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post_install(){ /usr/bin/getent group viper > /dev/null || /usr/sbin/groupadd viper /usr/bin/getent passwd viper > /dev/null || \ /usr/bin/useradd -d /opt/viper -g viper -s /usr/bin/nologin viper chmod 770 /opt/viper chown -R viper:viper /opt/viper chmod g+s /opt/viper } post_upgrade(){ post_install }