#!/bin/bash -e

# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Script to install everything needed to build chromium (well, ideally, anyway)
# See https://chromium.googlesource.com/chromium/src/+/master/docs/linux_build_instructions.md

usage() {
  echo "Usage: $0 [--options]"
  echo "Options:"
  echo "--[no-]syms: enable or disable installation of debugging symbols"
  echo "--lib32: enable installation of 32-bit libraries, e.g. for V8 snapshot"
  echo "--[no-]arm: enable or disable installation of arm cross toolchain"
  echo "--[no-]chromeos-fonts: enable or disable installation of Chrome OS"\
       "fonts"
  echo "--[no-]nacl: enable or disable installation of prerequisites for"\
       "building standalone NaCl and all its toolchains"
  echo "--no-prompt: silently select standard options/defaults"
  echo "--quick-check: quickly try to determine if dependencies are installed"
  echo "               (this avoids interactive prompts and sudo commands,"
  echo "               so might not be 100% accurate)"
  echo "--unsupported: attempt installation even on unsupported systems"
  echo "Script will prompt interactively if options not given."
  exit 1
}

# Waits for the user to press 'Y' or 'N'. Either uppercase of lowercase is
# accepted. Returns 0 for 'Y' and 1 for 'N'. If an optional parameter has
# been provided to yes_no(), the function also accepts RETURN as a user input.
# The parameter specifies the exit code that should be returned in that case.
# The function will echo the user's selection followed by a newline character.
# Users can abort the function by pressing CTRL-C. This will call "exit 1".
yes_no() {
  if [ 0 -ne "${do_default-0}" ] ; then
    [ $1 -eq 0 ] && echo "Y" || echo "N"
    return $1
  fi
  local c
  while :; do
    c="$(trap 'stty echo -iuclc icanon 2>/dev/null' EXIT INT TERM QUIT
         stty -echo iuclc -icanon 2>/dev/null
         dd count=1 bs=1 2>/dev/null | od -An -tx1)"
    case "$c" in
      " 0a") if [ -n "$1" ]; then
               [ $1 -eq 0 ] && echo "Y" || echo "N"
               return $1
             fi
             ;;
      " 79") echo "Y"
             return 0
             ;;
      " 6e") echo "N"
             return 1
             ;;
      "")    echo "Aborted" >&2
             exit 1
             ;;
      *)     # The user pressed an unrecognized key. As we are not echoing
             # any incorrect user input, alert the user by ringing the bell.
             (tput bel) 2>/dev/null
             ;;
    esac
  done
}

# Checks whether a particular package is available in the repos.
# USAGE: $ package_exists <package name>
package_exists() {
  # 'apt-cache search' takes a regex string, so eg. the +'s in packages like
  # "libstdc++" need to be escaped.
  local escaped="$(echo $1 | sed 's/[\~\+\.\:-]/\\&/g')"
  [ ! -z "$(apt-cache search --names-only "${escaped}" | \
            awk '$1 == "'$1'" { print $1; }')" ]
}

# These default to on because (some) bots need them and it keeps things
# simple for the bot setup if all bots just run the script in its default
# mode.  Developers who don't want stuff they don't need installed on their
# own workstations can pass --no-arm --no-nacl when running the script.
do_inst_arm=1
do_inst_nacl=1

while test "$1" != ""
do
  case "$1" in
  --syms)                   do_inst_syms=1;;
  --no-syms)                do_inst_syms=0;;
  --lib32)                  do_inst_lib32=1;;
  --arm)                    do_inst_arm=1;;
  --no-arm)                 do_inst_arm=0;;
  --chromeos-fonts)         do_inst_chromeos_fonts=1;;
  --no-chromeos-fonts)      do_inst_chromeos_fonts=0;;
  --nacl)                   do_inst_nacl=1;;
  --no-nacl)                do_inst_nacl=0;;
  --no-prompt)              do_default=1
                            do_quietly="-qq --assume-yes"
    ;;
  --quick-check)            do_quick_check=1;;
  --unsupported)            do_unsupported=1;;
  *) usage;;
  esac
  shift
done

if test "$do_inst_arm" = "1"; then
  do_inst_lib32=1
fi

# Check for lsb_release command in $PATH
if ! which lsb_release > /dev/null; then
  echo "ERROR: lsb_release not found in \$PATH" >&2
  exit 1;
fi

distro_codename=$(lsb_release --codename --short)
distro_id=$(lsb_release --id --short)
supported_codenames="(trusty|xenial|artful|bionic)"
supported_ids="(Debian)"
if [ 0 -eq "${do_unsupported-0}" ] && [ 0 -eq "${do_quick_check-0}" ] ; then
  if [[ ! $distro_codename =~ $supported_codenames &&
        ! $distro_id =~ $supported_ids ]]; then
    echo -e "ERROR: The only supported distros are\n" \
      "\tUbuntu 14.04 LTS (trusty)\n" \
      "\tUbuntu 16.04 LTS (xenial)\n" \
      "\tUbuntu 17.10 (artful)\n" \
      "\tUbuntu 18.04 LTS (bionic)\n" \
      "\tDebian 8 (jessie) or later" >&2
    exit 1
  fi

  if ! uname -m | egrep -q "i686|x86_64"; then
    echo "Only x86 architectures are currently supported" >&2
    exit
  fi
fi

if [ "x$(id -u)" != x0 ] && [ 0 -eq "${do_quick_check-0}" ]; then
  echo "Running as non-root user."
  echo "You might have to enter your password one or more times for 'sudo'."
  echo
fi

# Packages needed for chromeos only
chromeos_dev_list="libbluetooth-dev libxkbcommon-dev"

if package_exists realpath; then
  chromeos_dev_list="${chromeos_dev_list} realpath"
fi

# Packages needed for development
dev_list="\
  bison
  bzip2
  cdbs
  curl
  dbus-x11
  dpkg-dev
  elfutils
  devscripts
  fakeroot
  flex
  g++
  git-core
  git-svn
  gperf
  libappindicator-dev
  libappindicator3-dev
  libasound2-dev
  libbrlapi-dev
  libbz2-dev
  libcairo2-dev
  libcap-dev
  libcups2-dev
  libcurl4-gnutls-dev
  libdrm-dev
  libelf-dev
  libffi-dev
  libgbm-dev
  libglib2.0-dev
  libglu1-mesa-dev
  libgnome-keyring-dev
  libgtk2.0-dev
  libgtk-3-dev
  libkrb5-dev
  libnspr4-dev
  libnss3-dev
  libpam0g-dev
  libpci-dev
  libpulse-dev
  libsctp-dev
  libspeechd-dev
  libsqlite3-dev
  libssl-dev
  libudev-dev
  libwww-perl
  libxslt1-dev
  libxss-dev
  libxt-dev
  libxtst-dev
  locales
  openbox
  p7zip
  patch
  perl
  pkg-config
  python
  python-cherrypy3
  python-crypto
  python-dev
  python-numpy
  python-opencv
  python-openssl
  python-psutil
  python-yaml
  rpm
  ruby
  subversion
  wdiff
  x11-utils
  xcompmgr
  xz-utils
  zip
  $chromeos_dev_list
"

# 64-bit systems need a minimum set of 32-bit compat packages for the pre-built
# NaCl binaries.
if file -L /sbin/init | grep -q 'ELF 64-bit'; then
  dev_list="${dev_list} libc6-i386 lib32gcc1 lib32stdc++6"
fi

# Run-time libraries required by chromeos only
chromeos_lib_list="libpulse0 libbz2-1.0"

# Full list of required run-time libraries
lib_list="\
  libappindicator1
  libappindicator3-1
  libasound2
  libatk1.0-0
  libc6
  libcairo2
  libcap2
  libcups2
  libexpat1
  libffi6
  libfontconfig1
  libfreetype6
  libglib2.0-0
  libgnome-keyring0
  libgtk2.0-0
  libgtk-3-0
  libpam0g
  libpango1.0-0
  libpci3
  libpcre3
  libpixman-1-0
  libspeechd2
  libstdc++6
  libsqlite3-0
  libwayland-egl1-mesa
  libx11-6
  libx11-xcb1
  libxau6
  libxcb1
  libxcomposite1
  libxcursor1
  libxdamage1
  libxdmcp6
  libxext6
  libxfixes3
  libxi6
  libxinerama1
  libxrandr2
  libxrender1
  libxtst6
  zlib1g
  $chromeos_lib_list
"

# Debugging symbols for all of the run-time libraries
dbg_list="\
  libc6-dbg
  libffi6-dbg
  libgtk2.0-0-dbg
  libpcre3-dbg
  libxau6-dbg
  libxcb1-dbg
  libxcomposite1-dbg
  libxdmcp6-dbg
  libxext6-dbg
  libxinerama1-dbg
  zlib1g-dbg
"

if package_exists libstdc++6-6-dbg; then
  dbg_list="${dbg_list} libstdc++6-6-dbg"
elif package_exists libstdc++6-4.9-dbg; then
  dbg_list="${dbg_list} libstdc++6-4.9-dbg"
else
  dbg_list="${dbg_list} libstdc++6-4.8-dbg"
fi
if package_exists libgtk-3-0-dbgsym; then
  dbg_list="${dbg_list} libgtk-3-0-dbgsym"
elif package_exists libgtk-3-0-dbg; then
  dbg_list="${dbg_list} libgtk-3-0-dbg"
fi
if package_exists libatk1.0-0-dbgsym; then
  dbg_list="${dbg_list} libatk1.0-0-dbgsym"
elif package_exists libatk1.0-dbg; then
  dbg_list="${dbg_list} libatk1.0-dbg"
fi
if package_exists libcairo2-dbgsym; then
  dbg_list="${dbg_list} libcairo2-dbgsym"
elif package_exists libcairo2-dbg; then
  dbg_list="${dbg_list} libcairo2-dbg"
fi
if package_exists libfontconfig1-dbgsym; then
  dbg_list="${dbg_list} libfontconfig1-dbgsym"
else
  dbg_list="${dbg_list} libfontconfig1-dbg"
fi
if package_exists libxdamage1-dbgsym; then
  dbg_list="${dbg_list} libxdamage1-dbgsym"
elif package_exists libxdamage1-dbg; then
  dbg_list="${dbg_list} libxdamage1-dbg"
fi
if package_exists libpango1.0-dev-dbgsym; then
  dbg_list="${dbg_list} libpango1.0-dev-dbgsym"
elif package_exists libpango1.0-0-dbg; then
  dbg_list="${dbg_list} libpango1.0-0-dbg"
fi
if package_exists libx11-6-dbg; then
  dbg_list="${dbg_list} libx11-6-dbg"
fi
if package_exists libx11-xcb1-dbg; then
  dbg_list="${dbg_list} libx11-xcb1-dbg"
fi
if package_exists libxfixes3-dbg; then
  dbg_list="${dbg_list} libxfixes3-dbg"
fi
if package_exists libxi6-dbg; then
  dbg_list="${dbg_list} libxi6-dbg"
fi
if package_exists libxrandr2-dbg; then
  dbg_list="${dbg_list} libxrandr2-dbg"
fi
if package_exists libxrender1-dbg; then
  dbg_list="${dbg_list} libxrender1-dbg"
fi
if package_exists libxtst6-dbg; then
  dbg_list="${dbg_list} libxtst6-dbg"
fi
if package_exists libglib2.0-0-dbgsym; then
  dbg_list="${dbg_list} libglib2.0-0-dbgsym"
elif package_exists libglib2.0-0-dbg; then
  dbg_list="${dbg_list} libglib2.0-0-dbg"
fi
if package_exists libxcursor1-dbgsym; then
  dbg_list="${dbg_list} libxcursor1-dbgsym"
elif package_exists libxcursor1-dbg; then
  dbg_list="${dbg_list} libxcursor1-dbg"
fi
if package_exists libsqlite3-0-dbgsym; then
  dbg_list="${dbg_list} libsqlite3-0-dbgsym"
else
  dbg_list="${dbg_list} libsqlite3-0-dbg"
fi
if package_exists libpixman-1-0-dbgsym; then
  dbg_list="${dbg_list} libpixman-1-0-dbgsym"
else
  dbg_list="${dbg_list} libpixman-1-0-dbg"
fi

# 32-bit libraries needed e.g. to compile V8 snapshot for Android or armhf
lib32_list="linux-libc-dev:i386 libpci3:i386"

# 32-bit libraries needed for a 32-bit build
lib32_list="$lib32_list libx11-xcb1:i386"

# arm cross toolchain packages needed to build chrome on armhf
EM_REPO="deb http://emdebian.org/tools/debian/ jessie main"
EM_SOURCE=$(cat <<EOF
# Repo added by Chromium $0
${EM_REPO}
# deb-src http://emdebian.org/tools/debian/ jessie main
EOF
)
EM_ARCHIVE_KEY_FINGER="084C6C6F39159EDB67969AA87DE089671804772E"
GPP_ARM_PACKAGE="g++-arm-linux-gnueabihf"
case $distro_codename in
  jessie)
    eval $(apt-config shell APT_SOURCESDIR 'Dir::Etc::sourceparts/d')
    CROSSTOOLS_LIST="${APT_SOURCESDIR}/crosstools.list"
    arm_list="libc6-dev:armhf
              linux-libc-dev:armhf"
    if test "$do_inst_arm" = "1"; then
      if $(dpkg-query -W ${GPP_ARM_PACKAGE} &>/dev/null); then
        arm_list+=" ${GPP_ARM_PACKAGE}"
      else
        echo "The Debian Cross-toolchains repository is necessary to"
        echo "cross-compile Chromium for arm."
        echo -n "Do you want me to add it for you (y/N) "
        if yes_no 1; then
          gpg --keyserver pgp.mit.edu --recv-keys ${EM_ARCHIVE_KEY_FINGER}
          gpg -a --export ${EM_ARCHIVE_KEY_FINGER} | sudo apt-key add -
          if ! grep "^${EM_REPO}" "${CROSSTOOLS_LIST}" &>/dev/null; then
            echo "${EM_SOURCE}" | sudo tee -a "${CROSSTOOLS_LIST}" >/dev/null
          fi
          arm_list+=" ${GPP_ARM_PACKAGE}"
        fi
      fi
    fi
    ;;
  # All necessary ARM packages are available on the default repos on
  # Debian 9 and later.
  *)
    arm_list="libc6-dev-armhf-cross
              linux-libc-dev-armhf-cross
              ${GPP_ARM_PACKAGE}"
    ;;
esac

# Work around for dependency issue Ubuntu/Trusty: http://crbug.com/435056
case $distro_codename in
  trusty)
    arm_list+=" g++-4.8-multilib-arm-linux-gnueabihf
                gcc-4.8-multilib-arm-linux-gnueabihf"
    ;;
  xenial|artful|bionic)
    arm_list+=" g++-5-multilib-arm-linux-gnueabihf
                gcc-5-multilib-arm-linux-gnueabihf
                gcc-arm-linux-gnueabihf"
    ;;
esac

# Packages to build NaCl, its toolchains, and its ports.
naclports_list="ant autoconf bison cmake gawk intltool xutils-dev xsltproc"
nacl_list="\
  g++-mingw-w64-i686
  lib32z1-dev
  libasound2:i386
  libcap2:i386
  libelf-dev:i386
  libfontconfig1:i386
  libglib2.0-0:i386
  libgpm2:i386
  libgtk2.0-0:i386
  libgtk-3-0:i386
  libncurses5:i386
  lib32ncurses5-dev
  libnss3:i386
  libpango1.0-0:i386
  libssl-dev:i386
  libtinfo-dev
  libtinfo-dev:i386
  libtool
  libxcomposite1:i386
  libxcursor1:i386
  libxdamage1:i386
  libxi6:i386
  libxrandr2:i386
  libxss1:i386
  libxtst6:i386
  texinfo
  xvfb
  ${naclports_list}
"

if package_exists libssl1.1; then
  nacl_list="${nacl_list} libssl1.1:i386"
elif package_exists libssl1.0.2; then
  nacl_list="${nacl_list} libssl1.0.2:i386"
else
  nacl_list="${nacl_list} libssl1.0.0:i386"
fi

# Some package names have changed over time
if package_exists libpng16-16; then
  lib_list="${lib_list} libpng16-16"
else
  lib_list="${lib_list} libpng12-0"
fi
if package_exists libnspr4-dbg; then
  dbg_list="${dbg_list} libnspr4-dbg libnss3-dbg"
  lib_list="${lib_list} libnspr4 libnss3"
else
  dbg_list="${dbg_list} libnspr4-0d-dbg libnss3-1d-dbg"
  lib_list="${lib_list} libnspr4-0d libnss3-1d"
fi
if package_exists libjpeg-dev; then
  dev_list="${dev_list} libjpeg-dev"
else
  dev_list="${dev_list} libjpeg62-dev"
fi
if package_exists libudev1; then
  dev_list="${dev_list} libudev1"
  nacl_list="${nacl_list} libudev1:i386"
else
  dev_list="${dev_list} libudev0"
  nacl_list="${nacl_list} libudev0:i386"
fi
if package_exists libbrlapi0.6; then
  dev_list="${dev_list} libbrlapi0.6"
else
  dev_list="${dev_list} libbrlapi0.5"
fi
if package_exists apache2.2-bin; then
  dev_list="${dev_list} apache2.2-bin"
else
  dev_list="${dev_list} apache2-bin"
fi
if package_exists libav-tools; then
  dev_list="${dev_list} libav-tools"
fi
if package_exists php7.2-cgi; then
  dev_list="${dev_list} php7.2-cgi libapache2-mod-php7.2"
elif package_exists php7.1-cgi; then
  dev_list="${dev_list} php7.1-cgi libapache2-mod-php7.1"
elif package_exists php7.0-cgi; then
  dev_list="${dev_list} php7.0-cgi libapache2-mod-php7.0"
else
  dev_list="${dev_list} php5-cgi libapache2-mod-php5"
fi

# Some packages are only needed if the distribution actually supports
# installing them.
if package_exists appmenu-gtk; then
  lib_list="$lib_list appmenu-gtk"
fi

# Cross-toolchain strip is needed for building the sysroots.
if package_exists binutils-arm-linux-gnueabihf; then
  dev_list="${dev_list} binutils-arm-linux-gnueabihf"
fi
if package_exists binutils-aarch64-linux-gnu; then
  dev_list="${dev_list} binutils-aarch64-linux-gnu"
fi
if package_exists binutils-mipsel-linux-gnu; then
  dev_list="${dev_list} binutils-mipsel-linux-gnu"
fi
if package_exists binutils-mips64el-linux-gnuabi64; then
  dev_list="${dev_list} binutils-mips64el-linux-gnuabi64"
fi

# When cross building for arm/Android on 64-bit systems the host binaries
# that are part of v8 need to be compiled with -m32 which means
# that basic multilib support is needed.
if file -L /sbin/init | grep -q 'ELF 64-bit'; then
  # gcc-multilib conflicts with the arm cross compiler (at least in trusty) but
  # g++-X.Y-multilib gives us the 32-bit support that we need. Find out the
  # appropriate value of X and Y by seeing what version the current
  # distribution's g++-multilib package depends on.
  multilib_package=$(apt-cache depends g++-multilib --important | \
      grep -E --color=never --only-matching '\bg\+\+-[0-9.]+-multilib\b')
  lib32_list="$lib32_list $multilib_package"
fi

if test "$do_inst_syms" = "" && test 0 -eq ${do_quick_check-0}
then
  echo "This script installs all tools and libraries needed to build Chromium."
  echo ""
  echo "For most of the libraries, it can also install debugging symbols, which"
  echo "will allow you to debug code in the system libraries. Most developers"
  echo "won't need these symbols."
  echo -n "Do you want me to install them for you (y/N) "
  if yes_no 1; then
    do_inst_syms=1
  fi
fi
if test "$do_inst_syms" = "1"; then
  echo "Including debugging symbols."
else
  echo "Skipping debugging symbols."
  dbg_list=
fi

if test "$do_inst_lib32" = "1" ; then
  echo "Including 32-bit libraries."
else
  echo "Skipping 32-bit libraries."
  lib32_list=
fi

if test "$do_inst_arm" = "1" ; then
  echo "Including ARM cross toolchain."
else
  echo "Skipping ARM cross toolchain."
  arm_list=
fi

if test "$do_inst_nacl" = "1"; then
  echo "Including NaCl, NaCl toolchain, NaCl ports dependencies."
else
  echo "Skipping NaCl, NaCl toolchain, NaCl ports dependencies."
  nacl_list=
fi

# The `sort -r -s -t: -k2` sorts all the :i386 packages to the front, to avoid
# confusing dpkg-query (crbug.com/446172).
packages="$(
  echo "${dev_list} ${lib_list} ${dbg_list} ${lib32_list} ${arm_list}"\
       "${nacl_list}" | tr " " "\n" | sort -u | sort -r -s -t: -k2 | tr "\n" " "
)"

if [ 1 -eq "${do_quick_check-0}" ] ; then
  if ! missing_packages="$(dpkg-query -W -f ' ' ${packages} 2>&1)"; then
    # Distinguish between packages that actually aren't available to the
    # system (i.e. not in any repo) and packages that just aren't known to
    # dpkg (i.e. managed by apt).
    missing_packages="$(echo "${missing_packages}" | awk '{print $NF}')"
    not_installed=""
    unknown=""
    for p in ${missing_packages}; do
      if apt-cache show ${p} > /dev/null 2>&1; then
        not_installed="${p}\n${not_installed}"
      else
        unknown="${p}\n${unknown}"
      fi
    done
    if [ -n "${not_installed}" ]; then
      echo "WARNING: The following packages are not installed:"
      echo -e "${not_installed}" | sed -e "s/^/  /"
    fi
    if [ -n "${unknown}" ]; then
      echo "WARNING: The following packages are unknown to your system"
      echo "(maybe missing a repo or need to 'sudo apt-get update'):"
      echo -e "${unknown}" | sed -e "s/^/  /"
    fi
    exit 1
  fi
  exit 0
fi

if test "$do_inst_lib32" = "1" || test "$do_inst_nacl" = "1"; then
  sudo dpkg --add-architecture i386
fi
sudo apt-get update

# We initially run "apt-get" with the --reinstall option and parse its output.
# This way, we can find all the packages that need to be newly installed
# without accidentally promoting any packages from "auto" to "manual".
# We then re-run "apt-get" with just the list of missing packages.
echo "Finding missing packages..."
# Intentionally leaving $packages unquoted so it's more readable.
echo "Packages required: " $packages
echo
new_list_cmd="sudo apt-get install --reinstall $(echo $packages)"
if new_list="$(yes n | LANGUAGE=en LANG=C $new_list_cmd)"; then
  # We probably never hit this following line.
  echo "No missing packages, and the packages are up to date."
elif [ $? -eq 1 ]; then
  # We expect apt-get to have exit status of 1.
  # This indicates that we cancelled the install with "yes n|".
  new_list=$(echo "$new_list" |
    sed -e '1,/The following NEW packages will be installed:/d;s/^  //;t;d')
  new_list=$(echo "$new_list" | sed 's/ *$//')
  if [ -z "$new_list" ] ; then
    echo "No missing packages, and the packages are up to date."
  else
    echo "Installing missing packages: $new_list."
    sudo apt-get install ${do_quietly-} ${new_list}
  fi
  echo
else
  # An apt-get exit status of 100 indicates that a real error has occurred.

  # I am intentionally leaving out the '"'s around new_list_cmd,
  # as this makes it easier to cut and paste the output
  echo "The following command failed: " ${new_list_cmd}
  echo
  echo "It produces the following output:"
  yes n | $new_list_cmd || true
  echo
  echo "You will have to install the above packages yourself."
  echo
  exit 100
fi

# Install the Chrome OS default fonts. This must go after running
# apt-get, since install-chromeos-fonts depends on curl.
if test "$do_inst_chromeos_fonts" != "0"; then
  echo
  echo "Installing Chrome OS fonts."
  dir=`echo $0 | sed -r -e 's/\/[^/]+$//'`
  if ! sudo $dir/linux/install-chromeos-fonts.py; then
    echo "ERROR: The installation of the Chrome OS default fonts failed."
    if [ `stat -f -c %T $dir` == "nfs" ]; then
      echo "The reason is that your repo is installed on a remote file system."
    else
      echo "This is expected if your repo is installed on a remote file system."
    fi
    echo "It is recommended to install your repo on a local file system."
    echo "You can skip the installation of the Chrome OS default founts with"
    echo "the command line option: --no-chromeos-fonts."
    exit 1
  fi
else
  echo "Skipping installation of Chrome OS fonts."
fi

echo "Installing locales."
CHROMIUM_LOCALES="da_DK.UTF-8 fr_FR.UTF-8 he_IL.UTF-8 zh_TW.UTF-8"
LOCALE_GEN=/etc/locale.gen
if [ -e ${LOCALE_GEN} ]; then
  OLD_LOCALE_GEN="$(cat /etc/locale.gen)"
  for CHROMIUM_LOCALE in ${CHROMIUM_LOCALES}; do
    sudo sed -i "s/^# ${CHROMIUM_LOCALE}/${CHROMIUM_LOCALE}/" ${LOCALE_GEN}
  done
  # Regenerating locales can take a while, so only do it if we need to.
  if (echo "${OLD_LOCALE_GEN}" | cmp -s ${LOCALE_GEN}); then
    echo "Locales already up-to-date."
  else
    sudo locale-gen
  fi
else
  for CHROMIUM_LOCALE in ${CHROMIUM_LOCALES}; do
    sudo locale-gen ${CHROMIUM_LOCALE}
  done
fi