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examples: make nm-dispatcher script usable for networkd-dispatcher

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Historically there were plenty of callback based implementations around
ifupdown via /etc/network/if-up and similar. NetworkManager added the
dispatcher [1] feature for such a kind of functionality.

But so far a systemd-networkd (only) systemd had no means to handle those
cases. This is solved by networkd-dispatcher which is currently available
at least in ArchLinux and Ubuntu.
It takes away the responsibility to listen on netlink events in each
application and provides a more classic script-drop-in interface to respond
to networkd events [3].

This commit makes the NM example compatible to be used by NetworkManager
dispatcher as well as by networkd-dispatcher. That way we avoid too much
code duplication and can from now on handle special cases in the
beginning so that the tail can stay commonly used.

After discussion on IRC the current check differs by checking the
argument count (only in NetworkManager), if ever needed we could extend
that to check for known custom environment vars (NetworkManager =>
CONNECTION_UUID; networkd-dispatcher => OperationalState).

[1]: https://developer.gnome.org/NetworkManager/stable/NetworkManager.html
[2]: https://github.com/craftyguy/networkd-dispatcher
[3]: https://github.com/systemd/systemd/blob/master/src/systemd/sd-network.h#L86

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
This commit is contained in:
Christian Ehrhardt 2018-04-18 15:44:21 +02:00 committed by Miroslav Lichvar
parent bf7aa52394
commit 8cbc68f28f
1 changed files with 7 additions and 3 deletions
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10
examples/chrony.nm-dispatcher
View file

@ -1,10 +1,14 @@
#!/bin/sh
# This is a NetworkManager dispatcher script for chronyd to set its NTP sources
# online or offline when a network interface is configured or removed
# This is a NetworkManager dispatcher / networkd-dispatcher script for
# chronyd to set its NTP sources online or offline when a network interface
# is configured or removed
export LC_ALL=C
[ "$2" != "up" ] && [ "$2" != "down" ] && exit 0
# For NetworkManager consider only up/down events
[ $# -ge 2 ] && [ "$2" != "up" ] && [ "$2" != "down" ] && exit 0
# Note: for networkd-dispatcher routable.d ~= on and off.d ~= off
# Check if there is a default route