#!/bin/bash

oldpwd="$(pwd)"
thetmpdir="/tmp/remove_me"
attachmentid=215326

mkdir "${thetmpdir}"
cd "${thetmpdir}"

eval "$( emerge --info | egrep '^PORTDIR=|^PORTAGE_TMPDIR=' \
  | sed 's/^\(.*\)=/\L\1=/')"

ebuild "${portdir}/sys-libs/gdbm/gdbm-1.8.3-r3.ebuild" install \
&& gdbmtmp="${portage_tmpdir}/portage/sys-libs/gdbm-1.8.3-r3" \
&& cp "${gdbmtmp}/image/usr/lib/libgdbm.a" . || { echo something bad happend.; exit 1 ; }

ebuild "${portdir}/sys-libs/gdbm/gdbm-1.8.3-r3.ebuild" clean

wget -S -O converter.c "http://bugs.gentoo.org/attachment.cgi?id=${attachmentid}" \
&& gcc converter.c -o converter libgdbm.a -ldl \
&& find /etc /var -type f -exec file {} + \
   | grep 'GNU dbm 1.x or ndbm database' \
   | sed 's/:.*$//' | while read f ; do 
     echo converting "$f"
     ./converter "$f" || { echo sorry, converting "$f" failed; break; }
     echo "Successful.  You may wish to remove "${f}.upgrade.tmp"
   done

cd "${oldpwd}"

echo "You may wish to remove ${thetmpdir}"
echo "If conversion was successful, it serves no further purpose."