[PATCH v2 10/18] tests: switch migration FD passing test to use common precopy helper

["Daniel P. Berrangé" <berrange@redhat.com>]

The combination of the start and finish hooks allow the FD passing
code to use the precopy helper

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 tests/qtest/migration-test.c | 57 +++++++++++++-----------------------
 1 file changed, 21 insertions(+), 36 deletions(-)

diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index ae40429798..04f749aaa1 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -1002,31 +1002,12 @@ static void test_precopy_tcp(void)
     test_precopy_common(&args);
 }
 
-static void test_migrate_fd_proto(void)
+static void *test_migrate_fd_start_hook(QTestState *from,
+                                        QTestState *to)
 {
-    MigrateStart args = {};
-    QTestState *from, *to;
+    QDict *rsp;
     int ret;
     int pair[2];
-    QDict *rsp;
-    const char *error_desc;
-
-    if (test_migrate_start(&from, &to, "defer", &args)) {
-        return;
-    }
-
-    /*
-     * We want to pick a speed slow enough that the test completes
-     * quickly, but that it doesn't complete precopy even on a slow
-     * machine, so also set the downtime.
-     */
-    /* 1 ms should make it not converge */
-    migrate_set_parameter_int(from, "downtime-limit", 1);
-    /* 1GB/s */
-    migrate_set_parameter_int(from, "max-bandwidth", 1000000000);
-
-    /* Wait for the first serial output from the source */
-    wait_for_serial("src_serial");
 
     /* Create two connected sockets for migration */
     ret = socketpair(PF_LOCAL, SOCK_STREAM, 0, pair);
@@ -1051,17 +1032,15 @@ static void test_migrate_fd_proto(void)
     qobject_unref(rsp);
     close(pair[1]);
 
-    /* Start migration to the 2nd socket*/
-    migrate_qmp(from, "fd:fd-mig", "{}");
-
-    wait_for_migration_pass(from);
-
-    migrate_set_parameter_int(from, "downtime-limit", CONVERGE_DOWNTIME);
+    return NULL;
+}
 
-    if (!got_stop) {
-        qtest_qmp_eventwait(from, "STOP");
-    }
-    qtest_qmp_eventwait(to, "RESUME");
+static void test_migrate_fd_finish_hook(QTestState *from,
+                                        QTestState *to,
+                                        void *opaque)
+{
+    QDict *rsp;
+    const char *error_desc;
 
     /* Test closing fds */
     /* We assume, that QEMU removes named fd from its list,
@@ -1079,11 +1058,17 @@ static void test_migrate_fd_proto(void)
     error_desc = qdict_get_str(qdict_get_qdict(rsp, "error"), "desc");
     g_assert_cmpstr(error_desc, ==, "File descriptor named 'fd-mig' not found");
     qobject_unref(rsp);
+}
 
-    /* Complete migration */
-    wait_for_serial("dest_serial");
-    wait_for_migration_complete(from);
-    test_migrate_end(from, to, true);
+static void test_migrate_fd_proto(void)
+{
+    MigrateCommon args = {
+        .listen_uri = "defer",
+        .connect_uri = "fd:fd-mig",
+        .start_hook = test_migrate_fd_start_hook,
+        .finish_hook = test_migrate_fd_finish_hook
+    };
+    test_precopy_common(&args);
 }
 
 static void do_test_validate_uuid(MigrateStart *args, bool should_fail)
-- 
2.34.1