mirror of
https://github.com/systemd/systemd-stable.git
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11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
113 lines
4.3 KiB
XML
113 lines
4.3 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2016 Red Hat, Inc.
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Copyright 2017 Zbigniew Jędrzejewski-Szmek
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-->
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<refentry id="environment.d" conditional='ENABLE_ENVIRONMENT_D'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>environment.d</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Ray</firstname>
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<surname>Strode</surname>
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<email>rstrode@redhat.com</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>environment.d</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>environment.d</refname>
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<refpurpose>Definition of user session environment</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>~/.config/environment.d/*.conf</filename></para>
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<para><filename>/etc/environment.d/*.conf</filename></para>
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<para><filename>/run/environment.d/*.conf</filename></para>
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<para><filename>/usr/lib/environment.d/*.conf</filename></para>
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<para><filename>/etc/environment</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>The <filename>environment.d</filename> directories contain a list of "global" environment
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variable assignments for the user environment.
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<citerefentry><refentrytitle>systemd-environment-d-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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parses them and updates the environment exported by the systemd user instance to the services it
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starts.</para>
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<para>It is recommended to use numerical prefixes for file names to simplify ordering.</para>
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<para>For backwards compatibility, a symlink to <filename>/etc/environment</filename> is
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installed, so this file is also parsed.</para>
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</refsect1>
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<xi:include href="standard-conf.xml" xpointer="confd" />
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<refsect1>
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<title>Configuration Format</title>
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<para>The configuration files contain a list of
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<literal><replaceable>KEY</replaceable>=<replaceable>VALUE</replaceable></literal> environment
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variable assignments, separated by newlines. The right hand side of these assignments may
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reference previously defined environment variables, using the <literal>${OTHER_KEY}</literal>
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and <literal>$OTHER_KEY</literal> format. It is also possible to use
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<literal>${<replaceable>FOO</replaceable>:-<replaceable>DEFAULT_VALUE</replaceable>}</literal>
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to expand in the same way as <literal>${<replaceable>FOO</replaceable>}</literal> unless the
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expansion would be empty, in which case it expands to <replaceable>DEFAULT_VALUE</replaceable>,
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and use
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<literal>${<replaceable>FOO</replaceable>:+<replaceable>ALTERNATE_VALUE</replaceable>}</literal>
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to expand to <replaceable>ALTERNATE_VALUE</replaceable> as long as
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<literal>${<replaceable>FOO</replaceable>}</literal> would have expanded to a non-empty value.
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No other elements of shell syntax are supported.</para>
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<para>Each <replaceable>KEY</replaceable> must be a valid variable name. Empty lines
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and lines beginning with the comment character <literal>#</literal> are ignored.</para>
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<refsect2>
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<title>Example</title>
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<example>
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<title>Setup environment to allow access to a program installed in
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<filename noindex='true'>/opt/foo</filename></title>
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<para><filename>/etc/environment.d/60-foo.conf</filename>:
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</para>
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<programlisting>
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FOO_DEBUG=force-software-gl,log-verbose
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PATH=/opt/foo/bin:$PATH
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LD_LIBRARY_PATH=/opt/foo/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
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XDG_DATA_DIRS=/opt/foo/share:${XDG_DATA_DIRS:-/usr/local/share/:/usr/share/}
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</programlisting>
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</example>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-environment-d-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.environment-generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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