Make ABI stability issue easier to debug

When ABI stability check fails, we only log the error message describing
the incompatibility. Let's log both XMLs in case of an error to make it
easier to analyze where and why the stability check failed.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

src/conf/domain_conf.c

@@ -13867,13 +13867,16 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
                               virDomainDefPtr dst)
 {
     size_t i;
+    virErrorPtr err;
+    char *strSrc;
+    char *strDst;
 
     if (src->virtType != dst->virtType) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain virt type %s does not match source %s"),
                        virDomainVirtTypeToString(dst->virtType),
                        virDomainVirtTypeToString(src->virtType));
-        return false;
+        goto error;
     }
 
     if (memcmp(src->uuid, dst->uuid, VIR_UUID_BUFLEN) != 0) {
@@ -13884,7 +13887,7 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain uuid %s does not match source %s"),
                        uuiddst, uuidsrc);
-        return false;
+        goto error;
     }
 
     /* Not strictly ABI related, but we want to make sure domains
@@ -13895,60 +13898,60 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain name '%s' does not match source '%s'"),
                        dst->name, src->name);
-        return false;
+        goto error;
     }
 
     if (src->mem.max_balloon != dst->mem.max_balloon) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain max memory %lld does not match source %lld"),
                        dst->mem.max_balloon, src->mem.max_balloon);
-        return false;
+        goto error;
     }
     if (src->mem.cur_balloon != dst->mem.cur_balloon) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain current memory %lld does not match source %lld"),
                        dst->mem.cur_balloon, src->mem.cur_balloon);
-        return false;
+        goto error;
     }
     if (src->mem.hugepage_backed != dst->mem.hugepage_backed) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain huge page backing %d does not match source %d"),
                        dst->mem.hugepage_backed,
                        src->mem.hugepage_backed);
-        return false;
+        goto error;
     }
 
     if (src->vcpus != dst->vcpus) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain vCPU count %d does not match source %d"),
                        dst->vcpus, src->vcpus);
-        return false;
+        goto error;
     }
     if (src->maxvcpus != dst->maxvcpus) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain vCPU max %d does not match source %d"),
                        dst->maxvcpus, src->maxvcpus);
-        return false;
+        goto error;
     }
 
     if (STRNEQ(src->os.type, dst->os.type)) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain OS type %s does not match source %s"),
                        dst->os.type, src->os.type);
-        return false;
+        goto error;
     }
     if (src->os.arch != dst->os.arch){
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain architecture %s does not match source %s"),
                        virArchToString(dst->os.arch),
                        virArchToString(src->os.arch));
-        return false;
+        goto error;
     }
     if (STRNEQ_NULLABLE(src->os.machine, dst->os.machine)) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain OS type %s does not match source %s"),
                        dst->os.machine, src->os.machine);
-        return false;
+        goto error;
     }
 
     if (src->os.smbios_mode != dst->os.smbios_mode) {
@@ -13956,203 +13959,203 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
                        _("Target domain SMBIOS mode %s does not match source %s"),
                        virDomainSmbiosModeTypeToString(dst->os.smbios_mode),
                        virDomainSmbiosModeTypeToString(src->os.smbios_mode));
-        return false;
+        goto error;
     }
 
     if (!virDomainDefFeaturesCheckABIStability(src, dst))
-        return false;
+        goto error;
 
     if (src->clock.ntimers != dst->clock.ntimers) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                        _("Target domain timers do not match source"));
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->clock.ntimers; i++) {
         if (!virDomainTimerDefCheckABIStability(src->clock.timers[i],
                                                 dst->clock.timers[i]))
-            return false;
+            goto error;
     }
 
     if (!virCPUDefIsEqual(src->cpu, dst->cpu))
-        return false;
+        goto error;
 
     if (!virSysinfoIsEqual(src->sysinfo, dst->sysinfo))
-        return false;
+        goto error;
 
     if (src->ndisks != dst->ndisks) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain disk count %zu does not match source %zu"),
                        dst->ndisks, src->ndisks);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->ndisks; i++)
         if (!virDomainDiskDefCheckABIStability(src->disks[i], dst->disks[i]))
-            return false;
+            goto error;
 
     if (src->ncontrollers != dst->ncontrollers) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain controller count %zu "
                          "does not match source %zu"),
                        dst->ncontrollers, src->ncontrollers);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->ncontrollers; i++)
         if (!virDomainControllerDefCheckABIStability(src->controllers[i],
                                                      dst->controllers[i]))
-            return false;
+            goto error;
 
     if (src->nfss != dst->nfss) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain filesystem count %zu "
                          "does not match source %zu"),
                        dst->nfss, src->nfss);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nfss; i++)
         if (!virDomainFsDefCheckABIStability(src->fss[i], dst->fss[i]))
-            return false;
+            goto error;
 
     if (src->nnets != dst->nnets) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain net card count %zu "
                          "does not match source %zu"),
                        dst->nnets, src->nnets);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nnets; i++)
         if (!virDomainNetDefCheckABIStability(src->nets[i], dst->nets[i]))
-            return false;
+            goto error;
 
     if (src->ninputs != dst->ninputs) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain input device count %zu "
                          "does not match source %zu"),
                        dst->ninputs, src->ninputs);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->ninputs; i++)
         if (!virDomainInputDefCheckABIStability(src->inputs[i], dst->inputs[i]))
-            return false;
+            goto error;
 
     if (src->nsounds != dst->nsounds) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain sound card count %zu "
                          "does not match source %zu"),
                        dst->nsounds, src->nsounds);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nsounds; i++)
         if (!virDomainSoundDefCheckABIStability(src->sounds[i], dst->sounds[i]))
-            return false;
+            goto error;
 
     if (src->nvideos != dst->nvideos) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain video card count %zu "
                          "does not match source %zu"),
                        dst->nvideos, src->nvideos);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nvideos; i++)
         if (!virDomainVideoDefCheckABIStability(src->videos[i], dst->videos[i]))
-            return false;
+            goto error;
 
     if (src->nhostdevs != dst->nhostdevs) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain host device count %zu "
                          "does not match source %zu"),
                        dst->nhostdevs, src->nhostdevs);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nhostdevs; i++)
         if (!virDomainHostdevDefCheckABIStability(src->hostdevs[i],
                                                   dst->hostdevs[i]))
-            return false;
+            goto error;
 
     if (src->nsmartcards != dst->nsmartcards) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain smartcard count %zu "
                          "does not match source %zu"),
                        dst->nsmartcards, src->nsmartcards);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nsmartcards; i++)
         if (!virDomainSmartcardDefCheckABIStability(src->smartcards[i],
                                                     dst->smartcards[i]))
-            return false;
+            goto error;
 
     if (src->nserials != dst->nserials) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain serial port count %zu "
                          "does not match source %zu"),
                        dst->nserials, src->nserials);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nserials; i++)
         if (!virDomainSerialDefCheckABIStability(src->serials[i],
                                                  dst->serials[i]))
-            return false;
+            goto error;
 
     if (src->nparallels != dst->nparallels) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain parallel port count %zu "
                          "does not match source %zu"),
                        dst->nparallels, src->nparallels);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nparallels; i++)
         if (!virDomainParallelDefCheckABIStability(src->parallels[i],
                                                    dst->parallels[i]))
-            return false;
+            goto error;
 
     if (src->nchannels != dst->nchannels) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain channel count %zu "
                          "does not match source %zu"),
                        dst->nchannels, src->nchannels);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nchannels; i++)
         if (!virDomainChannelDefCheckABIStability(src->channels[i],
                                                   dst->channels[i]))
-            return false;
+            goto error;
 
     if (src->nconsoles != dst->nconsoles) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain console count %zu "
                          "does not match source %zu"),
                        dst->nconsoles, src->nconsoles);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nconsoles; i++)
         if (!virDomainConsoleDefCheckABIStability(src->consoles[i],
                                                   dst->consoles[i]))
-            return false;
+            goto error;
 
     if (src->nhubs != dst->nhubs) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain hub device count %zu "
                          "does not match source %zu"),
                        dst->nhubs, src->nhubs);
-        return false;
+        goto error;
     }
 
     for (i = 0; i < src->nhubs; i++)
         if (!virDomainHubDefCheckABIStability(src->hubs[i], dst->hubs[i]))
-            return false;
+            goto error;
 
     if ((!src->redirfilter && dst->redirfilter) ||
         (src->redirfilter && !dst->redirfilter)) {
@@ -14160,13 +14163,13 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
                        _("Target domain USB redirection filter count %d "
                          "does not match source %d"),
                        dst->redirfilter ? 1 : 0, src->redirfilter ? 1 : 0);
-        return false;
+        goto error;
     }
 
     if (src->redirfilter &&
         !virDomainRedirFilterDefCheckABIStability(src->redirfilter,
                                                   dst->redirfilter))
-        return false;
+        goto error;
 
     if ((!src->watchdog && dst->watchdog) ||
         (src->watchdog && !dst->watchdog)) {
@@ -14174,12 +14177,12 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
                        _("Target domain watchdog count %d "
                          "does not match source %d"),
                        dst->watchdog ? 1 : 0, src->watchdog ? 1 : 0);
-        return false;
+        goto error;
     }
 
     if (src->watchdog &&
         !virDomainWatchdogDefCheckABIStability(src->watchdog, dst->watchdog))
-        return false;
+        goto error;
 
     if ((!src->memballoon && dst->memballoon) ||
         (src->memballoon && !dst->memballoon)) {
@@ -14187,21 +14190,37 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
                        _("Target domain memory balloon count %d "
                          "does not match source %d"),
                        dst->memballoon ? 1 : 0, src->memballoon ? 1 : 0);
-        return false;
+        goto error;
     }
 
     if (src->memballoon &&
         !virDomainMemballoonDefCheckABIStability(src->memballoon,
                                                  dst->memballoon))
-        return false;
+        goto error;
 
     if (!virDomainRNGDefCheckABIStability(src->rng, dst->rng))
-        return false;
+        goto error;
 
     if (!virDomainPanicCheckABIStability(src->panic, dst->panic))
-        return false;
+        goto error;
 
     return true;
+
+error:
+    err = virSaveLastError();
+
+    strSrc = virDomainDefFormat(src, 0);
+    strDst = virDomainDefFormat(dst, 0);
+    VIR_DEBUG("XMLs that failed stability check were: src=\"%s\", dst=\"%s\"",
+              NULLSTR(strSrc), NULLSTR(strDst));
+    VIR_FREE(strSrc);
+    VIR_FREE(strDst);
+
+    if (err) {
+        virSetError(err);
+        virFreeError(err);
+    }
+    return false;
 }