From mboxrd@z Thu Jan  1 00:00:00 1970
From: Roman Kagan <rkagan@mail.ru>
Date: Wed, 16 Feb 2005 10:51:17 +0000
Subject: Re: [ANNOUNCE] hotplug-ng 001 release
Message-Id: <20050216105117.GB2360@katya>
List-Id: <linux-hotplug.vger.kernel.org>
References: <20050211004033.GA26624@suse.de>
In-Reply-To: <20050211004033.GA26624@suse.de>
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To: linux-hotplug@vger.kernel.org

On Mon, Feb 14, 2005 at 02:42:08PM -0800, Greg KH wrote:
> You are completly correct, I love your kernel patch.

I'm glad you like it.  In case you're interested, I'll send a patch for
the SCSI case in the followup mail.

Meanwhile let me speculate a bit about another potential use of this
envirnonment variable.  E.g. here's a slightly modified /sbin/hotplug
from hotplug-2004_09_23:

DIR="/etc/hotplug.d"
DEVDIR="${DIR}/$1/${MODNAME#*:}"

for I in "${DIR}/$1/"* "${DIR}/"default/*.hotplug ; do
	if [ -f "$I" ]; then
		case "$I" in
		  *.hotplug)
			[ -x "$I" ] && "$I" $1
			;;
		esac
	elif [ -d "$I" ]; then
		case "$DEVDIR" in
		  $I)
			for J in "$I"/*.hotplug; do
				[ -f "$J" -a  -x "$J" ] && "$J" $1
			done
			;;
		esac
	fi
done

exit 1

It extends the hotplug multiplexor to dispatch the hotplug scripts in
the hotplug.d/bus directory and its subdirectories matching the $MODNAME
(with the bus: prefix stripped).

The subdirectory names would be shell patterns themselves.  (This might
be somewhat counterintuitive because normally you want all names that
match a pattern, but here you want all patterns (at the same time
directory names) that match the $MODNAME.)  E.g. if someone wants a
hotplug script to be run only for USB devices with vendor ID 0x1234 and
product ID 0xABCD he would put his script under
/etc/hotplug.d/usb/v1234bABCD\*/.

This way it can replace that *map thing without the need to start
_every_ hotplug script just to see most of them exit without doing
anything because they don't match the device.

The script above works even with ash from klibc-0.198; it should be
fairly easy to implement the same model in the binary hotplug, provided
fnmatch is added to klibc.

BTW this will probably render "MODNAME" inappropriate; DEVALIAS or
something like that would be better.

Cheers,
  Roman.


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