#!/bin/bash

# Copyright 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2018, 2019, 2020, 2021, 2022, 2023, 2024  Patrick J. Volkerding, Sebeka, Minnesota, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Thanks to the folks at the Mozilla Foundation for permission to
# distribute this, and for all the great work!  :-)

cd $(dirname $0) ; CWD=$(pwd)

PKGNAM=mozilla-firefox
VERSION=$(basename $(ls firefox-*.tar.?z | cut -d - -f 2 | rev | cut -f 3- -d . | rev) .source)
RELEASEVER=$(echo $VERSION | cut -f 1 -d r | cut -f 1 -d b | cut -f 1 -d e)
BUILD=${BUILD:-1}

# Specify this variable for a localized build.
# For example, to build a version of Firefox with Italian support, run
# the build script like this:
#
# MOZLOCALIZE=it ./mozilla-firefox.SlackBuild
#
MOZLOCALIZE=${MOZLOCALIZE:-}

# Without LANG=C, building the Python environment may fail with:
# "UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 36: ordinal not in range(128)"
LANG=C

# Add a shell script to start the firefox binary with MOZ_ALLOW_DOWNGRADE=1
# to avoid backing up (and disabling) the user profile if a browser downgrade
# is detected. We made it fine for years without this feature, and all the
# feedback we've seen suggests that it is causing more problems than it
# solves. For example, this feature causes a profile reset trying to switch
# between a 32-bit and 64-bit browser on installations that share a common
# /home directory. If you want to build with the stock default behavior, set
# this to something other than "YES":
MOZ_ALLOW_DOWNGRADE=${MOZ_ALLOW_DOWNGRADE:-YES}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) export ARCH=i686 ;;
    arm*) export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) export ARCH=$( uname -m ) ;;
  esac
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  if [ -z $MOZLOCALIZE ]; then
    echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz"
  else
    echo "$PKGNAM-$VERSION-$ARCH-${BUILD}_$MOZLOCALIZE.txz"
  fi
  exit 0
fi

# Firefox has been requiring more and more memory, especially while linking
# libxul. If it fails to build natively on x86 32-bit, it can be useful to
# attempt the build using an x86_64 kernel and a 32-bit userspace. Detect this
# situation and set the ARCH to i686. Later in the script we'll add some
# options to the .mozconfig so that the compile will do the right thing.
if [ "$(uname -m)" = "x86_64" -a "$(file -L /usr/bin/gcc | grep 386 | grep 32-bit)" != "" ]; then
  COMPILE_X86_UNDER_X86_64=true
  ARCH=i686
fi

# Choose a compiler (gcc/g++ or clang/clang++):
export CC=${CC:-clang}
export CXX=${CXX:-clang++}

# Set linker to use:
if [ "$CC" = "clang" -a "$(which lld 2> /dev/null)" = "/usr/bin/lld" ]; then
  # Upstream default:
  LINKER=lld
else
  LINKER=bfd
fi

# Keep memory usage as low as possible when linking:
if [ ! "$LINKER" = "lld" ]; then
  SLKLDFLAGS=" -Wl,--as-needed -Wl,--no-keep-memory -Wl,--stats -Wl,--reduce-memory-overheads"
  export LDFLAGS="$SLKLDFLAGS"
  export MOZ_LINK_FLAGS="$SLKLDFLAGS"
fi

# Put Rust objects on a diet to keep the linker from running into memory
# issues (especially on 32-bit):
export RUSTFLAGS="-Cdebuginfo=0"

# Use PGO?  Doubles the time and drive space requirements for the build,
# but should provide a performance increase.  How much depends on which
# benchmarks you believe, but I've typically seen around 2.5%.  I've also
# seen some which say it can be negligably (a fraction of a percent) slower
# with this enganged.  The anecdotal reports usually say there's a noticable
# improvement in overall responsiveness.  Seems like a good bet if you have
# the time and your system is able to handle it.  Set the variable to
# anything else prior to the build to compile Firefox in less time (but
# without the possible benefits of Profile-Guided Optimization).
#
# NOTE:  The 23.0 release fails to compile with a GLib assert error if PGO
# is enabled, so it is being disabled by default.  I can't say I ever noticed
# a lot of difference with this anyway (other than a much, much longer compile
# time.  But pass PGO=yes to the SlackBuild if you want to try it.
#if [ "$ARCH" = "x86_64" ]; then
#  PGO=${PGO:-yes}
#else
#  # 32-bit systems have problems compiling with PGO, as the per-process
#  # memory requirements are too large.  Possibly compiling with a 64-bit
#  # kernel could be a workaround for this, but for now we will default to
#  # using PGO only for x86_64.
#  PGO=${PGO:-no}
#fi
#
# PGO is disabled by default:
PGO=${PGO:-no}

if [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-g0"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-g0 -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "arm" ]; then
  SLKCFLAGS="-g0 -march=armv4 -mtune=xscale"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-g0"
  LIBDIRSUFFIX=""
fi

TMP=${TMP:-/tmp}
PKG=$TMP/package-mozilla-firefox

# If there is a private Google API key available at compile time, use
# it to enable support for Google Safe Browsing. For Slackware builds,
# we use a private key issued for the Slackware project. If you are
# rebuilding and need this support, or you are producing your own
# distribution, you may obtain your own Google API key at no charge by
# following these instructions:
# https://bugzilla.mozilla.org/show_bug.cgi?id=1377987#c0
if [ -r /root/google-api-key ]; then
  GOOGLE_API_KEY="--with-google-safebrowsing-api-keyfile=/root/google-api-key"
fi

# If not specified, figure out if this is a beta or a release
MOZVERS=${MOZVERS:-release}
if echo $VERSION | grep -q b ; then MOZVERS=beta ; fi

NUMJOBS=${NUMJOBS:-" -j$(expr $(nproc) + 1) "}

rm -rf $PKG
mkdir -p $TMP $PKG/usr/lib${LIBDIRSUFFIX}

# Build or unpack build-time dependencies:
. ./build-deps.sh

cd $TMP
rm -rf firefox-$RELEASEVER
# Unpack this in a subdirectory to prevent changing permissions on /tmp:
rm -rf firefox-unpack
mkdir firefox-unpack
cd firefox-unpack
echo "Extracting $CWD/firefox-$VERSION.source.tar.?z..."
tar xf $CWD/firefox-$VERSION.source.tar.?z || exit 1
mv * ..
cd ..
rm -rf firefox-unpack
cd firefox-$RELEASEVER || exit 1

# Delete object directory if it was mistakenly included in the tarball:
rm -rf obj-x86_64-pc-linux-gnu

# Prevent failures building gkrust by suppressing useless warnings:
sed -i.allow-warnings -e '/#!\[deny(warnings)\]/a #![allow(unused_imports)]' \
  servo/components/style/lib.rs

# Retain GTK+ v2 scrolling behavior:
zcat $CWD/ff.ui.scrollToClick.diff.gz | patch -p1 --verbose || exit 1

# Don't enable LTO for Rust unless the whole build uses it:
zcat $CWD/0027-LTO-Only-enable-LTO-for-Rust-when-complete-build-use.patch.gz | patch -p1 --verbose || exit 1

# Don't define a function that's included starting in glibc-2.36:
zcat $CWD/arc4random_buf.glibc-2.36.diff.gz | patch -p1 --verbose || exit 1

# Fix build with recent Python:
cat $CWD/b0dbc944fb7b.patch | patch -p1 --verbose || exit 1

# Fetch localization, if requested
# https://bugzilla.mozilla.org/show_bug.cgi?id=1256955
if [ ! -z $MOZLOCALIZE ]; then
  LOC_URL="http://ftp.mozilla.org/pub/firefox/candidates/$RELEASEVER-candidates/build1/l10n_changesets.txt"
  LOC_COMMIT=$(wget -q -O - $LOC_URL | grep ^$MOZLOCALIZE | cut -d\  -f2)
  hg clone https://hg.mozilla.org/l10n-central/$MOZLOCALIZE -r $LOC_COMMIT
fi

# Patch mimeTypes.rdf
# Uncomment this if you want to use the patch; otherwise, we overwrite the
# mimeTypes.rdf inside the package directory later
# zcat $CWD/mozilla-firefox-mimeTypes-fix.diff.gz | patch -p1 || exit 1

chown -R root:root .
find . \
  \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
  -exec chmod 755 {} \+ -o \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \+

# Our building options, in a configure-like display ;)
OPTIONS="\
  --enable-official-branding \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --with-system-zlib \
  --with-system-nss \
  --with-system-nspr \
  --with-unsigned-addon-scopes=app,system \
  --without-wasm-sandboxed-libraries \
  --allow-addon-sideload \
  --enable-alsa \
  --enable-application=browser \
  --enable-default-toolkit=cairo-gtk3-wayland \
  --enable-linker=$LINKER \
  --enable-optimize \
  $GOOGLE_API_KEY \
  --disable-strip \
  --disable-install-strip \
  --disable-tests \
  --enable-cpp-rtti \
  --enable-accessibility \
  --disable-crashreporter \
  --disable-debug-symbols \
  --disable-debug \
  --disable-elf-hack \
  --disable-updater"
# Complains about missing APNG support in Slackware's libpng:
# --with-system-png \
# This option breaks mozilla-12.0:
# --enable-system-cairo \
# NOTE:  It probably reduces bugs to use the bundled library versions,
# so in general we will not --enable-system-libraries.
# But since system zlib has been used for a long time and isn't a moving
# target, we'll leave that one as-is.
if [ ! -z $MOZLOCALIZE ]; then
  OPTIONS=$OPTIONS" \
  --enable-ui-locale=$MOZLOCALIZE
  --with-l10n-base=.."
  # There are no dictionaries in localized builds
  sed -i \
    -e "/@BINPATH@\/dictionaries\/\*/d" \
    -e "/@RESPATH@\/dictionaries\/\*/d" \
    browser/installer/package-manifest.in || exit 1
fi

# They say to use the second line, not the first.
# But they're not the boss of me.
export MACH_USE_SYSTEM_PYTHON="1"
#export MACH_BUILD_PYTHON_NATIVE_PACKAGE_SOURCE=system
export MOZILLA_OFFICIAL="1"
export BUILD_OFFICIAL="1"
export MOZ_PHOENIX="1"
export MOZ_PACKAGE_JSSHELL="1"
export CFLAGS="$SLKCFLAGS"
export CXXFLAGS="$SLKCFLAGS -fno-delete-null-pointer-checks -Wno-error=c++11-narrowing-const-reference"
export MOZ_MAKE_FLAGS="$NUMJOBS"
export MOZBUILD_STATE_PATH="$TMP/firefox-$RELEASEVER/.mozbuild"
export MOZ_APP_REMOTINGNAME="firefox"

# Clear some variables that could break the build
unset DBUS_SESSION_BUS_ADDRESS ORBIT_SOCKETDIR SESSION_MANAGER \
  XDG_SESSION_COOKIE XAUTHORITY MAKEFLAGS

# Assemble our .mozconfig, we use this method for building, seems
# needed for PGO.
echo ". \$topsrcdir/browser/config/mozconfig" > .mozconfig

# Mozilla devs enforce using an objdir for building
# https://developer.mozilla.org/en/Configuring_Build_Options#Building_with_an_objdir
mkdir obj
echo "mk_add_options MOZ_OBJDIR=$(pwd)/obj" >> .mozconfig

if [ "$MOZLOCALIZE" ]; then
  echo "mk_add_options MOZ_CO_LOCALES=\"$MOZLOCALIZE\"" >> .mozconfig
fi

# Tell .mozconfig about the selected compiler:
echo "export CC=\"${CC}\"" >> .mozconfig
echo "export CXX=\"${CXX}\"" >> .mozconfig

if [ "$COMPILE_X86_UNDER_X86_64" = "true" ]; then
  # Compile for i686 under an x86_64 kernel:
  echo "ac_add_options --host=i686-pc-linux-gnu" >> .mozconfig
  echo "ac_add_options --target=i686-pc-linux-gnu" >> .mozconfig
fi

# Add the $OPTIONS above to .mozconfig:
for option in $OPTIONS; do echo "ac_add_options $option" >> .mozconfig; done

# https://developer.mozilla.org/en-US/docs/Building_with_Profile-Guided_Optimization
# Thanks to ArchLinux and Gentoo for the additional hints.
if [ "$PGO" = "yes" ]; then
  # Do a PGO build, double time and disk space but worth it.
  export MOZ_PGO=1
  echo "mk_add_options PROFILE_GEN_SCRIPT='EXTRA_TEST_ARGS=10 \$(MAKE) -C \$(MOZ_OBJDIR) pgo-profile-run'" >> .mozconfig
  export DISPLAY=:99
  # Launch Xvfb to let the profile scripts run in a X session.
  # Ugly note: if the build breaks you may want to do a "killall Xvfb".
  Xvfb -nolisten tcp -extension GLX -screen 0 1280x1024x24 $DISPLAY &
  dbus-launch --exit-with-session ./mach build || exit 1
  kill $! || true
else
  # Do a normal build
  ./mach build || exit 1
fi

./mach buildsymbols || exit 1
DESTDIR=$PKG ./mach install || exit 1

# Strip binaries:
find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null

## Clean up the build time dependencies:
#rm -rf $TMP/mozilla-firefox-build-deps

# We don't need these (just symlinks anyway):
rm -rf $PKG/usr/lib${LIBDIRSUFFIX}/firefox-devel-$RELEASEVER

# Nor these:
rm -rf $PKG/usr/include

# 2022-12, COMMENTING OUT AS OBSOLETE
#( cd $PKG/usr/lib${LIBDIRSUFFIX}/firefox
#  #mv defaults/profile/mimeTypes.rdf defaults/profile/mimeTypes.rdf.orig || exit 1
#  if [ -d defaults/profile ]; then
#    zcat $CWD/mimeTypes.rdf > defaults/profile/mimeTypes.rdf || exit 1
#  fi
#  # OK, this patch is useless on 7.x.  We'll float without it and see what happens.
#  # Perhaps it won't make a difference or should be worked around elsewhere.
#  #zcat $CWD/firefox.moz_plugin_path.diff.gz \
#  #  | sed -e "s#usr/lib#usr/lib${LIBDIRSUFFIX}#g" \
#  #  | patch -p1 --verbose --backup --suffix=.orig || exit 1
#  # Clean up if the above patch was successful:
#  #rm -f firefox.orig
#) || exit

mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}/mozilla/plugins
mkdir -p $PKG/usr/share/applications
cat $CWD/firefox.desktop > $PKG/usr/share/applications/firefox.desktop

# Need some default icons in the right place:
for i in 16 22 24 32 48 256; do
  install -m 0644 -D browser/branding/official/default${i}.png \
    $PKG/usr/share/icons/hicolor/${i}x${i}/apps/firefox.png
done
mkdir -p $PKG/usr/share/pixmaps
( cd $PKG/usr/share/pixmaps ; ln -sf /usr/share/icons/hicolor/256x256/apps/firefox.png . )
mkdir -p $PKG/usr/lib$LIBDIRSUFFIX/firefox-$RELEASEVER/chrome/icons/default
install -m 644 browser/branding/official/default16.png \
  $PKG/usr/lib$LIBDIRSUFFIX/firefox-$RELEASEVER/icons/
install -m 644 browser/branding/official/default16.png \
  $PKG/usr/lib$LIBDIRSUFFIX/firefox-$RELEASEVER/chrome/icons/default/

# Copy over the LICENSE
install -p -c -m 644 LICENSE $PKG/usr/lib${LIBDIRSUFFIX}/firefox-$RELEASEVER/

# If MOZ_ALLOW_DOWNGRADE=YES, replace the /usr/bin/firefox symlink with a
# shell script that sets the MOZ_ALLOW_DOWNGRADE=1 environment variable so
# that a detected browser downgrade does not reset the user profile:
if [ "$MOZ_ALLOW_DOWNGRADE" = "YES" ]; then
  rm -f $PKG/usr/bin/firefox
  cat << EOF > $PKG/usr/bin/firefox
#!/bin/sh
#
# Shell script to start Mozilla Firefox.
#
# Don't reset the user profile on a detected browser downgrade:
export MOZ_ALLOW_DOWNGRADE=1

# Start Firefox:
exec /usr/lib${LIBDIRSUFFIX}/firefox/firefox "\$@"
EOF
  chown root:root $PKG/usr/bin/firefox
  chmod 755 $PKG/usr/bin/firefox
fi

# Fix duplicate binary, https://bugzilla.mozilla.org/show_bug.cgi?id=658850
( cd $PKG/usr/lib$LIBDIRSUFFIX/firefox
  if cmp firefox firefox-bin ; then
    ln -sf firefox-bin firefox
  fi
)

mkdir $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
if [ -z $MOZLOCALIZE ]; then
  /sbin/makepkg -l y -c n $TMP/mozilla-firefox-$VERSION-$ARCH-$BUILD.txz
else
  /sbin/makepkg -l y -c n $TMP/mozilla-firefox-$VERSION-$ARCH-${BUILD}_$MOZLOCALIZE.txz
fi