moby/daemon/start_linux.go

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package daemon // import "github.com/docker/docker/daemon"
import (
"context"
"fmt"
specs "github.com/opencontainers/runtime-spec/specs-go"
"github.com/docker/docker/container"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/libcontainerd/types"
"github.com/docker/docker/oci"
)
// initializeCreatedTask performs any initialization that needs to be done to
// prepare a freshly-created task to be started.
func (daemon *Daemon) initializeCreatedTask(ctx context.Context, tsk types.Task, container *container.Container, spec *specs.Spec) error {
if !container.Config.NetworkDisabled {
nspath, ok := oci.NamespacePath(spec, specs.NetworkNamespace)
if ok && nspath == "" { // the runtime has been instructed to create a new network namespace for tsk.
sb, err := daemon.netController.GetSandbox(container.ID)
if err != nil {
return errdefs.System(err)
}
if err := sb.SetKey(fmt.Sprintf("/proc/%d/ns/net", tsk.Pid())); err != nil {
return errdefs.System(err)
}
}
}
return nil
}