repository=$1
-merge_rev=`sed 1q MERGE`
+old_rev=`sed 1q MERGE`
rm -rf ${OLDDIR}
-hg clone -r ${merge_rev} ${repository} ${OLDDIR}
+hg clone -r ${old_rev} ${repository} ${OLDDIR}
rm -rf ${NEWDIR}
-hg clone ${repository} ${NEWDIR}
+hg clone -u release ${repository} ${NEWDIR}
new_rev=`cd ${NEWDIR} && hg log | sed 1q | sed -e 's/.*://'`