snapshot: Define explicit flags for snapshot xml

Commit f609cb85 (0.9.5) introduced virDomainSnapshotGetXMLDesc()'s use
of @flags as a subset of virDomainXMLFlags, documenting that 2 of the
3 flags defined at the time would never be valid.  Later, commit
28f8dfdc (1.0.0) introduced a new flag, VIR_DOMAIN_XML_MIGRATABLE, but
did not adjust the snapshot documentation to declare it as invalid.
However, since the flag is not accepted as valid by any of the
drivers (remote is just passthrough; esx and vbox don't support flags;
qemu, test, and vz only support VIR_DOMAIN_XML_SECURE), and it is
unlikely that the domain state saved off during a snapshot creation
needs to be migration-friendly (as the snapshot is not the source of
a migration), it is easier to just define an explicit set of supported
flags directly related to the snapshot API rather than trying to
borrow from domain API, and risking confusion if even more domain
flags are added later (in fact, I have an upcoming patch that plans to
add a new flag to virDomainGetXMLDesc that makes no sense for
snapshots).

There is no API or ABI impact (since we purposefully used unsigned int
rather than an enum type in public API, and since the new flag name
carries the same value as the reused name).

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>

include/libvirt/libvirt-domain-snapshot.h

@@ -78,6 +78,10 @@ virDomainSnapshotPtr virDomainSnapshotCreateXML(virDomainPtr domain,
                                                 const char *xmlDesc,
                                                 unsigned int flags);
 
+typedef enum {
+    VIR_DOMAIN_SNAPSHOT_XML_SECURE         = VIR_DOMAIN_XML_SECURE, /* dump security sensitive information too */
+} virDomainSnapshotXMLFlags;
+
 /* Dump the XML of a snapshot */
 char *virDomainSnapshotGetXMLDesc(virDomainSnapshotPtr snapshot,
                                   unsigned int flags);

src/libvirt-domain-snapshot.c

@@ -244,14 +244,13 @@ virDomainSnapshotCreateXML(virDomainPtr domain,
 /**
  * virDomainSnapshotGetXMLDesc:
  * @snapshot: a domain snapshot object
- * @flags: bitwise-OR of subset of virDomainXMLFlags
+ * @flags: bitwise-OR of supported virDomainSnapshotXMLFlags
  *
  * Provide an XML description of the domain snapshot.
  *
  * No security-sensitive data will be included unless @flags contains
- * VIR_DOMAIN_XML_SECURE; this flag is rejected on read-only
+ * VIR_DOMAIN_SNAPSHOT_XML_SECURE; this flag is rejected on read-only
- * connections.  For this API, @flags should not contain either
+ * connections.
- * VIR_DOMAIN_XML_INACTIVE or VIR_DOMAIN_XML_UPDATE_CPU.
  *
  * Returns a 0 terminated UTF-8 encoded XML instance, or NULL in case of error.
  *         the caller must free() the returned value.
@@ -268,7 +267,8 @@ virDomainSnapshotGetXMLDesc(virDomainSnapshotPtr snapshot,
     virCheckDomainSnapshotReturn(snapshot, NULL);
     conn = snapshot->domain->conn;
 
-    if ((conn->flags & VIR_CONNECT_RO) && (flags & VIR_DOMAIN_XML_SECURE)) {
+    if ((conn->flags & VIR_CONNECT_RO) &&
+        (flags & VIR_DOMAIN_SNAPSHOT_XML_SECURE)) {
         virReportError(VIR_ERR_OPERATION_DENIED, "%s",
                        _("virDomainSnapshotGetXMLDesc with secure flag"));
         goto error;

src/qemu/qemu_driver.c

@@ -16247,7 +16247,7 @@ qemuDomainSnapshotGetXMLDesc(virDomainSnapshotPtr snapshot,
     virDomainSnapshotObjPtr snap = NULL;
     char uuidstr[VIR_UUID_STRING_BUFLEN];
 
-    virCheckFlags(VIR_DOMAIN_XML_SECURE, NULL);
+    virCheckFlags(VIR_DOMAIN_SNAPSHOT_XML_SECURE, NULL);
 
     if (!(vm = qemuDomObjFromSnapshot(snapshot)))
         return NULL;

src/remote/remote_protocol.x

@@ -4902,7 +4902,7 @@ enum remote_procedure {
      * @generate: both
      * @priority: high
      * @acl: domain:read
-     * @acl: domain:read_secure:VIR_DOMAIN_XML_SECURE
+     * @acl: domain:read_secure:VIR_DOMAIN_SNAPSHOT_XML_SECURE
      */
     REMOTE_PROC_DOMAIN_SNAPSHOT_GET_XML_DESC = 186,
 

src/test/test_driver.c

@@ -6197,7 +6197,7 @@ testDomainSnapshotGetXMLDesc(virDomainSnapshotPtr snapshot,
     char uuidstr[VIR_UUID_STRING_BUFLEN];
     testDriverPtr privconn = snapshot->domain->conn->privateData;
 
-    virCheckFlags(VIR_DOMAIN_XML_SECURE, NULL);
+    virCheckFlags(VIR_DOMAIN_SNAPSHOT_XML_SECURE, NULL);
 
     if (!(vm = testDomObjFromSnapshot(snapshot)))
         return NULL;

src/vz/vz_driver.c

@@ -2273,7 +2273,7 @@ vzDomainSnapshotGetXMLDesc(virDomainSnapshotPtr snapshot, unsigned int flags)
     virDomainSnapshotObjListPtr snapshots = NULL;
     vzConnPtr privconn = snapshot->domain->conn->privateData;
 
-    virCheckFlags(VIR_DOMAIN_XML_SECURE, NULL);
+    virCheckFlags(VIR_DOMAIN_SNAPSHOT_XML_SECURE, NULL);
 
     if (!(dom = vzDomObjFromDomain(snapshot->domain)))
         return NULL;