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_user=mastodon _homedir=/var/lib/mastodon _shell=/bin/false post_install() { getent group ${_user} > /dev/null || groupadd ${_user} > /dev/null getent passwd ${_user} > /dev/null || useradd -d ${_homedir} -g ${_user} -s ${_shell} ${_user} > /dev/null }