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#! /bin/bash
#   pbuilder -- personal Debian package builder
#   Copyright (C) 2001,2002 Junichi Uekawa
#
#   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 2 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, write to the Free Software
#   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

export LANG=C
export LC_ALL=C
set -e 

function copydsc () {
    local DSCFILE="$1"
    local TARGET="$2"
    for FILE in \
      "$DSCFILE" \
	$(cat "$DSCFILE" | \
	awk 'BEGIN{p=0} /^$/ {p=0} {if (p){print "'$(dirname "$DSCFILE")'/" $3}} /^Files:/{p=1}' ) ; do
	echo "    -> copying [$FILE]"
        cp "$FILE" "$TARGET" ;
    done
}

function checkbuilddep_versiondeps () {
    local PACKAGE="$1"
    local COMPARESTRING="$2"
    local DEPSVERSION="$3"
    local PACKAGEVERSION=$($CHROOTEXEC usr/bin/apt-cache show $PACKAGE | grep "^Version:" | sort | head -1 | sed 's/^Version: \(.*\)$/\1/')
    # no versioned provides.
    if dpkg --compare-versions "$PACKAGEVERSION" "$COMPARESTRING" "$DEPSVERSION"; then
	# satisfies depends
	return 0;
    else
	# cannot satisfy depends
	return 1;
    fi
}

function checkbuilddep_archdeps () {
    # returns FALSE on INSTALL
    local INSTALLPKG="$1"
    local ARCH="$2"
    if echo "$INSTALLPKG" | sed 's/.*\(\[.*\]\)/\1/' | grep "[[/][!]$ARCH[]/]" > /dev/null; then
	# if !$ARCH exists in there, ERROR.
	return 0;
    fi
    if ! echo "$INSTALLPKG" | sed 's/.*\(\[.*\]\)/\1/' | grep "[!]" > /dev/null; then
	if ! echo "$INSTALLPKG" | sed 's/.*\(\[.*\]\)/\1/' | grep "[[/]$ARCH[]/]" > /dev/null; then
	# if $ARCH does not exist, ERROR.
	    return 0;
	fi
    fi
    return 1;
}

function checkbuilddep_provides () {
    local PACKAGENAME="$1"
    # PROVIDED needs to be used outside of this function.
    PROVIDED=$($CHROOTEXEC usr/bin/apt-cache showpkg $PACKAGENAME | awk '{p=0}/^Reverse Provides:/,/^$/{p=1}{if(p && ($0 !~ "Reverse Provides:")){PACKAGE=$1}} END{print PACKAGE}')
}

function checkbuilddep_internal () {
# Use this function to fulfill the dependency (almost)
    local ARCH=$(dpkg --print-architecture)
    local INSTALLPKG
    local INSTALLPKGMULTI
    local CURRENTREALPKGNAME
    echo " -> Attempting to parse the build-deps by myself"
    for INSTALLPKGMULTI in $(cat "$BUILDPLACE/"tmp/buildd/*/debian/control | \
	awk '/^[^ ]*:/{p=0} tolower($0) ~ /^build-depends:/{p=1} tolower($0) ~  /^build-depends-indep:/{p=1}  {if(p) {print $0}}'  | \
	sed 's/^[^:]*: //' | \
	tr " " "/" | \
	awk 'BEGIN{RS=","} {print}'); do
      echo " -> Considering "$(echo $INSTALLPKGMULTI | tr "/" " " | awk '{print $0}' )
      SATISFIED="no"
      for INSTALLPKG in $(echo "$INSTALLPKGMULTI" | \
	  awk 'BEGIN{RS="|"} {print}'); do
	CURRENTREALPKGNAME=$(echo "$INSTALLPKG" | sed -e 's/^[/]*//' -e 's/[[/(].*//')
	if echo "$INSTALLPKG" | grep '\[' > /dev/null ; then
	    if checkbuilddep_archdeps "$INSTALLPKG" "$ARCH"; then
		SATISFIED="yes"
		echo "   -> This package is not for this architecture"
		continue;
	    fi
	fi
	if echo "$INSTALLPKG" | grep '[(]' > /dev/null; then
	    #echo "Debug: $INSTALLPKG"
	    if ! checkbuilddep_versiondeps ${CURRENTREALPKGNAME} \
		$(echo "$INSTALLPKG" | tr "/" " " | sed 's/^.*(\(<<\|<=\|>=\|=\|<\|>>\|>\)[ ]*\(.*\)).*$/\1/') \
		$(echo "$INSTALLPKG" | tr "/" " " | sed 's/^.*(\(<<\|<=\|>=\|=\|<\|>>\|>\)[ ]*\(.*\)).*$/\2/') ; then
	      echo "   -> Does not satisfy version, not trying"
	      continue;
	    fi
	fi
	echo " -> Installing "${CURRENTREALPKGNAME}

	if $CHROOTEXEC usr/bin/apt-get -y install ${CURRENTREALPKGNAME}; then
	    SATISFIED="yes"
	else
	    # package could not be found. -- looking for alternative.
	    PROVIDED=""
	    checkbuilddep_provides ${CURRENTREALPKGNAME}
	    if [ -n "$PROVIDED" ]; then
		# something provides this package
		echo "   -> Installing $PROVIDED to satisfy the dependency "
		if $CHROOTEXEC usr/bin/apt-get -y install $PROVIDED; then
		    SATISFIED="yes";
		fi
	    fi
	fi
	if [ "$SATISFIED" = "yes" ]; then
	    break;
	fi
      done;
      if [ "$SATISFIED" = "no" ]; then
	  echo "E: pbuilder: Could not satisfy build-dependency." >&2
	  saveaptcache_umountproc_cleanbuildplace
	  exit 1
      fi
    done;

    # start processing build-conflicts.
    for INSTALLPKG in $(cat "$BUILDPLACE/"tmp/buildd/*/debian/control | \
	awk '/^[^ ]*:/{p=0} tolower($0) ~ /^build-conflicts:/{p=1} tolower($0) ~ /^build-conflicts-indep:/{p=1}  {if(p) {print $0}}'  | \
	sed 's/^[^:]*: //' | \
	tr " " "/" | \
	awk 'BEGIN{RS=","} {print}'); do
      CURRENTREALPKGNAME=$(echo "$INSTALLPKG" | sed -e 's/^[/]*//' -e 's/[[/(].*//')
      echo " -> Considering "${CURRENTREALPKGNAME}
      
      if echo "$INSTALLPKG" | grep '\[' > /dev/null ; then
	  # this package has arch-conflicts.
	  if checkbuilddep_archdeps "$INSTALLPKG" "$ARCH"; then
	      echo "I: Ignoring other-arch"
	      continue;
	  fi
      fi
      if echo "$INSTALLPKG" | grep '[(]' > /dev/null ; then
	  # this package has version-conflicts
	  if ! checkbuilddep_versiondeps ${CURRENTREALPKGNAME} \
		$(echo "$INSTALLPKG" | tr "/" " " | sed 's/^.*(\(<<\|<=\|>=\|=\|<\|>>\|>\)[ ]*\(.*\)).*$/\1/') \
		$(echo "$INSTALLPKG" | tr "/" " " | sed 's/^.*(\(<<\|<=\|>=\|=\|<\|>>\|>\)[ ]*\(.*\)).*$/\2/'); then
	      echo "I: Satisfies version, not trying"
	      continue;
	  fi
      fi

      # if package exists, remove it.
      if $CHROOTEXEC usr/bin/dpkg -s $(echo "$INSTALLPKG" | tr "/" " " | awk '{print $1}') 2>&1 | grep ^Package: > /dev/null; then
	  if ! $CHROOTEXEC usr/bin/apt-get -y remove ${CURRENTREALPKGNAME} ; then
	      echo "E: Could not satisfy build-conflicts" >&2
	      saveaptcache_umountproc_cleanbuildplace
	      exit 1
	  fi
      else
	  echo "I: This package is not installed."
      fi
    done
}

function checkbuilddep () {
    checkbuilddep_internal
}

function echobacktime () {
    echo "Current time: $(date)"
    echo "pbuilder-time-stamp: $(date +%s)"
}

function showbuildbanner () {
    # show some banners for building
    echo "pbuilder-buildpackage/"$(dpkg --print-architecture) '$Id$'
    echo
}

function saveaptcache_umountproc_cleanbuildplace () {
    # save the apt cache, and call umountproc_cleanbuildplace
    save_aptcache
    umountproc_cleanbuildplace
}


. /usr/lib/pbuilder/pbuilder-checkparams

PACKAGENAME="$1"
CHROOTEXEC="chroot $BUILDPLACE "

if [ ! -f "$PACKAGENAME" ]; then
    echo "Command line parameter [$PACKAGENAME] is not a valid .dsc file name" >&2
    exit 1;
fi;

showbuildbanner
echobacktime

extractbuildplace 

echo Copying source file
copydsc "$PACKAGENAME" "$BUILDPLACE/tmp/buildd"
echo Extracting source
if ! $CHROOTEXEC /bin/bash -c "( cd tmp/buildd; /usr/bin/dpkg-source -x $(basename $PACKAGENAME) )"; then
    echo pbuilder: Failed extracting the source >&2 
    umountproc_cleanbuildplace
    exit 1;
fi

recover_aptcache
echo "Installing the build-deps"
checkbuilddep
save_aptcache

echo " -> Building the package"
export PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin"

if [ -z "$DEBEMAIL" ]; then
    if ! $CHROOTEXEC /bin/bash -c "cd tmp/buildd/*/;  dpkg-buildpackage -us -uc $DEBBUILDOPTS"; then
	echo "pbuilder: Failed autobuilding of package" >&2
	umountproc_cleanbuildplace
	exit 1;    
    fi
else
    if ! $CHROOTEXEC /bin/bash -c "cd tmp/buildd/*/;  dpkg-buildpackage -us -uc  \"-m$DEBEMAIL\" $DEBBUILDOPTS"; then
	echo "pbuilder: Failed autobuilding of package" >&2
	umountproc_cleanbuildplace
	exit 1;    
    fi
fi

umountproc

if [ -n "$BUILDRESULT" ]; then
    mkdir -p "$BUILDRESULT"
    if [ -d "$BUILDRESULT" ]; then
	cp "$BUILDPLACE"/tmp/buildd/* "$BUILDRESULT" 2>/dev/null || true
    else
	echo "E: BUILDRESULT=[$BUILDRESULT] is not a directory." >&2
    fi
fi

cleanbuildplace

echobacktime