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pre_install() { if ! getent passwd datomic >/dev/null; then useradd -r -d /var/lib/datomic -s /usr/bin/nologin datomic fi } post_install() { chown -R datomic:datomic /var/lib/datomic chown -R datomic:datomic /var/log/datomic } pre_upgrade() { pre_install } post_upgrade() { post_install } post_remove() { userdel datomic }