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man: document new userdbd features

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Lennart Poettering 2021-05-07 12:17:57 +02:00
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18
man/systemd-userdbd.service.xml
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@ -32,7 +32,9 @@
<para><command>systemd-userdbd</command> is a system service that multiplexes user/group lookups to all
local services that provide JSON user/group record definitions to the system. In addition it synthesizes
JSON user/group records from classic UNIX/glibc NSS user/group records in order to provide full backwards
compatibility.</para>
compatibility. It may also pick up statically defined JSON user/group records from drop-in files in
<filename>/etc/userdb/</filename>, <filename>/run/userdb/</filename>,
<filename>/run/host/userdb/</filename> and <filename>/use/lib/userdb/</filename>.</para>
<para>Most of <command>systemd-userdbd</command>'s functionality is accessible through the
<citerefentry><refentrytitle>userdbctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
@ -45,16 +47,18 @@
multiplexes access other services implementing this API, too. It is thus both server and client of this
API.</para>
<para>This service provides two distinct <ulink url="https://varlink.org/">Varlink</ulink> services:
<para>This service provides three distinct <ulink url="https://varlink.org/">Varlink</ulink> services:
<constant>io.systemd.Multiplexer</constant> provides a single, unified API for querying JSON user and
group records. Internally it talks to all other user/group record services running on the system in
parallel and forwards any information discovered. This simplifies clients substantially since they need
to talk to a single service only instead of all of them in
parallel. <constant>io.systemd.NameServiceSwitch</constant> provides compatibility with classic UNIX/glibc
NSS user records, i.e. converts <type>struct passwd</type> and <type>struct group</type> records as
acquired with APIs such as <citerefentry
project='man-pages'><refentrytitle>getpwnam</refentrytitle><manvolnum>1</manvolnum></citerefentry> to JSON
user/group records, thus hiding the differences between the services as much as possible.</para>
parallel. <constant>io.systemd.NameServiceSwitch</constant> provides compatibility with classic
UNIX/glibc NSS user records, i.e. converts <type>struct passwd</type> and <type>struct group</type>
records as acquired with APIs such as <citerefentry
project='man-pages'><refentrytitle>getpwnam</refentrytitle><manvolnum>1</manvolnum></citerefentry> to
JSON user/group records, thus hiding the differences between the services as much as
possible. <constant>io.systemd.Dropin</constant> makes JSON user/group records from the aforementioned
drop-in directories available.</para>
</refsect1>
<refsect1>