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process.go
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process.go
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package service
import (
"context"
"os"
"os/exec"
)
func process(cmd string, args []string, envs []string, pid int) (int, context.CancelFunc, error) {
if pid != 0 {
log.Debugf("process pid %d", pid)
err := kill(pid)
if err != nil {
return 0, nil, err
}
}
return startProcess(cmd, args, envs)
}
func kill(pid int) error {
ps, err := os.FindProcess(pid)
if err != nil {
log.Errorf("find process error %s", err)
return err
}
err = ps.Kill()
if err != nil {
return err
}
_, err = ps.Wait()
return err
}
func startProcess(execPath string, args []string, envs []string) (int, context.CancelFunc, error) {
ctx, cancel := context.WithCancel(context.Background())
cmd := exec.CommandContext(ctx, execPath)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Args = args
cmd.Env = append(os.Environ(), envs...)
err := cmd.Start()
if err != nil {
log.Errorf("start command %s %+v error", execPath, args)
return 0, cancel, err
}
go func() {
_ = cmd.Wait()
}()
return cmd.Process.Pid, cancel, nil
}