add options to udevtrigger to control scanning

This patch has been in the gentoo tree for a bit. It modifies udevtrigger to allow a little more fine grained control for people who don't want all of the sysfs tree to be scanned by udevtrigger at startup.

Patch was originally written by Martin Schlemmer <[email protected]> but was forward-ported by me to the latest version of udev.

@@ -358,6 +358,9 @@ int main(int argc, char *argv[], char *e
 {
 	int i;
 	int failed = 0;
+	int block = 1;
+	int bus = 1;
+	int class = 1;
 
 	logging_init("udevtrigger");
 	udev_config_init();

@@ -373,8 +376,15 @@ int main(int argc, char *argv[], char *e
 			dry_run = 1;
 		} else if (strcmp(arg, "--retry-failed") = 0 || strcmp(arg, "-F") = 0) {
 			failed = 1;
+		} else if (strcmp(arg, "--no-scan-block") = 0) {
+			block = 0;
+		} else if (strcmp(arg, "--no-scan-bus") = 0) {
+			bus = 0;
+		} else if (strcmp(arg, "--no-scan-class") = 0) {
+			class = 0;
 		} else if (strcmp(arg, "--help") = 0 || strcmp(arg, "-h") = 0) {
-			printf("Usage: udevtrigger [--help] [--verbose] [--dry-run] [--retry-failed]\n");
+			printf("Usage: udevtrigger [--no-scan-block] [--no-scan-bus] [--no-scan-class]\n");
+			printf("                   [--help] [--verbose] [--dry-run] [--retry-failed]\n");
 			goto exit;
 		} else {
 			fprintf(stderr, "unrecognized option '%s'\n", arg);

@@ -386,9 +396,12 @@ int main(int argc, char *argv[], char *e
 		scan_failed();
 	else {
 		/* default action */
-		scan_bus();
-		scan_class();
-		scan_block();
+		if (bus)
+			scan_bus();
+		if (class)
+			scan_class();
+		if (block)
+			scan_block();
 	}
 	exec_lists();
 

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When is it useful to have such options. And "no" flags who negate something from all events sounds pretty odd to me.
The Ubuntu guys use a patch which can filter on values to have control over what is triggered and what not. If we are going that road, I like their patch more than this. But in both cases, please explain in which situations this is really needed?

Thanks,
Kay

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Well, either that or force the --scan-class options to be used :)

Do you have a pointer to where this patch is?

People do not want all of their devices probed for at boot time, they want to load the modules that they know they want, on their own. So they don't want all of the modalias files being poked at.

In short, they don't like the "coldplug" functionality for loading modules and only want udev to handle the device nodes present at boot time. I don't blame them for wanting this because with machines that you know all the hardware, it isn't necessary, and does speed up the boot process ever so slightly.

And yes, they can use the blacklist functionality from module-init-tools, except that seems to be broken right now in the Gentoo releases, and I'm having a hard time figuring out why. It used to work...

So this could be reduced to just the one option, --no-scan-bus, as that is all that Gentoo currently uses. I think the original author was just trying to be nice in giving all possible options :)

Would you be more comfortable with just that option being added? The filter seems a bit complicated, unless you are able to specify all modalias files.

thanks,

greg k-h

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They could also not create a rule to run modprobe, which looks cleaner to me and does not require any new code.

ciao,
Marco

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But you want modprobe to run when adding a new usb device, or pcmcia device, so that rule is necessary. Just not at boot time which causes the whole pci bus to be scanned, and stupid things like shpchp always to be loaded :(

thanks,

greg k-h

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Attached; I sent it to this list a while back as part of my "patches collection" mail.

The reason we use this is that we try and have an initramfs that works on every single machine, rather than produce a tailored one for the machine underneath.

So we take a little more care about what we coldplug and when -- rather than just probing for everything and hoping for the best.

Scott

Scott James Remnant
[email protected]

diff -ruNp udev-093~/udevtrigger.8 udev-093/udevtrigger.8
@@ -1,37 +1,100 @@
-.\" ** You probably do not want to edit this file directly **
-.\" It was generated using the DocBook XSL Stylesheets (version 1.69.1).
-.\" Instead of manually editing it, you probably should edit the DocBook XML
-.\" source for it and then use the DocBook XSL Stylesheets to regenerate it.
-.TH "UDEVTRIGGER" "8" "March 2006" "udev" "udevtrigger"
-.\" disable hyphenation
-.nh
-.\" disable justification (adjust text to left margin only)
-.ad l
-.SH "NAME"
+.\"Generated by db2man.xsl. Don't modify this, modify the source.
+.de Sh \" Subsection
+.br
+.if t .Sp
+.ne 5
+.PP
+\fB\\$1\fR
+.PP
+..
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Ip \" List item
+.br
+.ie \\n(.$>=3 .ne \\$3
+.el .ne 3
+.IP "\\$1" \\$2
+..
+.TH "UDEVTRIGGER" 8 "March 2006" "udev" "udevtrigger"
+.SH NAME
 udevtrigger \- request kernel devices events for coldplug
 .SH "SYNOPSIS"
+.ad l
+.hy 0
 .HP 12
-\fBudevtrigger\fR [\fB\-\-verbose\fR] [\fB\-\-dry\-run\fR]
+\fBudevtrigger\fR [\fB\-\-verbose\fR] [\fB\-\-dry\-run\fR] [\fB\-\-serial\fR] [\fBFILTER\&.\&.\&.\fR]
+.ad
+.hy
+
 .SH "DESCRIPTION"
+
 .PP
-Trigger kernel device uevents to replay missing events at system coldplug.
+Trigger kernel device uevents to replay missing events at system coldplug\&.
+
 .SH "OPTIONS"
+
 .TP
 \fB\-\-verbose\fR
-print out the devices found in sysfs.
+print out the devices found in sysfs\&.
+
 .TP
 \fB\-\-dry\-run\fR
-don't actually trigger the event.
+don't actually trigger the event\&.
+
+.TP
+\fB\-\-serial\fR
+run udevsettle between events\&.
+
+.SH "FILTER OPTIONS"
+
+.PP
+All options are accumulative and may be specified multiple times
+
+.TP
+\fB\-I\fIattr\fR=\fIvalue\fR\fR
+only those devices for which the given attribute matches the value (which may include wildcards) are triggered
+
+.TP
+\fB\-X\fIattr\fR=\fIvalue\fR\fR
+only those devices for which the given attribute DOES NOT MATCH the value (which may include wildcards) are triggered
+
+.TP
+\fB\-B\fIbus\fR\fR
+devices on the given bus are triggered
+
+.TP
+\fB\-C\fIclass\fR\fR
+devices in the given class are triggered
+
+.TP
+\fB\-F\fR
+devices that have previously failed are triggered
+
+.TP
+\fB\-b\fR
+block devices are triggered
+
+.TP
+\fB\-c\fR
+class devices are triggered
+
 .SH "ENVIRONMENT"
+
 .TP
 \fBUDEV_LOG\fR
-Overrides the syslog priority specified in the config file.
+Overrides the syslog priority specified in the config file\&.
+
 .SH "AUTHOR"
+
 .PP
-Written by Kay Sievers
-<[email protected]>
-and Hannes Reinecke
-<[email protected]>.
+Written by Kay Sievers <kay\&.sievers@vrfy\&.org> and Hannes Reinecke <hare@suse\&.de>\&.
+
 .SH "SEE ALSO"
+
 .PP
 \fBudev\fR(7)
+
+.SH AUTHOR
+Kay Sievers.

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Phooey - it was written by me :P

az just applied it to the portage tree :)

Roy Marples <[email protected]>
Gentoo/Linux Developer (baselayout, networking)

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We better avoid exposing kernel driver implementation details like 'bus', 'class', 'block', if we can. The current udev does not even have the old BUS= key in the man page, and everything is just SUBSYSTEM(S). That way, we are hopefully free to move things around in the kernel without breaking too much in userspace. Also 'block' may be a 'class', some day, and better not have its own option.

I've added these options to udevtrigger now:
--subsystem-match=<subsystem>
--subsystem-nomatch=<subsystem>
--attr-match=<file[=<value>]>
--attr-nomatch=<file[=<value>]>

If you only want to populate /dev, this should work fine:
udevtrigger --attr-match�v
It will also skip all class devices which don't have a corresponding device node.

You can also just skip all devices with a 'modalias' file:
udevtrigger --attr-nomatch modalias
Or just skip all devices with 'modalias' for pci:
udevtrigger --attr-nomatch modalias=pci*

By adding "--dry-run --verbose", you can check the filter on the command line. It's in the git tree now, care to try if that works for you?

Thanks,
Kay

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Very nice, I just tried this out and it works fine for me. Nice thing is, it sped up my boot time a bunch, as I don't have to wait on udevtrigger to finish setting up my usb bus (or that's why I'm guessing it's so much faster, haven't looked into it at all yet.)

thanks for doing this.

Oh, attached is the latest gentoo 50-rules.d file, if you want to update the udev tree with it (Gentoo now uses the persistant rules file from the udev package, so our rules file is a lot smaller now.)

thanks,

greg k-h

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Bleah, forgot it, sorry. Here it is...

# /etc/udev/rules/50-udev.rules: device naming rules for udev
#
# Gentoo specific rules
#
# There are a number of modifiers that are allowed to be used in some of the

# fields.  See the udev man page for a full description of them.
#
# Try not to modify this file, if you wish to change things, create a new rule
# file that can be run before this one.
#

# console
KERNEL=="pty[pqrstuvwxyzabcdef][0123456789abcdef]", NAME="%k", GROUP="tty",	OPTIONS="last_rule"
KERNEL=="tty[pqrstuvwxyzabcdef][0123456789abcdef]", NAME="%k", GROUP="tty",	OPTIONS="last_rule"
KERNEL=="vcs*",                 NAME="%k", GROUP="tty",			OPTIONS="last_rule"
KERNEL=="vcsa*",                NAME="%k", GROUP="tty",			OPTIONS="last_rule"
KERNEL=="tty",                  NAME="%k", GROUP="tty", MODE="0666",	OPTIONS="last_rule"
KERNEL=="tty[0-9]",             NAME="%k", GROUP="tty",			OPTIONS="last_rule"
KERNEL=="tty[0-9][0-9]",        NAME="%k", GROUP="tty",			OPTIONS="last_rule"
KERNEL=="console",		NAME="%k", GROUP="tty", MODE="0600"
KERNEL=="ptmx",			NAME="%k", GROUP="tty", MODE="0666"

# tty devices
KERNEL=="ttyS[0-9]*",	NAME="%k", SYMLINK="tts/%n", GROUP="tty"
KERNEL=="ttyUSB[0-9]*",	NAME="%k", SYMLINK="tts/USB%n", GROUP="tty", MODE="0660"
KERNEL=="ippp0",	NAME="%k", GROUP="tty"
KERNEL=="isdn*"		NAME="%k", GROUP="tty"
KERNEL=="dcbri*",	NAME="%k", GROUP="tty"
KERNEL=="ircomm*",	NAME="%k", GROUP="tty"

# all block devices
SUBSYSTEM=="block", GROUP="disk"

# cdrom symlinks and other good cdrom naming
BUS=="ide",	KERNEL=="hd[a-z]", ACTION=="add", IMPORT="cdrom_id --export $tempnode"
BUS=="scsi",	KERNEL=="sr[0-9]*", ACTION=="add", IMPORT="cdrom_id --export $tempnode"
BUS=="scsi",	KERNEL=="scd[a-z]", ACTION=="add", IMPORT="cdrom_id --export $tempnode"
BUS=="scsi",	KERNEL=="sg[0-9]*", ACTION=="add", DRIVERS=="sr", GROUP="cdrom"
ENV{ID_CDROM}=="?*",		PROGRAM="seq_node.sh %r %k cdrom", SYMLINK+="%c", GROUP="cdrom"
ENV{ID_CDROM_CD_RW}=="?*",	PROGRAM="seq_node.sh %r %k cdrw",  SYMLINK+="%c"
ENV{ID_CDROM_DVD}=="?*",	PROGRAM="seq_node.sh %r %k dvd",   SYMLINK+="%c"
ENV{ID_CDROM_DVD_R}=="?*",	PROGRAM="seq_node.sh %r %k dvdrw", SYMLINK+="%c"

# disk devices
KERNEL=="sd*",		NAME="%k", GROUP="disk"
KERNEL=="dasd*",	NAME="%k", GROUP="disk"
KERNEL=="ataraid*",	NAME="%k", GROUP="disk"

# compaq smart array
KERNEL=="cciss*",	NAME="%k"
KERNEL=="ida*",		NAME="%k"

# mylex
KERNEL=="rd*",		NAME="%k"

# dri devices
KERNEL=="card*",	NAME="dri/card%n", GROUP="video"
KERNEL=="nvidia*",	NAME="%k", GROUP="video"
KERNEL=="3dfx*",	NAME="%k", GROUP="video"

# alsa devices
SUBSYSTEM=="sound", GROUP="audio"
KERNEL=="controlC[0-9]*",	NAME="snd/%k"
KERNEL=="hw[CD0-9]*",		NAME="snd/%k"
KERNEL=="pcm[CD0-9cp]*",	NAME="snd/%k"
KERNEL=="midiC[D0-9]*",		NAME="snd/%k"
KERNEL=="timer",		NAME="snd/%k"
KERNEL=="seq",			NAME="snd/%k"

# capi devices
KERNEL=="capi",		NAME="capi20", SYMLINK+="isdn/capi20", GROUP="dialout"
KERNEL=="capi*",	NAME="capi/%n", GROUP="dialout"

# cpu devices
KERNEL=="cpu[0-9]*",	NAME="cpu/%n/cpuid"
KERNEL=="msr[0-9]*",	NAME="cpu/%n/msr"
KERNEL=="microcode",	NAME="cpu/microcode"

# dm devices (ignore them)
KERNEL=="dm-[0-9]*",	OPTIONS="ignore_device"
# create a symlink named after the device map name
# note devmap_name comes with extras/multipath
#KERNEL=="dm-[0-9]*",	PROGRAM="/sbin/devmap_name %M %m", NAME="%k", SYMLINK+="%c"
KERNEL=="device-mapper",	NAME="mapper/control"

# fb devices
KERNEL=="fb[0-9]*",	NAME="fb/%n", SYMLINK+="%k", GROUP="video"

# floppy devices
KERNEL=="fd[0-9]*",	NAME="floppy/%n", SYMLINK+="%k", GROUP="floppy"

# i2c devices
KERNEL=="i2c-[0-9]*",	NAME="i2c/%n", SYMLINK+="%k"

# input devices
KERNEL=="mice",		NAME="input/%k", MODE="0644"
KERNEL=="mouse*",	NAME="input/%k", MODE="0644"
KERNEL=="event*",	NAME="input/%k", MODE="0600"
KERNEL=="js*",		NAME="input/%k", MODE="664"
KERNEL=="ts*",		NAME="input/%k", MODE="0600"

# loop devices
KERNEL=="loop[0-9]*",	NAME="loop/%n", SYMLINK+="%k", GROUP="disk"

# md block devices
KERNEL=="md[0-9]*",	NAME="md/%n", SYMLINK+="%k", GROUP="disk"

# aoe char devices,
SUBSYSTEM=="aoe", KERNEL=="discover",	NAME="etherd/%k", GROUP="disk", MODE="0220"
SUBSYSTEM=="aoe", KERNEL=="err",	NAME="etherd/%k", GROUP="disk", MODE="0440"
SUBSYSTEM=="aoe", KERNEL=="interfaces",	NAME="etherd/%k", GROUP="disk", MODE="0220"

# misc devices
KERNEL=="agpgart",	NAME="misc/%k", SYMLINK+="%k"
KERNEL=="psaux",	NAME="misc/%k", SYMLINK+="%k"
KERNEL=="rtc",		NAME="misc/%k", SYMLINK+="%k", MODE="0664"
KERNEL=="uinput",	NAME="misc/%k", SYMLINK+="%k"
KERNEL=="inotify",	NAME="misc/%k", SYMLINK+="%k", MODE="0666"

# netlink devices
KERNEL=="route",	NAME="netlink/%k"
KERNEL=="skip",		NAME="netlink/%k"
KERNEL=="usersock",	NAME="netlink/%k"
KERNEL=="fwmonitor",	NAME="netlink/%k"
KERNEL=="tcpdiag",	NAME="netlink/%k"
KERNEL=="nflog",	NAME="netlink/%k"
KERNEL=="xfrm",		NAME="netlink/%k"
KERNEL=="arpd",		NAME="netlink/%k"
KERNEL=="route6",	NAME="netlink/%k"
KERNEL=="ip6_fw",	NAME="netlink/%k"
KERNEL=="dnrtmsg",	NAME="netlink/%k"
KERNEL=="tap*",		NAME="netlink/%k"

# network devices
KERNEL=="tun",		NAME="net/%k",	MODE="0600"

# ramdisk devices
KERNEL=="ram[0-9]*",	NAME="rd/%n", SYMLINK+="%k"

# IEEE1394 (firewire) devices (must be before raw devices below)
KERNEL=="raw1394", NAME="%k", GROUP="video"
KERNEL=="dv1394*", NAME="dv1394/%n", GROUP="video"
KERNEL=="video1394*", NAME="video1394/%n", GROUP="video"

# raw devices
KERNEL=="raw[0-9]*",	NAME="raw/%k", GROUP="disk"
KERNEL=="ram*",		NAME="%k", GROUP="disk"

# sound devices
KERNEL=="adsp",			NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="adsp[0-9]*",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="audio",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="audio[0-9]*",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="dsp",			NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="dsp[0-9]*",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="mixer",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="mixer[0-9]*",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="sequencer",		NAME="sound/%k", SYMLINK+="%k", GROUP="audio"
KERNEL=="sequencer[0-9]*",	NAME="sound/%k", SYMLINK+="%k", GROUP="audio"

# memory devices
KERNEL=="random",	NAME="%k", MODE="0666"
KERNEL=="urandom",	NAME="%k", MODE="0444"
KERNEL=="mem",		NAME="%k", MODE="0640"
KERNEL=="kmem",		NAME="%k", MODE="0640"
KERNEL=="port",		NAME="%k", MODE="0640"
KERNEL=="full",		NAME="%k", MODE="0666"
KERNEL=="null",		NAME="%k", MODE="0666"
KERNEL=="zero",		NAME="%k", MODE="0666"

# usb devices
KERNEL=="hiddev*",		NAME="usb/%k"
KERNEL=="auer*",		NAME="usb/%k"
KERNEL=="legousbtower*",	NAME="usb/%k", GROUP="usb"
KERNEL=="dabusb*",		NAME="usb/%k"
BUS=="usb", KERNEL=="lp[0-9]*",	NAME="usb/%k", GROUP="lp"

# v4l devices
KERNEL=="video[0-9]*",	NAME="v4l/video%n", SYMLINK+="video%n", GROUP="video"
KERNEL=="radio[0-9]*",	NAME="v4l/radio%n", SYMLINK+="radio%n", GROUP="video"
KERNEL=="vbi[0-9]*",	NAME="v4l/vbi%n", SYMLINK+="vbi%n", GROUP="video"
KERNEL=="vtx[0-9]*",	NAME="v4l/vtx%n", GROUP="video"

# dvb devices
SUBSYSTEM=="dvb", PROGRAM="/bin/sh -c 'K=%k; K=$${K#dvb}; printf dvb/adapter%%i/%%s $${K%%%%.*} $${K#*.}'", NAME="%c", GROUP="video"

# Asterisk Zaptel devices
KERNEL=="zapctl", NAME="zap/ctl"
KERNEL=="zaptimer", NAME="zap/timer"
KERNEL=="zapchannel", NAME="zap/channel"
KERNEL=="zappseudo", NAME="zap/pseudo"
KERNEL=="zap[0-9]*", NAME="zap/%n"

# pilot/palm devices
KERNEL=="pilot",	NAME="%k", GROUP="uucp"

# jaz devices
KERNEL=="jaz*",		NAME="%k", GROUP="disk"

# zip devices
KERNEL=="pocketzip*",	NAME="%k", GROUP="disk"
KERNEL=="zip*",		NAME="%k", GROUP="disk"

# ls120 devices
KERNEL=="ls120",	NAME="%k", GROUP="disk"

# lp devices
KERNEL=="lp*",		NAME="%k", GROUP="lp"
KERNEL=="irlpt",	NAME="%k", GROUP="lp"
KERNEL=="usblp",	NAME="%k", GROUP="lp"
KERNEL=="lp*",		NAME="%k", GROUP="lp"
KERNEL=="parport*",	NAME="%k", GROUP="lp"

# tape devices
KERNEL=="ht*",		NAME="%k", GROUP="tape"
KERNEL=="nht*",		NAME="%k", GROUP="tape"
KERNEL=="pt*",		NAME="%k", GROUP="tape"
KERNEL=="npt*",		NAME="%k", GROUP="tape"
KERNEL=="st*",		NAME="%k", GROUP="tape"
KERNEL=="nst*",		NAME="%k", GROUP="tape"
KERNEL=="osst*",	NAME="%k", GROUP="tape"
KERNEL=="nosst*",	NAME="%k", GROUP="tape"

# diskonkey devices
KERNEL=="diskonkey*",	NAME="%k", GROUP="disk"

# rem_ide devices
KERNEL=="microdrive*",	NAME="%k", GROUP="disk"

# kbd devices
KERNEL=="kbd",		NAME="%k", MODE="0664"

# Sony Vaio Jogdial sonypi device
KERNEL=="sonypi", NAME="%k", MODE="0666"

# packet devices
KERNEL=="pktcdvd",		NAME="pktcdvd/control", GROUP="cdrw", MODE="0660"
KERNEL=="pktcdvd[0-9]*",	NAME="pktcdvd/pktcdvd%n", GROUP="cdrw", MODE="0660"

# infiniband devices
KERNEL=="umad*",	NAME="infiniband/%k"
KERNEL=="issm*",	NAME="infiniband/%k"

# usbfs-like device nodes
SUBSYSTEM=="usb_device", PROGRAM="/bin/sh -c 'K=%k; K=$${K#usbdev}; printf bus/usb/%%03i/%%03i $${K%%%%.*} $${K#*.}'", NAME="%c", MODE="0644"

# Module autoloading

# Autoload modules that lack aliases but have them defined inutoload modules SYSFS{modalias}=="?*", ACTION=="add", RUN+="/sbin/modprobe $env{MODALIAS}"

# /etc/modprobe.conf.
SUBSYSTEM=="pnp", ENV{MODALIAS}!="?*", RUN+="/bin/sh -c 'while read id; do /sbin/modprobe pnp:d$$id; done < /sys$devpath/id'"
# If you have problems with some pnp modules being loaded, please enter the
# following aliases into the modprobe configuration files.  These are needed by
# udev to autoload some modules
# alias pnp:dPNP0510 irtty-sir
# alias pnp:dPNP0511 irtty-sir
# alias pnp:dPNP0700 floppy
# alias pnp:dPNP0800 pcspkr
# alias pnp:dPNP0b00 rtc
# alias pnp:dPNP0303 atkbd
# alias pnp:dPNP0f13 psmouse
# alias pnp:dPNPb02f analog

# Load firmware
SUBSYSTEM=="firmware", ACTION=="add", RUN+="firmware.sh"

# be backward compatible for a while with the /etc/dev.d and /etc/hotplug.d/ systems
# run /etc/hotplug.d/ stuff only if we came from a hotplug event, not for udevstart
ENV{UDEVD_EVENT}=="1", RUN+="udev_run_hotplugd $env{SUBSYSTEM}"

# always run /etc/dev.d/ stuff for now.
RUN+="udev_run_devd $env{SUBSYSTEM}"

# debugging monitor
RUN+="socket:/org/kernel/udev/monitor"

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