Allow `consul lock` to create cross-DC sessions

Signed-off-by: Johannes Löthberg <johannes.loethberg@elokon.com>

api/lock.go

@@ -355,9 +355,11 @@ func (l *Lock) createSession() (string, error) {
 	se := l.opts.SessionOpts
 	if se == nil {
 		se = &SessionEntry{
-			Name:      l.opts.SessionName,
-			TTL:       l.opts.SessionTTL,
-			LockDelay: l.opts.LockDelay,
+			Name:       l.opts.SessionName,
+			TTL:        l.opts.SessionTTL,
+			LockDelay:  l.opts.LockDelay,
+			Node:       "",
+			NodeChecks: []string{},
 		}
 	}
 	w := WriteOptions{Namespace: l.opts.Namespace}

api/session.go

@@ -102,7 +102,7 @@ func (s *Session) Create(se *SessionEntry, q *WriteOptions) (string, *WriteMeta,
 		if len(se.Checks) > 0 {
 			body["Checks"] = se.Checks
 		}
-		if len(se.NodeChecks) > 0 {
+		if se.NodeChecks != nil {
 			body["NodeChecks"] = se.NodeChecks
 		}
 		if len(se.ServiceChecks) > 0 {