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r.destroy can defer exec in runner.run method. #2038

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Merged
merged 1 commit into from
May 7, 2019
Merged

r.destroy can defer exec in runner.run method. #2038

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22 changes: 9 additions & 13 deletions utils_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -266,13 +266,17 @@ type runner struct {
}

func (r *runner) run(config *specs.Process) (int, error) {
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The correct way of handling this would've been to use (_ int, Err error) and then using the error in the defer. Otherwise, if you have a return -1, fmt.Errorf() you will treat it as a nil.

if err := r.checkTerminal(config); err != nil {
r.destroy()
var err error
defer func() {
if err != nil {
r.destroy()
}
}()
if err = r.checkTerminal(config); err != nil {
return -1, err
}
process, err := newProcess(*config, r.init)
if err != nil {
r.destroy()
return -1, err
}
if len(r.listenFDs) > 0 {
Expand All @@ -281,21 +285,18 @@ func (r *runner) run(config *specs.Process) (int, error) {
}
baseFd := 3 + len(process.ExtraFiles)
for i := baseFd; i < baseFd+r.preserveFDs; i++ {
_, err := os.Stat(fmt.Sprintf("/proc/self/fd/%d", i))
_, err = os.Stat(fmt.Sprintf("/proc/self/fd/%d", i))
if err != nil {
r.destroy()
return -1, errors.Wrapf(err, "please check that preserved-fd %d (of %d) is present", i-baseFd, r.preserveFDs)
}
process.ExtraFiles = append(process.ExtraFiles, os.NewFile(uintptr(i), "PreserveFD:"+strconv.Itoa(i)))
}
rootuid, err := r.container.Config().HostRootUID()
if err != nil {
r.destroy()
return -1, err
}
rootgid, err := r.container.Config().HostRootGID()
if err != nil {
r.destroy()
return -1, err
}
var (
Expand All @@ -307,7 +308,6 @@ func (r *runner) run(config *specs.Process) (int, error) {
handler := newSignalHandler(r.enableSubreaper, r.notifySocket)
tty, err := setupIO(process, rootuid, rootgid, config.Terminal, detach, r.consoleSocket)
if err != nil {
r.destroy()
return -1, err
}
defer tty.Close()
Expand All @@ -323,23 +323,19 @@ func (r *runner) run(config *specs.Process) (int, error) {
panic("Unknown action")
}
if err != nil {
r.destroy()
return -1, err
}
if err := tty.waitConsole(); err != nil {
if err = tty.waitConsole(); err != nil {
r.terminate(process)
r.destroy()
return -1, err
}
if err = tty.ClosePostStart(); err != nil {
r.terminate(process)
r.destroy()
return -1, err
}
if r.pidFile != "" {
if err = createPidFile(r.pidFile, process); err != nil {
r.terminate(process)
r.destroy()
return -1, err
}
}
Expand Down