func (d *directProcess) watch(cmd *exec.Cmd, exitSubscription *subreaper.Subscription) {
defer subreaper.Unsubscribe(exitSubscription)
defer d.delete()
f, err := os.OpenFile(path.Join(d.root, ExitFile), syscall.O_WRONLY, 0)
if err == nil {
defer f.Close()
}
exitCode := 0
if err = cmd.Wait(); err != nil {
if exitError, ok := err.(exec.ExitCodeError); ok {
exitCode = exitError.Code
}
}
if exitCode == 0 {
pid, err := d.getPidFromFile()
if err != nil {
return
}
exitSubscription.SetPid(pid)
exitCode = exitSubscription.Wait()
}
writeInt(path.Join(d.root, ExitStatusFile), exitCode)
}
func (d *directProcess) Start() error {
cwd, err := filepath.Abs(d.root)
if err != nil {
return err
}
stdin, stdout, stderr, err := d.openIO()
if err != nil {
return nil
}
checkpoint, err := d.loadCheckpoint(d.container.bundle)
if err != nil {
return err
}
logPath := filepath.Join(cwd, "log.json")
args := append([]string{
"--log", logPath,
"--log-format", "json",
}, d.container.runtimeArgs...)
if d.exec {
args = append(args, "exec",
"--process", filepath.Join(cwd, "process.json"),
"--console", d.consolePath,
)
} else if checkpoint != nil {
args = append(args, "restore",
"--image-path", filepath.Join(d.container.bundle, "checkpoints", checkpoint.Name),
)
add := func(flags ...string) {
args = append(args, flags...)
}
if checkpoint.Shell {
add("--shell-job")
}
if checkpoint.Tcp {
add("--tcp-established")
}
if checkpoint.UnixSockets {
add("--ext-unix-sk")
}
if d.container.noPivotRoot {
add("--no-pivot")
}
} else {
args = append(args, "start",
"--bundle", d.container.bundle,
"--console", d.consolePath,
)
if d.container.noPivotRoot {
args = append(args, "--no-pivot")
}
}
args = append(args,
"-d",
"--pid-file", filepath.Join(cwd, "pid"),
d.container.id,
)
cmd := exec.Command(d.container.runtime, args...)
cmd.Dir = d.container.bundle
cmd.Stdin = stdin
cmd.Stdout = stdout
cmd.Stderr = stderr
// set the parent death signal to SIGKILL so that if containerd dies the container
// process also dies
cmd.SysProcAttr = &syscall.SysProcAttr{
Pdeathsig: syscall.SIGKILL,
}
exitSubscription := subreaper.Subscribe()
err = d.startCmd(cmd)
if err != nil {
subreaper.Unsubscribe(exitSubscription)
d.delete()
return err
}
go d.watch(cmd, exitSubscription)
return nil
}