ctdb-tests: Validate that TAKE_IP works with IP already on an interface

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>

Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Thu Aug 18 02:50:16 CEST 2016 on sn-devel-144

ctdb/tests/complex/61_rogueip_takeip.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+test_info()
+{
+    cat <<EOF
+Verify that TAKE_IP will work for an IP that is already on an interface
+
+This is a variation of simple/60_recoverd_missing_ip.sh
+EOF
+}
+
+. "${TEST_SCRIPTS_DIR}/integration.bash"
+
+ctdb_test_init "$@"
+
+set -e
+
+cluster_is_healthy
+
+# Reset configuration
+ctdb_restart_when_done
+
+select_test_node_and_ips
+
+echo "Running test against node $test_node and IP $test_ip"
+
+get_test_ip_mask_and_iface
+
+echo "Deleting IP $test_ip from all nodes"
+delete_ip_from_all_nodes $test_ip
+try_command_on_node -v $test_node $CTDB ipreallocate
+wait_until_ips_are_on_node ! $test_node $test_ip
+
+try_command_on_node -v all $CTDB ip
+
+# The window here needs to small, to try to avoid the address being
+# released.  The test will still pass either way but if the first IP
+# takeover run does a release then this doesn't test the code path we
+# expect it to...
+echo "Adding IP $test_ip to $iface and CTDB on node $test_node"
+ip_cmd="ip addr add $test_ip/$mask dev $iface"
+ctdb_cmd="$CTDB addip $test_ip/$mask $iface && $CTDB ipreallocate"
+try_command_on_node $test_node "$ip_cmd && $ctdb_cmd"
+
+wait_until_ips_are_on_node $test_node $test_ip