transaction: use 'util.copyfile' for creating backup Using 'copyfile' (single file) instead of 'copyfiles' (tree) will ensures destination file will be overwritten. This will prevent some abort if backup file are left in place for random reason. It also seems more correct.

FROM centos:centos5
RUN yum install -y gcc make rpm-build gettext tar
RUN yum install -y python-devel python-docutils
# For creating repo meta data
RUN yum install -y createrepo
RUN yum install -y readline-devel openssl-devel ncurses-devel zlib-devel bzip2-devel