#!/bin/bash

# Slackware build script for dnscrypt-proxy

# Copyright 2023 thnkman <thnkman@proton.me>
# Based on Marco Bonetti's <sid77@slackware.it> tor script.
# 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)

PRGNAM=dnscrypt-proxy
VERSION=${VERSION:-2.1.5}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}
PKGTYPE=${PKGTYPE:-tgz}

DNSCRYPT_USER=${DNSCRYPT_USER:-dnscrypt}
DNSCRYPT_UID=${DNSCRYPT_UID:-293}
DNSCRYPT_GROUP=${DNSCRYPT_GROUP:-dnscrypt}
DNSCRYPT_GID=${DNSCRYPT_GID:-293}

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

if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
  exit 0
fi

TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

set -e

bailout() {
  echo -e "\nYou must have a $DNSCRYPT_USER user and $DNSCRYPT_GROUP group to run this script. "
  echo -e    "Something like this should suffice for most systems: "
  echo -e    "# groupadd -g $DNSCRYPT_GID $DNSCRYPT_GROUP "
  echo -e    "# useradd -u $DNSCRYPT_UID -g $DNSCRYPT_GID -c \"DNSCrypt-proxy\" -d /dev/null -s /bin/false $DNSCRYPT_USER \n"
  exit 1
}

if ! grep -q "^$DNSCRYPT_USER:" /etc/passwd > /dev/null 2>&1 ; then
  bailout
elif ! grep -q "^$DNSCRYPT_GROUP:" /etc/group > /dev/null 2>&1 ; then
  bailout
fi

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
if [[ $ARCH == i?86 ]]; then
  tar xvf $CWD/$PRGNAM-linux_i386-$VERSION.tar.gz --transform="s/linux-i386/$PRGNAM-$VERSION/"
elif [[ $ARCH == x86_64 ]]; then
  tar xvf $CWD/$PRGNAM-linux_x86_64-$VERSION.tar.gz --transform="s/linux-x86_64/$PRGNAM-$VERSION/"
else
  echo "Architecture not supported"
  exit 1
fi
cd $PRGNAM-$VERSION
chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
  -o -perm 511 \) -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

mkdir -p $PKG/usr/bin \
    $PKG/etc/{$PRGNAM,rc.d} \
    $PKG/var/{log,run}/$PRGNAM

cp -a ./*.txt $PKG/etc/$PRGNAM/
install -D -m 0755 $PRGNAM $PKG/usr/bin/$PRGNAM
install -D -m 0644 $CWD/$PRGNAM.toml $PKG/etc/$PRGNAM/$PRGNAM.toml
install -D -m 0644 $CWD/rc.$PRGNAM $PKG/etc/rc.d/rc.$PRGNAM

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a \
  LICENSE \
  $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/README.Slackware > $PKG/usr/doc/$PRGNAM-$VERSION/README.Slackware
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

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

sed -i "s/DNSCRYPT_UID=.*$/DNSCRYPT_UID=$DNSCRYPT_UID/" $PKG/install/doinst.sh
sed -i "s/DNSCRYPT_GID=.*$/DNSCRYPT_GID=$DNSCRYPT_GID/" $PKG/install/doinst.sh

cd $PKG
/sbin/makepkg -p -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE