocol);
     VIR_FREE(disks);
-- 
2.18.0

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