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udevadm: allow a .device unit to be specified for query and trigger
This is convenient when working with device units in systemd. Instead of converting the systemd unit name to a path to feed to udevadm, udevadm info|trigger can be called directly on the unit name. The man page is reworked a bit to describe the modern syntax with positional arguments first. It's just simpler to use than the positional options.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
parent
d539f79176
commit
b6854081ff
@ -76,39 +76,40 @@
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<refsect2><title>udevadm info
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<arg choice="opt"><replaceable>options</replaceable></arg>
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<arg choice="opt"><replaceable>devpath</replaceable>|<replaceable>file</replaceable></arg>
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<arg choice="opt"><replaceable>devpath</replaceable>|<replaceable>file</replaceable>|<replaceable>unit</replaceable></arg>
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</title>
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<para>Queries the udev database for device information
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stored in the udev database. It can also query the properties
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of a device from its sysfs representation to help creating udev
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rules that match this device.</para>
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<para>Query the udev database for device information.</para>
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<para>A positional argument should be used to specify a device. It may be a device name (in which case
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it must start with <filename>/dev/</filename>), a sys path (in which case it must start with
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<filename>/sys/</filename>), or a systemd device unit name (in which case it must end with
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<literal>.device</literal>, see
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<citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
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</para>
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<variablelist>
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<varlistentry>
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<term><option>-q</option></term>
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<term><option>--query=<replaceable>TYPE</replaceable></option></term>
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<listitem>
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<para>Query the database for the specified type of device
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data. It needs the <option>--path</option> or
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<option>--name</option> to identify the specified device.
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<para>Query the database for the specified type of device data.
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Valid <replaceable>TYPE</replaceable>s are:
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<constant>name</constant>, <constant>symlink</constant>,
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<constant>path</constant>, <constant>property</constant>,
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<constant>all</constant>.</para>
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</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>--path=<replaceable>DEVPATH</replaceable></option></term>
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<listitem>
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<para>The <filename>/sys</filename> path of the device to
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query, e.g.
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<filename><optional>/sys</optional>/class/block/sda</filename>.
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Note that this option usually is not very useful, since
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<command>udev</command> can guess the type of the
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argument, so <command>udevadm info
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--path=/class/block/sda</command> is equivalent to
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<command>udevadm info /sys/class/block/sda</command>.</para>
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<para>The <filename>/sys</filename> path of the device to query, e.g.
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<filename><optional>/sys</optional>/class/block/sda</filename>. This option is an alternative to
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the positional argument with a <filename>/sys/</filename> prefix. <command>udevadm info
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--path=/class/block/sda</command> is equivalent to <command>udevadm info
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/sys/class/block/sda</command>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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@ -116,11 +117,9 @@
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<term><option>--name=<replaceable>FILE</replaceable></option></term>
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<listitem>
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<para>The name of the device node or a symlink to query,
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e.g. <filename><optional>/dev</optional>/sda</filename>.
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Note that this option usually is not very useful, since
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<command>udev</command> can guess the type of the
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argument, so <command>udevadm info --name=sda</command> is
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equivalent to <command>udevadm info /dev/sda</command>.</para>
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e.g. <filename><optional>/dev</optional>/sda</filename>. This option is an alternative to the
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positional argument with a <filename>/dev/</filename> prefix. <command>udevadm info
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--name=sda</command> is equivalent to <command>udevadm info /dev/sda</command>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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@ -179,17 +178,17 @@
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<xi:include href="standard-options.xml" xpointer="help" />
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</variablelist>
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<para>In addition, an optional positional argument can be used
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to specify a device name or a sys path. It must start with
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<filename>/dev</filename> or <filename>/sys</filename>
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respectively.</para>
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</refsect2>
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<refsect2><title>udevadm trigger
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<arg choice="opt"><replaceable>options</replaceable></arg>
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<arg choice="opt" rep="repeat"><replaceable>devpath</replaceable>|<replaceable>file</replaceable></arg></title>
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<arg choice="opt" rep="repeat"><replaceable>devpath</replaceable>|<replaceable>file</replaceable>|<replaceable>unit</replaceable></arg>
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</title>
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<para>Request device events from the kernel. Primarily used to replay events at system coldplug time.</para>
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<para>Takes one or more device specifications as arguments. See the description of <command>info</command>
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above.</para>
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<variablelist>
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<varlistentry>
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<term><option>-v</option></term>
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@ -440,7 +440,7 @@ int info_main(int argc, char *argv[], void *userdata) {
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r = find_device(argv[optind], NULL, &device);
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if (r == -EINVAL)
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return log_error_errno(r, "Bad argument \"%s\", an absolute path in /dev/ or /sys expected: %m",
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return log_error_errno(r, "Bad argument \"%s\", expected an absolute path in /dev/ or /sys or a unit name: %m",
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argv[optind]);
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if (r < 0)
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return log_error_errno(r, "Unknown device \"%s\": %m", argv[optind]);
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@ -6,18 +6,31 @@
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#include "device-private.h"
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#include "path-util.h"
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#include "udevadm-util.h"
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#include "unit-name.h"
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int find_device(const char *id, const char *prefix, sd_device **ret) {
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_cleanup_free_ char *buf = NULL;
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_cleanup_free_ char *path = NULL;
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int r;
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assert(id);
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assert(ret);
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if (prefix && !path_startswith(id, prefix)) {
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buf = path_join(prefix, id);
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if (!buf)
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return -ENOMEM;
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id = buf;
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if (prefix) {
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if (!path_startswith(id, prefix)) {
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id = path = path_join(prefix, id);
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if (!path)
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return -ENOMEM;
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}
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} else {
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/* In cases where the argument is generic (no prefix specified),
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* check if the argument looks like a device unit name. */
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if (unit_name_is_valid(id, UNIT_NAME_PLAIN) &&
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unit_name_to_type(id) == UNIT_DEVICE) {
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r = unit_name_to_path(id, &path);
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if (r < 0)
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return log_debug_errno(r, "Failed to convert \"%s\" to a device path: %m", id);
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id = path;
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}
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}
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if (path_startswith(id, "/sys/"))
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