Have a look at
/etc/dhcp/dhclient-exit-hooks. The only thing is, when I tried
using it in a very basic way, it triggered every time
the lease was renewed. There may be options only to trigger on
IP change. I stopped looking at that point as my "dynamic IP" is
virtually static and has not changed in over a year now.
I had similar issues with dhclient hooks for my Philips Hue lights
:)
When I'm coming home, and my phone joins the wifi, and it is dark
and
the lights are off, turn on the lights. However, that also
resulted in
the lights turning on in the middle of night on a DHCP lease
renewal.
I've just had a look at man
dhclient-script and part of it says:
Operation
When dhclient needs to invoke the client configuration script, it
defines a set of variables in
the environment, and then invokes /sbin/dhclient-script.
In all cases, $reason is set to the name of the reason why the
script has been invoked. The
following reasons are currently defined: MEDIUM, PREINIT, BOUND,
RENEW, REBIND, REBOOT, EXPIRE, FAIL, STOP, RELEASE, NBI and
TIMEOUT.
so perhaps intelligent querying of $reason may yield results
Nick
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