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create.go
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create.go
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package netnsbuilder
import (
"context"
"os"
"os/exec"
"syscall"
"github.com/Scalingo/sand/api/types"
"github.com/Scalingo/sand/config"
"github.com/docker/docker/pkg/reexec"
"github.com/pkg/errors"
)
var (
ErrAlreadyExist = errors.New("network namespace already exists")
)
type Manager interface {
Create(context.Context, string, types.Network) error
}
type manager struct {
Config *config.Config
}
func NewManager(c *config.Config) Manager {
return &manager{Config: c}
}
func (m *manager) Create(ctx context.Context, name string, n types.Network) error {
_, err := os.Stat(n.NSHandlePath)
if !os.IsNotExist(err) && err != nil {
return errors.Wrap(err, "fail to create namespace")
} else if err == nil {
return ErrAlreadyExist
}
err = m.createNS(ctx, n.NSHandlePath)
if err != nil {
return errors.Wrapf(err, "fail to create new namespace")
}
return nil
}
func (m *manager) createNS(ctx context.Context, path string) error {
f, err := os.Create(path)
if err != nil {
return errors.Wrap(err, "fail to touch netns mountpoint file")
}
err = f.Close()
if err != nil {
return errors.Wrap(err, "fail to close netns mountpoint file")
}
cmd := &exec.Cmd{
Path: reexec.Self(),
Args: append([]string{"sc-netns-create"}, path),
Stdout: os.Stdout,
Stderr: os.Stderr,
}
cmd.SysProcAttr = &syscall.SysProcAttr{}
cmd.SysProcAttr.Cloneflags = syscall.CLONE_NEWNET
if err = cmd.Run(); err != nil {
return errors.Wrap(err, "namespace creation reexec command failed")
}
return nil
}