supervisor process restart when PHP files are updated with a delayed timer preventing chain reaction of restarts

process-file-changes-watcher.sh

#!/bin/bash

WATCH_DIR="/your-path/"
PROCESS_NAME="supervisor-process-name"
RESTART_DELAY=30
TIMER_FILE="/tmp/supervisor_restart_timer"

echo "Watching $WATCH_DIR for changes..."

# echo "Watch $1 for file changes..."

# Be careful not to confuse the output of `inotifywait` with that of `echo`.
# e.g. missing a `\` would break the pipe and write inotifywait's output, not
# the echo's.

inotifywait \
  --monitor \
  -r -e close_write,modify $WATCH_DIR \
  --timefmt '%Y-%m-%dT%H:%M:%S' \
  --format '%T %w %f %e' \
| while read datetime dir filename event; do
  echo $filename;
  if [[ $filename == *.php ]]; then
    echo "$datetime: $filename was $event"

    # If timer file doesn't exist, create it and start countdown
    if [ ! -f "$TIMER_FILE" ]; then
      echo "Starting restart countdown for $RESTART_DELAY seconds."
      touch "$TIMER_FILE"

      # Background restart process
      (
        sleep $RESTART_DELAY
        if [ -f "$TIMER_FILE" ]; then
          echo "$(date): Executing restart of $PROCESS_NAME"
          supervisorctl restart "$PROCESS_NAME"
          rm -f "$TIMER_FILE"
        fi
      ) &
    else
      echo "Restart already scheduled, ignoring change"
    fi
  fi
done