mirror of
https://github.com/systemd/systemd
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216 lines
8.2 KiB
XML
216 lines
8.2 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/4.5/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 Wikipedia entry for
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<ulink url="https://en.wikipedia.org/wiki/Universally_unique_identifier#Format">Universally Unique Identifiers</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="no-pager" />
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<xi:include href="standard-options.xml" xpointer="no-legend" />
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<xi:include href="standard-options.xml" xpointer="json" />
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<xi:include href="standard-options.xml" xpointer="j" />
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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 --value user-home
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773f91ef66d449b5bd83d683bf40ad16
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$ systemd-id128 show --value --uuid 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 machine-id -u -a 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 \
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-a 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
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(47b82cb1-5339-43da-b2a6-1c350aef1bd1). If we want to later recreate the same calculation on a
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different machine, we need to specify both IDs explicitly as parameters to <command>show</command>.
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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><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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