[spice-gtk v1] file-xfer: do not send unnecessary 0 bytes messages

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From: Victor Toso <me@xxxxxxxxxxxxxx>

This fixes the situation when VDAgent receives 0 byte message
regarding a file-transfer operation that was terminated in the
previous message.

This makes the VDAgent to send a STATUS_ERROR after STATUS_SUCCESS to
client.

Resolves: https://bugs.freedesktop.org/show_bug.cgi?id=97227

Signed-off-by: Victor Toso <victortoso@xxxxxxxxxx>
---
 src/channel-main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/channel-main.c b/src/channel-main.c
index 990a06a..72ca712 100644
--- a/src/channel-main.c
+++ b/src/channel-main.c
@@ -1822,6 +1822,14 @@ static void file_xfer_read_async_cb(GObject *source_object,
         return;
     }
 
+    if (count == 0 && spice_file_transfer_task_get_total_bytes(xfer_task) > 0) {
+        /* If we have sent all payload to the agent, we should not send 0 bytes
+         * as it will cause https://bugs.freedesktop.org/show_bug.cgi?id=97227.
+         * Only when file has 0 bytes of size is when we should send 0 bytes to
+         * agent, see: https://bugzilla.redhat.com/show_bug.cgi?id=1135099 */
+        return;
+    }
+
     file_xfer_queue_msg_to_agent(channel, spice_file_transfer_task_get_id(xfer_task), buffer, count);
     if (count == 0 || spice_file_transfer_task_is_completed(xfer_task)) {
         /* on EOF just wait for VD_AGENT_FILE_XFER_STATUS from agent
-- 
2.9.3

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