/
main.go
130 lines (105 loc) · 3.25 KB
/
main.go
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// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 main
import (
"context"
"flag"
"os"
"os/signal"
"syscall"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/runtime/v2/runc"
"github.com/containerd/containerd/runtime/v2/shim"
shimapi "github.com/containerd/containerd/runtime/v2/task"
"github.com/containerd/ttrpc"
"github.com/mdlayher/vsock"
"github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"golang.org/x/sys/unix"
)
const defaultPort = 10789
func main() {
var (
id string
port int
debug bool
)
flag.StringVar(&id, "id", "", "Shim task id")
flag.IntVar(&port, "port", defaultPort, "Vsock port to listen to")
flag.BoolVar(&debug, "debug", false, "Turn on debug mode")
flag.Parse()
if debug {
logrus.SetLevel(logrus.DebugLevel)
}
signals := make(chan os.Signal, 32)
signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM, unix.SIGCHLD)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
group, ctx := errgroup.WithContext(ctx)
// Create a runc task service that can be used via GRPC.
// This can be wrapped to add missing functionality (like
// running multiple containers inside one Firecracker VM)
log.G(ctx).WithField("id", id).Info("creating runc shim")
runcTaskService, err := runc.New(ctx, id, nil)
if err != nil {
log.G(ctx).WithError(err).Error("failed to create runc shim")
os.Exit(1)
}
taskService := NewTaskService(runcTaskService)
server, err := ttrpc.NewServer()
if err != nil {
log.G(ctx).WithError(err).Error("failed to create ttrpc server")
os.Exit(1)
}
shimapi.RegisterTaskService(server, taskService)
// Run ttrpc over vsock
log.G(ctx).WithField("port", port).Info("listening to vsock")
listener, err := vsock.Listen(uint32(port))
if err != nil {
log.G(ctx).WithError(err).Errorf("failed to listen to vsock on port %d", port)
os.Exit(1)
}
group.Go(func() error {
// TODO: this doesn't exit after server.Close when using vsock (listener.Accept remains blocked), need ugly workaround.
// Github issue to track: https://github.com/mdlayher/vsock/issues/19
return server.Serve(ctx, listener)
})
group.Go(func() error {
defer func() {
log.G(ctx).Info("stopping ttrpc server")
if err := server.Close(); err != nil {
log.G(ctx).WithError(err).Errorf("failed to close ttrpc server")
}
}()
for {
select {
case s := <-signals:
switch s {
case unix.SIGCHLD:
if err := shim.Reap(); err != nil {
log.G(ctx).WithError(err).Error("reap error")
}
case syscall.SIGINT, syscall.SIGTERM:
cancel()
return nil
}
case <-ctx.Done():
return ctx.Err()
}
}
})
if err := group.Wait(); err != nil {
log.G(ctx).WithError(err).Warn("shim error")
}
log.G(ctx).Info("done")
}