#!/bin/bash

# Copyright 2015, 2016, 2018, 2020  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.

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

PKGNAM=glibc-zoneinfo
ZONE_VERSIONS="$(echo tzdata* | cut -f1 -d . | cut -b7-11)"
BUILD=${BUILD:-1}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i586 ;;
    arm*) readelf /usr/bin/file -A | grep -E -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *) ARCH=$(uname -m) ;;
  esac
  export ARCH
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 "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$ZONE_VERSIONS-noarch-$BUILD.txz"
  exit 0
fi

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

if [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-DHAVE_SNPRINTF=1 -O2 -march=pentium4 -mtune=generic"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-DHAVE_SNPRINTF=1 -O2 -march=x86-64 -mtune=generic -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-DHAVE_SNPRINTF=1 -O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-DHAVE_SNPRINTF=1 -O2"
  LIBDIRSUFFIX=""
fi

TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM

rm -rf $PKG
mkdir -p $TMP $PKG/etc

# Build and install the zoneinfo database:
cd $TMP
rm -rf tzcodedata-build
mkdir tzcodedata-build
cd tzcodedata-build
tar xzf $CWD/tzcode?????.tar.gz || exit 1
tar xzf $CWD/tzdata?????.tar.gz || exit 1

# Default to more bloated (but more compatible) "fat" format with zic.
# This was the default prior to tzcode2020b.
zcat $CWD/zic.default.fat.diff.gz | patch -p1 --verbose || 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 {} \+

sed -i "s,/usr/local,$(pwd),g" Makefile
sed -i "s,/etc/zoneinfo,/zoneinfo,g" Makefile
sed -i "s,^CFLAGS=,CFLAGS=		$SLKCFLAGS,g" Makefile
make || exit 1
make install DESTDIR=$PKG/stage || exit 1

# Install the primary zone files:
mkdir -p $PKG/usr/share
mv $PKG/stage/usr/share/zoneinfo $PKG/usr/share

# These are all identical to the normal zoneinfo files, so let's hard link
# them to save space:
cp -al $PKG/usr/share/zoneinfo $PKG/usr/share/posix
mv $PKG/usr/share/posix $PKG/usr/share/zoneinfo

# Install the "right" files:
mkdir -p $PKG/usr/share/zoneinfo/right
cp -a $PKG/stage/usr/share/zoneinfo-leaps/* $PKG/usr/share/zoneinfo/right

# Clean up staged file residue:
rm -rf $PKG/stage

# Remove $PKG/usr/share/zoneinfo/localtime -- the install script will
# create it as a link to /etc/localtime.
rm -f $PKG/usr/share/zoneinfo/localtime

# Install some scripts to help select a timezone:
mkdir -p $PKG/var/log/setup
cp -a $CWD/timezone-scripts/setup.timeconfig $PKG/var/log/setup
chown root:root $PKG/var/log/setup/setup.timeconfig
chmod 755 $PKG/var/log/setup/setup.timeconfig
mkdir -p $PKG/usr/sbin
cp -a $CWD/timezone-scripts/timeconfig $PKG/usr/sbin
chown root:root $PKG/usr/sbin/timeconfig
chmod 755 $PKG/usr/sbin/timeconfig
( cd $CWD/timezone-scripts
  # Try to rebuild this:
  sh output-updated-timeconfig.sh $PKG/usr/share/zoneinfo > $PKG/usr/sbin/timeconfig 2> /dev/null
)
# Note in timeconfig which zoneinfo database was used:
sed -i "s/# ChangeLog:/# ChangeLog:\n# $(date '+%Y-%m-%d'):   Updated timezones from tzdata${ZONE_VERSIONS}. <pjv>/g" $PKG/usr/sbin/timeconfig

# Don't forget to add the /usr/share/zoneinfo/localtime -> /etc/localtime symlink! :)
if [ ! -r $PKG/usr/share/zoneinfo/localtime ]; then
  ( cd $PKG/usr/share/zoneinfo ; ln -sf /etc/localtime . )
fi

mkdir -p $PKG/usr/doc/glibc-zoneinfo-$ZONE_VERSIONS
cp -a \
  CONTRIBUTING LICENSE NEWS README Theory \
  $PKG/usr/doc/glibc-zoneinfo-$ZONE_VERSIONS

mkdir -p $PKG/install
zcat $CWD/doinst.sh.gz > $PKG/install/doinst.sh
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
makepkg -l y -c n $TMP/glibc-zoneinfo-$ZONE_VERSIONS-noarch-$BUILD.txz