mirror of
https://github.com/systemd/systemd
synced 2024-10-04 15:21:01 +00:00
437e217a48
I'm keeping this as a separate commit. It is the first time version
information is manually added after 6a73a4f7c4
and we might want to revert this later.
210 lines
7.7 KiB
XML
210 lines
7.7 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-id128" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-id128</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-id128</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-id128</refname>
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<refpurpose>Generate and print sd-128 identifiers</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-id128</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">new</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-id128</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">machine-id</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-id128</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">boot-id</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-id128</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">invocation-id</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>systemd-id128</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">show</arg>
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<arg choice="opt" rep="repeat">NAME|UUID</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>id128</command> may be used to conveniently print
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<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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UUIDs. What identifier is printed depends on the specific verb.</para>
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<para>With <command>new</command>, a new random identifier will be generated.</para>
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<para>With <command>machine-id</command>, the identifier of the current machine will be
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printed. See
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para>With <command>boot-id</command>, the identifier of the current boot will be
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printed.</para>
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<para>With <command>invocation-id</command>, the identifier of the current service invocation
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will be printed. This is available in systemd services. See
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para>With <command>show</command>, well-known IDs are printed (for now, only GPT partition type UUIDs),
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along with brief identifier strings. When no arguments are specified, all known IDs are shown. When
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arguments are specified, they may be the identifiers or ID values of one or more known IDs, which are
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then printed with their name, or arbitrary IDs, which are then printed with a placeholder name. Combine
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with <option>--uuid</option> to list the IDs in UUID style, i.e. the way GPT partition type UUIDs are
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usually shown.</para>
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<para><command>machine-id</command>, <command>boot-id</command>, and <command>show</command> may be
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combined with the <option>--app-specific=<replaceable>app-id</replaceable></option> switch to generate
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application-specific IDs. See
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<citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for the discussion when this is useful. Support for <command>show --app-specific=</command> was added in
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version 255.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>-p</option></term>
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<term><option>--pretty</option></term>
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<listitem><para>Generate output as programming language snippets.</para>
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<xi:include href="version-info.xml" xpointer="v240"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-P</option></term>
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<term><option>--value</option></term>
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<listitem><para>Only print the value. May be combined with
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<option>-u</option>/<option>--uuid</option>.</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-a <replaceable>app-id</replaceable></option></term>
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<term><option>--app-specific=<replaceable>app-id</replaceable></option></term>
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<listitem><para>With this option, identifiers will be printed that are the result of hashing the
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application identifier <replaceable>app-id</replaceable> and another ID. The
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<replaceable>app-id</replaceable> argument must be a valid sd-id128 string identifying the
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application. When used with <command>machine-id</command>, the other ID will be the machine ID as
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described in
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>, when
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used with <command>boot-id</command>, the other ID will be the boot ID, and when used with
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<command>show</command>, the other ID or IDs should be specified via the positional arguments.</para>
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<xi:include href="version-info.xml" xpointer="v240"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-u</option></term>
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<term><option>--uuid</option></term>
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<listitem><para>Generate output as a UUID formatted in the "canonical representation", with five
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groups of digits separated by hyphens. See the
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<ulink url="https://en.wikipedia.org/wiki/Universally_unique_identifier#Format">wikipedia</ulink>
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for more discussion.</para>
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<xi:include href="version-info.xml" xpointer="v244"/></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success 0 is returned, and a non-zero failure code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<example>
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<title>Show a well-known UUID</title>
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<programlisting>
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$ systemd-id128 show -P user-home
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773f91ef66d449b5bd83d683bf40ad16
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$ systemd-id128 show -Pu user-home
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773f91ef-66d4-49b5-bd83-d683bf40ad16
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$ systemd-id128 show 773f91ef-66d4-49b5-bd83-d683bf40ad16
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NAME ID
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user-home 773f91ef66d449b5bd83d683bf40ad16
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</programlisting>
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</example>
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<example>
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<title>Generate an application-specific UUID</title>
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<programlisting>
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$ systemd-id128 machine-id -u
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3a9d668b-4db7-4939-8a4a-5e78a03bffb7
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$ systemd-id128 new -u
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1fb8f24b-02df-458d-9659-cc8ace68e28a
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$ systemd-id128 --app=1fb8f24b-02df-458d-9659-cc8ace68e28a
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47b82cb1-5339-43da-b2a6-1c350aef1bd1
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$ systemd-id128 -Pu show 3a9d668b-4db7-4939-8a4a-5e78a03bffb7 --app=1fb8f24b-02df-458d-9659-cc8ace68e28a
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47b82cb1-5339-43da-b2a6-1c350aef1bd1
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</programlisting>
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<para>On a given machine with the ID 3a9d668b-4db7-4939-8a4a-5e78a03bffb7, for the application
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1fb8f24b-02df-458d-9659-cc8ace68e28a, we generate an application-specific machine ID. If we want to
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later recreate the same calculation on a different machine, we need to specify both IDs explicitly.
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</para>
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</example>
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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>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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