#!/bin/sh
#
# Fix the SPEC of a package submitted for official Mandriva bugfix updates:
# - currently must be run in the correct environment (chroot)
# - original SRPM is untouched
# - sets subrel if package doesn't have it defined
# - increases subrel if package already has it defined
# - adds changelog entry with correct E-V-R and boilerplate "- build for updates"
# - works on tempdir, cleaned up at end
# - final SRPM is put on current dir
#

AUTHOR="Oden Eriksson <oe@nux.se>"
CL_MSG="- rebuild"

usage() {
cat <<FIN

$0 [-c] [-a "author" ] [-m "changelog message"] foo.src.rpm

Options:
-c : changelog only
-m : changelog message
-a : author

FIN
}

export LC_ALL=C

while [ "$1" ]; do
  case "$1" in
    *.rpm) RPM="$1"; shift ;;
    -m) CL_MSG="$2"; shift 2 ;;
    -a) AUTHOR="$2"; shift 2 ;;
    -c) CL_ONLY=1; shift ;;
  esac
done

if [ -z "$RPM" ]; then
  usage
  exit 1
fi

TOPDIR="`mktemp -d`" || exit 1
( cd "$TOPDIR" && mkdir SPECS SOURCES BUILD RPMS SRPMS ) || exit 1

rpm --nodeps --define "_topdir $TOPDIR" -i "$RPM"

pushd "$TOPDIR" || exit 1

SPEC="`find SPECS -name \*.spec`"

SUBREL="`egrep -c '[[:space:]]*%define[[:space:]]+subrel[[:space:]]' $SPEC`"

cp -vi $SPEC $SPEC.bak

if [ ! "$CL_ONLY" ]; then
  if [ $SUBREL -eq 0 ]; then
    NEWSUBREL=1
    awk -v NEWSUBREL=$NEWSUBREL '/[^%]%mkrel/ && !done { print "%define subrel "NEWSUBREL; done=1 } { print }' "$SPEC.bak" >"$SPEC"
  elif [ $SUBREL -eq 1 ]; then
    NEWSUBREL="`sed -e '/%define[ \\t]\\+subrel/!d; s/[ \\t]*%define[ \\t]\\+subrel[ \\t]\\+//' <$SPEC.bak`"
    NEWSUBREL=$(($NEWSUBREL+1))
    sed -e "/%define[ \\t]\+subrel/s/\\(^[ \\t]*%define[ \\t]\\+subrel[ \\t]\\+\\)[0-9]\+/\1$NEWSUBREL/" <"$SPEC.bak" >"$SPEC"
  else
    echo "Bad SRPM: Multiple subrel definitions."
    exit 1
  fi
fi

EVR="`rpm -q --qf '%{EPOCH}:%{VERSION}-%{RELEASE}\n' --specfile $SPEC 2>/dev/null | sed -e '2,$d; s/^(none)://'`"

awk -v AUTHOR="$AUTHOR" -v EVR="$EVR" -v CL_MSG="$CL_MSG" '
  /^%changelog/ {
    print;
    print strftime("* %a %b %d %Y "AUTHOR" "EVR);
    print CL_MSG;
    print "" }
  ! /^%changelog/{
    print
  }' \
  "$SPEC" >"$SPEC.new"

mv -fv "$SPEC.new" "$SPEC"
diff -u "$SPEC.bak" "$SPEC"
SRPM="`rpmbuild --nodeps --define "_topdir $TOPDIR" --nodeps -bs "$SPEC" | sed 's/^Wrote: //'`"
popd
mv -i "$SRPM" .
rm -rf "$TOPDIR"
SRPM="./`basename $SRPM`"
echo "$SRPM"