#!/bin/sh
# $Id$
# Copyright 2010, 2011, 2012  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:        qemu-kvm
# Descr:      userspace component for kvm
# URL:        http://www.linux-kvm.org/page/Main_Page
# Needs:      vde
# Changelog:  
# 0.12.5-1:   23/Aug/2010 by Eric Hameleers <alien@slackware.com>
#             * Initial build.
# 0.14.0-1:   28/mar/2011 by Eric Hameleers <alien@slackware.com>
#             * Update.
# 0.15.0-1:   14/aug/2011 by Eric Hameleers <alien@slackware.com>
#             * Update.
# 1.0-1:      06/dec/2011 by Eric Hameleers <alien@slackware.com>
#             * A 1.0 release !!!
# 1.0-2:      18/feb/2012 by Eric Hameleers <alien@slackware.com>
#             * Align the package with the SlackBuild from slackbuilds.org
#               which removes support for all architectures except x86, and
#               renames the single binary qemu-system-x86_64 to qemu-kvm.
#               This allows it to co-exist with a qemu package which supports
#               all other virtualization targets.
# 1.0.1-1:    19/may/2012 by Eric Hameleers <alien@slackware.com>
#             * Update.
# 1.1.1-1:    26/jul/2012 by Eric Hameleers <alien@slackware.com>
#             * Update.
# 1.2.0-1:    25/sep/2012 by Eric Hameleers <alien@slackware.com>
#             * Update.
# 
# Run 'sh qemu-kvm.SlackBuild' to build a Slackware package.
# The package (.txz) and .txt file as well as build logs are created in /tmp .
# Install it using 'installpkg'. 
#
# -----------------------------------------------------------------------------

# Note that qemu-kvm only offers kernel acceleration through KVM if the guest
# VM is x86_64 (in system emulation).
# If you need system emulation targets other than x86_64 and x86, then
# it is qemu (not qemu-kvm) which you should use.

PRGNAM=qemu-kvm
VERSION=${VERSION:-1.2.0}
BUILD=${BUILD:-1}
NUMJOBS=${NUMJOBS:" -j4 "}
TAG=${TAG:-alien}

DOCS="CODING_STYLE COPYING* Changelog EXTERNAL_DEPENDENCIES \
      KVM_VERSION LICENSE MAINTAINERS README TODO VERSION \
      kvm/scripts"

# 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}-${VERSION}.tar.gz"
SRCURL="http://sourceforge.net/projects/kvm/files/${PRGNAM}/${VERSION}/${PRGNAM}-${VERSION}.tar.gz/download"

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

# Automatically determine the architecture we're building on:
MARCH=$( uname -m )
if [ -z "$ARCH" ]; then
  case "$MARCH" in
    i?86)    export ARCH=i486 ;;
    armv7hl) export ARCH=$MARCH ;;
    arm*)    export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *)       export ARCH=$MARCH ;;
  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"
             ;;
  armv7hl)   SLKCFLAGS="-O2 -march=armv7-a -mfpu=vfpv3-d16"
             SLKLDFLAGS=""; LIBDIRSUFFIX=""
             ;;
  *)         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..."
tar -xvf ${SOURCE}
cd ${PRGNAM}-${VERSION}

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

echo Building ...
LDFLAGS="$SLKLDFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
CFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --sysconfdir=/etc \
  --mandir=/usr/man \
  --datadir=/usr/share/$PRGNAM \
  --docdir=/usr/doc/$PRGNAM-$VERSION \
  --enable-system \
  --target-list="x86_64-softmmu" \
  --audio-drv-list=oss,alsa,sdl,esd \
  --enable-mixemu \
  --enable-vde \
  2>&1 | tee $OUTPUT/configure-${PRGNAM}.log

# The default configuration will cause 'make' to strip the binaries:
make $NUMJOBS 2>&1 | tee $OUTPUT/make-${PRGNAM}.log
make DESTDIR=$PKG install 2>&1 | tee $OUTPUT/install-${PRGNAM}.log
# Add a useful python script:
install -m0775 scripts/kvm/kvm_stat $PKG/usr/bin/kvm_stat

# Rename "qemu-system-x86_64" to "qemu-kvm" so that
# the regular "qemu" package won't overwrite it.
mv $PKG/usr/bin/qemu-system-x86_64 $PKG/usr/bin/qemu-kvm

# Rename the manual page too:
mv $PKG/usr/man/man1/{qemu,qemu-kvm}.1

# Preserve user modifications of this config file:
mv -i $PKG/etc/qemu/target-x86_64.conf{,.new}

# 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
}

config etc/qemu/target-x86_64.conf.new

# We installed a UDEV rule, so let's reload the ruleset:
if [ -x etc/rc.d/rc.udev ]; then
  chroot . /etc/rc.d/rc.udev reload
fi
EOINS

# Add a udev rules file so that members of the 'kvm' group can use the KVM:
mkdir -p $PKG/lib/udev/rules.d/
install -m644 $SRCDIR/65-kvm.rules $PKG/lib/udev/rules.d/65-kvm.rules

# 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 {} \;

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

# 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_}