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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"
"strings"
"testing"
"github.com/docker/docker/api/types/mount"
"gvisor.dev/gvisor/pkg/cleanup"
"gvisor.dev/gvisor/pkg/test/dockerutil"
"gvisor.dev/gvisor/pkg/test/testutil"
)
//TODO(gvisor.dev/issue/3535): move to own package or move methods to harness struct.
// 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 = "util"
netcat := machine.GetNativeContainer(ctx, logger)
defer netcat.CleanUp(ctx)
cmd := fmt.Sprintf("while ! wget -q --spider http://%s:%d; do true; done", server, port)
_, err := netcat.Run(ctx, dockerutil.RunOpts{
Image: "benchmarks/util",
}, "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
}
// DebugLog prints debug messages if the debug flag is set.
func DebugLog(b *testing.B, msg string, args ...interface{}) {
b.Helper()
if *debug {
b.Logf(msg, args...)
}
}
// FileSystemType represents a type container mount.
type FileSystemType string
const (
// BindFS indicates a bind mount should be created.
BindFS FileSystemType = "bindfs"
// TmpFS indicates a tmpfs mount should be created.
TmpFS FileSystemType = "tmpfs"
// RootFS indicates no mount should be created and the root mount should be used.
RootFS FileSystemType = "rootfs"
)
// MakeMount makes a mount and cleanup based on the requested type. Bind
// and volume mounts are backed by a temp directory made with mktemp.
// tmpfs mounts require no such backing and are just made.
// rootfs mounts do not make a mount, but instead return a target direectory at root.
// It is up to the caller to call Clean on the passed *cleanup.Cleanup
func MakeMount(machine Machine, fsType FileSystemType, cu *cleanup.Cleanup) ([]mount.Mount, string, error) {
mounts := make([]mount.Mount, 0, 1)
target := "/data"
switch fsType {
case BindFS:
dir, err := machine.RunCommand("mktemp", "-d")
if err != nil {
return mounts, "", fmt.Errorf("failed to create tempdir: %v", err)
}
dir = strings.TrimSuffix(dir, "\n")
cu.Add(func() {
machine.RunCommand("rm", "-rf", dir)
})
out, err := machine.RunCommand("chmod", "777", dir)
if err != nil {
return mounts, "", fmt.Errorf("failed modify directory: %v %s", err, out)
}
mounts = append(mounts, mount.Mount{
Target: target,
Source: dir,
Type: mount.TypeBind,
})
return mounts, target, nil
case RootFS:
return mounts, target, nil
case TmpFS:
mounts = append(mounts, mount.Mount{
Target: target,
Type: mount.TypeTmpfs,
})
return mounts, target, nil
default:
return mounts, "", fmt.Errorf("illegal mount type not supported: %v", fsType)
}
}
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