Feature request - S3 Sleep: allow pre-run script to abort sleep via exit code

[mdunaiski]

Currently the preRun script is executed in pre_sleep_activity(), but its exit code is ignored, so sleep always continues.
It would be useful if a non-zero exit status could prevent sleep until the next scheduled run/check.

Something like this may work:

pre_sleep_activity() {
...
if [[ -x $preRun ]]; then
  log "Execute custom commands before sleep"

  if ! "$preRun"; then
    log "Pre-sleep script returned a failure status. Aborting sleep."
    return 1
  fi
fi

system_sleep() {
# Do pre-sleep activities
  if ! pre_sleep_activity; then
    log "Sleep cancelled by pre-sleep script."
    return 1
  fi
...