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man: add a description of how manager env block is set

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Zbigniew Jędrzejewski-Szmek 2021-02-23 17:18:05 +01:00
parent 89b6acfd8e
commit d515864346
1 changed files with 21 additions and 4 deletions
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25
man/systemd.xml
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@ -609,6 +609,24 @@
<refsect1>
<title>Environment</title>
<para>The environment block for the system manager is initially set by the kernel. (In particular,
<literal>key=value</literal> assignments on the kernel command line are returned into environment
variables for PID 1). For the user manager, the system manager sets the environment as described in the
"Environment Variables in Spawned Processes" section of
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
<varname>DefaultEnvironment=</varname> setting in the system manager applies to all services including
<filename>user@.service</filename>. Additional entries may be configured (as for any other service)
through the <varname>Environment=</varname> and <varname>EnvironmentFile=</varname> settings for
<filename>user@.service</filename> (see
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). Also,
additional environment variables may be set through the <varname>ManagerEnvironment=</varname> setting in
<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
and
<citerefentry><refentrytitle>systemd-user.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
<para>Some of the variables understood by <command>systemd</command>:</para>
<variablelist class='environment-variables'>
<varlistentry>
<term><varname>$SYSTEMD_LOG_COLOR</varname></term>
@ -1090,12 +1108,11 @@
only the options described below are understood. Nevertheless, <command>systemd</command> is usually
started in this mode through the
<citerefentry><refentrytitle>user@.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
service, which is shared between all users, and it may be more convenient to use configuration files to
service, which is shared between all users. It may be more convenient to use configuration files to
modify settings (see
<citerefentry><refentrytitle>systemd-user.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>),
or a drop-in that specifies one of the environment variables listed above in the Environment section
(see the discussion of <varname>Environment=</varname> and <varname>EnvironmentFile=</varname> in
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>).</para>
or environment variables. See the "Environment" section above for a discussion of how the environment
block is set.</para>
<variablelist>
<varlistentry>