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man: Add a note about what environment variables are available by default

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Zbigniew Jędrzejewski-Szmek 2013-09-12 09:29:01 -04:00
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commit f4ae69117b
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man/systemd.exec.xml
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@ -76,6 +76,27 @@
configuration options are configured in the [Service],
[Socket], [Mount], or [Swap] sections, depending on the unit
type.</para>
<para>Processes started by the system systemd instance
are executed in a clean environment in which only the
<varname>$PATH</varname> and <varname>$LANG</varname>
variables are set by default. In order to add
additional variables, see the
<varname>Environment=</varname> and
<varname>EnvironmentFile=</varname> options below. To
specify variables globally, see
<varname>DefaultEnvironment=</varname> in
<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
or the kernel option
<varname>systemd.setenv=</varname> in
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>. Processes
started by the user systemd instances inherit all
environment variables from the user systemd instance,
and have <varname>$HOME</varname>,
<varname>$USER</varname>,
<varname>$XDG_RUNTIME_DIR</varname> defined, among
others. In addition, <varname>$MANAGERPID</varname>
contains the PID of the user systemd instance.</para>
</refsect1>
<refsect1>