6ba4ddfdda
A fifo on unix or named pipe on Windows will be provided to the shim. It can be located inside the `cwd` of the shim named "log". The shims can use the existing `github.com/containerd/containerd/log` package to log debug messages. Messages will automatically be output in the containerd's daemon logs with the correct fiels and runtime set. Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
118 lines
2.9 KiB
Go
118 lines
2.9 KiB
Go
// +build !windows
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package shim
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import (
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"bytes"
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"context"
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"io"
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"net"
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"os"
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"os/exec"
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"os/signal"
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"syscall"
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"github.com/containerd/containerd/events"
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"github.com/containerd/containerd/namespaces"
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"github.com/containerd/fifo"
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"github.com/containerd/typeurl"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"golang.org/x/sys/unix"
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)
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// setupSignals creates a new signal handler for all signals and sets the shim as a
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// sub-reaper so that the container processes are reparented
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func setupSignals() (chan os.Signal, error) {
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signals := make(chan os.Signal, 32)
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signal.Notify(signals, unix.SIGTERM, unix.SIGINT, unix.SIGCHLD, unix.SIGPIPE)
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return signals, nil
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}
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func setupDumpStacks(dump chan<- os.Signal) {
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signal.Notify(dump, syscall.SIGUSR1)
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}
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func serveListener(path string) (net.Listener, error) {
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var (
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l net.Listener
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err error
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)
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if path == "" {
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l, err = net.FileListener(os.NewFile(3, "socket"))
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path = "[inherited from parent]"
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} else {
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if len(path) > 106 {
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return nil, errors.Errorf("%q: unix socket path too long (> 106)", path)
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}
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l, err = net.Listen("unix", "\x00"+path)
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}
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if err != nil {
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return nil, err
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}
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logrus.WithField("socket", path).Debug("serving api on abstract socket")
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return l, nil
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}
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func handleSignals(logger *logrus.Entry, signals chan os.Signal) error {
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logger.Info("starting signal loop")
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for {
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select {
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case s := <-signals:
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switch s {
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case unix.SIGCHLD:
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if err := Reap(); err != nil {
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logger.WithError(err).Error("reap exit status")
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}
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case unix.SIGPIPE:
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}
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}
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}
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}
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func openLog(ctx context.Context, _ string) (io.Writer, error) {
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return fifo.OpenFifo(context.Background(), "log", unix.O_WRONLY, 0700)
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}
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func (l *remoteEventsPublisher) Publish(ctx context.Context, topic string, event events.Event) error {
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ns, _ := namespaces.Namespace(ctx)
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encoded, err := typeurl.MarshalAny(event)
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if err != nil {
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return err
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}
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data, err := encoded.Marshal()
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if err != nil {
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return err
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}
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cmd := exec.CommandContext(ctx, l.containerdBinaryPath, "--address", l.address, "publish", "--topic", topic, "--namespace", ns)
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cmd.Stdin = bytes.NewReader(data)
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c, err := Default.Start(cmd)
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if err != nil {
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return err
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}
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status, err := Default.Wait(cmd, c)
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if err != nil {
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return err
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}
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if status != 0 {
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return errors.New("failed to publish event")
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}
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return nil
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}
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