[spice-server] tests: Automatically determine free port to use

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

Currently, the port used by most tests is hardcoded to 5912. However,
the test suite can be run in parallel, so if 2 tests run in parallel,
the 2nd one is not going to be able to bind to port 5912 and will fail.

After this commit, test_new() will try to find a free port between 5912
and 5922 and will abort if it can't find any.

The issue can be reproduced by adding a usleep(1000000) to the beginning
of test_destroy().

Signed-off-by: Christophe Fergeau <cfergeau@xxxxxxxxxx>
---
 server/tests/test-display-base.c | 48 ++++++++++++++++++++++++++++++++--------
 server/tests/test-display-base.h |  1 -
 server/tests/test-two-servers.c  |  2 +-
 3 files changed, 40 insertions(+), 11 deletions(-)

diff --git a/server/tests/test-display-base.c b/server/tests/test-display-base.c
index 289aa9840..76c3de744 100644
--- a/server/tests/test-display-base.c
+++ b/server/tests/test-display-base.c
@@ -32,6 +32,7 @@
 #include <spice/qxl_dev.h>
 
 #include "test-display-base.h"
+#include "test-glib-compat.h"
 #include "red-channel.h"
 
 #ifndef PATH_MAX
@@ -899,11 +900,30 @@ void test_set_command_list(Test *test, Command *commands, int num_commands)
     test->num_commands = num_commands;
 }
 
+static gboolean ignore_bind_failures(const gchar *log_domain,
+                                     GLogLevelFlags log_level,
+                                     const gchar *message,
+                                     gpointer user_data)
+{
+    if (!g_str_equal (log_domain, G_LOG_DOMAIN)) {
+        return true;
+    }
+    if ((log_level & G_LOG_LEVEL_WARNING) == 0)  {
+        return true;
+    }
+    if (strstr(message, "reds_init_socket: binding socket to ") == NULL) {
+        g_print("XXX [%s]\n", message);
+        return true;
+    }
 
-Test* test_new_with_port(SpiceCoreInterface* core, int port)
+    return false;
+}
+
+Test* test_new(SpiceCoreInterface* core)
 {
     Test *test = spice_new0(Test, 1);
     SpiceServer* server = spice_server_new();
+    int port = -1;
 
     test->qxl_instance.base.sif = &display_sif.base;
     test->qxl_instance.id = 0;
@@ -913,10 +933,25 @@ Test* test_new_with_port(SpiceCoreInterface* core, int port)
     test->wakeup_ms = 1;
     test->cursor_notify = NOTIFY_CURSOR_BATCH;
     // some common initialization for all display tests
-    printf("TESTER: listening on port %d (unsecure)\n", port);
-    spice_server_set_port(server, port);
+#define BASE_PORT 5912
+    port = BASE_PORT;
     spice_server_set_noauth(server);
-    spice_server_init(server, core);
+
+    g_test_log_set_fatal_handler(ignore_bind_failures, NULL);
+    while (port < BASE_PORT + 10) {
+        spice_server_set_port(server, port);
+        if (spice_server_init(server, core) == 0) {
+            break;
+        }
+        port++;
+    }
+
+    if (port >= BASE_PORT + 10) {
+        g_assert_not_reached();
+        return NULL;
+    }
+
+    printf("TESTER: listening on port %d (unsecure)\n", port);
 
     cursor_init();
     path_init(&path, 0, angle_parts);
@@ -925,11 +960,6 @@ Test* test_new_with_port(SpiceCoreInterface* core, int port)
     return test;
 }
 
-Test *test_new(SpiceCoreInterface *core)
-{
-    return test_new_with_port(core, 5912);
-}
-
 void test_destroy(Test *test)
 {
     spice_server_destroy(test->server);
diff --git a/server/tests/test-display-base.h b/server/tests/test-display-base.h
index a80f03e78..1a4f20c5b 100644
--- a/server/tests/test-display-base.h
+++ b/server/tests/test-display-base.h
@@ -134,7 +134,6 @@ void test_set_simple_command_list(Test *test, const int *command, int num_comman
 void test_set_command_list(Test *test, Command *command, int num_commands);
 void test_add_display_interface(Test *test);
 void test_add_agent_interface(SpiceServer *server); // TODO - Test *test
-Test* test_new_with_port(SpiceCoreInterface* core, int port);
 Test* test_new(SpiceCoreInterface* core);
 void test_destroy(Test *test);
 
diff --git a/server/tests/test-two-servers.c b/server/tests/test-two-servers.c
index 92935528e..40a0e5717 100644
--- a/server/tests/test-two-servers.c
+++ b/server/tests/test-two-servers.c
@@ -42,7 +42,7 @@ int main(void)
 
     core = basic_event_loop_init();
     t1 = test_new(core);
-    t2 = test_new_with_port(core, 5913);
+    t2 = test_new(core);
     //spice_server_set_image_compression(server, SPICE_IMAGE_COMPRESSION_OFF);
     test_add_display_interface(t1);
     test_add_display_interface(t2);
-- 
2.13.5

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