man/udevadm.xml

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   6 <refentry id="udevadm">
   7   <refentryinfo>
   8     <title>udevadm</title>
   9     <productname>systemd</productname>
  10     <authorgroup>
  11       <author>
  12         <contrib>Developer</contrib>
  13         <firstname>Kay</firstname>
  14         <surname>Sievers</surname>
  15         <email>kay@vrfy.org</email>
  16       </author>
  17     </authorgroup>
  18   </refentryinfo>
  19
  20   <refmeta>
  21     <refentrytitle>udevadm</refentrytitle>
  22     <manvolnum>8</manvolnum>
  23   </refmeta>
  24
  25   <refnamediv>
  26     <refname>udevadm</refname><refpurpose>udev management tool</refpurpose>
  27   </refnamediv>
  28
  29   <refsynopsisdiv>
  30     <cmdsynopsis>
  31       <command>udevadm</command>
  32         <arg><option>--debug</option></arg>
  33         <arg><option>--version</option></arg>
  34         <arg><option>--help</option></arg>
  35     </cmdsynopsis>
  36     <cmdsynopsis>
  37       <command>udevadm info <replaceable>options</replaceable></command>
  38     </cmdsynopsis>
  39     <cmdsynopsis>
  40       <command>udevadm trigger <optional>options</optional></command>
  41     </cmdsynopsis>
  42     <cmdsynopsis>
  43       <command>udevadm settle <optional>options</optional></command>
  44     </cmdsynopsis>
  45     <cmdsynopsis>
  46       <command>udevadm control <replaceable>command</replaceable></command>
  47     </cmdsynopsis>
  48     <cmdsynopsis>
  49       <command>udevadm monitor <optional>options</optional></command>
  50     </cmdsynopsis>
  51     <cmdsynopsis>
  52       <command>udevadm hwdb <optional>options</optional></command>
  53     </cmdsynopsis>
  54     <cmdsynopsis>
  55       <command>udevadm test <optional>options</optional> <replaceable>devpath</replaceable></command>
  56     </cmdsynopsis>
  57     <cmdsynopsis>
  58       <command>udevadm test-builtin <optional>options</optional> <replaceable>command</replaceable> <replaceable>devpath</replaceable></command>
  59     </cmdsynopsis>
  60   </refsynopsisdiv>
  61
  62   <refsect1><title>Description</title>
  63     <para><command>udevadm</command> expects a command and command
  64     specific options.  It controls the runtime behavior of
  65     <command>systemd-udevd</command>, requests kernel events, manages
  66     the event queue, and provides simple debugging mechanisms.</para>
  67   </refsect1>
  68
  69   <refsect1><title>Options</title>
  70     <variablelist>
  71       <varlistentry>
  72         <term><option>--debug</option></term>
  73         <listitem>
  74           <para>Print debug messages to standard error.</para>
  75         </listitem>
  76       </varlistentry>
  77       <varlistentry>
  78         <term><option>--version</option></term>
  79         <listitem>
  80           <para>Print version number.</para>
  81         </listitem>
  82       </varlistentry>
  83       <varlistentry>
  84         <term><option>-h</option></term>
  85         <term><option>--help</option></term>
  86         <listitem>
  87           <para>Print help text.</para>
  88         </listitem>
  89       </varlistentry>
  90     </variablelist>
  91
  92     <refsect2><title>udevadm info
  93       <arg choice="opt"><replaceable>options</replaceable></arg>
  94       <arg choice="opt"><replaceable>devpath</replaceable>|<replaceable>file</replaceable></arg>
  95     </title>
  96
  97       <para>Queries the udev database for device information
  98       stored in the udev database. It can also query the properties
  99       of a device from its sysfs representation to help creating udev
 100       rules that match this device.</para>
 101       <variablelist>
 102         <varlistentry>
 103           <term><option>-q</option></term>
 104           <term><option>--query=<replaceable>TYPE</replaceable></option></term>
 105           <listitem>
 106             <para>Query the database for the specified type of device
 107             data. It needs the <option>--path</option> or
 108             <option>--name</option> to identify the specified device.
 109             Valid <replaceable>TYPE</replaceable>s are:
 110             <constant>name</constant>, <constant>symlink</constant>,
 111             <constant>path</constant>, <constant>property</constant>,
 112             <constant>all</constant>.</para>
 113           </listitem>
 114         </varlistentry>
 115         <varlistentry>
 116           <term><option>-p</option></term>
 117           <term><option>--path=<replaceable>DEVPATH</replaceable></option></term>
 118           <listitem>
 119             <para>The <filename>/sys</filename> path of the device to
 120             query, e.g.
 121             <filename><optional>/sys</optional>/class/block/sda</filename>.
 122             Note that this option usually is not very useful, since
 123             <command>udev</command> can guess the type of the
 124             argument, so <command>udevadm
 125             --devpath=/class/block/sda</command> is equivalent to
 126             <command>udevadm /sys/class/block/sda</command>.</para>
 127           </listitem>
 128         </varlistentry>
 129         <varlistentry>
 130           <term><option>-n</option></term>
 131           <term><option>--name=<replaceable>FILE</replaceable></option></term>
 132           <listitem>
 133             <para>The name of the device node or a symlink to query,
 134             e.g. <filename><optional>/dev</optional>/sda</filename>.
 135             Note that this option usually is not very useful, since
 136             <command>udev</command> can guess the type of the
 137             argument, so <command>udevadm --name=sda</command> is
 138             equivalent to <command>udevadm /dev/sda</command>.</para>
 139           </listitem>
 140         </varlistentry>
 141         <varlistentry>
 142           <term><option>-r</option></term>
 143           <term><option>--root</option></term>
 144           <listitem>
 145             <para>Print absolute paths in <command>name</command> or <command>symlink</command>
 146             query.</para>
 147           </listitem>
 148         </varlistentry>
 149         <varlistentry>
 150           <term><option>-a</option></term>
 151           <term><option>--attribute-walk</option></term>
 152           <listitem>
 153             <para>Print all sysfs properties of the specified device that can be used
 154             in udev rules to match the specified device. It prints all devices
 155             along the chain, up to the root of sysfs that can be used in udev rules.</para>
 156           </listitem>
 157         </varlistentry>
 158         <varlistentry>
 159           <term><option>-x</option></term>
 160           <term><option>--export</option></term>
 161           <listitem>
 162             <para>Print output as key/value pairs. Values are enclosed in single quotes.</para>
 163           </listitem>
 164         </varlistentry>
 165         <varlistentry>
 166           <term><option>-P</option></term>
 167           <term><option>--export-prefix=<replaceable>NAME</replaceable></option></term>
 168           <listitem>
 169             <para>Add a prefix to the key name of exported values.</para>
 170           </listitem>
 171         </varlistentry>
 172         <varlistentry>
 173           <term><option>-d</option></term>
 174           <term><option>--device-id-of-file=<replaceable>FILE</replaceable></option></term>
 175           <listitem>
 176             <para>Print major/minor numbers of the underlying device, where the file
 177             lives on.</para>
 178           </listitem>
 179         </varlistentry>
 180         <varlistentry>
 181           <term><option>-e</option></term>
 182           <term><option>--export-db</option></term>
 183           <listitem>
 184             <para>Export the content of the udev database.</para>
 185           </listitem>
 186         </varlistentry>
 187         <varlistentry>
 188           <term><option>-c</option></term>
 189           <term><option>--cleanup-db</option></term>
 190           <listitem>
 191             <para>Cleanup the udev database.</para>
 192           </listitem>
 193         </varlistentry>
 194         <varlistentry>
 195           <term><option>--version</option></term>
 196           <listitem>
 197             <para>Print version.</para>
 198           </listitem>
 199         </varlistentry>
 200         <varlistentry>
 201           <term><option>-h</option></term>
 202           <term><option>--help</option></term>
 203           <listitem>
 204             <para>Print help text.</para>
 205           </listitem>
 206         </varlistentry>
 207       </variablelist>
 208
 209       <para>In addition an optional positional argument can be used
 210       to specify a device name or a sys path. It must start with
 211       <filename>/dev</filename> or <filename>/sys</filename>
 212       respectively.</para>
 213     </refsect2>
 214
 215     <refsect2><title>udevadm trigger
 216       <arg choice="opt"><replaceable>options</replaceable></arg>
 217       <arg choice="opt" rep="repeat"><replaceable>devpath</replaceable>|<replaceable>file</replaceable></arg></title>
 218       <para>Request device events from the kernel. Primarily used to replay events at system coldplug time.</para>
 219       <variablelist>
 220         <varlistentry>
 221           <term><option>-v</option></term>
 222           <term><option>--verbose</option></term>
 223           <listitem>
 224             <para>Print the list of devices which will be triggered.</para>
 225           </listitem>
 226         </varlistentry>
 227         <varlistentry>
 228           <term><option>-n</option></term>
 229           <term><option>--dry-run</option></term>
 230           <listitem>
 231             <para>Do not actually trigger the event.</para>
 232           </listitem>
 233         </varlistentry>
 234         <varlistentry>
 235           <term><option>-t</option></term>
 236           <term><option>--type=<replaceable>TYPE</replaceable></option></term>
 237           <listitem>
 238             <para>Trigger a specific type of devices. Valid types are:
 239             <command>devices</command>, <command>subsystems</command>.
 240             The default value is <command>devices</command>.</para>
 241           </listitem>
 242         </varlistentry>
 243         <varlistentry>
 244           <term><option>-c</option></term>
 245           <term><option>--action=<replaceable>ACTION</replaceable></option></term>
 246           <listitem>
 247             <para>Type of event to be triggered. The default value is
 248             <command>change</command>.</para>
 249           </listitem>
 250         </varlistentry>
 251         <varlistentry>
 252           <term><option>-s</option></term>
 253           <term><option>--subsystem-match=<replaceable>SUBSYSTEM</replaceable></option></term>
 254           <listitem>
 255             <para>Trigger events for devices which belong to a
 256             matching subsystem. This option can be specified multiple
 257             times and supports shell style pattern matching.</para>
 258           </listitem>
 259         </varlistentry>
 260         <varlistentry>
 261           <term><option>-S</option></term>
 262           <term><option>--subsystem-nomatch=<replaceable>SUBSYSTEM</replaceable></option></term>
 263           <listitem>
 264             <para>Do not trigger events for devices which belong to a matching subsystem. This option
 265             can be specified multiple times and supports shell style pattern matching.</para>
 266           </listitem>
 267         </varlistentry>
 268         <varlistentry>
 269           <term><option>-a</option></term>
 270           <term><option>--attr-match=<replaceable>ATTRIBUTE</replaceable>=<replaceable>VALUE</replaceable></option></term>
 271           <listitem>
 272             <para>Trigger events for devices with a matching sysfs
 273             attribute. If a value is specified along with the
 274             attribute name, the content of the attribute is matched
 275             against the given value using shell style pattern
 276             matching. If no value is specified, the existence of the
 277             sysfs attribute is checked. This option can be specified
 278             multiple times.</para>
 279           </listitem>
 280         </varlistentry>
 281         <varlistentry>
 282           <term><option>-A</option></term>
 283           <term><option>--attr-nomatch=<replaceable>ATTRIBUTE</replaceable>=<replaceable>VALUE</replaceable></option></term>
 284           <listitem>
 285             <para>Do not trigger events for devices with a matching
 286             sysfs attribute. If a value is specified along with the
 287             attribute name, the content of the attribute is matched
 288             against the given value using shell style pattern
 289             matching. If no value is specified, the existence of the
 290             sysfs attribute is checked. This option can be specified
 291             multiple times.</para>
 292           </listitem>
 293         </varlistentry>
 294         <varlistentry>
 295           <term><option>-p</option></term>
 296           <term><option>--property-match=<replaceable>PROPERTY</replaceable>=<replaceable>VALUE</replaceable></option></term>
 297           <listitem>
 298             <para>Trigger events for devices with a matching property
 299             value. This option can be specified multiple times and
 300             supports shell style pattern matching.</para>
 301           </listitem>
 302         </varlistentry>
 303         <varlistentry>
 304           <term><option>-g</option></term>
 305           <term><option>--tag-match=<replaceable>PROPERTY</replaceable></option></term>
 306           <listitem>
 307             <para>Trigger events for devices with a matching tag. This
 308             option can be specified multiple times.</para>
 309           </listitem>
 310         </varlistentry>
 311         <varlistentry>
 312           <term><option>-y</option></term>
 313           <term><option>--sysname-match=<replaceable>PATH</replaceable></option></term>
 314           <listitem>
 315             <para>Trigger events for devices with a matching sys
 316             device path. This option can be specified multiple times
 317             and supports shell style pattern matching.</para>
 318           </listitem>
 319         </varlistentry>
 320         <varlistentry>
 321           <term><option>--name-match=<replaceable>NAME</replaceable></option></term>
 322           <listitem>
 323             <para>Trigger events for devices with a matching
 324             device path. This options can be specified multiple
 325             times.</para>
 326           </listitem>
 327         </varlistentry>
 328         <varlistentry>
 329           <term><option>-b</option></term>
 330           <term><option>--parent-match=<replaceable>SYSPATH</replaceable></option></term>
 331           <listitem>
 332             <para>Trigger events for all children of a given
 333             device.</para>
 334           </listitem>
 335         </varlistentry>
 336         <varlistentry>
 337           <term><option>-h</option></term>
 338           <term><option>--help</option></term>
 339           <listitem>
 340             <para>Print help text.</para>
 341           </listitem>
 342         </varlistentry>
 343       </variablelist>
 344
 345       <para>In addition optional positional arguments can be used
 346       to specify device names or sys paths. They must start with
 347       <filename>/dev</filename> or <filename>/sys</filename>
 348       respectively.</para>
 349     </refsect2>
 350
 351     <refsect2><title>udevadm settle
 352       <arg choice="opt"><replaceable>options</replaceable></arg>
 353     </title>
 354       <para>Watches the udev event queue, and exits if all current events are handled.</para>
 355       <variablelist>
 356         <varlistentry>
 357           <term><option>-t</option></term>
 358           <term><option>--timeout=<replaceable>SECONDS</replaceable></option></term>
 359           <listitem>
 360             <para>Maximum number of seconds to wait for the event
 361             queue to become empty. The default value is 120 seconds. A
 362             value of 0 will check if the queue is empty and always
 363             return immediately.</para>
 364           </listitem>
 365         </varlistentry>
 366         <varlistentry>
 367           <term><option>-E</option></term>
 368           <term><option>--exit-if-exists=<replaceable>FILE</replaceable></option></term>
 369           <listitem>
 370             <para>Stop waiting if file exists.</para>
 371           </listitem>
 372         </varlistentry>
 373         <varlistentry>
 374           <term><option>-h</option></term>
 375           <term><option>--help</option></term>
 376           <listitem>
 377             <para>Print help text.</para>
 378           </listitem>
 379         </varlistentry>
 380       </variablelist>
 381     </refsect2>
 382
 383     <refsect2><title>udevadm control <replaceable>command</replaceable></title>
 384       <para>Modify the internal state of the running udev daemon.</para>
 385       <variablelist>
 386         <varlistentry>
 387           <term><option>-x</option></term>
 388           <term><option>--exit</option></term>
 389           <listitem>
 390             <para>Signal and wait for systemd-udevd to exit.</para>
 391           </listitem>
 392         </varlistentry>
 393         <varlistentry>
 394           <term><option>-l</option></term>
 395           <term><option>--log-priority=<replaceable>value</replaceable></option></term>
 396           <listitem>
 397             <para>Set the internal log level of
 398             <filename>systemd-udevd</filename>. Valid values are the
 399             numerical syslog priorities or their textual
 400             representations: <option>emerg</option>,
 401             <option>alert</option>, <option>crit</option>,
 402             <option>err</option>, <option>warning</option>,
 403             <option>notice</option>, <option>info</option>, and
 404             <option>debug</option>.</para>
 405           </listitem>
 406         </varlistentry>
 407         <varlistentry>
 408           <term><option>-s</option></term>
 409           <term><option>--stop-exec-queue</option></term>
 410           <listitem>
 411             <para>Signal systemd-udevd to stop executing new events. Incoming events
 412             will be queued.</para>
 413           </listitem>
 414         </varlistentry>
 415         <varlistentry>
 416           <term><option>-S</option></term>
 417           <term><option>--start-exec-queue</option></term>
 418           <listitem>
 419             <para>Signal systemd-udevd to enable the execution of events.</para>
 420           </listitem>
 421         </varlistentry>
 422         <varlistentry>
 423           <term><option>-R</option></term>
 424           <term><option>--reload</option></term>
 425           <listitem>
 426             <para>Signal systemd-udevd to reload the rules files and other databases like the kernel
 427             module index. Reloading rules and databases does not apply any changes to already
 428             existing devices; the new configuration will only be applied to new events.</para>
 429           </listitem>
 430         </varlistentry>
 431         <varlistentry>
 432           <term><option>-p</option></term>
 433           <term><option>--property=<replaceable>KEY</replaceable>=<replaceable>value</replaceable></option></term>
 434           <listitem>
 435             <para>Set a global property for all events.</para>
 436           </listitem>
 437         </varlistentry>
 438         <varlistentry>
 439           <term><option>-m</option></term>
 440           <term><option>--children-max=</option><replaceable>value</replaceable></term>
 441           <listitem>
 442             <para>Set the maximum number of events, systemd-udevd will handle at the
 443             same time.</para>
 444           </listitem>
 445         </varlistentry>
 446         <varlistentry>
 447           <term><option>--timeout=</option><replaceable>seconds</replaceable></term>
 448           <listitem>
 449             <para>The maximum number of seconds to wait for a reply from systemd-udevd.</para>
 450           </listitem>
 451         </varlistentry>
 452         <varlistentry>
 453           <term><option>-h</option></term>
 454           <term><option>--help</option></term>
 455           <listitem>
 456             <para>Print help text.</para>
 457           </listitem>
 458         </varlistentry>
 459       </variablelist>
 460     </refsect2>
 461
 462     <refsect2><title>udevadm monitor
 463       <arg choice="opt"><replaceable>options</replaceable></arg>
 464     </title>
 465       <para>Listens to the kernel uevents and events sent out by a udev rule
 466       and prints the devpath of the event to the console. It can be used to analyze the
 467       event timing, by comparing the timestamps of the kernel uevent and the udev event.
 468       </para>
 469       <variablelist>
 470         <varlistentry>
 471           <term><option>-k</option></term>
 472           <term><option>--kernel</option></term>
 473           <listitem>
 474             <para>Print the kernel uevents.</para>
 475           </listitem>
 476         </varlistentry>
 477         <varlistentry>
 478           <term><option>-u</option></term>
 479           <term><option>--udev</option></term>
 480           <listitem>
 481             <para>Print the udev event after the rule processing.</para>
 482           </listitem>
 483         </varlistentry>
 484         <varlistentry>
 485           <term><option>-p</option></term>
 486           <term><option>--property</option></term>
 487           <listitem>
 488             <para>Also print the properties of the event.</para>
 489           </listitem>
 490         </varlistentry>
 491         <varlistentry>
 492           <term><option>-s</option></term>
 493           <term><option>--subsystem-match=<replaceable>string[/string]</replaceable></option></term>
 494           <listitem>
 495             <para>Filter events by subsystem[/devtype]. Only udev events with a matching subsystem value will pass.</para>
 496           </listitem>
 497         </varlistentry>
 498         <varlistentry>
 499           <term><option>-t</option></term>
 500           <term><option>--tag-match=<replaceable>string</replaceable></option></term>
 501           <listitem>
 502             <para>Filter events by property. Only udev events with a given tag attached will pass.</para>
 503           </listitem>
 504         </varlistentry>
 505         <varlistentry>
 506           <term><option>-h</option></term>
 507           <term><option>--help</option></term>
 508           <listitem>
 509             <para>Print help text.</para>
 510           </listitem>
 511         </varlistentry>
 512       </variablelist>
 513     </refsect2>
 514
 515     <refsect2><title>udevadm hwdb
 516       <arg choice="opt"><replaceable>options</replaceable></arg>
 517     </title>
 518       <para>Maintain the hardware database index in <filename>/etc/udev/hwdb.bin</filename>.</para>
 519       <variablelist>
 520         <varlistentry>
 521           <term><option>-u</option></term>
 522           <term><option>--update</option></term>
 523           <listitem>
 524             <para>Compile the hardware database information located in /usr/lib/udev/hwdb.d/,
 525             /etc/udev/hwdb.d/ and store it in <filename>/etc/udev/hwdb.bin</filename>. This should be done after
 526             any update to the source files; it will not be called automatically. The running
 527             udev daemon will detect a new database on its own and does not need to be
 528             notified about it.</para>
 529           </listitem>
 530         </varlistentry>
 531         <varlistentry>
 532           <term><option>--usr</option></term>
 533           <listitem>
 534             <para>Put the compiled database into <filename>/usr/lib/udev/hwdb.bin</filename> instead.
 535             Use this if you want to ship a pre-compiled database in immutable system images, or
 536             don't use <filename>/etc/udev/hwdb.d</filename> and want to avoid large binary files in
 537             <filename>/etc</filename>.</para>
 538           </listitem>
 539         </varlistentry>
 540         <varlistentry>
 541           <term><option>-t</option></term>
 542           <term><option>--test=<replaceable>string</replaceable></option></term>
 543           <listitem>
 544             <para>Query the database with a modalias string, and print the
 545             retrieved properties.</para>
 546           </listitem>
 547         </varlistentry>
 548         <varlistentry>
 549           <term><option>-r</option></term>
 550           <term><option>--root=<replaceable>string</replaceable></option></term>
 551           <listitem>
 552             <para>Alternative root path in the file system for reading and writing files.</para>
 553           </listitem>
 554         </varlistentry>
 555         <varlistentry>
 556           <term><option>-h</option></term>
 557           <term><option>--help</option></term>
 558           <listitem>
 559             <para>Print help text.</para>
 560           </listitem>
 561         </varlistentry>
 562       </variablelist>
 563     </refsect2>
 564
 565     <refsect2><title>udevadm test
 566       <arg choice="opt"><replaceable>options</replaceable></arg>
 567       <arg><replaceable>devpath</replaceable></arg>
 568     </title>
 569       <para>Simulate a udev event run for the given device, and print debug output.</para>
 570       <variablelist>
 571         <varlistentry>
 572           <term><option>-a</option></term>
 573           <term><option>--action=<replaceable>string</replaceable></option></term>
 574           <listitem>
 575             <para>The action string.</para>
 576           </listitem>
 577         </varlistentry>
 578         <varlistentry>
 579           <term><option>-N</option></term>
 580           <term><option>--resolve-names=<constant>early</constant>|<constant>late</constant>|<constant>never</constant></option></term>
 581           <listitem>
 582             <para>Specify when udevadm should resolve names of users
 583             and groups.  When set to <constant>early</constant> (the
 584             default), names will be resolved when the rules are
 585             parsed. When set to <constant>late</constant>, names will
 586             be resolved for every event. When set to
 587             <constant>never</constant>, names will never be resolved
 588             and all devices will be owned by root.</para>
 589           </listitem>
 590         </varlistentry>
 591         <varlistentry>
 592           <term><option>-h</option></term>
 593           <term><option>--help</option></term>
 594           <listitem>
 595             <para>Print help text.</para>
 596           </listitem>
 597         </varlistentry>
 598       </variablelist>
 599     </refsect2>
 600
 601     <refsect2><title>udevadm test-builtin
 602       <arg choice="opt"><replaceable>options</replaceable></arg>
 603       <arg><replaceable>command</replaceable></arg>
 604       <arg><replaceable>devpath</replaceable></arg>
 605     </title>
 606       <para>Run a built-in command <replaceable>COMMAND</replaceable>
 607       for device <replaceable>DEVPATH</replaceable>, and print debug
 608       output.</para>
 609       <variablelist>
 610         <varlistentry>
 611           <term><option>-h</option></term>
 612           <term><option>--help</option></term>
 613           <listitem>
 614             <para>Print help text.</para>
 615           </listitem>
 616         </varlistentry>
 617       </variablelist>
 618     </refsect2>
 619   </refsect1>
 620
 621   <refsect1>
 622     <title>See Also</title>
 623     <para><citerefentry>
 624         <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum>
 625     </citerefentry>,
 626     <citerefentry>
 627         <refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum>
 628     </citerefentry></para>
 629   </refsect1>
 630 </refentry>