49 lines
1.6 KiB
Go
49 lines
1.6 KiB
Go
// Copyright 2020 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package harness
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import (
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"context"
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"fmt"
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"net"
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"gvisor.dev/gvisor/pkg/test/dockerutil"
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"gvisor.dev/gvisor/pkg/test/testutil"
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)
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//TODO(gvisor.dev/issue/3535): move to own package or move methods to harness struct.
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// WaitUntilServing grabs a container from `machine` and waits for a server at
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// IP:port.
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func WaitUntilServing(ctx context.Context, machine Machine, server net.IP, port int) error {
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var logger testutil.DefaultLogger = "util"
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netcat := machine.GetNativeContainer(ctx, logger)
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defer netcat.CleanUp(ctx)
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cmd := fmt.Sprintf("while ! wget -q --spider http://%s:%d; do true; done", server, port)
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_, err := netcat.Run(ctx, dockerutil.RunOpts{
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Image: "benchmarks/util",
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}, "sh", "-c", cmd)
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return err
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}
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// DropCaches drops caches on the provided machine. Requires root.
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func DropCaches(machine Machine) error {
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if out, err := machine.RunCommand("/bin/sh", "-c", "sync && sysctl vm.drop_caches=3"); err != nil {
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return fmt.Errorf("failed to drop caches: %v logs: %s", err, out)
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}
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return nil
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}
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