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#!/bin/sh

# Slackware build script for ft2demos

# Written by B. Watson (yalhcru@gmail.com)

# Licensed under the WTFPL. See http://www.wtfpl.net/txt/copying/ for details.

# This thing requires first building (but not installing) freetype2,
# hence all the downloads.

# This script is heavily based on Pat Volkerding's freetype.SlackBuild:
# https://slackware.uk/slackware/slackware-14.2/patches/source/freetype/
# ...and Arch Linux's freetype2-demos PKGBUILD:
# https://git.archlinux.org/svntogit/packages.git/tree/trunk?h=packages/freetype2

# Note to self: keep VERSION in sync with Pat's patches/freetype.

PRGNAM=ft2demos
VERSION=${VERSION:-2.6.3}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

LIBNAM=freetype

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-build
mkdir -p $PRGNAM-build
cd $PRGNAM-build
tar xvf $CWD/$LIBNAM-$VERSION.tar.xz
tar xvf $CWD/$PRGNAM-$VERSION.tar.bz2
chown -R root:root .
find -L .  -perm /111 -a \! -perm 755 -a -exec chmod 755 {} \+ -o \
        \! -perm /111 -a \! -perm 644 -a -exec chmod 644 {} \+

# Build process wants this symlink.
ln -s $LIBNAM-$VERSION ${LIBNAM}2

### First, build FreeType, since ft2demos needs the whole source tree.
cd $LIBNAM-$VERSION

# Apply Pat's patches
zcat $CWD/freetype.illadvisederror.diff.gz | patch -p1
zcat $CWD/freetype.CVE-2017-8287.diff.gz | patch -p1

# Enable the validators needed by the ftvalid command. Part 1 of a
# DIRTY_HACK to make ftvalid work.
sed -i '/^# *AUX_MODULES.*valid/s|^# *||' modules.cfg

# Use Pat's build command (but no make install!)
CFLAGS="$SLKCFLAGS" \
  make setup \
  CFG="--prefix=/usr --libdir=/usr/lib${LIBDIRSUFFIX} --build=$ARCH-slackware-linux"
make

### Now, build ft2demos. These will end up dynamically linked to the
#   system libfreetype.so after package installation, *except* for
#   ftvalid, which won't work with Slackware's libfreetype.so, so it
#   gets statically linked with the libfreetype.a we just built. See
#   DIRTY_HACK, parts 1 and 2.
cd $TMP/$PRGNAM-build/$PRGNAM-$VERSION

# Build the extra executables
sed -i '/^  *# *EXES/s|# *||' Makefile

# Don't try to build ftvalid yet. If we do, the resulting binary is
# useless, complains that none of its validation methods are compiled in,
# and suggests rebuilding FreeType.
sed -i '/EXES *+= *ftvalid/d' Makefile

# Don't include RPATH in binaries (borrowed from Arch)
sed -i '/X11_LIB:%=-R%/d' graph/x11/rules.mk

# Don't have to specify CFLAGS here, it'll pick them up from the freetype
# build we just did.
make

# DIRTY_HACK, part 2. Get the link command libtool generated for ftvalid,
# and replace freetype.so with freetype.a (the static lib). This is me
# working around libtool's "helpful" automation. Die, libtool!
echo "=== Prepare for dirty hack, put on your goggles now"
make EXES=ftvalid | tee make.out

echo "=== ftvalid.build.cmd:"
grep '^libtool: link:' make.out | \
  cut -d: -f3- | \
  sed 's|/usr/lib[^/]*/libfreetype.so||' | \
  sed 's|\([^ *]\.libs/libfreetype.\)so|\1a|' | \
  tee ftvalid.build.cmd

# Now run the abomination we've created. If it fails, don't let set -e
# kill the whole script (we'll just make a package without ftvalid).
sh ./ftvalid.build.cmd || echo "!!! Attempt to build ftvalid failed"

# The semi-static ftvalid is big, but still under 1MB. Also, if you
# run ldd on it, you'll see libfreetype.so is required... this is because
# of a circular dependency with harfbuzz. It doesn't seem to cause a
# problem for ftvalid.
echo "=== Stand down from dirty hack alert, you may now remove your goggles"

# There is no 'make install', this bit was borrowed from Arch.
mkdir -p $PKG/usr/bin
for i in bin/{f,t}t*; do
  libtool --mode=install install $i $PKG/usr/bin
done
strip $PKG/usr/bin/*

# For whatever reason, the Arch and Debian packages don't install the
# man pages.
mkdir -p $PKG/usr/man/man1
for i in src/*.1; do
  gzip -9c < $i > $PKG/usr/man/man1/$( basename $i).gz
done

# The README is build instructions, don't bother. Instead, include our
# own README which at least lists the tools and their short descriptions.
# The ChangeLog goes back to 2000, don't need the whole damn thing.
mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
head -n1000 ChangeLog > $PKG/usr/doc/$PRGNAM-$VERSION/ChangeLog
cat $CWD/README > $PKG/usr/doc/$PRGNAM-$VERSION/README_SBo.txt
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

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

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}