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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package harness
import (
"context"
"fmt"
"net"
"gvisor.dev/gvisor/pkg/test/dockerutil"
"gvisor.dev/gvisor/pkg/test/testutil"
)
// WaitUntilServing grabs a container from `machine` and waits for a server at
// IP:port.
func WaitUntilServing(ctx context.Context, machine Machine, server net.IP, port int) error {
var logger testutil.DefaultLogger = "netcat"
netcat := machine.GetNativeContainer(ctx, logger)
defer netcat.CleanUp(ctx)
cmd := fmt.Sprintf("while ! nc -zv %s %d; do true; done", server, port)
_, err := netcat.Run(ctx, dockerutil.RunOpts{
Image: "packetdrill",
}, "sh", "-c", cmd)
return err
}
// DropCaches drops caches on the provided machine. Requires root.
func DropCaches(machine Machine) error {
if out, err := machine.RunCommand("/bin/sh", "-c", "sync | sysctl vm.drop_caches=3"); err != nil {
return fmt.Errorf("failed to drop caches: %v logs: %s", err, out)
}
return nil
}
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