func (l *HookListener) writeHook(event string, hookPod *pods.Pod, manifest *pods.Manifest) error {
eventExecDir := path.Join(l.ExecDir, event)
err := os.MkdirAll(eventExecDir, 0755)
if err != nil {
return util.Errorf("Couldn't make event exec dir %s", eventExecDir)
}
launchables, err := hookPod.Launchables(manifest)
if err != nil {
return err
}
// First remove any pre-existing hooks for that pod. Note that this is gross
// and that we should have hooks recurse into subfolders.
podHookPattern := path.Join(eventExecDir, fmt.Sprintf("%s__*", hookPod.Id))
matches, err := filepath.Glob(podHookPattern)
if err != nil {
return util.Errorf("Couldn't find files using pattern %s in %s: %s", podHookPattern, eventExecDir, err)
}
for _, match := range matches {
err = os.Remove(match)
if err != nil {
l.Logger.WithField("err", err).Warnln("Could not remove old hook")
}
}
// For every launchable in the manifest, link its executable to the hook directory.
for _, launchable := range launchables {
// warn if a hook has a cgroup configured - it will be ignored
emptyCgroup := cgroups.Config{Name: launchable.CgroupConfig.Name}
if launchable.CgroupConfig != emptyCgroup {
l.Logger.WithField("hook_launchable_id", launchable.Id).Warnln("Hook cgroup will be ignored")
}
executables, err := launchable.Executables(runit.DefaultBuilder)
if err != nil {
return err
}
for _, executable := range executables {
// Write a script to the event directory that executes the pod's executables
// with the correct environment for that pod.
scriptPath := path.Join(eventExecDir, executable.Service.Name)
file, err := os.OpenFile(scriptPath, os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0744)
defer file.Close()
if err != nil {
l.Logger.WithField("err", err).Errorln("Could not write to event dir path")
}
err = executable.WriteExecutor(file)
if err != nil {
l.Logger.WithField("err", err).Errorln("Could not install new hook")
}
}
// for convenience as we do with regular launchables, make these ones
// current under the launchable directory
err = launchable.MakeCurrent()
if err != nil {
l.Logger.WithField("err", err).Errorln("Could not update the current hook")
}
}
return nil
}
// Populates the given directory with executor scripts for each launch script of
// the given pod, which must be installed. Any orphaned executor scripts (from a
// past install, but no longer present in this pod) will be cleaned out.
func InstallHookScripts(dir string, hookPod *pods.Pod, manifest pods.Manifest, logger logging.Logger) error {
err := os.MkdirAll(dir, 0755)
if err != nil {
return err
}
// TODO: globbing based on the structure of the name is gross, each hook pod
// should have its own dir of scripts and running hooks should iterate over
// the directories
rmPattern := filepath.Join(dir, fmt.Sprintf("%s__*", hookPod.Id))
matches, err := filepath.Glob(rmPattern)
if err != nil {
// error return from filepath.Glob is guaranteed to be ErrBadPattern
return util.Errorf("error while removing old hook scripts: pattern %q is malformed", rmPattern)
}
for _, match := range matches {
err = os.Remove(match)
if err != nil {
logger.WithErrorAndFields(err, logrus.Fields{"script_path": match}).Errorln("Could not remove old hook script")
}
}
launchables, err := hookPod.Launchables(manifest)
if err != nil {
return err
}
for _, launchable := range launchables {
if launchable.Type() != "hoist" {
logger.WithFields(logrus.Fields{
"id": launchable.ID(),
"type": launchable.Type(),
}).Errorln("hook disabled: unsupported launchable type")
continue
}
executables, err := launchable.Executables(runit.DefaultBuilder)
if err != nil {
return err
}
for _, executable := range executables {
// Write a script to the event directory that executes the pod's executables
// with the correct environment for that pod.
scriptPath := filepath.Join(dir, executable.Service.Name)
file, err := os.OpenFile(scriptPath, os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0744)
defer file.Close()
if err != nil {
logger.WithErrorAndFields(err, logrus.Fields{"script_path": scriptPath}).Errorln("Could not open new hook script")
}
err = executable.WriteExecutor(file)
if err != nil {
logger.WithErrorAndFields(err, logrus.Fields{"script_path": scriptPath}).Errorln("Could not write new hook script")
}
}
// for convenience as we do with regular launchables, make these ones
// current under the launchable directory
err = launchable.MakeCurrent()
if err != nil {
logger.WithErrorAndFields(err, logrus.Fields{"launchable_id": launchable.ID()}).
Errorln("Could not set hook launchable to current")
}
}
return nil
}