mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
42 lines
871 B
Go
42 lines
871 B
Go
package pidfile
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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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 checkPidFileAlreadyExists(path string) error {
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if pidString, err := ioutil.ReadFile(path); err == nil {
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if pid, err := strconv.Atoi(string(pidString)); err == nil {
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if _, err := os.Stat(filepath.Join("/proc", string(pid))); err == nil {
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return fmt.Errorf("pid file found, ensure docker is not running or delete %s", path)
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}
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}
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}
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return nil
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}
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func New(path string) (*PidFile, error) {
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if err := checkPidFileAlreadyExists(path); err != nil {
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return nil, err
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}
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if err := ioutil.WriteFile(path, []byte(fmt.Sprintf("%d", os.Getpid())), 0644); err != nil {
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return nil, err
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}
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return &PidFile{path: path}, nil
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}
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func (file PidFile) Remove() error {
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if err := os.Remove(file.path); err != nil {
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return err
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}
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return nil
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}
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