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514094f9 | 1 | <?xml version='1.0'?> |
3a54a157 | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
db9ecf05 | 4 | <!-- SPDX-License-Identifier: LGPL-2.1-or-later --> |
f48f7543 | 5 | |
c94c581c YW |
6 | <refentry id="udevadm" |
7 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
8 | ||
63749b1a | 9 | <refentryinfo> |
225cb03b | 10 | <title>udevadm</title> |
d3a2386d | 11 | <productname>systemd</productname> |
63749b1a | 12 | </refentryinfo> |
225cb03b | 13 | |
63749b1a KS |
14 | <refmeta> |
15 | <refentrytitle>udevadm</refentrytitle> | |
16 | <manvolnum>8</manvolnum> | |
63749b1a | 17 | </refmeta> |
225cb03b | 18 | |
63749b1a KS |
19 | <refnamediv> |
20 | <refname>udevadm</refname><refpurpose>udev management tool</refpurpose> | |
21 | </refnamediv> | |
225cb03b | 22 | |
63749b1a KS |
23 | <refsynopsisdiv> |
24 | <cmdsynopsis> | |
25 | <command>udevadm</command> | |
26 | <arg><option>--debug</option></arg> | |
27 | <arg><option>--version</option></arg> | |
28 | <arg><option>--help</option></arg> | |
29 | </cmdsynopsis> | |
30 | <cmdsynopsis> | |
c94c581c | 31 | <command>udevadm info <optional>options</optional> <optional>devpath</optional></command> |
63749b1a KS |
32 | </cmdsynopsis> |
33 | <cmdsynopsis> | |
c94c581c | 34 | <command>udevadm trigger <optional>options</optional> <optional>devpath</optional></command> |
63749b1a KS |
35 | </cmdsynopsis> |
36 | <cmdsynopsis> | |
37 | <command>udevadm settle <optional>options</optional></command> | |
38 | </cmdsynopsis> | |
39 | <cmdsynopsis> | |
c94c581c | 40 | <command>udevadm control <replaceable>option</replaceable></command> |
63749b1a KS |
41 | </cmdsynopsis> |
42 | <cmdsynopsis> | |
43 | <command>udevadm monitor <optional>options</optional></command> | |
44 | </cmdsynopsis> | |
45 | <cmdsynopsis> | |
46 | <command>udevadm test <optional>options</optional> <replaceable>devpath</replaceable></command> | |
47 | </cmdsynopsis> | |
d7867b31 KS |
48 | <cmdsynopsis> |
49 | <command>udevadm test-builtin <optional>options</optional> <replaceable>command</replaceable> <replaceable>devpath</replaceable></command> | |
50 | </cmdsynopsis> | |
aa2b0d8d YW |
51 | <cmdsynopsis> |
52 | <command>udevadm wait <optional>options</optional> <replaceable>device|syspath</replaceable></command> | |
53 | </cmdsynopsis> | |
ae61c53c LP |
54 | <cmdsynopsis> |
55 | <command>udevadm lock <optional>options</optional> <replaceable>command</replaceable></command> | |
56 | </cmdsynopsis> | |
63749b1a | 57 | </refsynopsisdiv> |
225cb03b | 58 | |
63749b1a | 59 | <refsect1><title>Description</title> |
124b48b0 ZJS |
60 | <para><command>udevadm</command> expects a command and command |
61 | specific options. It controls the runtime behavior of | |
62 | <command>systemd-udevd</command>, requests kernel events, manages | |
63 | the event queue, and provides simple debugging mechanisms.</para> | |
63749b1a | 64 | </refsect1> |
225cb03b | 65 | |
80877656 | 66 | <refsect1><title>Options</title> |
63749b1a KS |
67 | <variablelist> |
68 | <varlistentry> | |
c94c581c | 69 | <term><option>-d</option></term> |
63749b1a KS |
70 | <term><option>--debug</option></term> |
71 | <listitem> | |
35a44646 YW |
72 | <para>Print debug messages to standard error. This option is implied in <command>udevadm test</command> and |
73 | <command>udevadm test-builtin</command> commands.</para> | |
63749b1a KS |
74 | </listitem> |
75 | </varlistentry> | |
c94c581c | 76 | |
c94c581c | 77 | <xi:include href="standard-options.xml" xpointer="help" /> |
63749b1a | 78 | </variablelist> |
225cb03b | 79 | |
80877656 ZJS |
80 | <refsect2><title>udevadm info |
81 | <arg choice="opt"><replaceable>options</replaceable></arg> | |
3c79311a | 82 | <arg choice="opt" rep="repeat"><replaceable>devpath</replaceable>|<replaceable>file</replaceable>|<replaceable>unit</replaceable></arg> |
80877656 ZJS |
83 | </title> |
84 | ||
b6854081 ZJS |
85 | <para>Query the udev database for device information.</para> |
86 | ||
3c79311a ZJS |
87 | <para>Positional arguments should be used to specify one or more devices. Each one may be a device name |
88 | (in which case it must start with <filename>/dev/</filename>), a sys path (in which case it must start | |
89 | with <filename>/sys/</filename>), or a systemd device unit name (in which case it must end with | |
b6854081 ZJS |
90 | <literal>.device</literal>, see |
91 | <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>). | |
92 | </para> | |
93 | ||
63749b1a KS |
94 | <variablelist> |
95 | <varlistentry> | |
7643ac9a ZJS |
96 | <term><option>-q</option></term> |
97 | <term><option>--query=<replaceable>TYPE</replaceable></option></term> | |
63749b1a | 98 | <listitem> |
b6854081 | 99 | <para>Query the database for the specified type of device data. |
7643ac9a ZJS |
100 | Valid <replaceable>TYPE</replaceable>s are: |
101 | <constant>name</constant>, <constant>symlink</constant>, | |
102 | <constant>path</constant>, <constant>property</constant>, | |
124b48b0 | 103 | <constant>all</constant>.</para> |
63749b1a KS |
104 | </listitem> |
105 | </varlistentry> | |
b6854081 | 106 | |
6c1482b2 FS |
107 | <varlistentry> |
108 | <term><option>--property=<replaceable>NAME</replaceable></option></term> | |
109 | <listitem> | |
110 | <para>When showing device properties using the <option>--query=property</option> | |
111 | option, limit display to properties specified in the argument. The argument should | |
112 | be a comma-separated list of property names. If not specified, all known properties | |
113 | are shown.</para> | |
114 | </listitem> | |
115 | </varlistentry> | |
116 | <varlistentry> | |
117 | <term><option>--value</option></term> | |
118 | <listitem> | |
119 | <para>When showing device properties using the <option>--query=property</option> | |
120 | option, print only their values, and skip the property name and <literal>=</literal>.</para> | |
121 | <para>Cannot be used together with <option>-x/--export</option> or | |
122 | <option>-P/--export-prefix</option>.</para> | |
123 | </listitem> | |
124 | </varlistentry> | |
63749b1a | 125 | <varlistentry> |
7643ac9a ZJS |
126 | <term><option>-p</option></term> |
127 | <term><option>--path=<replaceable>DEVPATH</replaceable></option></term> | |
63749b1a | 128 | <listitem> |
3b121157 ZJS |
129 | <para>The <filename>/sys/</filename> path of the device to query, e.g. |
130 | <filename><optional>/sys/</optional>/class/block/sda</filename>. This option is an alternative to | |
b6854081 ZJS |
131 | the positional argument with a <filename>/sys/</filename> prefix. <command>udevadm info |
132 | --path=/class/block/sda</command> is equivalent to <command>udevadm info | |
133 | /sys/class/block/sda</command>.</para> | |
63749b1a KS |
134 | </listitem> |
135 | </varlistentry> | |
136 | <varlistentry> | |
7643ac9a ZJS |
137 | <term><option>-n</option></term> |
138 | <term><option>--name=<replaceable>FILE</replaceable></option></term> | |
63749b1a | 139 | <listitem> |
124b48b0 | 140 | <para>The name of the device node or a symlink to query, |
3b121157 | 141 | e.g. <filename><optional>/dev/</optional>/sda</filename>. This option is an alternative to the |
b6854081 ZJS |
142 | positional argument with a <filename>/dev/</filename> prefix. <command>udevadm info |
143 | --name=sda</command> is equivalent to <command>udevadm info /dev/sda</command>.</para> | |
63749b1a KS |
144 | </listitem> |
145 | </varlistentry> | |
146 | <varlistentry> | |
7643ac9a | 147 | <term><option>-r</option></term> |
63749b1a KS |
148 | <term><option>--root</option></term> |
149 | <listitem> | |
4f5d327a KS |
150 | <para>Print absolute paths in <command>name</command> or <command>symlink</command> |
151 | query.</para> | |
4ec9c3e7 KS |
152 | </listitem> |
153 | </varlistentry> | |
63749b1a | 154 | <varlistentry> |
7643ac9a | 155 | <term><option>-a</option></term> |
63749b1a KS |
156 | <term><option>--attribute-walk</option></term> |
157 | <listitem> | |
158 | <para>Print all sysfs properties of the specified device that can be used | |
159 | in udev rules to match the specified device. It prints all devices | |
160 | along the chain, up to the root of sysfs that can be used in udev rules.</para> | |
161 | </listitem> | |
162 | </varlistentry> | |
dc1791a9 | 163 | <varlistentry> |
7643ac9a | 164 | <term><option>-x</option></term> |
dc1791a9 KS |
165 | <term><option>--export</option></term> |
166 | <listitem> | |
f0c29bbf YW |
167 | <para>Print output as key/value pairs. Values are enclosed in single quotes. |
168 | This takes effects only when <option>--query=property</option> or | |
169 | <option>--device-id-of-file=<replaceable>FILE</replaceable></option> is specified.</para> | |
dc1791a9 KS |
170 | </listitem> |
171 | </varlistentry> | |
172 | <varlistentry> | |
7643ac9a ZJS |
173 | <term><option>-P</option></term> |
174 | <term><option>--export-prefix=<replaceable>NAME</replaceable></option></term> | |
dc1791a9 | 175 | <listitem> |
f0c29bbf YW |
176 | <para>Add a prefix to the key name of exported values. |
177 | This implies <option>--export</option>.</para> | |
dc1791a9 KS |
178 | </listitem> |
179 | </varlistentry> | |
63749b1a | 180 | <varlistentry> |
7643ac9a ZJS |
181 | <term><option>-d</option></term> |
182 | <term><option>--device-id-of-file=<replaceable>FILE</replaceable></option></term> | |
63749b1a | 183 | <listitem> |
f0c29bbf YW |
184 | <para>Print major/minor numbers of the underlying device, where the file lives on. |
185 | If this is specified, all positional arguments are ignored.</para> | |
63749b1a KS |
186 | </listitem> |
187 | </varlistentry> | |
188 | <varlistentry> | |
7643ac9a | 189 | <term><option>-e</option></term> |
63749b1a KS |
190 | <term><option>--export-db</option></term> |
191 | <listitem> | |
192 | <para>Export the content of the udev database.</para> | |
193 | </listitem> | |
194 | </varlistentry> | |
9ead6627 | 195 | <varlistentry> |
7643ac9a | 196 | <term><option>-c</option></term> |
9ead6627 KS |
197 | <term><option>--cleanup-db</option></term> |
198 | <listitem> | |
199 | <para>Cleanup the udev database.</para> | |
200 | </listitem> | |
201 | </varlistentry> | |
ae760f4b YW |
202 | <varlistentry> |
203 | <term><option>-w<optional>SECONDS</optional></option></term> | |
204 | <term><option>--wait-for-initialization<optional>=SECONDS</optional></option></term> | |
205 | <listitem> | |
206 | <para>Wait for device to be initialized. If argument <replaceable>SECONDS</replaceable> | |
207 | is not specified, the default is to wait forever.</para> | |
208 | </listitem> | |
209 | </varlistentry> | |
c94c581c | 210 | |
c94c581c | 211 | <xi:include href="standard-options.xml" xpointer="help" /> |
63749b1a | 212 | </variablelist> |
205013c8 LP |
213 | |
214 | <para>The generated output shows the current device database entry in a terse format. Each line shown | |
215 | is prefixed with one of the following characters:</para> | |
216 | ||
217 | <table> | |
218 | <title><command>udevadm info</command> output prefixes</title> | |
219 | <tgroup cols='2' align='left' colsep='1' rowsep='1'> | |
220 | <colspec colname="prefix" /> | |
221 | <colspec colname="meaning" /> | |
222 | <thead> | |
223 | <row> | |
224 | <entry>Prefix</entry> | |
225 | <entry>Meaning</entry> | |
226 | </row> | |
227 | </thead> | |
228 | <tbody> | |
229 | <row> | |
230 | <entry><literal>P:</literal></entry> | |
231 | <entry>Device path in <filename>/sys/</filename></entry> | |
232 | </row> | |
a0e90259 LP |
233 | <row> |
234 | <entry><literal>M:</literal></entry> | |
235 | <entry>Device name in <filename>/sys/</filename> (i.e. the last component of <literal>P:</literal>)</entry> | |
236 | </row> | |
237 | <row> | |
238 | <entry><literal>R:</literal></entry> | |
239 | <entry>Device number in <filename>/sys/</filename> (i.e. the numeric suffix of the last component of <literal>P:</literal>)</entry> | |
240 | </row> | |
241 | <row> | |
242 | <entry><literal>U:</literal></entry> | |
243 | <entry>Kernel subsystem</entry> | |
244 | </row> | |
245 | <row> | |
246 | <entry><literal>T:</literal></entry> | |
247 | <entry>Kernel device type within subsystem</entry> | |
248 | </row> | |
249 | <row> | |
250 | <entry><literal>D:</literal></entry> | |
251 | <entry>Kernel device node major/minor</entry> | |
252 | </row> | |
253 | <row> | |
254 | <entry><literal>I:</literal></entry> | |
255 | <entry>Network interface index</entry> | |
256 | </row> | |
205013c8 LP |
257 | <row> |
258 | <entry><literal>N:</literal></entry> | |
259 | <entry>Kernel device node name</entry> | |
260 | </row> | |
261 | <row> | |
262 | <entry><literal>L:</literal></entry> | |
263 | <entry>Device node symlink priority</entry> | |
264 | </row> | |
265 | <row> | |
266 | <entry><literal>S:</literal></entry> | |
267 | <entry>Device node symlink</entry> | |
268 | </row> | |
a0e90259 LP |
269 | <row> |
270 | <entry><literal>Q:</literal></entry> | |
271 | <entry>Block device sequence number (DISKSEQ)</entry> | |
272 | </row> | |
273 | <row> | |
274 | <entry><literal>V:</literal></entry> | |
275 | <entry>Attached driver</entry> | |
276 | </row> | |
205013c8 LP |
277 | <row> |
278 | <entry><literal>E:</literal></entry> | |
279 | <entry>Device property</entry> | |
280 | </row> | |
281 | </tbody> | |
282 | </tgroup> | |
283 | </table> | |
63749b1a | 284 | </refsect2> |
225cb03b | 285 | |
80877656 ZJS |
286 | <refsect2><title>udevadm trigger |
287 | <arg choice="opt"><replaceable>options</replaceable></arg> | |
a9bc94e5 | 288 | <arg choice="opt"><replaceable>devpath</replaceable>|<replaceable>file</replaceable>|<replaceable>unit</replaceable></arg> |
b6854081 | 289 | </title> |
63749b1a | 290 | <para>Request device events from the kernel. Primarily used to replay events at system coldplug time.</para> |
b6854081 | 291 | |
5b3b0733 | 292 | <para>Takes device specifications as positional arguments. See the description of <command>info</command> |
b6854081 ZJS |
293 | above.</para> |
294 | ||
63749b1a KS |
295 | <variablelist> |
296 | <varlistentry> | |
7643ac9a | 297 | <term><option>-v</option></term> |
63749b1a KS |
298 | <term><option>--verbose</option></term> |
299 | <listitem> | |
300 | <para>Print the list of devices which will be triggered.</para> | |
301 | </listitem> | |
302 | </varlistentry> | |
303 | <varlistentry> | |
7643ac9a | 304 | <term><option>-n</option></term> |
63749b1a KS |
305 | <term><option>--dry-run</option></term> |
306 | <listitem> | |
307 | <para>Do not actually trigger the event.</para> | |
308 | </listitem> | |
309 | </varlistentry> | |
6c99c265 YW |
310 | <varlistentry> |
311 | <term><option>-q</option></term> | |
312 | <term><option>--quiet</option></term> | |
313 | <listitem> | |
314 | <para>Suppress error logging in triggering events.</para> | |
315 | </listitem> | |
316 | </varlistentry> | |
63749b1a | 317 | <varlistentry> |
7643ac9a ZJS |
318 | <term><option>-t</option></term> |
319 | <term><option>--type=<replaceable>TYPE</replaceable></option></term> | |
63749b1a | 320 | <listitem> |
1baeee57 YW |
321 | <para>Trigger a specific type of devices. Valid types are <literal>all</literal>, |
322 | <literal>devices</literal>, and <literal>subsystems</literal>. The default value is | |
323 | <literal>devices</literal>.</para> | |
63749b1a KS |
324 | </listitem> |
325 | </varlistentry> | |
326 | <varlistentry> | |
7643ac9a ZJS |
327 | <term><option>-c</option></term> |
328 | <term><option>--action=<replaceable>ACTION</replaceable></option></term> | |
63749b1a | 329 | <listitem> |
cd648ae1 YW |
330 | <para>Type of event to be triggered. Possible actions are <literal>add</literal>, |
331 | <literal>remove</literal>, <literal>change</literal>, <literal>move</literal>, | |
332 | <literal>online</literal>, <literal>offline</literal>, <literal>bind</literal>, | |
6d22bd87 YW |
333 | and <literal>unbind</literal>. Also, the special value <literal>help</literal> can be used |
334 | to list the possible actions. The default value is <literal>change</literal>. | |
335 | </para> | |
63749b1a KS |
336 | </listitem> |
337 | </varlistentry> | |
873cf95c YW |
338 | <varlistentry> |
339 | <term><option>--prioritized-subsystem=<replaceable>SUBSYSTEM<optional>,<replaceable>SUBSYSTEM</replaceable>…</optional></replaceable></option></term> | |
340 | <listitem> | |
341 | <para>Takes a comma separated list of subsystems. When triggering events for devices, the | |
342 | devices from the specified subsystems and their parents are triggered first. For example, | |
343 | if <option>--prioritized-subsystem=block,net</option>, then firstly all block devices and | |
344 | their parents are triggered, in the next all network devices and their parents are | |
345 | triggered, and lastly the other devices are triggered. This option can be specified | |
346 | multiple times, and in that case the lists of the subsystems will be merged. That is, | |
347 | <option>--prioritized-subsystem=block --prioritized-subsystem=net</option> is equivalent to | |
348 | <option>--prioritized-subsystem=block,net</option>.</para> | |
349 | </listitem> | |
350 | </varlistentry> | |
63749b1a | 351 | <varlistentry> |
7643ac9a ZJS |
352 | <term><option>-s</option></term> |
353 | <term><option>--subsystem-match=<replaceable>SUBSYSTEM</replaceable></option></term> | |
63749b1a | 354 | <listitem> |
7643ac9a | 355 | <para>Trigger events for devices which belong to a |
a9bc94e5 YW |
356 | matching subsystem. This option supports shell style pattern matching. |
357 | When this option is specified more than once, then each matching result is ORed, that is, | |
358 | all the devices in each subsystem are triggered.</para> | |
63749b1a KS |
359 | </listitem> |
360 | </varlistentry> | |
361 | <varlistentry> | |
7643ac9a ZJS |
362 | <term><option>-S</option></term> |
363 | <term><option>--subsystem-nomatch=<replaceable>SUBSYSTEM</replaceable></option></term> | |
63749b1a KS |
364 | <listitem> |
365 | <para>Do not trigger events for devices which belong to a matching subsystem. This option | |
a9bc94e5 YW |
366 | supports shell style pattern matching. When this option is specified more than once, |
367 | then each matching result is ANDed, that is, devices which do not match all specified | |
368 | subsystems are triggered.</para> | |
63749b1a KS |
369 | </listitem> |
370 | </varlistentry> | |
371 | <varlistentry> | |
7643ac9a ZJS |
372 | <term><option>-a</option></term> |
373 | <term><option>--attr-match=<replaceable>ATTRIBUTE</replaceable>=<replaceable>VALUE</replaceable></option></term> | |
63749b1a | 374 | <listitem> |
a9bc94e5 YW |
375 | <para>Trigger events for devices with a matching sysfs attribute. If a value is specified along |
376 | with the attribute name, the content of the attribute is matched against the given value using | |
377 | shell style pattern matching. If no value is specified, the existence of the sysfs attribute is | |
378 | checked. When this option is specified multiple times, then each matching result is ANDed, | |
379 | that is, only devices which have all specified attributes are triggered.</para> | |
63749b1a KS |
380 | </listitem> |
381 | </varlistentry> | |
382 | <varlistentry> | |
7643ac9a ZJS |
383 | <term><option>-A</option></term> |
384 | <term><option>--attr-nomatch=<replaceable>ATTRIBUTE</replaceable>=<replaceable>VALUE</replaceable></option></term> | |
63749b1a | 385 | <listitem> |
a9bc94e5 YW |
386 | <para>Do not trigger events for devices with a matching sysfs attribute. If a value is specified |
387 | along with the attribute name, the content of the attribute is matched against the given value | |
388 | using shell style pattern matching. If no value is specified, the existence of the sysfs attribute | |
389 | is checked. When this option is specified multiple times, then each matching result is ANDed, | |
390 | that is, only devices which have none of the specified attributes are triggered.</para> | |
63749b1a KS |
391 | </listitem> |
392 | </varlistentry> | |
393 | <varlistentry> | |
7643ac9a ZJS |
394 | <term><option>-p</option></term> |
395 | <term><option>--property-match=<replaceable>PROPERTY</replaceable>=<replaceable>VALUE</replaceable></option></term> | |
63749b1a | 396 | <listitem> |
a9bc94e5 YW |
397 | <para>Trigger events for devices with a matching property value. This option supports shell style |
398 | pattern matching. When this option is specified more than once, then each matching result is ORed, | |
399 | that is, devices which have one of the specified properties are triggered.</para> | |
63749b1a KS |
400 | </listitem> |
401 | </varlistentry> | |
402 | <varlistentry> | |
7643ac9a | 403 | <term><option>-g</option></term> |
d27e6aee | 404 | <term><option>--tag-match=<replaceable>TAG</replaceable></option></term> |
63749b1a | 405 | <listitem> |
a9bc94e5 YW |
406 | <para>Trigger events for devices with a matching tag. When this option is specified multiple times, |
407 | then each matching result is ANDed, that is, devices which have all specified tags are triggered.</para> | |
63749b1a KS |
408 | </listitem> |
409 | </varlistentry> | |
410 | <varlistentry> | |
7643ac9a | 411 | <term><option>-y</option></term> |
a9bc94e5 | 412 | <term><option>--sysname-match=<replaceable>NAME</replaceable></option></term> |
63749b1a | 413 | <listitem> |
a9bc94e5 | 414 | <para>Trigger events for devices for which the last component (i.e. the filename) of the |
3b121157 | 415 | <filename>/sys/</filename> path matches the specified <replaceable>PATH</replaceable>. This option |
a9bc94e5 YW |
416 | supports shell style pattern matching. When this option is specified more than once, then each |
417 | matching result is ORed, that is, all devices which have any of the specified | |
418 | <replaceable>NAME</replaceable> are triggered.</para> | |
63749b1a KS |
419 | </listitem> |
420 | </varlistentry> | |
80877656 ZJS |
421 | <varlistentry> |
422 | <term><option>--name-match=<replaceable>NAME</replaceable></option></term> | |
423 | <listitem> | |
a9bc94e5 | 424 | <para>Trigger events for devices with a matching device path. When this option is specified more than once, |
5b3b0733 | 425 | then each matching result is ORed, that is, all specified devices are triggered.</para> |
80877656 ZJS |
426 | </listitem> |
427 | </varlistentry> | |
b05211fa | 428 | <varlistentry> |
7643ac9a ZJS |
429 | <term><option>-b</option></term> |
430 | <term><option>--parent-match=<replaceable>SYSPATH</replaceable></option></term> | |
b05211fa | 431 | <listitem> |
a9bc94e5 | 432 | <para>Trigger events for all children of a given device. When this option is specified more than once, |
5b3b0733 | 433 | then each matching result is ORed, that is, all children of each specified device are triggered.</para> |
7643ac9a | 434 | </listitem> |
792cc203 | 435 | </varlistentry> |
678f2b16 DK |
436 | <varlistentry> |
437 | <term><option>--initialized-match</option></term> | |
438 | <term><option>--initialized-nomatch</option></term> | |
439 | <listitem> | |
440 | <para>When <option>--initialized-match</option> is specified, trigger events for devices | |
441 | that are already initialized by <command>systemd-udevd</command>, and skip devices that | |
442 | are not initialized yet.</para> | |
443 | <para>When <option>--initialized-nomatch</option> is specified, trigger events for devices | |
444 | that are not initialized by <command>systemd-udevd</command> yet, and skip devices that | |
445 | are already initialized.</para> | |
aa2b0d8d YW |
446 | <para>Typically, it is essential that applications which intend to use such a match, make |
447 | sure a suitable udev rule is installed that sets at least one property on devices that | |
448 | shall be matched. See also Initialized Devices section below for more details.</para> | |
678f2b16 DK |
449 | <para>WARNING: <option>--initialized-nomatch</option> can potentially save a significant |
450 | amount of time compared to re-triggering all devices in the system and e.g. can be used to | |
451 | optimize boot time. However, this is not safe to be used in a boot sequence in general. | |
452 | Especially, when udev rules for a device depend on its parent devices (e.g. | |
453 | <literal>ATTRS</literal> or <literal>IMPORT{parent}</literal> keys, see | |
454 | <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry> | |
455 | for more details), the final state of the device becomes easily unstable with this option. | |
456 | </para> | |
457 | </listitem> | |
458 | </varlistentry> | |
792cc203 MH |
459 | <varlistentry> |
460 | <term><option>-w</option></term> | |
461 | <term><option>--settle</option></term> | |
462 | <listitem> | |
463 | <para>Apart from triggering events, also waits for those events to | |
464 | finish. Note that this is different from calling <command>udevadm | |
465 | settle</command>. <command>udevadm settle</command> waits for all | |
466 | events to finish. This option only waits for events triggered by | |
467 | the same command to finish.</para> | |
468 | </listitem> | |
7643ac9a | 469 | </varlistentry> |
730b9c1e LP |
470 | <varlistentry> |
471 | <term><option>--uuid</option></term> | |
472 | <listitem> | |
473 | <para>Trigger the synthetic device events, and associate a randomized UUID with each. These UUIDs | |
474 | are printed to standard output, one line for each event. These UUIDs are included in the uevent | |
475 | environment block (in the <literal>SYNTH_UUID=</literal> property) and may be used to track | |
476 | delivery of the generated events.</para> | |
477 | </listitem> | |
478 | </varlistentry> | |
2001622c YW |
479 | <varlistentry> |
480 | <term><option>--wait-daemon[=<replaceable>SECONDS</replaceable>]</option></term> | |
481 | <listitem> | |
482 | <para>Before triggering uevents, wait for systemd-udevd daemon to be initialized. | |
483 | Optionally takes timeout value. Default timeout is 5 seconds. This is equivalent to invoke | |
484 | invoking <command>udevadm control --ping</command> before <command>udevadm trigger</command>.</para> | |
485 | </listitem> | |
486 | </varlistentry> | |
c94c581c | 487 | |
c94c581c | 488 | <xi:include href="standard-options.xml" xpointer="help" /> |
63749b1a | 489 | </variablelist> |
80877656 | 490 | |
5b3b0733 YW |
491 | <para>In addition, optional positional arguments can be used |
492 | to specify device names or sys paths. They must start with | |
3b121157 | 493 | <filename>/dev/</filename> or <filename>/sys/</filename> |
80877656 | 494 | respectively.</para> |
63749b1a | 495 | </refsect2> |
225cb03b | 496 | |
80877656 ZJS |
497 | <refsect2><title>udevadm settle |
498 | <arg choice="opt"><replaceable>options</replaceable></arg> | |
499 | </title> | |
63749b1a KS |
500 | <para>Watches the udev event queue, and exits if all current events are handled.</para> |
501 | <variablelist> | |
502 | <varlistentry> | |
7643ac9a ZJS |
503 | <term><option>-t</option></term> |
504 | <term><option>--timeout=<replaceable>SECONDS</replaceable></option></term> | |
63749b1a | 505 | <listitem> |
7643ac9a ZJS |
506 | <para>Maximum number of seconds to wait for the event |
507 | queue to become empty. The default value is 120 seconds. A | |
508 | value of 0 will check if the queue is empty and always | |
2233c270 YK |
509 | return immediately. A non-zero value will return an exit |
510 | code of 0 if queue became empty before timeout was reached, | |
511 | non-zero otherwise.</para> | |
63749b1a KS |
512 | </listitem> |
513 | </varlistentry> | |
63749b1a | 514 | <varlistentry> |
7643ac9a ZJS |
515 | <term><option>-E</option></term> |
516 | <term><option>--exit-if-exists=<replaceable>FILE</replaceable></option></term> | |
63749b1a KS |
517 | <listitem> |
518 | <para>Stop waiting if file exists.</para> | |
519 | </listitem> | |
520 | </varlistentry> | |
c94c581c | 521 | |
c94c581c | 522 | <xi:include href="standard-options.xml" xpointer="help" /> |
63749b1a | 523 | </variablelist> |
18a38822 ZJS |
524 | |
525 | <para>See | |
526 | <citerefentry><refentrytitle>systemd-udev-settle.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
527 | for more information.</para> | |
63749b1a | 528 | </refsect2> |
225cb03b | 529 | |
c94c581c | 530 | <refsect2><title>udevadm control <replaceable>option</replaceable></title> |
63749b1a KS |
531 | <para>Modify the internal state of the running udev daemon.</para> |
532 | <variablelist> | |
ff2c503d | 533 | <varlistentry> |
bd8420c5 | 534 | <term><option>-e</option></term> |
ff2c503d KS |
535 | <term><option>--exit</option></term> |
536 | <listitem> | |
6371db93 YW |
537 | <para>Signal and wait for systemd-udevd to exit. No option except for |
538 | <option>--timeout</option> can be specified after this option. | |
539 | Note that <filename>systemd-udevd.service</filename> contains | |
540 | <option>Restart=always</option> and so as a result, this option restarts systemd-udevd. | |
d0d7e102 YW |
541 | If you want to stop <filename>systemd-udevd.service</filename>, please use the following: |
542 | <programlisting>systemctl stop systemd-udevd-control.socket systemd-udevd-kernel.socket systemd-udevd.service</programlisting> | |
543 | </para> | |
ff2c503d KS |
544 | </listitem> |
545 | </varlistentry> | |
63749b1a | 546 | <varlistentry> |
7643ac9a | 547 | <term><option>-l</option></term> |
027f96c8 | 548 | <term><option>--log-level=<replaceable>value</replaceable></option></term> |
63749b1a | 549 | <listitem> |
e03234a1 ZJS |
550 | <para>Set the internal log level of |
551 | <filename>systemd-udevd</filename>. Valid values are the | |
552 | numerical syslog priorities or their textual | |
553 | representations: <option>emerg</option>, | |
554 | <option>alert</option>, <option>crit</option>, | |
555 | <option>err</option>, <option>warning</option>, | |
556 | <option>notice</option>, <option>info</option>, and | |
557 | <option>debug</option>.</para> | |
63749b1a KS |
558 | </listitem> |
559 | </varlistentry> | |
560 | <varlistentry> | |
7643ac9a | 561 | <term><option>-s</option></term> |
63749b1a KS |
562 | <term><option>--stop-exec-queue</option></term> |
563 | <listitem> | |
f13b388f | 564 | <para>Signal systemd-udevd to stop executing new events. Incoming events |
63749b1a KS |
565 | will be queued.</para> |
566 | </listitem> | |
567 | </varlistentry> | |
568 | <varlistentry> | |
7643ac9a | 569 | <term><option>-S</option></term> |
63749b1a KS |
570 | <term><option>--start-exec-queue</option></term> |
571 | <listitem> | |
f13b388f | 572 | <para>Signal systemd-udevd to enable the execution of events.</para> |
63749b1a KS |
573 | </listitem> |
574 | </varlistentry> | |
575 | <varlistentry> | |
7643ac9a | 576 | <term><option>-R</option></term> |
7c85d636 | 577 | <term><option>--reload</option></term> |
63749b1a | 578 | <listitem> |
f13b388f | 579 | <para>Signal systemd-udevd to reload the rules files and other databases like the kernel |
7c85d636 KS |
580 | module index. Reloading rules and databases does not apply any changes to already |
581 | existing devices; the new configuration will only be applied to new events.</para> | |
63749b1a KS |
582 | </listitem> |
583 | </varlistentry> | |
584 | <varlistentry> | |
7643ac9a | 585 | <term><option>-p</option></term> |
63749b1a KS |
586 | <term><option>--property=<replaceable>KEY</replaceable>=<replaceable>value</replaceable></option></term> |
587 | <listitem> | |
588 | <para>Set a global property for all events.</para> | |
589 | </listitem> | |
590 | </varlistentry> | |
591 | <varlistentry> | |
7643ac9a | 592 | <term><option>-m</option></term> |
87d55ff6 | 593 | <term><option>--children-max=</option><replaceable>value</replaceable></term> |
63749b1a | 594 | <listitem> |
f13b388f | 595 | <para>Set the maximum number of events, systemd-udevd will handle at the |
63749b1a KS |
596 | same time.</para> |
597 | </listitem> | |
598 | </varlistentry> | |
a82340cc YW |
599 | <varlistentry> |
600 | <term><option>--ping</option></term> | |
601 | <listitem> | |
602 | <para>Send a ping message to systemd-udevd and wait for the reply. This may be useful to check that | |
603 | systemd-udevd daemon is running.</para> | |
604 | </listitem> | |
605 | </varlistentry> | |
ff2c503d | 606 | <varlistentry> |
c94c581c | 607 | <term><option>-t</option></term> |
ff2c503d KS |
608 | <term><option>--timeout=</option><replaceable>seconds</replaceable></term> |
609 | <listitem> | |
7e505069 | 610 | <para>The maximum number of seconds to wait for a reply from systemd-udevd.</para> |
ff2c503d KS |
611 | </listitem> |
612 | </varlistentry> | |
c94c581c | 613 | |
c94c581c | 614 | <xi:include href="standard-options.xml" xpointer="help" /> |
63749b1a KS |
615 | </variablelist> |
616 | </refsect2> | |
225cb03b | 617 | |
80877656 ZJS |
618 | <refsect2><title>udevadm monitor |
619 | <arg choice="opt"><replaceable>options</replaceable></arg> | |
620 | </title> | |
63749b1a KS |
621 | <para>Listens to the kernel uevents and events sent out by a udev rule |
622 | and prints the devpath of the event to the console. It can be used to analyze the | |
623 | event timing, by comparing the timestamps of the kernel uevent and the udev event. | |
624 | </para> | |
625 | <variablelist> | |
626 | <varlistentry> | |
7643ac9a | 627 | <term><option>-k</option></term> |
63749b1a KS |
628 | <term><option>--kernel</option></term> |
629 | <listitem> | |
630 | <para>Print the kernel uevents.</para> | |
631 | </listitem> | |
632 | </varlistentry> | |
633 | <varlistentry> | |
7643ac9a | 634 | <term><option>-u</option></term> |
63749b1a KS |
635 | <term><option>--udev</option></term> |
636 | <listitem> | |
637 | <para>Print the udev event after the rule processing.</para> | |
638 | </listitem> | |
639 | </varlistentry> | |
640 | <varlistentry> | |
7643ac9a | 641 | <term><option>-p</option></term> |
63749b1a KS |
642 | <term><option>--property</option></term> |
643 | <listitem> | |
644 | <para>Also print the properties of the event.</para> | |
645 | </listitem> | |
646 | </varlistentry> | |
647 | <varlistentry> | |
7643ac9a | 648 | <term><option>-s</option></term> |
63749b1a KS |
649 | <term><option>--subsystem-match=<replaceable>string[/string]</replaceable></option></term> |
650 | <listitem> | |
a9bc94e5 YW |
651 | <para>Filter kernel uevents and udev events by subsystem[/devtype]. Only events with a matching subsystem value will pass. |
652 | When this option is specified more than once, then each matching result is ORed, that is, all devices in the specified | |
653 | subsystems are monitored.</para> | |
63749b1a KS |
654 | </listitem> |
655 | </varlistentry> | |
656 | <varlistentry> | |
7643ac9a | 657 | <term><option>-t</option></term> |
63749b1a KS |
658 | <term><option>--tag-match=<replaceable>string</replaceable></option></term> |
659 | <listitem> | |
a9bc94e5 YW |
660 | <para>Filter udev events by tag. Only udev events with a given tag attached will pass. |
661 | When this option is specified more than once, then each matching result is ORed, that is, devices which have one of the | |
662 | specified tags are monitored.</para> | |
63749b1a KS |
663 | </listitem> |
664 | </varlistentry> | |
c94c581c | 665 | |
c94c581c | 666 | <xi:include href="standard-options.xml" xpointer="help" /> |
63749b1a KS |
667 | </variablelist> |
668 | </refsect2> | |
225cb03b | 669 | |
80877656 ZJS |
670 | <refsect2><title>udevadm test |
671 | <arg choice="opt"><replaceable>options</replaceable></arg> | |
f4f32495 | 672 | <arg choice="opt"><replaceable>devpath</replaceable>|<replaceable>file</replaceable>|<replaceable>unit</replaceable></arg> |
80877656 | 673 | </title> |
63749b1a KS |
674 | <para>Simulate a udev event run for the given device, and print debug output.</para> |
675 | <variablelist> | |
676 | <varlistentry> | |
7643ac9a | 677 | <term><option>-a</option></term> |
6d22bd87 | 678 | <term><option>--action=<replaceable>ACTION</replaceable></option></term> |
63749b1a | 679 | <listitem> |
e148cbc5 YW |
680 | <para>Type of event to be simulated. Possible actions are <literal>add</literal>, |
681 | <literal>remove</literal>, <literal>change</literal>, <literal>move</literal>, | |
682 | <literal>online</literal>, <literal>offline</literal>, <literal>bind</literal>, | |
683 | and <literal>unbind</literal>. Also, the special value <literal>help</literal> can be used | |
684 | to list the possible actions. The default value is <literal>add</literal>.</para> | |
63749b1a KS |
685 | </listitem> |
686 | </varlistentry> | |
687 | <varlistentry> | |
7643ac9a | 688 | <term><option>-N</option></term> |
124b48b0 | 689 | <term><option>--resolve-names=<constant>early</constant>|<constant>late</constant>|<constant>never</constant></option></term> |
63749b1a | 690 | <listitem> |
124b48b0 ZJS |
691 | <para>Specify when udevadm should resolve names of users |
692 | and groups. When set to <constant>early</constant> (the | |
72f4d966 JE |
693 | default), names will be resolved when the rules are |
694 | parsed. When set to <constant>late</constant>, names will | |
124b48b0 | 695 | be resolved for every event. When set to |
72f4d966 | 696 | <constant>never</constant>, names will never be resolved |
124b48b0 | 697 | and all devices will be owned by root.</para> |
63749b1a KS |
698 | </listitem> |
699 | </varlistentry> | |
c94c581c | 700 | |
c94c581c | 701 | <xi:include href="standard-options.xml" xpointer="help" /> |
63749b1a KS |
702 | </variablelist> |
703 | </refsect2> | |
d7867b31 | 704 | |
80877656 ZJS |
705 | <refsect2><title>udevadm test-builtin |
706 | <arg choice="opt"><replaceable>options</replaceable></arg> | |
707 | <arg><replaceable>command</replaceable></arg> | |
f4f32495 | 708 | <arg choice="opt"><replaceable>devpath</replaceable>|<replaceable>file</replaceable>|<replaceable>unit</replaceable></arg> |
80877656 | 709 | </title> |
7643ac9a ZJS |
710 | <para>Run a built-in command <replaceable>COMMAND</replaceable> |
711 | for device <replaceable>DEVPATH</replaceable>, and print debug | |
712 | output.</para> | |
d7867b31 | 713 | <variablelist> |
7ce05a8d YW |
714 | <varlistentry> |
715 | <term><option>-a</option></term> | |
716 | <term><option>--action=<replaceable>ACTION</replaceable></option></term> | |
717 | <listitem> | |
718 | <para>Type of event to be simulated. Possible actions are <literal>add</literal>, | |
719 | <literal>remove</literal>, <literal>change</literal>, <literal>move</literal>, | |
720 | <literal>online</literal>, <literal>offline</literal>, <literal>bind</literal>, | |
721 | and <literal>unbind</literal>. Also, the special value <literal>help</literal> can be used | |
722 | to list the possible actions. The default value is <literal>add</literal>.</para> | |
723 | </listitem> | |
724 | </varlistentry> | |
725 | ||
c94c581c | 726 | <xi:include href="standard-options.xml" xpointer="help" /> |
d7867b31 KS |
727 | </variablelist> |
728 | </refsect2> | |
aa2b0d8d YW |
729 | |
730 | <refsect2> | |
731 | <title>udevadm wait | |
732 | <arg choice="opt"><replaceable>options</replaceable></arg> | |
733 | <arg choice="opt"><replaceable>device|syspath</replaceable></arg> | |
734 | … | |
735 | </title> | |
736 | ||
737 | <para>Wait for devices or device symlinks being created and initialized by | |
738 | <command>systemd-udevd</command>. Each device path must start with | |
739 | <literal>/dev/</literal> or <literal>/sys/</literal>, e.g. <literal>/dev/sda</literal>, | |
740 | <literal>/dev/disk/by-path/pci-0000:3c:00.0-nvme-1-part1</literal>, | |
741 | <literal>/sys/devices/pci0000:00/0000:00:1f.6/net/eth0</literal>, or | |
742 | <literal>/sys/class/net/eth0</literal>. This can take multiple devices. This may be useful for | |
743 | waiting for devices being processed by <command>systemd-udevd</command> after e.g. partitioning | |
744 | or formatting the devices.</para> | |
745 | ||
746 | <variablelist> | |
747 | <varlistentry> | |
748 | <term><option>-t</option></term> | |
749 | <term><option>--timeout=<replaceable>SECONDS</replaceable></option></term> | |
750 | <listitem> | |
751 | <para>Maximum number of seconds to wait for the specified devices or device symlinks being | |
752 | created, initialized, or removed. The default value is <literal>infinity</literal>.</para> | |
753 | </listitem> | |
754 | </varlistentry> | |
755 | ||
756 | <varlistentry> | |
757 | <term><option>--initialized=<replaceable>BOOL</replaceable></option></term> | |
758 | <listitem> | |
759 | <para>Check if <command>systemd-udevd</command> initialized devices. Defaults to true. When | |
760 | false, the command only checks if the specified devices exist. Set false to this setting if | |
761 | there is no udev rules for the specified devices, as the devices will never be considered | |
762 | as initialized in that case. See Initialized Devices section below for more details.</para> | |
763 | </listitem> | |
764 | </varlistentry> | |
765 | ||
766 | <varlistentry> | |
767 | <term><option>--removed</option></term> | |
768 | <listitem> | |
769 | <para>When specified, the command wait for devices being removed instead of created or | |
770 | initialized. If this is specified, <option>--initialized=</option> will be ignored.</para> | |
771 | </listitem> | |
772 | </varlistentry> | |
773 | ||
774 | <varlistentry> | |
775 | <term><option>--settle</option></term> | |
776 | <listitem> | |
777 | <para>When specified, also watches the udev event queue, and wait for all queued events | |
778 | being processed by <command>systemd-udevd</command>.</para> | |
779 | </listitem> | |
780 | </varlistentry> | |
781 | ||
782 | <xi:include href="standard-options.xml" xpointer="help" /> | |
783 | </variablelist> | |
784 | </refsect2> | |
ae61c53c LP |
785 | |
786 | <refsect2> | |
787 | <title>udevadm lock | |
788 | <arg choice="opt"><replaceable>options</replaceable></arg> | |
789 | <arg choice="opt"><replaceable>command</replaceable></arg> | |
790 | … | |
791 | </title> | |
792 | ||
793 | <para><command>udevadm lock</command> takes an (advisory) exclusive lock(s) on a block device (or | |
e7e25c21 | 794 | multiple thereof), as per <ulink url="https://systemd.io/BLOCK_DEVICE_LOCKING">Locking Block Device |
ae61c53c LP |
795 | Access</ulink> and invokes a program with the lock(s) taken. When the invoked program exits the lock(s) |
796 | are automatically released.</para> | |
797 | ||
798 | <para>This tool is in particular useful to ensure that | |
799 | <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
800 | does not probe a block device while changes are made to it, for example partitions created or file | |
801 | systems formatted. Note that many tools that interface with block devices natively support taking | |
802 | relevant locks, see for example | |
ff9412c1 | 803 | <citerefentry project='man-pages'><refentrytitle>sfdisk</refentrytitle><manvolnum>8</manvolnum></citerefentry>'s |
ae61c53c LP |
804 | <option>--lock</option> switch.</para> |
805 | ||
806 | <para>The command expects at least one block device specified via <option>--device=</option> or | |
807 | <option>--backing=</option>, and a command line to execute as arguments.</para> | |
808 | ||
809 | <variablelist> | |
810 | <varlistentry> | |
811 | <term><option>--device=<replaceable>DEVICE</replaceable></option></term> | |
812 | <term><option>-d <replaceable>DEVICE</replaceable></option></term> | |
813 | ||
814 | <listitem><para>Takes a path to a device node of the device to lock. This switch may be used | |
815 | multiple times (and in combination with <option>--backing=</option>) in order to lock multiple | |
816 | devices. If a partition block device node is specified the containing "whole" block device is | |
817 | automatically determined and used for the lock, as per the specification. If multiple devices are | |
818 | specified, they are deduplicated, sorted by the major/minor of their device nodes and then locked | |
819 | in order.</para> | |
820 | ||
821 | <para>This switch must be used at least once, to specify at least one device to | |
822 | lock. (Alternatively, use <option>--backing=</option>, see below.)</para></listitem> | |
823 | </varlistentry> | |
824 | ||
825 | <varlistentry> | |
826 | <term><option>--backing=<replaceable>PATH</replaceable></option></term> | |
827 | <term><option>-b <replaceable>PATH</replaceable></option></term> | |
828 | ||
829 | <listitem><para>If a path to a device node is specified, identical to | |
830 | <option>--device=</option>. However, this switch alternatively accepts a path to a regular file or | |
831 | directory, in which case the block device of the file system the file/directory resides on is | |
832 | automatically determined and used as if it was specified with | |
833 | <option>--device=</option>.</para></listitem> | |
834 | </varlistentry> | |
835 | ||
836 | <varlistentry> | |
837 | <term><option>--timeout=<replaceable>SECS</replaceable></option></term> | |
838 | <term><option>-t <replaceable>SECS</replaceable></option></term> | |
839 | ||
840 | <listitem><para>Specifies how long to wait at most until all locks can be taken. Takes a value in | |
841 | seconds, or in the usual supported time units, see | |
842 | <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>. If | |
843 | specified as zero the lock is attempted and if not successful the invocation will immediately | |
844 | fail. If passed as <literal>infinity</literal> (the default) the invocation will wait indefinitely | |
845 | until the lock can be acquired. If the lock cannot be taken in the specified time the specified | |
846 | command will not be executed and the invocation will fail.</para></listitem> | |
847 | </varlistentry> | |
848 | ||
849 | <varlistentry> | |
850 | <term><option>--print</option></term> | |
851 | <term><option>-p</option></term> | |
852 | ||
853 | <listitem><para>Instead of locking the specified device(s) and executing a command, just print the | |
854 | device path(s) that would be locked, and execute no command. This command is useful to determine | |
855 | the "whole" block device in case a partition block device is specified. The devices will be sorted | |
856 | by their device node major number as primary ordering key and the minor number as secondary | |
857 | ordering key (i.e. they are shown in the order they'd be locked). Note that the number of lines | |
858 | printed here can be less than the the number of <option>--device=</option> and | |
859 | <option>--backing=</option> switches specified in case these resolve to the same "whole" | |
860 | devices.</para></listitem> | |
861 | </varlistentry> | |
862 | ||
863 | <xi:include href="standard-options.xml" xpointer="help" /> | |
864 | </variablelist> | |
865 | </refsect2> | |
aa2b0d8d YW |
866 | </refsect1> |
867 | ||
868 | <refsect1> | |
869 | <title>Initialized Devices</title> | |
870 | ||
871 | <para>Initialized devices are those for which at least one udev rule already completed execution | |
872 | – for any action but <literal>remove</literal> — that set a property or other device setting (and | |
873 | thus has an entry in the udev device database). Devices are no longer considered initialized if a | |
874 | <literal>remove</literal> action is seen for them (which removes their entry in the udev device | |
875 | database). Note that devices that have no udev rules are never considered initialized, but might | |
876 | still be announced via the sd-device API (or similar).</para> | |
63749b1a | 877 | </refsect1> |
225cb03b | 878 | |
ae61c53c LP |
879 | <refsect1> |
880 | <title>Example</title> | |
881 | ||
882 | <example> | |
883 | <title>Format a File System</title> | |
884 | ||
885 | <para>Take a lock on the backing block device while creating a file system, to ensure that | |
886 | <command>systemd-udevd</command> doesn't probe or announce the new superblock before it is | |
887 | comprehensively written:</para> | |
888 | ||
889 | <programlisting># udevadm lock --device=/dev/sda1 mkfs.ext4 /dev/sda1</programlisting> | |
890 | </example> | |
891 | ||
892 | <example> | |
893 | <title>Format a RAID File System</title> | |
894 | ||
895 | <para>Similar, but take locks on multiple devices at once:</para> | |
896 | ||
897 | <programlisting># udevadm lock --device=/dev/sda1 --device=/dev/sdb1 mkfs.btrfs /dev/sda1 /dev/sdb1</programlisting> | |
898 | </example> | |
899 | ||
900 | <example> | |
901 | <title>Copy in a File System</title> | |
902 | ||
903 | <para>Take a lock on the backing block device while copying in a prepared file system image, to ensure | |
904 | that <command>systemd-udevd</command> doesn't probe or announce the new superblock before it is fully | |
905 | written:</para> | |
906 | ||
907 | <programlisting># udevadm lock -d /dev/sda1 dd if=fs.raw of=/dev/sda1</programlisting> | |
908 | </example> | |
909 | </refsect1> | |
910 | ||
63749b1a KS |
911 | <refsect1> |
912 | <title>See Also</title> | |
913 | <para><citerefentry> | |
914 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
7d06ef0a | 915 | </citerefentry>, |
63749b1a | 916 | <citerefentry> |
b79f817b | 917 | <refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum> |
63749b1a KS |
918 | </citerefentry></para> |
919 | </refsect1> | |
920 | </refentry> |