bmm-mp3_watchdog

#!/bin/bash
# Watchdog to convert audio files to mp3.
# waits 10 min after allowed file has been created
# and runs bmm-converter_mp3 --auto
# Requires: inotify-tools and ext4 partition
# Tarso Galvao 07-out-2023 debian 12

## Load environment variables
if [ -f "$HOME/bmm/.env" ]; then
  . "$HOME/bmm/.env"
else
  echo -e "FATAL ERROR: .env not found.\n
  Use bmm-setup_environment to create one.\nAborting..."
  exit 1
fi

# Audio directory to monitor (loaded from AUDIOROOT in .env)
MONITOR_DIR="$AUDIOROOT"
# Command to execute when a new file is created
COMMAND_TO_EXECUTE="bmm-converter_mp3 --auto"
# Flag file to track whether the command has been executed
FLAG_FILE="$HOME/bmm/command_executed.flag"
# Array of allowed file extensions
ALLOWED_EXTENSIONS=("flac" "wav" "ape" "m4a" "ogg" "wma")

# Function to check if a file has an allowed extension
is_allowed_extension() {
  local file="$1"
  local extension="${file##*.}" # Get the file's extension
  for ext in "${ALLOWED_EXTENSIONS[@]}"; do
    if [ "$extension" == "$ext" ]; then
      return 0 # Extension is allowed
    fi
  done
  return 1 # Extension is not allowed
}

# Function to monitor the directory for file creation
monitor_directory() {
  # Use inotifywait to watch for file creation events (-e create) in the specified directory
  inotifywait -m -e create "$MONITOR_DIR" | while read -r directory event file; do
    # Check if the event is a new file creation
    if [ "$event" == "CREATE" ]; then
      # Get the path of the created file
      created_file="$directory/$file"
      # Check if the created file has an allowed extension
      if is_allowed_extension "$created_file"; then
        echo -e "New allowed file created: $created_file."
        # Set the flag to indicate that the command should be executed
        touch "$FLAG_FILE"
      else
        # Log the event if the file has a disallowed extension
        echo "New disallowed file created: $created_file. Ignoring."
      fi
    fi
  done
}

# Function to execute the command if the flag is set
execute_command() {
  if [ -e "$FLAG_FILE" ]; then
    echo "Executing the command: $COMMAND_TO_EXECUTE"
    eval "$COMMAND_TO_EXECUTE" >/dev/null 2>&1
    echo "Command executed."
    # Remove the flag file
    rm "$FLAG_FILE"
  fi
}

# Check dependencies
dep_check inotify-tools

# Start monitoring the directory for file creation
echo -e "Monitoring $AUDIOROOT..."
monitor_directory &

# Periodically check if the command should be executed
while true; do
  execute_command
  sleep 600  # 10 min
done