#/usr/bin/env bash

PRE_STOP_LOG_ROLE="${PRE_STOP_LOG_ROLE:-master}"
source $(dirname "$0")/termination-env

{

log "The hook has started: %s" \
  "$(parameters_string \
    "marker_file" \
    "heartbeat_file" \
    "bailout_file" \
    "handler" \
  )"

touch "$heartbeat_file"

set -o pipefail
eval "$handler" 2>&1 | while IFS= read -r line; do
  # we check the files here and break early, but overall script termination
  # happens later - as we need to distinguish between files detection and
  # command failure, while bash doesn't offer a simple way to do this here
  # inside the loop (`exit` does not terminate the script)
  [[ -f $bailout_file ]] && break
  [[ -f $marker_file ]] && break

  log "[handler] %s" "$line"
  touch "$heartbeat_file"
done
ec=$?
set +o pipefail

# process various cases in specific order
check_bailout

if [[ -f $marker_file ]]; then
  log "Done! The marker file has been detected, assuming some other instance of the script has run to completion"
  exit 0
elif [[ $ec -ne 0 ]]; then
  log "The handler has failed with \"%d\" exit code, failing the hook script too" \
    $ec
  # signal others to bail out
  touch "$bailout_file"
  exit $ec
else
  log "Done! Generating the marker file allowing to proceed to termination"
  touch "$marker_file"
fi

} > "$stdout" 2> "$stderr"