InstallMicrocode.sh

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

BASE_URL="https://ftp.debian.org/debian/pool/non-free-firmware"

fetch_latest_deb() {
  local subdir=$1
  curl -fsSL "$BASE_URL/$subdir/" \
    | grep -Eo 'href="[^"]+amd64.deb"' \
    | sed 's/^href="//;s/"$//' \
    | sort -V \
    | tail -n1
}

install_intel() {
  echo "→ Installing helper package iucode-tool…"
  apt-get update -qq
  apt-get install -y iucode-tool >/dev/null

  local pkg=$(fetch_latest_deb "i/intel-microcode")
  echo "→ Downloading $pkg…"
  curl -fsSL "$BASE_URL/i/intel-microcode/$pkg" -o "$pkg"

  echo "→ Installing $pkg…"
  dpkg -i "$pkg" >/dev/null

  rm -f "$pkg"
  echo -e "\n✔ Intel microcode installed. Please reboot to apply.\n"
}

install_amd() {
  echo "→ Fetching AMD microcode list…"
  apt-get update -qq

  local pkg=$(fetch_latest_deb "a/amd64-microcode")
  echo "→ Downloading $pkg…"
  curl -fsSL "$BASE_URL/a/amd64-microcode/$pkg" -o "$pkg"

  echo "→ Installing $pkg…"
  dpkg -i "$pkg" >/dev/null

  rm -f "$pkg"
  echo -e "\n✔ AMD microcode installed. Please reboot to apply.\n"
}

if [[ ${1-} == intel ]]; then
  install_intel
elif [[ ${1-} == amd ]]; then
  install_amd
else
  echo "Usage: $0 {intel|amd}"
  exit 1
fi