On Sat, 28.09.13 00:22, Paul D. DeRocco ([email protected]) wrote:
> I'm working with a Gumstix, and I want to run an "ifup" command when the
> WiFi device becomes available. I'm not sure why, but it always seems to
> become available after the boot process is complete, so I can't use a
> regular service unit tied to something like multi-user.target. So I'm
> trying to have a udev rule launch a service instead. My first guess is
> this:
>
> /etc/udev/rules.d/wlan0-ifup.rules:
>
> SUBSYSTEM=="net", KERNEL=="wlan0", \
> ENV{SYSTEMD_WANTS}+="wlan0-ifup.service"
>
> /etc/systemd/system/wlan0-ifup.service:
>
> [Unit]
> Description=Bring wlan0 up
> DefaultDependencies=false
>
> [Service]
> ExecStart=/sbin/ifup wlan0
Matching to wlan sounds like a poor choice, as on modern systems that's
not how interfaces are named. Also, even on old systems there's no
guarantee that wlan is how things are named.
>
> Naturally, the service never runs, so it doesn't work. After logging in, I
> can manually start the service, and the WiFi connects, so the problem has
> to be in my udev rule. I ask here, because this seems more
> systemd-specific than udev-specific.
>
> There's also a rule in 99-systemd.rules:
>
> SUBSYSTEM=="net", KERNEL!="lo", TAG+="systemd", \
> ENV{SYSTEMD_ALIAS}+="/sys/subsystem/net/devices/$name"
>
> I suspect that there's a way to hook something to that, but I can't figure
> out how.
>
> So what's the right way to do this? Is there a man page specifically for
> this situation?
Something like this should work:
SUBSYSTEM=="net", DEVTYPE=="wlan", ENV{SYSTEMD_WANTS}+="ifup@$name.service"
or so. This will instantiate one instance of [email protected] per wlan
interface found. (Note however that the DEVTYPE match only works for
clean network drivers which do not implement their own wlan stack, and
which advertise themselves properly).
Lennart
--
Lennart Poettering - Red Hat, Inc.
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