diff --git a/.github/workflows/bullseye-aarch64-sysroot.yaml b/.github/workflows/bullseye-aarch64-sysroot.yaml
new file mode 100644
index 0000000..844cc37
--- /dev/null
+++ b/.github/workflows/bullseye-aarch64-sysroot.yaml
@@ -0,0 +1,31 @@
+---
+name: bullseye-aarch64 sysroot
+on:
+  pull_request:
+    paths:
+      - "sysroot/**"
+      - .github/workflows/bullseye-aarch64-sysroot.yaml
+  push:
+    tags:
+      - "bullseye-aarch64-sysroot-*"
+
+jobs:
+  toolchains:
+    runs-on: ubuntu-22.04
+    name: bullseye-aarch64 sysroot
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v2
+
+      - name: Create sysroot
+        run: ./sysroot/sysroot-creator.sh build arm64
+
+      - name: Upload sysroot
+        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+        uses: svenstaro/upload-release-action@v1-release
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: "sysroot/out/sysroot-build/bullseye/debian_bullseye_arm64_sysroot.tar.xz"
+          tag: ${{ github.ref }}
+          asset_name: debian_bullseye_aarch64_sysroot.tar.xz
+          overwrite: true
diff --git a/sysroot/generated_package_lists/bullseye.arm64 b/sysroot/generated_package_lists/bullseye.arm64
new file mode 100644
index 0000000..ebe6feb
--- /dev/null
+++ b/sysroot/generated_package_lists/bullseye.arm64
@@ -0,0 +1,8 @@
+https://snapshot.debian.org/archive/debian/20230329T085712Z/pool/main/g/gcc-10/libgcc-10-dev_10.2.1-6_arm64.deb
+https://snapshot.debian.org/archive/debian/20230329T085712Z/pool/main/g/gcc-10/libgcc-s1_10.2.1-6_arm64.deb
+https://snapshot.debian.org/archive/debian/20230329T085712Z/pool/main/g/gcc-10/libstdc++-10-dev_10.2.1-6_arm64.deb
+https://snapshot.debian.org/archive/debian/20230329T085712Z/pool/main/g/gcc-10/libstdc++6_10.2.1-6_arm64.deb
+https://snapshot.debian.org/archive/debian/20230329T085712Z/pool/main/g/glibc/libc6_2.31-13+deb11u5_arm64.deb
+https://snapshot.debian.org/archive/debian/20230329T085712Z/pool/main/g/glibc/libc6-dev_2.31-13+deb11u5_arm64.deb
+https://snapshot.debian.org/archive/debian/20230329T085712Z/pool/main/l/linux/linux-libc-dev_6.1.12-1~bpo11+1_arm64.deb
+https://snapshot.debian.org/archive/debian/20230329T085712Z/pool/main/u/util-linux/uuid-dev_2.36.1-8+deb11u1_arm64.deb
diff --git a/sysroot/keyring.gpg b/sysroot/keyring.gpg
new file mode 100644
index 0000000..81e2624
Binary files /dev/null and b/sysroot/keyring.gpg differ
diff --git a/sysroot/merge-package-lists.py b/sysroot/merge-package-lists.py
new file mode 100755
index 0000000..e2a5a63
--- /dev/null
+++ b/sysroot/merge-package-lists.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+# Copyright 2016 The Chromium Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Merge package entries from different package lists.
+"""
+
+# This is used for replacing packages in eg. bullseye with those in bookworm.
+# The updated packages are ABI compatible, but include security patches, so we
+# should use those instead in our sysroots.
+
+import sys
+
+if len(sys.argv) != 2:
+  exit(1)
+
+packages = {}
+
+def AddPackagesFromFile(file):
+  global packages
+  lines = file.readlines()
+  if len(lines) % 3 != 0:
+    exit(1)
+  for i in range(0, len(lines), 3):
+    packages[lines[i]] = (lines[i + 1], lines[i + 2])
+
+AddPackagesFromFile(open(sys.argv[1], 'r'))
+AddPackagesFromFile(sys.stdin)
+
+output_file = open(sys.argv[1], 'w')
+
+for (package, (filename, sha256)) in packages.items():
+  output_file.write(package + filename + sha256)
diff --git a/sysroot/sysroot-creator.sh b/sysroot/sysroot-creator.sh
new file mode 100755
index 0000000..60af2b5
--- /dev/null
+++ b/sysroot/sysroot-creator.sh
@@ -0,0 +1,623 @@
+#!/bin/bash
+
+# Copyright 2014 The Chromium Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+#@ This script builds Debian sysroot images for building Google Chrome.
+#@
+#@  Usage:
+#@    sysroot-creator.sh {build,upload} \
+#@    {amd64,i386,armhf,arm64,armel,mipsel,mips64el}
+#@
+
+######################################################################
+# Config
+######################################################################
+
+set -o nounset
+set -o errexit
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+DISTRO=debian
+RELEASE=bullseye
+
+# This number is appended to the sysroot key to cause full rebuilds.  It
+# should be incremented when removing packages or patching existing packages.
+# It should not be incremented when adding packages.
+SYSROOT_RELEASE=1
+
+ARCHIVE_TIMESTAMP=20230329T085712Z
+
+ARCHIVE_URL="https://snapshot.debian.org/archive/debian/$ARCHIVE_TIMESTAMP/"
+APT_SOURCES_LIST=(
+  # Debian 12 (Bookworm) is needed for GTK4.  It should be kept before bullseye
+  # so that bullseye takes precedence.
+  "${ARCHIVE_URL} bookworm main"
+  "${ARCHIVE_URL} bookworm-updates main"
+
+  # Debian 9 (Stretch) is needed for gnome-keyring.  It should be kept before
+  # bullseye so that bullseye takes precedence.
+  "${ARCHIVE_URL} stretch main"
+  "${ARCHIVE_URL} stretch-updates main"
+
+  # This mimics a sources.list from bullseye.
+  "${ARCHIVE_URL} bullseye main contrib non-free"
+  "${ARCHIVE_URL} bullseye-updates main contrib non-free"
+  "${ARCHIVE_URL} bullseye-backports main contrib non-free"
+)
+
+# gpg keyring file generated using generate_keyring.sh
+KEYRING_FILE="${SCRIPT_DIR}/keyring.gpg"
+
+# Sysroot packages: these are the packages needed to build chrome.
+DEBIAN_PACKAGES="\
+  libc6
+  libc6-dev
+  libstdc++-10-dev
+  libstdc++6
+  linux-libc-dev
+  uuid-dev
+  libgcc-10-dev
+  libgcc-s1
+"
+
+DEBIAN_PACKAGES_AMD64="
+  libasan6
+  libdrm-intel1
+  libitm1
+  liblsan0
+  libquadmath0
+  libtsan0
+  libubsan1
+  valgrind
+"
+
+DEBIAN_PACKAGES_I386="
+  libasan6
+  libdrm-intel1
+  libitm1
+  libquadmath0
+  libubsan1
+  valgrind
+"
+
+DEBIAN_PACKAGES_ARMHF="
+  libasan6
+  libdrm-etnaviv1
+  libdrm-exynos1
+  libdrm-freedreno1
+  libdrm-omap1
+  libdrm-tegra0
+  libubsan1
+  valgrind
+"
+
+DEBIAN_PACKAGES_ARM64="
+"
+
+DEBIAN_PACKAGES_ARMEL="
+  libasan6
+  libdrm-exynos1
+  libdrm-freedreno1
+  libdrm-omap1
+  libdrm-tegra0
+  libubsan1
+"
+
+DEBIAN_PACKAGES_MIPSEL="
+"
+
+DEBIAN_PACKAGES_MIPS64EL="
+  valgrind
+"
+
+readonly REQUIRED_TOOLS="curl xzcat"
+
+######################################################################
+# Package Config
+######################################################################
+
+readonly PACKAGES_EXT=xz
+readonly RELEASE_FILE="Release"
+readonly RELEASE_FILE_GPG="Release.gpg"
+
+######################################################################
+# Helper
+######################################################################
+
+Banner() {
+  echo "######################################################################"
+  echo $*
+  echo "######################################################################"
+}
+
+
+SubBanner() {
+  echo "----------------------------------------------------------------------"
+  echo $*
+  echo "----------------------------------------------------------------------"
+}
+
+
+Usage() {
+  egrep "^#@" "${BASH_SOURCE[0]}" | cut --bytes=3-
+}
+
+
+DownloadOrCopyNonUniqueFilename() {
+  # Use this function instead of DownloadOrCopy when the url uniquely
+  # identifies the file, but the filename (excluding the directory)
+  # does not.
+  local url="$1"
+  local dest="$2"
+
+  local hash="$(echo "$url" | sha256sum | cut -d' ' -f1)"
+
+  DownloadOrCopy "${url}" "${dest}.${hash}"
+  # cp the file to prevent having to redownload it, but mv it to the
+  # final location so that it's atomic.
+  cp "${dest}.${hash}" "${dest}.$$"
+  mv "${dest}.$$" "${dest}"
+}
+
+DownloadOrCopy() {
+  if [ -f "$2" ] ; then
+    echo "$2 already in place"
+    return
+  fi
+
+  HTTP=0
+  echo "$1" | grep -Eqs '^https?://' && HTTP=1
+  if [ "$HTTP" = "1" ]; then
+    SubBanner "downloading from $1 -> $2"
+    # Appending the "$$" shell pid is necessary here to prevent concurrent
+    # instances of sysroot-creator.sh from trying to write to the same file.
+    local temp_file="${2}.partial.$$"
+    # curl --retry doesn't retry when the page gives a 4XX error, so we need to
+    # manually rerun.
+    for i in {1..10}; do
+      # --create-dirs is added in case there are slashes in the filename, as can
+      # happen with the "debian/security" release class.
+      local http_code=$(curl -L "$1" --create-dirs -o "${temp_file}" \
+                        -w "%{http_code}")
+      if [ ${http_code} -eq 200 ]; then
+        break
+      fi
+      echo "Bad HTTP code ${http_code} when downloading $1"
+      rm -f "${temp_file}"
+      sleep $i
+    done
+    if [ ! -f "${temp_file}" ]; then
+      exit 1
+    fi
+    mv "${temp_file}" $2
+  else
+    SubBanner "copying from $1"
+    cp "$1" "$2"
+  fi
+}
+
+SetEnvironmentVariables() {
+  case $ARCH in
+    amd64)
+      TRIPLE=x86_64-linux-gnu
+      DEBIAN_PACKAGES_ARCH="${DEBIAN_PACKAGES_AMD64}"
+      ;;
+    i386)
+      TRIPLE=i386-linux-gnu
+      DEBIAN_PACKAGES_ARCH="${DEBIAN_PACKAGES_I386}"
+      ;;
+    armhf)
+      TRIPLE=arm-linux-gnueabihf
+      DEBIAN_PACKAGES_ARCH="${DEBIAN_PACKAGES_ARMHF}"
+      ;;
+    arm64)
+      TRIPLE=aarch64-linux-gnu
+      DEBIAN_PACKAGES_ARCH="${DEBIAN_PACKAGES_ARM64}"
+      ;;
+    armel)
+      TRIPLE=arm-linux-gnueabi
+      DEBIAN_PACKAGES_ARCH="${DEBIAN_PACKAGES_ARMEL}"
+      ;;
+    mipsel)
+      TRIPLE=mipsel-linux-gnu
+      DEBIAN_PACKAGES_ARCH="${DEBIAN_PACKAGES_MIPSEL}"
+      ;;
+    mips64el)
+      TRIPLE=mips64el-linux-gnuabi64
+      DEBIAN_PACKAGES_ARCH="${DEBIAN_PACKAGES_MIPS64EL}"
+      ;;
+    *)
+      echo "ERROR: Unsupported architecture: $ARCH"
+      Usage
+      exit 1
+      ;;
+  esac
+}
+
+# some sanity checks to make sure this script is run from the right place
+# with the right tools
+SanityCheck() {
+  Banner "Sanity Checks"
+
+  local chrome_dir=.
+  BUILD_DIR="${chrome_dir}/out/sysroot-build/${RELEASE}"
+  mkdir -p ${BUILD_DIR}
+  echo "Using build directory: ${BUILD_DIR}"
+
+  for tool in ${REQUIRED_TOOLS} ; do
+    if ! which ${tool} > /dev/null ; then
+      echo "Required binary $tool not found."
+      echo "Exiting."
+      exit 1
+    fi
+  done
+
+  # This is where the staging sysroot is.
+  INSTALL_ROOT="${BUILD_DIR}/${RELEASE}_${ARCH}_staging"
+  TARBALL="${BUILD_DIR}/${DISTRO}_${RELEASE}_${ARCH}_sysroot.tar.xz"
+
+  if ! mkdir -p "${INSTALL_ROOT}" ; then
+    echo "ERROR: ${INSTALL_ROOT} can't be created."
+    exit 1
+  fi
+}
+
+
+ChangeDirectory() {
+  # Change directory to where this script is.
+  cd ${SCRIPT_DIR}
+}
+
+
+ClearInstallDir() {
+  Banner "Clearing dirs in ${INSTALL_ROOT}"
+  rm -rf ${INSTALL_ROOT}/*
+}
+
+
+CreateTarBall() {
+  Banner "Creating tarball ${TARBALL}"
+  tar -I "xz -9 -T0" -cf ${TARBALL} -C ${INSTALL_ROOT} .
+}
+
+ExtractPackageXz() {
+  local src_file="$1"
+  local dst_file="$2"
+  local repo="$3"
+  xzcat "${src_file}" | egrep '^(Package:|Filename:|SHA256:) ' |
+    sed "s|Filename: |Filename: ${repo}|" > "${dst_file}"
+}
+
+GeneratePackageListDistRepo() {
+  local arch="$1"
+  local repo="$2"
+  local dist="$3"
+  local repo_name="$4"
+
+  local tmp_package_list="${BUILD_DIR}/Packages.${dist}_${repo_name}_${arch}"
+  local repo_basedir="${repo}/dists/${dist}"
+  local package_list="${BUILD_DIR}/Packages.${dist}_${repo_name}_${arch}.${PACKAGES_EXT}"
+  local package_file_arch="${repo_name}/binary-${arch}/Packages.${PACKAGES_EXT}"
+  local package_list_arch="${repo_basedir}/${package_file_arch}"
+
+  DownloadOrCopyNonUniqueFilename "${package_list_arch}" "${package_list}"
+  VerifyPackageListing "${package_file_arch}" "${package_list}" ${repo} ${dist}
+  ExtractPackageXz "${package_list}" "${tmp_package_list}" ${repo}
+  cat "${tmp_package_list}" | ./merge-package-lists.py "${list_base}"
+}
+
+GeneratePackageListDist() {
+  local arch="$1"
+  set -- $2
+  local repo="$1"
+  local dist="$2"
+  shift 2
+  while (( "$#" )); do
+    GeneratePackageListDistRepo "$arch" "$repo" "$dist" "$1"
+    shift
+  done
+}
+
+GeneratePackageList() {
+  local output_file="$1"
+  local arch="$2"
+  local packages="$3"
+
+  local list_base="${BUILD_DIR}/Packages.${RELEASE}_${arch}"
+  > "${list_base}"  # Create (or truncate) a zero-length file.
+  printf '%s\n' "${APT_SOURCES_LIST[@]}" | while read source; do
+    GeneratePackageListDist "${arch}" "${source}"
+  done
+
+  GeneratePackageListImpl "${list_base}" "${output_file}" \
+    "${DEBIAN_PACKAGES} ${packages}"
+}
+
+StripChecksumsFromPackageList() {
+  local package_file="$1"
+  sed -i 's/ [a-f0-9]\{64\}$//' "$package_file"
+}
+
+######################################################################
+#
+######################################################################
+
+HacksAndPatches() {
+  Banner "Misc Hacks & Patches"
+
+  # Remove an unnecessary dependency on qtchooser.
+  # rm "${INSTALL_ROOT}/usr/lib/${TRIPLE}/qt-default/qtchooser/default.conf"
+
+  # libxcomposite1 is missing a symbols file.
+  # cp "${SCRIPT_DIR}/libxcomposite1-symbols" \
+  #   "${INSTALL_ROOT}/debian/libxcomposite1/DEBIAN/symbols"
+
+  # __GLIBC_MINOR__ is used as a feature test macro.  Replace it with the
+  # earliest supported version of glibc (2.26, obtained from the oldest glibc
+  # version in //chrome/installer/linux/debian/dist_packag_versions.json and
+  # //chrome/installer/linux/rpm/dist_package_provides.json).
+  local usr_include="${INSTALL_ROOT}/usr/include"
+  # local features_h="${usr_include}/features.h"
+  # sed -i 's|\(#define\s\+__GLIBC_MINOR__\)|\1 26 //|' "${features_h}"
+
+  # fcntl64() was introduced in glibc 2.28.  Make sure to use fcntl() instead.
+  # local fcntl_h="${INSTALL_ROOT}/usr/include/fcntl.h"
+  # sed -i '{N; s/#ifndef __USE_FILE_OFFSET64\(\nextern int fcntl\)/#if 1\1/}' \
+  #     "${fcntl_h}"
+
+  # Do not use pthread_cond_clockwait as it was introduced in glibc 2.30.
+  local cppconfig_h="${usr_include}/${TRIPLE}/c++/10/bits/c++config.h"
+  sed -i 's|\(#define\s\+_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT\)|// \1|' \
+    "${cppconfig_h}"
+
+  # This is for chrome's ./build/linux/pkg-config-wrapper
+  # which overwrites PKG_CONFIG_LIBDIR internally
+  SubBanner "Move pkgconfig scripts"
+  mkdir -p ${INSTALL_ROOT}/usr/lib/pkgconfig
+  mv ${INSTALL_ROOT}/usr/lib/${TRIPLE}/pkgconfig/* \
+      ${INSTALL_ROOT}/usr/lib/pkgconfig
+
+  # Avoid requiring unsupported glibc versions.
+  "${SCRIPT_DIR}/reversion_glibc.py" \
+    "${INSTALL_ROOT}/lib/${TRIPLE}/libc.so.6"
+  "${SCRIPT_DIR}/reversion_glibc.py" \
+    "${INSTALL_ROOT}/lib/${TRIPLE}/libm.so.6"
+  # "${SCRIPT_DIR}/reversion_glibc.py" \
+  #   "${INSTALL_ROOT}/lib/${TRIPLE}/libcrypt.so.1"
+}
+
+InstallIntoSysroot() {
+  Banner "Install Libs And Headers Into Jail"
+
+  mkdir -p ${BUILD_DIR}/debian-packages
+  # The /debian directory is an implementation detail that's used to cd into
+  # when running dpkg-shlibdeps.
+  mkdir -p ${INSTALL_ROOT}/debian
+  # An empty control file is necessary to run dpkg-shlibdeps.
+  touch ${INSTALL_ROOT}/debian/control
+  while (( "$#" )); do
+    local file="$1"
+    local package="${BUILD_DIR}/debian-packages/${file##*/}"
+    shift
+    local sha256sum="$1"
+    shift
+    if [ "${#sha256sum}" -ne "64" ]; then
+      echo "Bad sha256sum from package list"
+      exit 1
+    fi
+
+    Banner "Installing $(basename ${file})"
+    DownloadOrCopy ${file} ${package}
+    if [ ! -s "${package}" ] ; then
+      echo
+      echo "ERROR: bad package ${package}"
+      exit 1
+    fi
+    echo "${sha256sum}  ${package}" | sha256sum --quiet -c
+
+    SubBanner "Extracting to ${INSTALL_ROOT}"
+    dpkg-deb -x ${package} ${INSTALL_ROOT}
+
+    base_package=$(dpkg-deb --field ${package} Package)
+    mkdir -p ${INSTALL_ROOT}/debian/${base_package}/DEBIAN
+    dpkg-deb -e ${package} ${INSTALL_ROOT}/debian/${base_package}/DEBIAN
+  done
+
+  # Prune /usr/share, leaving only pkgconfig, wayland, and wayland-protocols.
+  ls -d ${INSTALL_ROOT}/usr/share/* | \
+    grep -v "/\(pkgconfig\|wayland\|wayland-protocols\)$" | xargs rm -r
+}
+
+
+CleanupJailSymlinks() {
+  Banner "Jail symlink cleanup"
+
+  SAVEDPWD=$(pwd)
+  cd ${INSTALL_ROOT}
+  local libdirs="lib usr/lib"
+  if [ -d lib64 ]; then
+    libdirs="${libdirs} lib64"
+  fi
+
+  find $libdirs -type l -printf '%p %l\n' | while read link target; do
+    # skip links with non-absolute paths
+    echo "${target}" | grep -qs ^/ || continue
+    echo "${link}: ${target}"
+    # Relativize the symlink.
+    prefix=$(echo "${link}" | sed -e 's/[^/]//g' | sed -e 's|/|../|g')
+    ln -snfv "${prefix}${target}" "${link}"
+  done
+
+  failed=0
+  while read link target; do
+    # Make sure we catch new bad links.
+    if [ ! -r "${link}" ]; then
+      echo "ERROR: FOUND BAD LINK ${link}"
+      ls -l ${link}
+      failed=1
+    fi
+  done < <(find $libdirs -type l -printf '%p %l\n')
+  if [ $failed -eq 1 ]; then
+      exit 1
+  fi
+  cd "$SAVEDPWD"
+}
+
+
+VerifyLibraryDeps() {
+  local find_dirs=(
+    "${INSTALL_ROOT}/lib/"
+    "${INSTALL_ROOT}/lib/${TRIPLE}/"
+    "${INSTALL_ROOT}/usr/lib/${TRIPLE}/"
+  )
+  local needed_libs="$(
+    find ${find_dirs[*]} -name "*\.so*" -type f -exec file {} \; | \
+      grep ': ELF' | sed 's/^\(.*\): .*$/\1/' | xargs readelf -d | \
+      grep NEEDED | sort | uniq | sed 's/^.*Shared library: \[\(.*\)\]$/\1/g')"
+  local all_libs="$(find ${find_dirs[*]} -printf '%f\n')"
+  # Ignore missing libdbus-1.so.0
+  all_libs+="$(echo -e '\nlibdbus-1.so.0')"
+  local missing_libs="$(grep -vFxf <(echo "${all_libs}") \
+    <(echo "${needed_libs}"))"
+  if [ ! -z "${missing_libs}" ]; then
+    echo "Missing libraries:"
+    echo "${missing_libs}"
+    exit 1
+  fi
+}
+
+BuildSysroot() {
+  ClearInstallDir
+  local package_file="generated_package_lists/${RELEASE}.${ARCH}"
+  GeneratePackageList "${package_file}" $ARCH "${DEBIAN_PACKAGES_ARCH}"
+  local files_and_sha256sums="$(cat ${package_file})"
+  StripChecksumsFromPackageList "$package_file"
+  InstallIntoSysroot ${files_and_sha256sums}
+  # HacksAndPatches
+  # CleanupJailSymlinks
+  # VerifyLibraryDeps
+  CreateTarBall
+}
+
+UploadSysroot() {
+  local sha=$(sha1sum "${TARBALL}" | awk '{print $1;}')
+  set -x
+  gsutil.py cp -a public-read "${TARBALL}" \
+      "gs://chrome-linux-sysroot/toolchain/$sha/"
+  set +x
+}
+
+#
+# CheckForDebianGPGKeyring
+#
+#     Make sure the Debian GPG keys exist. Otherwise print a helpful message.
+#
+CheckForDebianGPGKeyring() {
+  if [ ! -e "$KEYRING_FILE" ]; then
+    echo "KEYRING_FILE not found: ${KEYRING_FILE}"
+    echo "Debian GPG keys missing. Install the debian-archive-keyring package."
+    exit 1
+  fi
+}
+
+#
+# VerifyPackageListing
+#
+#     Verifies the downloaded Packages.xz file has the right checksums.
+#
+VerifyPackageListing() {
+  local file_path="$1"
+  local output_file="$2"
+  local repo="$3"
+  local dist="$4"
+
+  local repo_basedir="${repo}/dists/${dist}"
+  local release_list="${repo_basedir}/${RELEASE_FILE}"
+  local release_list_gpg="${repo_basedir}/${RELEASE_FILE_GPG}"
+
+  local release_file="${BUILD_DIR}/${dist}-${RELEASE_FILE}"
+  local release_file_gpg="${BUILD_DIR}/${dist}-${RELEASE_FILE_GPG}"
+
+  CheckForDebianGPGKeyring
+
+  DownloadOrCopyNonUniqueFilename ${release_list} ${release_file}
+  DownloadOrCopyNonUniqueFilename ${release_list_gpg} ${release_file_gpg}
+  echo "Verifying: ${release_file} with ${release_file_gpg}"
+  set -x
+  gpgv --keyring "${KEYRING_FILE}" "${release_file_gpg}" "${release_file}"
+  set +x
+
+  echo "Verifying: ${output_file}"
+  local sha256sum=$(grep -E "${file_path}\$|:\$" "${release_file}" | \
+    grep "SHA256:" -A 1 | xargs echo | awk '{print $2;}')
+
+  if [ "${#sha256sum}" -ne "64" ]; then
+    echo "Bad sha256sum from ${release_list}"
+    exit 1
+  fi
+
+  echo "${sha256sum}  ${output_file}" | sha256sum --quiet -c
+}
+
+#
+# GeneratePackageListImpl
+#
+#     Looks up package names in ${BUILD_DIR}/Packages and write list of URLs
+#     to output file.
+#
+GeneratePackageListImpl() {
+  local input_file="$1"
+  local output_file="$2"
+  echo "Updating: ${output_file} from ${input_file}"
+  /bin/rm -f "${output_file}"
+  shift
+  shift
+  local failed=0
+  for pkg in $@ ; do
+    local pkg_full=$(grep -A 1 " ${pkg}\$" "$input_file" | \
+      egrep "pool/.*" | sed 's/.*Filename: //')
+    if [ -z "${pkg_full}" ]; then
+      echo "ERROR: missing package: $pkg"
+      local failed=1
+    else
+      local sha256sum=$(grep -A 4 " ${pkg}\$" "$input_file" | \
+        grep ^SHA256: | sed 's/^SHA256: //')
+      if [ "${#sha256sum}" -ne "64" ]; then
+        echo "Bad sha256sum from Packages"
+        local failed=1
+      fi
+      echo $pkg_full $sha256sum >> "$output_file"
+    fi
+  done
+  if [ $failed -eq 1 ]; then
+    exit 1
+  fi
+  # sort -o does an in-place sort of this file
+  sort "$output_file" -o "$output_file"
+}
+
+if [ $# -ne 2 ]; then
+  Usage
+  exit 1
+else
+  ChangeDirectory
+  ARCH=$2
+  SetEnvironmentVariables
+  SanityCheck
+  case "$1" in
+    build)
+      BuildSysroot
+      ;;
+    upload)
+      UploadSysroot
+      ;;
+    *)
+      echo "ERROR: Invalid command: $1"
+      Usage
+      exit 1
+      ;;
+  esac
+fi