Previously, the action was only passed as the first command line
argument to the dispatcher scripts. Now, also set it via the
"$NM_DISPATCHER_ACTION" environment variable.
The main purpose is to have a particular, nm-dispatcher specific
variable that is always set inside the dispatcher scripts.
For example, imagine you have a script that can be either called by
dispatcher or some other means (manually, or spawned via
/etc/NetworkManager/dispatcher.d/11-dhclient). Then it might make
sense to differenciate from inside the script whether you are called
by nm-dispatcher. But previously, there was no specific environment
variable that was always set inside the dispatcher event. For example,
with the "hostname" action there are no other environment variables.
Now (with version 1.12), you can check for `test -n "$NM_DISPATCHER_ACTION"`.
(cherry picked from commit ce9619047c)
- don't use GSList as intermediate data type to construct
the environment, especially when all we want is to get
a strv array at the end. This reverts the order of elements
compared to previously.
- add and use helper methods _items_add_*() which assert against sensible
input.
- merge IPv4 and IPv6 implementations for creating the environment.
https://github.com/NetworkManager/NetworkManager/pull/112
Originally, the "callouts" directory contained various programs
that NetworkManager would call, for example the dhcp helper.
For a while, it only contains nm-dispatcher. Thus rename the directory
to indicate that it's for dispatcher.
