[systemd-devel] Launching a unit in response to a D-Bus signal

[Matthew Booth]

I have a requirement to restart squid whenever the VPN goes up or 
down[1]. Reading around, it seems that the way to do this would be in 
response to the relevant D-Bus signal, which seems to be this one:

signal sender=:1.6 -> dest=(null destination) serial=269 
path=/org/freedesktop/NetworkManager/ActiveConnection/2; 
interface=org.freedesktop.NetworkManager.VPN.Connection; 
member=VpnStateChanged

I expected that systemd would allow me to do this, but as far as I can 
tell it doesn't (I'm using F17). I can obviously write my own daemon to 
do this, but it seems to me that a daemon just for this would be a 
waste. I think this sounds like a good fit for systemd. Is it anything 
anybody's looked at?

Thanks,

Matt

[1] It's not directly relevant to this post, but the reason is that 
squid doesn't pick up the new nameservers until it's restarted.

P.S. I'm not subscribed.
-- 
Matthew Booth, RHCA, RHCSS
Red Hat Engineering, Virtualisation Team

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