#!/bin/sh
# $Id$
# Copyright 2021  Eric Hameleers, Eindhoven, NL
# All rights reserved.
#
#   Permission to use, copy, modify, and distribute this software for
#   any purpose with or without fee is hereby granted, provided that
#   the above copyright notice and this permission notice appear in all
#   copies.
#
#   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 AUTHORS AND COPYRIGHT HOLDERS AND THEIR
#   CONTRIBUTORS 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.
# -----------------------------------------------------------------------------
#
# Slackware SlackBuild script 
# ===========================
# By:          Eric Hameleers <alien@slackware.com>
# For:         mongodb
# Descr:       document database server
# URL:         https://www.mongodb.org/
# Build needs: python-cheetah3, python-psutil, python-yaml
#              (on Slackware 14.2 additionally: python3, python3-setuptools,
#               scons >= 3.,; gcc >= 8.2)
# Needs:       
# Changelog:   
# 4.4.4-1:     02/mar/2021 by Eric Hameleers <alien@slackware.com>
#              * Initial build.
#                NOTE: since version 3.4 MongoDB no longer supports
#                      32-bit x86 platforms.
# 4.4.4-2:     10/mar/2021 by Eric Hameleers <alien@slackware.com>
#              * Fix the rc script when /var/run is a tmpfs.
# 
# Run 'sh mongodb.SlackBuild' to build a Slackware package.
# The package (.t?z) and .txt file as well as build logs are created in /tmp .
# Install the package using 'installpkg' or 'upgradepkg --install-new'.
#
# -----------------------------------------------------------------------------

PRGNAM=mongodb
VERSION=${VERSION:-4.4.4}
BUILD=${BUILD:-2}
NUMJOBS=${NUMJOBS:-" -j$(nproc) "}
TAG=${TAG:-alien}

DOCS="APACHE-2.0.txt CONTRIBUTING.rst \
  CreativeCommons.txt LICENSE-Community.txt \
  README README.third_party.md distsrc"

# User 'mongo' (uidNr=285) and group 'mongo' (grpId=285) are also used by SBo.
MONGO_UID=${MONGO_UID:-285}
MONGO_GID=${MONGO_GID:-285}

# User and group must be present on build system:
if ! getent passwd mongo 1>/dev/null 2>/dev/null; then
  printf "\n\tYou must have a 'mongo' user and group to run this script:\n"
  printf "\t# groupadd -g $MONGO_GID mongo\n"
  printf "\t# useradd -g $MONGO_GID -u $MONGO_UID -M -d /var/lib/mongodb -s /bin/false mongo\n\n"
  exit 1
fi

# Where do we look for sources?
SRCDIR=$(cd $(dirname $0); pwd)

# Place to build (TMP) package (PKG) and output (OUTPUT) the program:
TMP=${TMP:-/tmp/build}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

SOURCE="$SRCDIR/${PRGNAM}-src-r${VERSION}.tar.gz"
SRCURL="https://fastdl.mongodb.org/src/${PRGNAM}-src-r${VERSION}.tar.gz"

##
## --- with a little luck, you won't have to edit below this point --- ##
##

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i586
          echo "ERROR: 32-bit x86 architecture no longer supported!"
          exit 99
          ;;
    arm*) readelf /usr/bin/file -A | egrep -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
# Set CFLAGS/CXXFLAGS and LIBDIRSUFFIX:
case "$ARCH" in
  x86_64)    SLKCFLAGS="-O2 -fPIC"
             SLKLDFLAGS="-L/usr/lib64"; LIBDIRSUFFIX="64"
             ;;
  *)         SLKCFLAGS=${SLKCFLAGS:-"-O2"}
             SLKLDFLAGS=${SLKLDFLAGS:-""}; LIBDIRSUFFIX=${LIBDIRSUFFIX:-""}
             ;;
esac

case "$ARCH" in
    arm*)    TARGET=$ARCH-slackware-linux-gnueabi ;;
    *)       TARGET=$ARCH-slackware-linux ;;
esac

# Exit the script on errors:
set -e
trap 'echo "$0 FAILED at line ${LINENO}" | tee $OUTPUT/error-${PRGNAM}.log' ERR
# Catch unitialized variables:
set -u
P1=${1:-1}

# Save old umask and set to 0022:
_UMASK_=$(umask)
umask 0022

# Create working directories:
mkdir -p $OUTPUT          # place for the package to be saved
mkdir -p $TMP/tmp-$PRGNAM # location to build the source
mkdir -p $PKG             # place for the package to be built
rm -rf $PKG/*             # always erase old package's contents
rm -rf $TMP/tmp-$PRGNAM/* # remove the remnants of previous build
rm -rf $OUTPUT/{checkout,configure,make,install,error,makepkg,patch}-$PRGNAM.log
                          # remove old log files

# Source file availability:
if ! [ -f ${SOURCE} ]; then
  echo "Source '$(basename ${SOURCE})' not available yet..."
  # Check if the $SRCDIR is writable at all - if not, download to $OUTPUT
  [ -w "$SRCDIR" ] || SOURCE="$OUTPUT/$(basename $SOURCE)"
  if [ -f ${SOURCE} ]; then echo "Ah, found it!"; continue; fi
  if ! [ "x${SRCURL}" == "x" ]; then
    echo "Will download file to $(dirname $SOURCE)"
    wget --no-check-certificate -nv -T 20 -O "${SOURCE}" "${SRCURL}" || true
    if [ $? -ne 0 -o ! -s "${SOURCE}" ]; then
      echo "Downloading '$(basename ${SOURCE})' failed... aborting the build."
      mv -f "${SOURCE}" "${SOURCE}".FAIL
      exit 1
    fi
  else
    echo "File '$(basename ${SOURCE})' not available... aborting the build."
    exit 1
  fi
fi

if [ "$P1" == "--download" ]; then
  echo "Download complete."
  exit 0
fi

# --- PACKAGE BUILDING ---

echo "++"
echo "|| $PRGNAM-$VERSION"
echo "++"

cd $TMP/tmp-$PRGNAM
echo "Extracting the source archive(s) for $PRGNAM..."
tar -xvf ${SOURCE}
cd ${PRGNAM}-src-r${VERSION}

# Regular build results in mongo binaries of 1 to almost 3 GB a piece, since
# they contain useless debug code which we then strip anyway.
# So prevent adding debug symbols from the start:
sed -i '/"-ggdb" if not env.TargetOSIs/d' SConstruct

chown -R root:root .
chmod -R u+w,go+r-w,a+rX-st .

echo Building ...
export LDFLAGS="$SLKLDFLAGS"
export CXXFLAGS="$SLKCFLAGS"
export CFLAGS="$SLKCFLAGS"
export SCONSFLAGS="$NUMJOBS"
export LINKFLAGS="-Wl,-static -static-libgcc -static-libstdc++"

scons core \
  --prefix=/usr \
  --install-mode=legacy \
  --link-model=static \
  --release \
  --disable-warnings-as-errors \
  --ssl \
  --use-sasl-client \
  2>&1 | tee $OUTPUT/make-${PRGNAM}.log

scons install \
  --prefix=$PKG/usr \
  --install-mode=legacy \
  --link-model=static \
  --release \
  --disable-warnings-as-errors \
  --ssl \
  --use-sasl-client \
  2>&1 | tee $OUTPUT/install-${PRGNAM}.log

# Remove install script for compass:
rm -f $PKG/usr/bin/install_compass

# On Slackware older than 14.2+, also copy the libgcc_s.so and libstdc++.so
# libraries into the package, because the mongodb binaries will
# depend on it and a default Slackware will not contain this newer version
# (we used a newer version of gcc to compile mongodb):
if [ -n "$(grep ^[^+]*$ /etc/slackware-version)" ]; then
  if [ $(cat /etc/slackware-version |cut -d' ' -f2 |cut -d. -f1) -le 14 ]; then
    mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}/mongodb
    cp -ia /usr/lib${LIBDIRSUFFIX}/libgcc_s.so.* \
      $PKG/usr/lib${LIBDIRSUFFIX}/mongodb/
    GLIBCXXLIB=$(readlink -f /usr/lib${LIBDIRSUFFIX}/libstdc++.so.6)
    cp -ia $GLIBCXXLIB $PKG/usr/lib${LIBDIRSUFFIX}/mongodb/
    ln -s $(basename $GLIBCXXLIB) \
      $PKG/usr/lib${LIBDIRSUFFIX}/mongodb/libstdc++.so.6

    # Move mongodb binaries into the custom directory and create symlinks,
    # so that we can preload the internal gcc libraries:
    for MBIN in mongo mongod mongos ; do
      mv -i $PKG/usr/bin/$MBIN $PKG/usr/lib${LIBDIRSUFFIX}/mongodb/
      cat <<EOT > $PKG/usr/bin/${MBIN}
#!/bin/sh
MONGODIR=/usr/lib${LIBDIRSUFFIX}/mongodb
cd \$MONGODIR
LD_PRELOAD="\$MONGODIR/libstdc++.so.6 \$MONGODIR/libgcc_s.so.1" \$MONGODIR/\$(basename \$0) "\$@"
EOT
      chmod 0755 $PKG/usr/bin/${MBIN}
    done
  fi
fi

# Add this to the doinst.sh:
mkdir -p $PKG/install
cat <<EOINS >> $PKG/install/doinst.sh
# Handle the incoming configuration files:
config() {
  for infile in \$1; do
    NEW="\$infile"
    OLD="\$(dirname \$NEW)/\$(basename \$NEW .new)"
    # If there's no config file by that name, mv it over:
    if [ ! -r \$OLD ]; then
      mv \$NEW \$OLD
    elif [ "\$(cat \$OLD | md5sum)" = "\$(cat \$NEW | md5sum)" ]; then
      # toss the redundant copy
      rm \$NEW
    fi
    # Otherwise, we leave the .new copy for the admin to consider...
  done
}

preserve_perms() {
  NEW="\$1"
  OLD="\$(dirname \$NEW)/\$(basename \$NEW .new)"
  if [ -e \$OLD ]; then
    cp -a \$OLD \${NEW}.incoming
    cat \$NEW > \${NEW}.incoming
    mv \${NEW}.incoming \$NEW
  fi
  config \$NEW
}

config etc/mongod.conf.new
preserve_perms etc/rc.d/rc.mongodb.new

# Only way to create and use the correct uid and gid on the target system,
# is to use chroot:
chroot . <<EOR 2>/dev/null
# Add the '${MONGO_GID}' group if it doesn't exist already:
/usr/sbin/groupadd -g ${MONGO_GID} mongo 2> /dev/null

# Add the '${MONGO_UID}' user if it doesn't exist already:
/usr/sbin/useradd -c "MongoDB server account" -d /var/lib/mongodb -M \\
  -s "/bin/false" -g ${MONGO_GID} -u ${MONGO_UID} mongo 2> /dev/null
EOR

# Update rc.local so that MongoDB will be started on boot
if ! grep "rc.mongodb" etc/rc.d/rc.local 1>/dev/null 2>&1 ; then
  cat <<_EOM_ >> etc/rc.d/rc.local

if [ -x /etc/rc.d/rc.mongodb ]; then
  # Start MongoDB server
  echo "Starting MongoDB:    /etc/rc.d/rc.mongodb start"
  /etc/rc.d/rc.mongodb start
fi
_EOM_
fi

EOINS

# Install a rc script:
install -D -m0755 $SRCDIR/rc.mongodb $PKG/etc/rc.d/rc.mongodb.new

# Install a basic configuration file which will be read by rc.mongodb:
install -D -m0644 $SRCDIR/mongod.conf.sample $PKG/etc/mongod.conf.new

# Create the database directory:
mkdir -p $PKG/var/lib/mongodb
chown ${MONGO_UID}:${MONGO_GID} $PKG/var/lib/mongodb

# Create the log directory:
mkdir -p $PKG/var/log/mongodb
chown ${MONGO_UID} $PKG/var/log/mongodb
chmod 750 $PKG/var/log/mongodb

# Create the pid directory:
mkdir -p $PKG/var/run/mongodb
chown ${MONGO_UID} $PKG/var/run/mongodb
chmod 750 $PKG/var/run/mongodb

# Add documentation:
mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a $DOCS $PKG/usr/doc/$PRGNAM-$VERSION || true
cat $SRCDIR/$(basename $0) > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
chown -R root:root $PKG/usr/doc/$PRGNAM-$VERSION
find $PKG/usr/doc -type f -exec chmod 644 {} \;

# Manuall install the man page(s):
mkdir -p $PKG/usr/man/man1
install -D -m0644 debian/mongo.1 $PKG/usr/man/man1/mongo.1
install -D -m0644 debian/mongod.1 $PKG/usr/man/man1/mongod.1
install -D -m0644 debian/mongos.1 $PKG/usr/man/man1/mongos.1
find $PKG/usr/man -type f -name "*.?" -exec gzip -9f {} \;

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

# Add a package description:
mkdir -p $PKG/install
cat $SRCDIR/slack-desc > $PKG/install/slack-desc
cat $SRCDIR/slack-required > $PKG/install/slack-required

# Build the package:
cd $PKG
makepkg --linkadd y --chown n $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz} 2>&1 | tee $OUTPUT/makepkg-${PRGNAM}.log
cd $OUTPUT
md5sum ${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz} > ${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.${PKGTYPE:-txz}.md5
cd -
cat $PKG/install/slack-desc | grep "^${PRGNAM}" > $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.txt
cat $PKG/install/slack-required > $OUTPUT/${PRGNAM}-${VERSION}-${ARCH}-${BUILD}${TAG}.dep

# Restore the original umask:
umask ${_UMASK_}