commands: only set ringbuffer datalen when needed

If we do it unconditionally a request to only clear the ringbuffer and not read or write anything will fail. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

commands: only set ringbuffer datalen when needed
5928191e · Christian Brauner · d91adfa6 · 5928191e
Unverified Commit 5928191e authored Nov 15, 2017 by Christian Brauner
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commands.c src/lxc/commands.c +3 -1

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--- a/src/lxc/commands.c
+++ b/src/lxc/commands.c
@@ -1037,7 +1037,9 @@ static int lxc_cmd_console_log_callback(int fd, struct lxc_cmd_req *req,
 	if (buffer_size <= 0)
 		goto out;
-	rsp.datalen = lxc_ringbuf_used(buf);
+	if (log->read || log->write_logfile)
+		rsp.datalen = lxc_ringbuf_used(buf);
 	if (log->read)
 		rsp.data = lxc_ringbuf_get_read_addr(buf);