#!/bin/bash
#  Copyright (C) 2010-2012  Matias A. Fonzo, <selk@dragora.org>
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

replace_hard_links() {
  local name ; name="$2"
  ( cd "$1"
    find . ! -type d -links +1 ! -name "$name" -printf '%P\n' | \
     while read link ; do
      if [[ $name -ef $link ]]; then
        rm -f  $link
        ln -sf $name $link
      fi
     done
  )
}

CWD=$(pwd)

TMP=${TMP:-/tmp/sources}
OUT=${OUT:-/tmp/packages}

V=1.7.9.6
ARCH=${ARCH:-i486}
B=1

# Flags for the compiler:
DCFLAGS=${DCFLAGS:=-O2 -march=i486 -mtune=i686}

# Parallel jobs for the compiler:
JOBS=${JOBS:=-j4}

PKG=${TMP}/package-git

rm -rf $PKG
mkdir -p $PKG $OUT

echo "Checking for git..."
if type -P git ; then
  echo "Git detected: please, remove the package before build git."
  exit 1;
fi

echo "Uncompressing the tarball..."
rm -rf ${TMP}/git-${V}
lzip -cd ${CWD}/git-${V}.tar.lz | tar -xvf - -C $TMP

cd ${TMP}/git-${V}

# Set sane ownerships and permissions:
chown -R 0:0 .
find . \
 \( -perm 2777 -o \
    -perm 777  -o \
    -perm 775  -o \
    -perm 711  -o \
    -perm 555  -o \
    -perm 511     \
 \) -exec chmod 755 {} + \
  -o \
 \( -perm 666 -o \
    -perm 664 -o \
    -perm 600 -o \
    -perm 444 -o \
    -perm 440 -o \
    -perm 400    \
 \) -exec chmod 644 {} +

export CFLAGS="$DCFLAGS"

make prefix=/usr mandir=/usr/man \
 $JOBS \
 USE_LIBPCRE=1 \
 NO_CROSS_DIRECTORY_HARDLINKS=1

make prefix=/usr mandir=/usr/man \
 USE_LIBPCRE=1 \
 NO_CROSS_DIRECTORY_HARDLINKS=1 \
 DESTDIR=$PKG install

# Fix permissions:
find $PKG -type f -perm 444 | xargs chmod 644

# No hard links:

#replace_hard_links "${PKG}/usr/bin" "git"
( cd ${PKG}/usr/bin
  ln -sf git git-receive-pack
  ln -sf git git-upload-archive
)
replace_hard_links "${PKG}/usr/libexec/git-core" "git"

# Strip binaries & libraries:
( cd $PKG
  find . -type f | xargs file | awk '/ELF/ && /executable/ || /shared object/' | \
   cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
)

# No perllocal.pod:
( cd ${PKG}/usr/lib
  find . -type f -name 'perllocal.pod' -delete -printf '%h\n' | \
   while read dir ; do
    rmdir -p --ignore-fail-on-non-empty $dir
   done
)

# Change the information in the .packlist file:
( cd ${PKG}/usr/lib/perl?/site_perl/*/*-linux-gnu-thread-multi/auto/Git
  sed -e "s#$PKG##g" -e 's#share/man#man#g' -e 's/.3$/.3.gz/g' \
   .packlist > .packlist.new
  mv .packlist.new .packlist
)

# Move man-page directory:
if [[ -d ${PKG}/usr/share/man ]]; then
  mv ${PKG}/usr/share/man ${PKG}/usr
fi

# Compress and link manpages:
( cd $PKG/usr/man
  find . -type f -exec gzip -9N '{}' +
  find . -type l | while read file ; do
    ln -sf $(readlink $file).gz ${file}.gz
    rm $file
  done
)

# Add the documentation:
#
# TODO: The documentation-build is pending:
#
# (make install-doc).
#
mkdir -p ${PKG}/usr/doc/git-${V}
cp -a \
 COPYING README \
 ${PKG}/usr/doc/git-${V}

# Copy the description files:
mkdir -p ${PKG}/description
cp ${CWD}/description/* ${PKG}/description

cd $PKG
makepkg -l ${OUT}/git-${V}-${ARCH}-${B}.tlz