| // +build linux |
| |
| /* |
| Copyright 2018 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License 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 nsenter |
| |
| import ( |
| "context" |
| "fmt" |
| "path/filepath" |
| |
| "k8s.io/klog" |
| "k8s.io/utils/exec" |
| ) |
| |
| // Executor wraps executor interface to be executed via nsenter |
| type Executor struct { |
| // Exec implementation |
| executor exec.Interface |
| // Path to the host's root proc path |
| hostProcMountNsPath string |
| } |
| |
| // NewNsenterExecutor returns new nsenter based executor |
| func NewNsenterExecutor(hostRootFsPath string, executor exec.Interface) *Executor { |
| hostProcMountNsPath := filepath.Join(hostRootFsPath, mountNsPath) |
| nsExecutor := &Executor{ |
| hostProcMountNsPath: hostProcMountNsPath, |
| executor: executor, |
| } |
| return nsExecutor |
| } |
| |
| // Command returns a command wrapped with nenter |
| func (nsExecutor *Executor) Command(cmd string, args ...string) exec.Cmd { |
| fullArgs := append([]string{fmt.Sprintf("--mount=%s", nsExecutor.hostProcMountNsPath), "--"}, |
| append([]string{cmd}, args...)...) |
| klog.V(5).Infof("Running nsenter command: %v %v", nsenterPath, fullArgs) |
| return nsExecutor.executor.Command(nsenterPath, fullArgs...) |
| } |
| |
| // CommandContext returns a CommandContext wrapped with nsenter |
| func (nsExecutor *Executor) CommandContext(ctx context.Context, cmd string, args ...string) exec.Cmd { |
| fullArgs := append([]string{fmt.Sprintf("--mount=%s", nsExecutor.hostProcMountNsPath), "--"}, |
| append([]string{cmd}, args...)...) |
| klog.V(5).Infof("Running nsenter command: %v %v", nsenterPath, fullArgs) |
| return nsExecutor.executor.CommandContext(ctx, nsenterPath, fullArgs...) |
| } |
| |
| // LookPath returns a LookPath wrapped with nsenter |
| func (nsExecutor *Executor) LookPath(file string) (string, error) { |
| return "", fmt.Errorf("not implemented, error looking up : %s", file) |
| } |