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#!/bin/sh
#
# Copyright 2020 Sukma Wardana <hey@swardana.com>
#
# 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.
#
# Run 'sh cgit.SlackBuild' to build a Slackware package.
# The package (.tgz) and .txt file as well as build logs are created in /tmp.
# Install it using 'installpkg'.
#

# Set initial variables:

PRGNAM=cgit
VERSION=${VERSION:-1.2.3}
BUILD=${BUILD:-1}
# 'make' can run jobs in parallel for added speed. The number should be higher
# than the number of cores/virtual CPU's in your system:
NUMJOBS=${NUMJOBS:" -j4 "}
# The TAG is a unique identifier for all your Slackware packages.
# Use your initials as the value for TAG for instance.
TAG=${TAG:-_sw}

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

# This covers most filenames you'd want as documentation. Change if needed.
DOCS="cgitrc.5.txt COPYING README AUTHORS \
     $SRCDIR/extra/httpd-cgit.conf \
     $SRCDIR/extra/cgitrc.sample"

# The /srv/httpd is symbolic link into /var/www
DOCROOT=${DOCROOT:-/srv/httpd}

CGIT_VERSION=${CGIT_VERSION:-v$VERSION}

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

SOURCE="$SRCDIR/cgit-$VERSION.tar.xz"
SRCURL="https://git.zx2c4.com/cgit/snapshot/cgit-$VERSION.tar.xz"

##
## --- 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) export ARCH=i486 ;;
    arm*) export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) export ARCH=$( uname -m ) ;;
  esac
fi

case "$ARCH" in
  i486)   SLKCFLAGS="-O2 -march=i486 -mtune=i686"
          SLKLDFLAGS=""; LIBDIRSUFFIX=""
          ;;
  x86_64) SLKCFLAGS="-O2 -fPIC"
          SLKLDFLAGS="-L/usr/lib64"; LIBDIRSUFFIX="64"
          ;;
  *)      SLKCFLAGS="-O2"
          SLKLDFLAGS=""; LIBDIRSUFFIX=""
          ;;
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 $OUTPUT/{configure,make,install,error,makepkg}-$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 $SOURCE)"
    wget -nv -T 20 -O "${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..."
if $(file ${SOURCE} | grep -qi ": 7-zip"); then
  7za x ${SOURCE}
elif $(file ${SOURCE} | grep -qi ": zip"); then
  unzip ${SOURCE}
else
  tar -xvf ${SOURCE}
fi

cd ${PRGNAM}-${VERSION}

chown -R root:root .
chmod -R u+w,go+r-w,a+X-s .

echo "Building ..."

# Prepare the sources
sed -i Makefile -e "s;\/lib$;/lib${LIBDIRSUFFIX};" || exit 1

# Creating the cgit.conf file
sed -e "s|@DOCROOT@|$DOCROOT|g" $SRCDIR/extra/cgit.conf > cgit.conf
echo "CGIT_VERSION = $CGIT_VERSION" >> cgit.conf

make get-git
make $NUMJOBS 2>&1 | tee $OUTPUT/make-${PRGNAM}.log
make $NUMJOBS DESTDIR=$PKG install 2>&1 | tee $OUTPUT/install-${PRGNAM}.log

# prepare the cache dir: default permissions are for the apache user and group
mkdir -p $PKG/var/cache/cgit
chown apache:apache $PKG/var/cache/cgit
chmod 775 $PKG/var/cache/cgit

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

# Compress the man page(s):
if [ -d $PKG/usr/local/man ]; then
  find $PKG/usr/local/man -type f -name "*.?" -exec gzip -9f {} \;
  for i in $(find $PKG/usr/local/man -type l -name "*.?") ; do
    ln -s $( readlink $i ).gz $i.gz ; rm $i ;
  done
fi

# Compress info pages and remove the package's dir file:
if [ -d $PKG/usr/local/info ]; then
  rm -f $PKG/usr/local/info/dir
  gzip -9f $PKG/usr/local/info/*.info*
  # If any info files are present, consider adding this to a doinst.sh:
  # chroot . install-info /usr/local/info/XXXXX.info.gz /usr/local/info/dir 2> /dev/null
fi

# 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
if [ -f $SRCDIR/doinst.sh ]; then
  cat $SRCDIR/doinst.sh >> $PKG/install/doinst.sh
fi
if [ -f $SRCDIR/slack-required ]; then
  cat $SRCDIR/slack-required > $PKG/install/slack-required
fi

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

# Restore the original umask:
umask ${_UMASK_}