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libcontainerd/supervisor: use pkg/pidfile for reading and writing pidfile

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Also updated a variable name that collided with a package const.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2022-10-15 16:56:25 +02:00
parent 14da1bfe40
commit cea8e9b583
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GPG key ID: 76698F39D527CE8C
1 changed files with 7 additions and 37 deletions
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44
libcontainerd/supervisor/remote_daemon.go
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@ -2,18 +2,17 @@ package supervisor // import "github.com/docker/docker/libcontainerd/supervisor"
import (
"context"
"io"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
"github.com/containerd/containerd"
"github.com/containerd/containerd/services/server/config"
"github.com/containerd/containerd/sys"
"github.com/docker/docker/pkg/pidfile"
"github.com/docker/docker/pkg/process"
"github.com/docker/docker/pkg/system"
"github.com/pelletier/go-toml"
@ -125,34 +124,6 @@ func (r *remote) WaitTimeout(d time.Duration) error {
func (r *remote) Address() string {
return r.GRPC.Address
}
func (r *remote) getContainerdPid() (int, error) {
f, err := os.OpenFile(r.pidFile, os.O_RDWR, 0600)
if err != nil {
if os.IsNotExist(err) {
return -1, nil
}
return -1, err
}
defer f.Close()
b := make([]byte, 8)
n, err := f.Read(b)
if err != nil && err != io.EOF {
return -1, err
}
if n > 0 {
pid, err := strconv.ParseUint(string(b[:n]), 10, 64)
if err != nil {
return -1, err
}
if process.Alive(int(pid)) {
return int(pid), nil
}
}
return -1, nil
}
func (r *remote) getContainerdConfig() (string, error) {
f, err := os.OpenFile(r.configFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
@ -168,23 +139,22 @@ func (r *remote) getContainerdConfig() (string, error) {
}
func (r *remote) startContainerd() error {
pid, err := r.getContainerdPid()
if err != nil {
pid, err := pidfile.Read(r.pidFile)
if err != nil && !errors.Is(err, os.ErrNotExist) {
return err
}
if pid != -1 {
if pid > 0 {
r.daemonPid = pid
r.logger.WithField("pid", pid).Infof("%s is still running", binaryName)
return nil
}
configFile, err := r.getContainerdConfig()
cfgFile, err := r.getContainerdConfig()
if err != nil {
return err
}
args := []string{"--config", configFile}
args := []string{"--config", cfgFile}
if r.logLevel != "" {
args = append(args, "--log-level", r.logLevel)
@ -237,7 +207,7 @@ func (r *remote) startContainerd() error {
r.logger.WithError(err).Warn("failed to adjust OOM score")
}
err = os.WriteFile(r.pidFile, []byte(strconv.Itoa(r.daemonPid)), 0660)
err = pidfile.Write(r.pidFile, r.daemonPid)
if err != nil {
process.Kill(r.daemonPid)
return errors.Wrap(err, "libcontainerd: failed to save daemon pid to disk")