cc3803f207
for cables being plugged in or unplugged. When this occurs, the dhclient service is restarted to automatically obtain a new IP address. This is useful for roaming users (laptops). svn path=/nixos/trunk/; revision=9124
50 lines
1.1 KiB
Nix
50 lines
1.1 KiB
Nix
{dhcp, nettools, interfaces, lib}:
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let
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# Don't start dhclient on explicitly configured interfaces.
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ignoredInterfaces = ["lo"] ++
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map (i: i.name) (lib.filter (i: i ? ipAddress) interfaces);
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stateDir = "/var/lib/dhcp"; # Don't use /var/state/dhcp; not FHS-compliant.
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in
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{
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name = "dhclient";
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extraPath = [dhcp];
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job = "
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description \"DHCP client\"
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start on network-interfaces/started
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stop on network-interfaces/stop
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env PATH_DHCLIENT_SCRIPT=${dhcp}/sbin/dhclient-script
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script
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export PATH=${nettools}/sbin:$PATH
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# Determine the interface on which to start dhclient.
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interfaces=
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for i in $(cd /sys/class/net && ls -d *); do
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if ! for j in ${toString ignoredInterfaces}; do echo $j; done | grep -F -x -q \"$i\"; then
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echo \"Running dhclient on $i\"
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interfaces=\"$interfaces $i\"
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fi
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done
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if test -z \"$interfaces\"; then
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echo 'No interfaces on which to start dhclient!'
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exit 1
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fi
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mkdir -m 755 -p ${stateDir}
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exec ${dhcp}/sbin/dhclient -d $interfaces -e \"PATH=$PATH\" -lf ${stateDir}/dhclient.leases
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end script
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";
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}
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