[spice-gtk] smartcard: Warn if multiple readers are detected

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

spice-server does not deal properly with multiple smartcard readers,
only the first one will be working. Add a warning when this happens to
make it easier to diagnose such issues.

Signed-off-by: Christophe Fergeau <cfergeau@xxxxxxxxxx>
---
 src/smartcard-manager.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/smartcard-manager.c b/src/smartcard-manager.c
index ceecfdc7..456c3c2e 100644
--- a/src/smartcard-manager.c
+++ b/src/smartcard-manager.c
@@ -389,6 +389,25 @@ typedef struct {
     GError *err;
 } SmartcardManagerInitArgs;
 
+/* spice-server only supports one smartcard reader being in use */
+static void smartcard_check_reader_count(void)
+{
+    unsigned int reader_count = 0;
+    GList *readers;
+    GList *it;
+
+    readers = spice_smartcard_manager_get_readers(spice_smartcard_manager_get());
+
+    for (it = readers; it != NULL; it = it->next) {
+        reader_count++;
+        g_boxed_free(SPICE_TYPE_SMARTCARD_READER, it->data);
+    }
+    if (reader_count > 1) {
+        g_warning("Multiple smartcard readers are plugged in, only the first one will be shared with the VM");
+    }
+    g_list_free(readers);
+}
+
 static gboolean smartcard_manager_init(SmartcardManagerInitArgs *args)
 {
     gchar *emul_args = NULL;
@@ -442,6 +461,7 @@ init:
                                 "Failed to initialize smartcard");
         goto end;
     }
+    smartcard_check_reader_count();
 
     retval = TRUE;
 
-- 
2.20.1

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