146 lines
2.9 KiB
Go
146 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 proc
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import (
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"encoding/json"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"sync"
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"time"
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"github.com/containerd/containerd/errdefs"
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runc "github.com/containerd/go-runc"
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"github.com/pkg/errors"
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"golang.org/x/sys/unix"
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)
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// safePid is a thread safe wrapper for pid.
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type safePid struct {
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sync.Mutex
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pid int
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}
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func (s *safePid) get() int {
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s.Lock()
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defer s.Unlock()
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return s.pid
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}
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// TODO(mlaventure): move to runc package?
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func getLastRuntimeError(r *runc.Runc) (string, error) {
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if r.Log == "" {
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return "", nil
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}
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f, err := os.OpenFile(r.Log, os.O_RDONLY, 0400)
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if err != nil {
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return "", err
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}
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defer f.Close()
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var (
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errMsg string
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log struct {
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Level string
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Msg string
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Time time.Time
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}
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)
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dec := json.NewDecoder(f)
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for err = nil; err == nil; {
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if err = dec.Decode(&log); err != nil && err != io.EOF {
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return "", err
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}
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if log.Level == "error" {
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errMsg = strings.TrimSpace(log.Msg)
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}
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}
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return errMsg, nil
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}
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// criuError returns only the first line of the error message from criu
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// it tries to add an invalid dump log location when returning the message
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func criuError(err error) string {
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parts := strings.Split(err.Error(), "\n")
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return parts[0]
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}
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func copyFile(to, from string) error {
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ff, err := os.Open(from)
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if err != nil {
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return err
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}
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defer ff.Close()
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tt, err := os.Create(to)
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if err != nil {
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return err
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}
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defer tt.Close()
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p := bufPool.Get().(*[]byte)
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defer bufPool.Put(p)
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_, err = io.CopyBuffer(tt, ff, *p)
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return err
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}
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func checkKillError(err error) error {
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if err == nil {
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return nil
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}
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if strings.Contains(err.Error(), "os: process already finished") ||
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strings.Contains(err.Error(), "container not running") ||
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err == unix.ESRCH {
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return errors.Wrapf(errdefs.ErrNotFound, "process already finished")
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}
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return errors.Wrapf(err, "unknown error after kill")
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}
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// InitPidFile name of the file that contains the init pid
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const InitPidFile = "init.pid"
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func newPidFile(bundle string) *pidFile {
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return &pidFile{
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path: filepath.Join(bundle, InitPidFile),
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}
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}
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func newExecPidFile(bundle, id string) *pidFile {
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return &pidFile{
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path: filepath.Join(bundle, fmt.Sprintf("%s.pid", id)),
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}
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}
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type pidFile struct {
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path string
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}
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func (p *pidFile) Path() string {
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return p.path
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}
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func (p *pidFile) Read() (int, error) {
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return runc.ReadPidFile(p.path)
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}
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