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#!/usr/bin/env bash

DESTDIR="${DESTDIR:-/}"
pkglibdir="${pkglibdir:-/usr/lib/rpm}"

RPMRC="${1:-rpmrc}"
MACROS="${2:-macros}"
PLATFORM="${3:-platform}"

if grep /share/ $PLATFORM > /dev/null 2>&1 ; then
    DEFAULTDOCDIR='%{_usr}/share/doc'
else
    DEFAULTDOCDIR='%{_usr}/doc'
fi

TEMPRC="/tmp/rpmrc.$$"
cat << E_O_F > $TEMPRC
include:	$RPMRC
macrofiles:	$MACROS
E_O_F

RPM="./rpm --rcfile $TEMPRC"

canonarch_sed='s_i.86_i386_;s_athlon_i386_;s_sparc[^-]*_sparc_;s_alpha[^-]*_alpha_;s_\(powerpc\|ppc\)[^-]*_ppc_'
arch="`$RPM --eval '%{_arch}'|sed -e "$canonarch_sed"`"
VENDOR="`$RPM --eval '%{_vendor}'`"
OS="`$RPM --eval '%{_os}'`"
RPMRC_GNU="`$RPM --eval '%{_gnu}'`"
target_platform="`$RPM --eval '%{?_gnu:%undefine _gnu}%{_target_platform}'|sed -e "$canonarch_sed"`"
target="`$RPM --eval '%{_target}'|sed -e "$canonarch_sed"`"

case "$arch" in
  i[3456]86|athlon) SUBSTS='s_i386_i386_ s_i386_i486_ s_i386_i586_ s_i386_i686_ s_i386_athlon_' ;;
  alpha*) SUBSTS='s_alpha_alpha_ s_alpha_alphaev5_ s_alpha_alphaev56_ s_alpha_alphapca56_ s_alpha_alphaev6_ s_alpha_alphaev67_' ;;
  sparc*) SUBSTS='s_sparc\(64\|v9\)_sparc_ s_sparc64_sparcv9_;s_sparc\([^v]\|$\)_sparcv9\1_ s_sparcv9_sparc64_;s_sparc\([^6]\|$\)_sparc64\1_' ;;
  powerpc*|ppc*) SUBSTS='s_ppc64_ppc_ s_ppc\([^6ip]\|$\)_ppc64\1_ s_ppc\([^6ip]\|$\)_ppciseries_ s_ppc\([^6ip]\|$\)_ppcpseries_ s_ppc\([^6ip]\|$\)_ppc64iseries_ s_ppc\([^6ip]\|$\)_ppc64pseries_' ;;
  s390*) SUBSTS='s_s390x_s390_ s_s390\([^x]\|$\)_s390x\1_' ;;
  *) SUBSTS=y___ ;;
esac

for SUBST in $SUBSTS ; do
  ARCH=`echo $arch | sed -e $SUBST`
  TARGET_PLATFORM=`echo $target_platform | sed -e $SUBST`
  TARGET=`echo $target | sed -e $SUBST`
  LIB=lib

  PPD="${DESTDIR}/${pkglibdir}/${ARCH}-${OS}"

  [ -d $PPD ] || mkdir $PPD

  RPMRC_OPTFLAGS="`sed -n 's/^optflags: '$ARCH' //p' $RPMRC`"
  RPMRC_OPTFLAGS="`echo $RPMRC_OPTFLAGS | sed -e 's, ,\ ,g'`"
  case $RPMRC_OPTFLAGS in
  *-g*) ;;
  *) RPMRC_OPTFLAGS="$RPMRC_OPTFLAGS -g" ;;
  esac

  ARCH_INSTALL_POST='%{nil}'
  MULTILIBNO=
  case "${ARCH}-${OS}" in
    sparc-linux) MULTILIBNO=1 ;;
    sparcv9-linux) MULTILIBNO=1 ;;
    sparc64-linux) ARCH_INSTALL_POST=${pkglibdir}/brp-sparc64-linux; LIB=lib64; MULTILIBNO=2 ;;
    s390-linux) MULTILIBNO=1 ;;
    s390x-linux) LIB=lib64; MULTILIBNO=2 ;;
    ppc-linux) MULTILIBNO=1 ;;
    ppc64-linux) LIB=lib64; MULTILIBNO=2 ;;
    i?86-linux|athlon-linux) MULTILIBNO=1 ;;
    x86_64-linux) LIB=lib64; MULTILIBNO=2 ;;
  esac

  if [ -n "$MULTILIBNO" ]; then
    MULTILIBSED='-e /^@MULTILIB/d -e s,@MULTILIBNO@,'$MULTILIBNO,
  else
    MULTILIBSED='-e /^@MULTILIBSTART@/,/^@MULTILIBEND@/d'
  fi

  case $VENDOR in
  yellowdog)
    VENDORSED='-e s,^@yellowdog@,,'
    ;;
  pld)
    VENDORSED='-e s,^@pld@,,'
    RPMRC_OPTFLAGS="`echo $RPMRC_OPTFLAGS | sed -e "s/ -g/ /"`"
    ;;
  mandrake)
    VENDORSED='-e s,^@mandrake@,,'
    RPMRC_OPTFLAGS="`echo $RPMRC_OPTFLAGS | sed -e s/i386/i686/`"
    ;;
  conectiva)
    VENDORSED='-e s,^@conectiva@,,'
    ;;
  redhat)
    VENDORSED='-e s,^@redhat@,,'
    ;;
  esac

  cat $PLATFORM \
  | sed -e "s,@RPMRC_OPTFLAGS@,$RPMRC_OPTFLAGS," \
	-e "s,@RPMRC_ARCH@,$ARCH," \
	-e "s,@RPMRC_GNU@,$RPMRC_GNU," \
	-e "s,@LIB@,$LIB," \
	-e "s,@ARCH_INSTALL_POST@,$ARCH_INSTALL_POST," \
	-e "s,@DEFAULTDOCDIR@,$DEFAULTDOCDIR," \
	-e '/\${\w*:-/!s,\${,%{_,' \
	$MULTILIBSED \
	$VENDORSED \
  | grep -v '^@' \
  > ${PPD}/macros

done

{ cd ${DESTDIR}/${pkglibdir}
  [ -L noarch-${OS} ] && rm -f noarch-${OS} 2>/dev/null
  mkdir -p noarch-${OS}
  sed -e "/^%_arch/s,${arch},noarch," ${arch}-${OS}/macros | grep -v '^%optflags' > noarch-${OS}/macros
#  [ -d ${VENDOR} ] || mkdir ${VENDOR}
#  for i in brp-* find-lang.sh find-provides find-requires perl.prov perl.req
#  do
#    sed -e "s,/usr/lib/rpm,/usr/lib/rpm/${VENDOR},g" < $i > ${VENDOR}/$i
#    chmod +x ${VENDOR}/$i
#  done
##  chmod -x ${VENDOR}/perl.req
#  echo "macrofiles:     /usr/lib/rpm/macros:/usr/lib/rpm/${VENDOR}/macros:/etc/rpm/macros.specspo:/etc/rpm/macros.cdb" > ${VENDOR}/rpmrc
#  sed -e "s,/usr/lib/rpm,/usr/lib/rpm/${VENDOR},g" < ${arch}-${OS}/macros | grep -v '^%(_arch|optflags)' > ${VENDOR}/macros
}

rm $TEMPRC