mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-12-23 17:34:00 +03:00
3a54a15760
The "include" files had type "book" for some raeason. I don't think this is meaningful. Let's just use the same everywhere. $ perl -i -0pe 's^..DOCTYPE (book|refentry) PUBLIC "-//OASIS//DTD DocBook XML V4.[25]//EN"\s+"http^<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"\n "http^gms' man/*.xml
372 lines
16 KiB
XML
372 lines
16 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
||
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
||
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
||
<!-- SPDX-License-Identifier: LGPL-2.1+ -->
|
||
|
||
<refentry id="os-release">
|
||
<refentryinfo>
|
||
<title>os-release</title>
|
||
<productname>systemd</productname>
|
||
</refentryinfo>
|
||
|
||
<refmeta>
|
||
<refentrytitle>os-release</refentrytitle>
|
||
<manvolnum>5</manvolnum>
|
||
</refmeta>
|
||
|
||
<refnamediv>
|
||
<refname>os-release</refname>
|
||
<refpurpose>Operating system identification</refpurpose>
|
||
</refnamediv>
|
||
|
||
<refsynopsisdiv>
|
||
<para><filename>/etc/os-release</filename></para>
|
||
<para><filename>/usr/lib/os-release</filename></para>
|
||
</refsynopsisdiv>
|
||
|
||
<refsect1>
|
||
<title>Description</title>
|
||
|
||
<para>The <filename>/etc/os-release</filename> and
|
||
<filename>/usr/lib/os-release</filename> files contain operating
|
||
system identification data.</para>
|
||
|
||
<para>The basic file format of <filename>os-release</filename> is
|
||
a newline-separated list of environment-like shell-compatible
|
||
variable assignments. It is possible to source the configuration
|
||
from shell scripts, however, beyond mere variable assignments, no
|
||
shell features are supported (this means variable expansion is
|
||
explicitly not supported), allowing applications to read the file
|
||
without implementing a shell compatible execution engine. Variable
|
||
assignment values must be enclosed in double or single quotes if
|
||
they include spaces, semicolons or other special characters
|
||
outside of A–Z, a–z, 0–9. Shell special characters ("$", quotes,
|
||
backslash, backtick) must be escaped with backslashes, following
|
||
shell style. All strings should be in UTF-8 format, and
|
||
non-printable characters should not be used. It is not supported
|
||
to concatenate multiple individually quoted strings. Lines
|
||
beginning with "#" shall be ignored as comments. Blank lines are
|
||
permitted and ignored.</para>
|
||
|
||
<para>The file <filename>/etc/os-release</filename> takes
|
||
precedence over <filename>/usr/lib/os-release</filename>.
|
||
Applications should check for the former, and exclusively use its
|
||
data if it exists, and only fall back to
|
||
<filename>/usr/lib/os-release</filename> if it is missing.
|
||
Applications should not read data from both files at the same
|
||
time. <filename>/usr/lib/os-release</filename> is the recommended
|
||
place to store OS release information as part of vendor trees.
|
||
<filename>/etc/os-release</filename> should be a relative symlink
|
||
to <filename>/usr/lib/os-release</filename>, to provide
|
||
compatibility with applications only looking at
|
||
<filename>/etc</filename>. A relative symlink instead of an
|
||
absolute symlink is necessary to avoid breaking the link in a
|
||
chroot or initrd environment such as dracut.</para>
|
||
|
||
<para><filename>os-release</filename> contains data that is
|
||
defined by the operating system vendor and should generally not be
|
||
changed by the administrator.</para>
|
||
|
||
<para>As this file only encodes names and identifiers it should
|
||
not be localized.</para>
|
||
|
||
<para>The <filename>/etc/os-release</filename> and
|
||
<filename>/usr/lib/os-release</filename> files might be symlinks
|
||
to other files, but it is important that the file is available
|
||
from earliest boot on, and hence must be located on the root file
|
||
system.</para>
|
||
|
||
<para>For a longer rationale for <filename>os-release</filename>
|
||
please refer to the <ulink
|
||
url="http://0pointer.de/blog/projects/os-release">Announcement of <filename>/etc/os-release</filename></ulink>.</para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Options</title>
|
||
|
||
<para>The following OS identifications parameters may be set using
|
||
<filename>os-release</filename>:</para>
|
||
|
||
<variablelist class='environment-variables'>
|
||
|
||
<varlistentry>
|
||
<term><varname>NAME=</varname></term>
|
||
|
||
<listitem><para>A string identifying the operating system,
|
||
without a version component, and suitable for presentation to
|
||
the user. If not set, defaults to
|
||
<literal>NAME=Linux</literal>. Example:
|
||
<literal>NAME=Fedora</literal> or <literal>NAME="Debian
|
||
GNU/Linux"</literal>.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>VERSION=</varname></term>
|
||
|
||
<listitem><para>A string identifying the operating system
|
||
version, excluding any OS name information, possibly including
|
||
a release code name, and suitable for presentation to the
|
||
user. This field is optional. Example:
|
||
<literal>VERSION=17</literal> or <literal>VERSION="17 (Beefy
|
||
Miracle)"</literal>.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>ID=</varname></term>
|
||
|
||
<listitem><para>A lower-case string (no spaces or other
|
||
characters outside of 0–9, a–z, ".", "_" and "-") identifying
|
||
the operating system, excluding any version information and
|
||
suitable for processing by scripts or usage in generated
|
||
filenames. If not set, defaults to
|
||
<literal>ID=linux</literal>. Example:
|
||
<literal>ID=fedora</literal> or
|
||
<literal>ID=debian</literal>.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>ID_LIKE=</varname></term>
|
||
|
||
<listitem><para>A space-separated list of operating system
|
||
identifiers in the same syntax as the <varname>ID=</varname>
|
||
setting. It should list identifiers of operating systems that
|
||
are closely related to the local operating system in regards
|
||
to packaging and programming interfaces, for example listing
|
||
one or more OS identifiers the local OS is a derivative from.
|
||
An OS should generally only list other OS identifiers it
|
||
itself is a derivative of, and not any OSes that are derived
|
||
from it, though symmetric relationships are possible. Build
|
||
scripts and similar should check this variable if they need to
|
||
identify the local operating system and the value of
|
||
<varname>ID=</varname> is not recognized. Operating systems
|
||
should be listed in order of how closely the local operating
|
||
system relates to the listed ones, starting with the closest.
|
||
This field is optional. Example: for an operating system with
|
||
<literal>ID=centos</literal>, an assignment of
|
||
<literal>ID_LIKE="rhel fedora"</literal> would be appropriate.
|
||
For an operating system with <literal>ID=ubuntu</literal>, an
|
||
assignment of <literal>ID_LIKE=debian</literal> is
|
||
appropriate.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>VERSION_CODENAME=</varname></term>
|
||
|
||
<listitem><para>
|
||
A lower-case string (no spaces or other characters outside of
|
||
0–9, a–z, ".", "_" and "-") identifying the operating system
|
||
release code name, excluding any OS name information or
|
||
release version, and suitable for processing by scripts or
|
||
usage in generated filenames. This field is optional and may
|
||
not be implemented on all systems.
|
||
Examples:
|
||
<literal>VERSION_CODENAME=buster</literal>,
|
||
<literal>VERSION_CODENAME=xenial</literal>
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>VERSION_ID=</varname></term>
|
||
|
||
<listitem><para>A lower-case string (mostly numeric, no spaces
|
||
or other characters outside of 0–9, a–z, ".", "_" and "-")
|
||
identifying the operating system version, excluding any OS
|
||
name information or release code name, and suitable for
|
||
processing by scripts or usage in generated filenames. This
|
||
field is optional. Example: <literal>VERSION_ID=17</literal>
|
||
or <literal>VERSION_ID=11.04</literal>.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>PRETTY_NAME=</varname></term>
|
||
|
||
<listitem><para>A pretty operating system name in a format
|
||
suitable for presentation to the user. May or may not contain
|
||
a release code name or OS version of some kind, as suitable.
|
||
If not set, defaults to
|
||
<literal>PRETTY_NAME="Linux"</literal>. Example:
|
||
<literal>PRETTY_NAME="Fedora 17 (Beefy
|
||
Miracle)"</literal>.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>ANSI_COLOR=</varname></term>
|
||
|
||
<listitem><para>A suggested presentation color when showing
|
||
the OS name on the console. This should be specified as string
|
||
suitable for inclusion in the ESC [ m ANSI/ECMA-48 escape code
|
||
for setting graphical rendition. This field is optional.
|
||
Example: <literal>ANSI_COLOR="0;31"</literal> for red, or
|
||
<literal>ANSI_COLOR="1;34"</literal> for light
|
||
blue.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>CPE_NAME=</varname></term>
|
||
|
||
<listitem><para>A CPE name for the operating system, in URI
|
||
binding syntax, following the
|
||
<ulink url="http://scap.nist.gov/specifications/cpe/">Common
|
||
Platform Enumeration Specification</ulink> as proposed by the
|
||
NIST. This field is optional. Example:
|
||
<literal>CPE_NAME="cpe:/o:fedoraproject:fedora:17"</literal>
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>HOME_URL=</varname></term>
|
||
<term><varname>DOCUMENTATION_URL=</varname></term>
|
||
<term><varname>SUPPORT_URL=</varname></term>
|
||
<term><varname>BUG_REPORT_URL=</varname></term>
|
||
<term><varname>PRIVACY_POLICY_URL=</varname></term>
|
||
|
||
<listitem><para>Links to resources on the Internet related to
|
||
the operating system.
|
||
<varname>HOME_URL=</varname> should refer to the homepage of
|
||
the operating system, or alternatively some homepage of the
|
||
specific version of the operating system.
|
||
<varname>DOCUMENTATION_URL=</varname> should refer to the main
|
||
documentation page for this operating system.
|
||
<varname>SUPPORT_URL=</varname> should refer to the main
|
||
support page for the operating system, if there is any. This
|
||
is primarily intended for operating systems which vendors
|
||
provide support for. <varname>BUG_REPORT_URL=</varname> should
|
||
refer to the main bug reporting page for the operating system,
|
||
if there is any. This is primarily intended for operating
|
||
systems that rely on community QA.
|
||
<varname>PRIVACY_POLICY_URL=</varname> should refer to the
|
||
main privacy policy page for the operating system, if there is
|
||
any. These settings are optional, and providing only some of
|
||
these settings is common. These URLs are intended to be
|
||
exposed in "About this system" UIs behind links with captions
|
||
such as "About this Operating System", "Obtain Support",
|
||
"Report a Bug", or "Privacy Policy". The values should be in
|
||
<ulink url="https://tools.ietf.org/html/rfc3986">RFC3986
|
||
format</ulink>, and should be <literal>http:</literal> or
|
||
<literal>https:</literal> URLs, and possibly
|
||
<literal>mailto:</literal> or <literal>tel:</literal>. Only
|
||
one URL shall be listed in each setting. If multiple resources
|
||
need to be referenced, it is recommended to provide an online
|
||
landing page linking all available resources. Examples:
|
||
<literal>HOME_URL="https://fedoraproject.org/"</literal> and
|
||
<literal>BUG_REPORT_URL="https://bugzilla.redhat.com/"</literal></para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>BUILD_ID=</varname></term>
|
||
|
||
<listitem><para>A string uniquely identifying the system image
|
||
used as the origin for a distribution (it is not updated with
|
||
system updates). The field can be identical between different
|
||
VERSION_IDs as BUILD_ID is an only a unique identifier to a
|
||
specific version. Distributions that release each update as a
|
||
new version would only need to use VERSION_ID as each build is
|
||
already distinct based on the VERSION_ID. This field is
|
||
optional. Example: <literal>BUILD_ID="2013-03-20.3"</literal>
|
||
or <literal>BUILD_ID=201303203</literal>.
|
||
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>VARIANT=</varname></term>
|
||
|
||
<listitem><para>
|
||
A string identifying a specific variant or edition of the
|
||
operating system suitable for presentation to the user. This
|
||
field may be used to inform the user that the configuration of
|
||
this system is subject to a specific divergent set of rules or
|
||
default configuration settings. This field is optional and may
|
||
not be implemented on all systems.
|
||
Examples:
|
||
<literal>VARIANT="Server Edition"</literal>,
|
||
<literal>VARIANT="Smart Refrigerator Edition"</literal>
|
||
Note: this field is for display purposes only. The
|
||
<varname>VARIANT_ID</varname> field should be used for making
|
||
programmatic decisions.
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>VARIANT_ID=</varname></term>
|
||
|
||
<listitem><para>
|
||
A lower-case string (no spaces or other characters outside of
|
||
0–9, a–z, ".", "_" and "-"), identifying a specific variant or
|
||
edition of the operating system. This may be interpreted by
|
||
other packages in order to determine a divergent default
|
||
configuration. This field is optional and may not be
|
||
implemented on all systems.
|
||
Examples:
|
||
<literal>VARIANT_ID=server</literal>,
|
||
<literal>VARIANT_ID=embedded</literal>
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><varname>LOGO=</varname></term>
|
||
|
||
<listitem><para>
|
||
A string, specifying the name of an icon as defined by <ulink
|
||
url="http://standards.freedesktop.org/icon-theme-spec/latest">
|
||
freedesktop.org Icon Theme Specification</ulink>. This can be
|
||
used by graphical applications to display an operating
|
||
system's or distributor's logo. This field is optional and
|
||
may not necessarily be implemented on all systems.
|
||
Examples:
|
||
<literal>LOGO=fedora-logo</literal>,
|
||
<literal>LOGO=distributor-logo-opensuse</literal>
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
</variablelist>
|
||
|
||
<para>If you are reading this file from C code or a shell script
|
||
to determine the OS or a specific version of it, use the
|
||
<varname>ID</varname> and <varname>VERSION_ID</varname> fields,
|
||
possibly with <varname>ID_LIKE</varname> as fallback for
|
||
<varname>ID</varname>. When looking for an OS identification
|
||
string for presentation to the user use the
|
||
<varname>PRETTY_NAME</varname> field.</para>
|
||
|
||
<para>Note that operating system vendors may choose not to provide
|
||
version information, for example to accommodate for rolling
|
||
releases. In this case, <varname>VERSION</varname> and
|
||
<varname>VERSION_ID</varname> may be unset. Applications should
|
||
not rely on these fields to be set.</para>
|
||
|
||
<para>Operating system vendors may extend the file
|
||
format and introduce new fields. It is highly
|
||
recommended to prefix new fields with an OS specific
|
||
name in order to avoid name clashes. Applications
|
||
reading this file must ignore unknown fields. Example:
|
||
<literal>DEBIAN_BTS="debbugs://bugs.debian.org/"</literal></para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Example</title>
|
||
|
||
<programlisting>NAME=Fedora
|
||
VERSION="17 (Beefy Miracle)"
|
||
ID=fedora
|
||
VERSION_ID=17
|
||
PRETTY_NAME="Fedora 17 (Beefy Miracle)"
|
||
ANSI_COLOR="0;34"
|
||
CPE_NAME="cpe:/o:fedoraproject:fedora:17"
|
||
HOME_URL="https://fedoraproject.org/"
|
||
BUG_REPORT_URL="https://bugzilla.redhat.com/"</programlisting>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>See Also</title>
|
||
<para>
|
||
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
||
<citerefentry project='die-net'><refentrytitle>lsb_release</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>hostname</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>machine-info</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
||
</para>
|
||
</refsect1>
|
||
|
||
</refentry>
|