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journalctl: Make journalctl --user-unit= match on _SYSTEMD_USER_SLICE
journalctl --unit= already did this, and allows you to tail all the logs for a certain slice easily. It seemed only natural to make --user-unit behave in a similar way. The _SYSTEMD_USER_SLICE field was not documented as being added by journald, so I have added that to the documentation too. Furthermore, I have documented the existing behaviour of --unit= and the new behaviour of --user-unit= The behaviour was actually not documented before, so I am also OK with removing the match for the --unit= command instead. The user would then have to manually provide _SYSTEMD_SLICE= filter to journalctl in both cases. Both options work for me.
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@ -544,7 +544,12 @@
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the unit
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(<literal>_SYSTEMD_UNIT=<replaceable>UNIT</replaceable></literal>),
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along with additional matches for messages from systemd and
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messages about coredumps for the specified unit.</para>
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messages about coredumps for the specified unit. A match
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is also added for <literal>_SYSTEMD_SLICE=<replaceable>UNIT</replaceable></literal>,
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such that if the provided <replaceable>UNIT</replaceable> is a
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<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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unit, all logs of the children of the slice will be logged.
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</para>
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<para>This parameter can be specified multiple times.</para>
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</listitem>
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@ -558,7 +563,11 @@
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(<literal>_SYSTEMD_USER_UNIT=</literal> and
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<literal>_UID=</literal>) and additional matches for messages
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from session systemd and messages about coredumps for the
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specified unit.</para>
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specified unit. A match
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is also added for <literal>_SYSTEMD_USER_SLICE=<replaceable>UNIT</replaceable></literal>,
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such that if the provided <replaceable>UNIT</replaceable> is a
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<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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unit, all logs of the children of the unit will be logged.</para>
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<para>This parameter can be specified multiple times.</para>
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</listitem>
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@ -188,6 +188,7 @@
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<term><varname>_SYSTEMD_SLICE=</varname></term>
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<term><varname>_SYSTEMD_UNIT=</varname></term>
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<term><varname>_SYSTEMD_USER_UNIT=</varname></term>
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<term><varname>_SYSTEMD_USER_SLICE=</varname></term>
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<term><varname>_SYSTEMD_SESSION=</varname></term>
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<term><varname>_SYSTEMD_OWNER_UID=</varname></term>
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@ -1539,7 +1539,8 @@ static int get_possible_units(
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"_SYSTEMD_USER_UNIT\0" \
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"USER_UNIT\0" \
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"COREDUMP_USER_UNIT\0" \
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"OBJECT_SYSTEMD_USER_UNIT\0"
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"OBJECT_SYSTEMD_USER_UNIT\0" \
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"_SYSTEMD_USER_SLICE\0"
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static int add_units(sd_journal *j) {
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_cleanup_strv_free_ char **patterns = NULL;
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