#!/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 -printf '%P\n' | \
     while read link ; do
      if [[ $link = ${name##*/} ]]; then
        continue;
      fi
      if [[ $name -ef $link ]]; then
        rm -f  $link
        ln -sf $name $link
      fi
     done
  )
}

CWD=$(pwd)

TMP=${TMP:-/tmp/sources/glibc}-$(mcookie)
OUT=${OUT:-/tmp/packages}

V=2.13_20110720
ARCH=${ARCH:-x86_64}
B=10

# Flags for the compiler:
DCFLAGS=${DCFLAGS:=-O2 -mtune=generic}

# Parallel jobs for the compiler:
JOBS=${JOBS:=-j1}

PKG=${TMP}/package-glibc

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

cd $TMP
rm -rf glibc-${V}

echo "Uncompressing the tarball..."
lzip -cd ${CWD}/glibc-${V}.tar.lz | tar -xvf -

cd glibc-${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 {} +

# This is provided by the "tzdatabase" package, so:
zcat ${CWD}/patches/dont.build.timezone.diff.gz | patch -p0 --verbose

# Apply a patch to not make the locale-archive:
zcat ${CWD}/patches/no-archive.diff.gz | patch -p0 --verbose

# The ldd shell script contains Bash-specific syntax, so:
sed -i 's|@BASH@|/bin/bash|' elf/ldd.bash.in

# Glibc needs a separate build directory:
rm -rf ../glibc-build
mkdir ../glibc-build
cd ../glibc-build

export CFLAGS="$DCFLAGS"

../glibc-${V}/configure \
 --prefix=/usr \
 --infodir=/usr/info \
 --mandir=/usr/man \
 --libexecdir=/usr/lib64/glibc \
 --enable-kernel=2.6.18 \
 --enable-add-ons=libidn,nptl \
 --enable-bind-now \
 --disable-profile \
 --with-headers=/usr/include \
 --with-elf \
 --with-tls \
 --with-__thread \
 --without-gd \
 --without-cvs \
 --without-selinux \
 --build=${ARCH}-dragora-linux-gnu

make $JOBS

# Don't print the harmless message:
mkdir -p ${PKG}/etc
touch ${PKG}/etc/ld.so.conf

make install install_root=$PKG
make $JOBS localedata/install-locales install_root=$PKG

# Increments a little the security:
find ${PKG}/sbin -type f -exec chmod -v 750 '{}' +
find ${PKG}/usr/sbin -type f -exec chmod -v 750 '{}' +

# Deletes unneeded files, provided by the etc package:
rm -f ${PKG}/etc/ld.so.{conf,cache}
# This is provided by the glibc_zoneinfo package:
rm -rf ${PKG}/usr/share/zoneinfo
rm -f ${PKG}/etc/localtime

# Back to the "greek" source:
cd -

# Add Name Service Cache Daemon:
mkdir -p ${PKG}/etc/sv/nscd
zcat ${CWD}/nscd.gz > ${PKG}/etc/sv/nscd/run.new
chmod 755 ${PKG}/etc/sv/nscd/run.new
mkdir -p ${PKG}/etc/runit/runsvdir/default
( cd ${PKG}/etc/runit/runsvdir/default ; ln -sf /etc/sv/nscd . )

# Add Name Service Cache Daemon (nscd) configuration file:
cat nscd/nscd.conf > ${PKG}/etc/nscd.conf.new

# Creates the directories for nscd:
mkdir -p ${PKG}/var/{db,run}/nscd

# Avoid "Invalid cross-device link":
( cd ${PKG}/usr/lib64/glibc/getconf || exit 1;
  replace_hard_links "${PKG}/usr/lib64/glibc/getconf" "../../../bin/getconf"
)

# Strip binaries & libraries:
( cd $PKG
  find . -type f | xargs file | awk '/ELF/ && /executable/ || /shared object/' | \
   cut -f 1 -d : | xargs strip --remove-section=.comment --remove-section=.note 2> /dev/null
  find . -type f | xargs file | awk '/current ar archive/' | \
   cut -f 1 -d : | xargs strip --strip-debug 2> /dev/null
)

# Add the "tzconfig" script:
mkdir -p ${PKG}/usr/sbin
cat ${CWD}/tzconfig/tzconfig > ${PKG}/usr/sbin/tzconfig
chmod 750 ${PKG}/usr/sbin/tzconfig

( cd ${CWD}/tzconfig/po
  for file in * ; do
    ext=${file#*.*.}

    mkdir -p ${PKG}/usr/share/locale/${ext}/LC_MESSAGES
    msgfmt -o ${PKG}/usr/share/locale/${ext}/LC_MESSAGES/tzconfig.mo $file

    # Convert our translation files to UTF-8:
    mkdir -p ${PKG}/usr/share/locale/${ext}.utf8/LC_MESSAGES
    iconv --from-code=ISO8859-1 --to-code=UTF8 $file | msgfmt - -o \
     ${PKG}/usr/share/locale/${ext}.utf8/LC_MESSAGES/tzconfig.mo
  done
)

# Compress GNU info documents:
rm -f ${PKG}/usr/info/dir # Redundancy
gzip -9N ${PKG}/usr/info/*

# Add documentation:
mkdir -p ${PKG}/usr/doc/glibc-${V}
cp -a \
 BUGS COPYING* CONFORMANCE ChangeLog FAQ LICENSES \
 NAMESPACE NEWS NOTES PROJECTS README README.libm \
 ${PKG}/usr/doc/glibc-${V}

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

# Add the post-install script:
mkdir -p ${PKG}/install
zcat ${CWD}/pre-post.gz > ${PKG}/install/pre-post
zcat ${CWD}/post-install.gz > ${PKG}/install/post-install

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