find_firmware_loaded.sh

#!/usr/bin/env bash
set -o errexit
set -o nounset
set -o pipefail

declare -A seen=()
declare -A unowned=()

check_dyndbg_enabled() {
  if grep -qw 'dyndbg="func fw_log_firmware_info +p"' /proc/cmdline && [[ -r /proc/dynamic_debug/control ]]; then
    echo "✔ dyndbg is set and control file is readable"
  else
    echo "⚠ dyndbg is not properly set or control file is missing" >&2
    exit 1
  fi
}

extract_firmware_paths() {
  # Extract firmware file names from journalctl logs of current boot
  journalctl -b --no-pager \
    | grep -oiE '((firmware file|loaded FW|found device firmware|DMC firmware)[^:]*:?\s*)?[a-zA-Z0-9._/-]+\.(bin|ri|ucode|tplg|sfi|ddc)' \
    | grep -oE '[a-zA-Z0-9._/-]+\.(bin|ri|ucode|tplg|sfi|ddc)' \
    | grep -vE '^usr\.bin($|/)' \
    | sort -u
}

find_firmware_path() {
  local firmware_dir="/usr/lib/firmware"
  local fw_file="$1"
  local path

  # Try exact matches including compressed variants
  for ext in "" ".zst" ".xz" ".gz"; do
    for candidate in "${firmware_dir}/${fw_file}${ext}" "${firmware_dir}"/*/"${fw_file}${ext}"; do
      [[ -e $candidate ]] && { echo "$candidate"; return 0; }
    done
  done

  # If not found, try prefix/suffix wildcard match in firmware_dir recursively (first match)
  path=$(find "${firmware_dir}" -type f -name "*${fw_file}*" 2>/dev/null | head -n 1 || true)
  if [[ -n $path ]]; then
    echo "$path"
    return 0
  fi

  # Not found at all
  return 1
}

list_firmware_owners() {
  local fw_file pkg normalized found_owner

  while read -r fw_file; do
    [[ -z "$fw_file" ]] && continue

    normalized=$(find_firmware_path "$fw_file" || true)
    if [[ -z "$normalized" ]]; then
      unowned["$fw_file"]=1
      continue
    fi

    if [[ -n "${seen[$normalized]+_}" ]]; then
      continue
    fi
    seen["$normalized"]=1

    found_owner=0
    if pkg=$(pacman --color=never -Qo "$normalized" 2>/dev/null | awk '{print $(NF-1)}'); then
      if [[ -n "$pkg" ]]; then
        printf '→ %-65s  owned by %s\n' "$normalized" "$pkg"
        found_owner=1
      fi
    fi

    [[ $found_owner -eq 0 ]] && unowned["$normalized"]=1
  done < <(extract_firmware_paths)
}

report_unowned_firmware() {
  if (( ${#unowned[@]} )); then
    echo
    echo "⚠ Unowned firmware files found:"
    for fw in "${!unowned[@]}"; do
      echo "  $fw"
    done
  else
    echo
    echo "✔ All loaded firmware files are known to pacman."
  fi
}

main() {
  check_dyndbg_enabled
  list_firmware_owners
  report_unowned_firmware
}

main "$@"