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Re: [Cooker] strange problem with "hotplug" package
From: |
Andrey Borzenkov |
Subject: |
Re: [Cooker] strange problem with "hotplug" package |
Date: |
Tue, 06 May 2003 17:45:40 +0400 |
> my situation below:
> when i unplug my usb NIC and plug it back,
> i found "ifplugd" running at my system.
> and i have "MII_NOT_SUPPORTED=yes" at ifcfg-eth0,
> so this souldn't be happened.
> i trace the script /etc/hotplug/net.agent and
> found that the "grep" command didn't work as expected.
>
> i shrink the net.agent script as below:
>
> #!/bin/bash
> grep -q '^MII_NOT_SUPPORTED' /etc/sysconfig/network-scripts/ifcfg-eth0
> echo $? > /tmp/grep_result
>
> /tmp/grep_result is "0" when run script from command-line.(correct result)
> /tmp/grep_result is "1" when i plug-in my usb NIC. (wrong result!!)
>
> i found if i add ">/dev/null" would solve the strange problem.
> eg: fix first line to:
> grep -q '^MII_NOT_SUPPORTED' /etc/sysconfig/network-scripts/ifcfg-eth0
> >/dev/null
> now /tmp/result would be "0" if i plug-in my usb NIC.
> after fix the original net.agent, add ">/dev/null" to grep,
> i solve my problem, ifplugd woun't start when i plug-in my usb NIC.
> i found there are many "grep" at /etc/hotplug/* scripts.
> maybe all these "grep" would suffer as mine.
> i m curious what casue "grep" stop working without ">/dev/null".
> anybody who can tell me ??
address@hidden grep -q bor /etc/passwd <&- >&-
grep: write error: Bad file descriptor
address@hidden echo $?
1
exec_usermodehelper closes all file descriptors so grep barfs.
Adding > /dev/null makes a valid stdout.
This is om Mandrake 9.0; you say it is on 9.1 ... well, this
definitely makes hotplug life harder.
i wonder why grep would write to stdout with -q:
-q, --quiet, --silent
Quiet; do not write anything to standard output. Exit immedi-
ately with zero status if any match is found, even if an error
was detected. Also see the -s or --no-messages option.
address@hidden uname -a
Linux cooker.mow.siemens.ru 2.4.20-2mdk #1 Mon Dec 9 15:07:53 CET 2002 i686
unknown unknown GNU/Linux
address@hidden rpm -q hotplug grep
hotplug-2002_04_01-2mdk
grep-2.5-5mdk
-andrey
- Re: [Cooker] strange problem with "hotplug" package,
Andrey Borzenkov <=
- Re: [Cooker] strange problem with "hotplug" package, Stepan Kasal, 2003/05/06
- Re: [Cooker] strange problem with "hotplug" package, Jim Meyering, 2003/05/06
- Iconsistent ls sorting with and without `v', Andrey Borzenkov, 2003/05/09
- Re: Iconsistent ls sorting with and without `v', Jim Meyering, 2003/05/10
- Re: Iconsistent ls sorting with and without `v', Andrey Borzenkov, 2003/05/10
- Re: Iconsistent ls sorting with and without `v', Stepan Kasal, 2003/05/11
- Re: Iconsistent ls sorting with and without `v', Thierry Vignaud, 2003/05/22