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<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
SPDX-License-Identifier: LGPL-2.1+
Copyright © 2016 Red Hat, Inc.
-->
<refentry id="environment.d" conditional='ENABLE_ENVIRONMENT_D'
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>environment.d</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>environment.d</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>environment.d</refname>
<refpurpose>Definition of user session environment</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>~/.config/environment.d/*.conf</filename></para>
<para><filename>/etc/environment.d/*.conf</filename></para>
<para><filename>/run/environment.d/*.conf</filename></para>
<para><filename>/usr/lib/environment.d/*.conf</filename></para>
<para><filename>/etc/environment</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>The <filename>environment.d</filename> directories contain a list of "global" environment
variable assignments for the user environment.
<citerefentry><refentrytitle>systemd-environment-d-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
parses them and updates the environment exported by the systemd user instance to the services it
starts.</para>
<para>It is recommended to use numerical prefixes for file names to simplify ordering.</para>
<para>For backwards compatibility, a symlink to <filename>/etc/environment</filename> is
installed, so this file is also parsed.</para>
</refsect1>
<xi:include href="standard-conf.xml" xpointer="confd" />
<refsect1>
<title>Configuration Format</title>
<para>The configuration files contain a list of
<literal><replaceable>KEY</replaceable>=<replaceable>VALUE</replaceable></literal> environment
variable assignments, separated by newlines. The right hand side of these assignments may
reference previously defined environment variables, using the <literal>${OTHER_KEY}</literal>
and <literal>$OTHER_KEY</literal> format. It is also possible to use
<literal>${<replaceable>FOO</replaceable>:-<replaceable>DEFAULT_VALUE</replaceable>}</literal>
to expand in the same way as <literal>${<replaceable>FOO</replaceable>}</literal> unless the
expansion would be empty, in which case it expands to <replaceable>DEFAULT_VALUE</replaceable>,
and use
<literal>${<replaceable>FOO</replaceable>:+<replaceable>ALTERNATE_VALUE</replaceable>}</literal>
to expand to <replaceable>ALTERNATE_VALUE</replaceable> as long as
<literal>${<replaceable>FOO</replaceable>}</literal> would have expanded to a non-empty value.
No other elements of shell syntax are supported.</para>
<para>Each <replaceable>KEY</replaceable> must be a valid variable name. Empty lines
and lines beginning with the comment character <literal>#</literal> are ignored.</para>
<refsect2>
<title>Example</title>
<example>
<title>Setup environment to allow access to a program installed in
<filename noindex='true'>/opt/foo</filename></title>
<para><filename>/etc/environment.d/60-foo.conf</filename>:
</para>
<programlisting>
FOO_DEBUG=force-software-gl,log-verbose
PATH=/opt/foo/bin:$PATH
LD_LIBRARY_PATH=/opt/foo/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
XDG_DATA_DIRS=/opt/foo/share:${XDG_DATA_DIRS:-/usr/local/share/:/usr/share/}
</programlisting>
</example>
</refsect2>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-environment-d-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.environment-generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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