[libvirt] [RFC: PATCHv3 3/3] save: generate idempotent inactive xml for running domain

[Eric Blake]

Noticed by comparing the xml generated by virDomainSave with the
xml produced by reparsing and redumping that xml.

* src/conf/domain_conf.c (virDomainDeviceInfoIsSet): Add
parameter, and update all callers.  Make static.
(virDomainNetDefFormat): Skip generated ifname.
* src/conf/domain_conf.h (virDomainDeviceInfoIsSet): Delete.
* src/libvirt_private.syms (domain_conf.h): Update.
---

Sending this now, to get review started, but I still have some
more fixing to do - right now, active domains still include:

+  <seclabel type='dynamic' model='selinux' relabel='yes'/>

which is not present on reparse, but I'm too tired to find out why.

 src/conf/domain_conf.c   |   26 ++++++++++++++++----------
 src/conf/domain_conf.h   |    1 -
 src/libvirt_private.syms |    1 -
 3 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 919a75a..52e8ada 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -1388,11 +1388,12 @@ int virDomainDeviceVirtioSerialAddressIsValid(
 }


-int virDomainDeviceInfoIsSet(virDomainDeviceInfoPtr info)
+static int
+virDomainDeviceInfoIsSet(virDomainDeviceInfoPtr info, unsigned int flags)
 {
     if (info->type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE)
         return 1;
-    if (info->alias)
+    if (info->alias && !(flags & VIR_DOMAIN_XML_INACTIVE))
         return 1;
     return 0;
 }
@@ -8580,7 +8581,7 @@ virDomainControllerDefFormat(virBufferPtr buf,
         break;
     }

-    if (virDomainDeviceInfoIsSet(&def->info)) {
+    if (virDomainDeviceInfoIsSet(&def->info, flags)) {
         virBufferAddLit(buf, ">\n");
         if (virDomainDeviceInfoFormat(buf, &def->info, flags) < 0)
             return -1;
@@ -8806,9 +8807,14 @@ virDomainNetDefFormat(virBufferPtr buf,
         break;
     }

-    if (def->ifname)
+
+    if (def->ifname &&
+        !((flags & VIR_DOMAIN_XML_INACTIVE) &&
+          (STRPREFIX(def->ifname, "vnet")))) {
+        /* Skip auto-generated target names for inactive config. */
         virBufferEscapeString(buf, "      <target dev='%s'/>\n",
                               def->ifname);
+    }
     if (def->model) {
         virBufferEscapeString(buf, "      <model type='%s'/>\n",
                               def->model);
@@ -9041,7 +9047,7 @@ virDomainChrDefFormat(virBufferPtr buf,
         break;
     }

-    if (virDomainDeviceInfoIsSet(&def->info)) {
+    if (virDomainDeviceInfoIsSet(&def->info, flags)) {
         if (virDomainDeviceInfoFormat(buf, &def->info, flags) < 0)
             return -1;
     }
@@ -9069,7 +9075,7 @@ virDomainSmartcardDefFormat(virBufferPtr buf,
     virBufferAsprintf(buf, "    <smartcard mode='%s'", mode);
     switch (def->type) {
     case VIR_DOMAIN_SMARTCARD_TYPE_HOST:
-        if (!virDomainDeviceInfoIsSet(&def->info)) {
+        if (!virDomainDeviceInfoIsSet(&def->info, flags)) {
             virBufferAddLit(buf, "/>\n");
             return 0;
         }
@@ -9119,7 +9125,7 @@ virDomainSoundDefFormat(virBufferPtr buf,
     virBufferAsprintf(buf, "    <sound model='%s'",
                       model);

-    if (virDomainDeviceInfoIsSet(&def->info)) {
+    if (virDomainDeviceInfoIsSet(&def->info, flags)) {
         virBufferAddLit(buf, ">\n");
         if (virDomainDeviceInfoFormat(buf, &def->info, flags) < 0)
             return -1;
@@ -9148,7 +9154,7 @@ virDomainMemballoonDefFormat(virBufferPtr buf,
     virBufferAsprintf(buf, "    <memballoon model='%s'",
                       model);

-    if (virDomainDeviceInfoIsSet(&def->info)) {
+    if (virDomainDeviceInfoIsSet(&def->info, flags)) {
         virBufferAddLit(buf, ">\n");
         if (virDomainDeviceInfoFormat(buf, &def->info, flags) < 0)
             return -1;
@@ -9197,7 +9203,7 @@ virDomainWatchdogDefFormat(virBufferPtr buf,
     virBufferAsprintf(buf, "    <watchdog model='%s' action='%s'",
                       model, action);

-    if (virDomainDeviceInfoIsSet(&def->info)) {
+    if (virDomainDeviceInfoIsSet(&def->info, flags)) {
         virBufferAddLit(buf, ">\n");
         if (virDomainDeviceInfoFormat(buf, &def->info, flags) < 0)
             return -1;
@@ -9280,7 +9286,7 @@ virDomainInputDefFormat(virBufferPtr buf,
     virBufferAsprintf(buf, "    <input type='%s' bus='%s'",
                       type, bus);

-    if (virDomainDeviceInfoIsSet(&def->info)) {
+    if (virDomainDeviceInfoIsSet(&def->info, flags)) {
         virBufferAddLit(buf, ">\n");
         if (virDomainDeviceInfoFormat(buf, &def->info, flags) < 0)
             return -1;
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 551946b..b97a57a 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1388,7 +1388,6 @@ int virDomainDeviceAddressIsValid(virDomainDeviceInfoPtr info,
 int virDomainDevicePCIAddressIsValid(virDomainDevicePCIAddressPtr addr);
 int virDomainDeviceDriveAddressIsValid(virDomainDeviceDriveAddressPtr addr);
 int virDomainDeviceVirtioSerialAddressIsValid(virDomainDeviceVirtioSerialAddressPtr addr);
-int virDomainDeviceInfoIsSet(virDomainDeviceInfoPtr info);
 void virDomainDeviceInfoClear(virDomainDeviceInfoPtr info);
 void virDomainDefClearPCIAddresses(virDomainDefPtr def);
 void virDomainDefClearDeviceAliases(virDomainDefPtr def);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index e7d2579..3996efa 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -267,7 +267,6 @@ virDomainDeviceAddressIsValid;
 virDomainDeviceAddressTypeToString;
 virDomainDeviceDefFree;
 virDomainDeviceDefParse;
-virDomainDeviceInfoIsSet;
 virDomainDeviceInfoIterate;
 virDomainDevicePCIAddressIsValid;
 virDomainDeviceTypeToString;
-- 
1.7.4.4