mirror of
https://github.com/systemd/systemd
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f4e518e812
https://github.com/systemd/systemd/issues/27514 requested this functionality among other things, but it is already implemented. The man page was also missing 'show' in the synopsis, so add that, along with an example.
180 lines
6.3 KiB
XML
180 lines
6.3 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>Both <command>machine-id</command> and <command>boot-id</command> may be combined
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with the <option>--app-specific=<replaceable>app-id</replaceable></option> switch to
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generate 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.</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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</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></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, an identifier that is the result of hashing the
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application identifier <replaceable>app-id</replaceable> and the machine identifier will be
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printed. The <replaceable>app-id</replaceable> argument must be a valid sd-id128 string
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identifying the application.</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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</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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