Le 18/12/2017 à 09:01, Dr. Nikolaus Klepp a écrit :
Apply this patch to /lib/udev/ifupdown-hotplug-original. It changes line 78 from
exec ifup --allow=hotplug $INTERFACE
to
if [ -z "${INTERFACE##eth[0-9]*}" ]; then
if [ $(cat /sys/class/net/$INTERFACE/carrier) -eq 1 ]; then
exec ifup --allow=hotplug $INTERFACE
fi
else
exec ifup --allow=hotplug $INTERFACE
fi
Which hopefully brings up eth[0-9]* if the cable is plugged in. Most likely it would be a speed
improvement if the lines "exec ifup --allow=hotplug $INTERFACE" are changed to "exec
ifup --allow=hotplug $INTERFACE &", but this works for me. It won't work if your eth is not
called eth[0-9]* :-)
Nik
Just saw a typo in my mail: the file is "/lib/udev/ifupdown-hotplug" (not
"/lib/udev/ifupdown-hotplug-original").
Now it launches dhclient on eth0 right away, which incurs some
delay before it goes to background. Shorther than before, but still a delay.
Didier
I think you tried the version without "&" at the end of "exec ifup --allow=hotplug $INTERFACE". Could you please edit
the two lines (80 and 83) in "/lib/udev/ifupdown-hotplug" so that they say "exec ifup --allow=hotplug $INTERFACE &" -
i.e. add the "&" at the end and try again?
I fact, my situation wasn't the same as the one you reported in the
first place. The message on the console was the following:
Configure network interfaces...ifup: waiting for lock on
/run/network/ifstate.eth0
This has now disapeared and I am dealing with waiting on DHCP for
an interface without any cable plugged in.
I wondered if there was an interplay with ifplugd there.
I tried disabling all interfaces in ifplugd and the result was the
same.
Then I introduced some debug prints in ifupdown-hotplug to debug
the logic:
...
printf 'ifupdown-hotplug invoked for interface %s\n' "$INTERFACE"
>/run/$INTERFACE.log;
if [ -z "${INTERFACE##eth[0-9]*}" ]; then
if [ $(cat /sys/class/net/$INTERFACE/carrier) -eq 1 ]; then
printf 'Carrier detected; setting up.\n' >>/run/$INTERFACE.log
exec ifup --allow=hotplug $INTERFACE &
else
printf 'No carrier; do not set up.\n' >>/run/$INTERFACE.log;
fi
else
printf 'Not an ethernet interface; setting up.\n'
>>/run/$INTERFACE.log;
exec ifup --allow=hotplug $INTERFACE &
fi
...
The result is as expected:
$ cat /run/eth0.log
ifupdown-hotplug invoked for interface eth0
No carrier; do not set up.
DHCPDISCOVER is probably launched by the caller of
ifupdown-hotplug. I tried to exit with return-code 1 in case the carrier
isn't detected, but this has no effect.
Didier
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