91 lines
2.6 KiB
Go
91 lines
2.6 KiB
Go
// +build linux
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package linux
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import (
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"context"
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"fmt"
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"net"
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"os/exec"
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"path/filepath"
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"syscall"
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"time"
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"google.golang.org/grpc"
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"github.com/containerd/containerd/api/services/shim/v1"
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localShim "github.com/containerd/containerd/linux/shim"
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"github.com/containerd/containerd/log"
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"github.com/containerd/containerd/reaper"
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"github.com/containerd/containerd/sys"
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"github.com/pkg/errors"
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)
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func newShim(ctx context.Context, shimName string, path, namespace string, remote bool) (shim.ShimClient, error) {
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if !remote {
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return localShim.Client(path, namespace)
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}
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socket := filepath.Join(path, "shim.sock")
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l, err := sys.CreateUnixSocket(socket)
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if err != nil {
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return nil, err
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}
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cmd := exec.Command(shimName, "--namespace", namespace)
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cmd.Dir = path
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f, err := l.(*net.UnixListener).File()
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if err != nil {
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return nil, err
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}
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// close our side of the socket, do not close the listener as it will
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// remove the socket from disk
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defer f.Close()
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cmd.ExtraFiles = append(cmd.ExtraFiles, f)
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// make sure the shim can be re-parented to system init
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// and is cloned in a new mount namespace because the overlay/filesystems
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// will be mounted by the shim
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cmd.SysProcAttr = &syscall.SysProcAttr{
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Cloneflags: syscall.CLONE_NEWNS,
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Setpgid: true,
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}
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if err := reaper.Default.Start(cmd); err != nil {
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return nil, errors.Wrapf(err, "failed to start shim")
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}
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defer func() {
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if err != nil {
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cmd.Process.Kill()
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reaper.Default.Wait(cmd)
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} else {
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log.G(ctx).WithField("socket", socket).Infof("new shim started")
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}
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}()
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if err = sys.SetOOMScore(cmd.Process.Pid, sys.OOMScoreMaxKillable); err != nil {
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return nil, errors.Wrap(err, "failed to set OOM Score on shim")
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}
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return connectShim(socket)
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}
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func loadShim(path, namespace string, remote bool) (shim.ShimClient, error) {
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if !remote {
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return localShim.Client(path, namespace)
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}
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socket := filepath.Join(path, "shim.sock")
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return connectShim(socket)
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}
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func connectShim(socket string) (shim.ShimClient, error) {
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// reset the logger for grpc to log to dev/null so that it does not mess with our stdio
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dialOpts := []grpc.DialOption{grpc.WithInsecure(), grpc.WithTimeout(100 * time.Second)}
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dialOpts = append(dialOpts,
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grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
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return net.DialTimeout("unix", socket, timeout)
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}),
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grpc.WithBlock(),
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grpc.WithTimeout(2*time.Second),
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)
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conn, err := grpc.Dial(fmt.Sprintf("unix://%s", socket), dialOpts...)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to connect to shim via \"%s\"", fmt.Sprintf("unix://%s", socket))
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}
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return shim.NewShimClient(conn), nil
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}
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