lock_folder/install_fast_media_lock.sh

#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
LAUNCHER="$SCRIPT_DIR/fast-media-lock"
TARGET="/usr/local/bin/fast-media-lock"
DEFAULT_WORKERS=8

if [[ ! -x "$LAUNCHER" ]]; then
  echo "[ERROR] launcher not found or not executable: $LAUNCHER" >&2
  exit 1
fi

TMP_WRAPPER="$(mktemp)"
trap 'rm -f "$TMP_WRAPPER"' EXIT

cat > "$TMP_WRAPPER" <<EOF
#!/usr/bin/env bash
set -euo pipefail

LAUNCHER="$LAUNCHER"
DEFAULT_WORKERS=$DEFAULT_WORKERS

if [[ ! -x "\$LAUNCHER" ]]; then
  echo "[ERROR] launcher not found or not executable: \$LAUNCHER" >&2
  exit 1
fi

args=("\$@")
has_workers=0
for arg in "\${args[@]}"; do
  case "\$arg" in
    --workers|--workers=*)
      has_workers=1
      break
      ;;
  esac
done

if [[ \$has_workers -eq 0 ]]; then
  case "\${1:-}" in
    lock|encrypt|unlock|decrypt|lock-name|encrypt-name|unlock-name|decrypt-name)
      args+=(--workers "\$DEFAULT_WORKERS")
      ;;
  esac
fi

exec "\$LAUNCHER" "\${args[@]}"
EOF

sudo install -m 755 "$TMP_WRAPPER" "$TARGET"

echo "Installed: $TARGET -> $LAUNCHER"
echo "Try: fast-media-lock -h"