feat: Check if shared folder is writeable (#1531)

  local cfg="$5"

  local owner=""

  if [ ! -d "$dir" ]; then

    if ! mkdir -p "$dir"; then

    error "Failed to create directory $dir." && return 1

      error "Failed to create shared folder ($dir)." && return 1

    fi

  fi

  if ! ls -A "$dir" >/dev/null 2>&1; then

    msg="Failed to access directory $dir."

    msg="No permission to access shared folder ($dir)."

    msg+=" If SELinux is active, you need to add the \":Z\" flag to the bind mount."

    error "$msg" && return 1

  fi

  if [ ! -w "$dir" ]; then

    msg="shared folder ($dir) is not writeable!"

    warn "$msg"

  fi

  if [ -z "$(ls -A "$dir")" ]; then

    if ! chmod 2777 "$dir"; then

      error "Failed to set permissions for directory $dir" && return 1