The script is run for every dispatcher event. Most of the events are not
actually relevant, and we just need to determine that there is nothing
to do and quit.
Avoid calling "dirname" and "basename".
The supported ifcfg-file has a very specific form. We can just check
(and parse) it in one got regular expression in bash.
A shell script is executed line-by-line. Note that for most dispatcher
events, "10-ifcfg-rh-routes.sh" has nothing to do and will just quit.
Move those checks earlier, to avoid bash executing the code that won't
be needed most of the time.
Don't call the 'if{up,down}-routes' scripts because in next Fedora
versions network scripts will be deprecated and will not be present in
the default installation.
Instead, just copy and adapt the code from those scripts.
https://bugzilla.redhat.com/show_bug.cgi?id=1618419
The main reason to introduce the "no-wait.d" dispatcher directory was
"10-ifcfg-rh-routes.sh", which (as a pre-up script) delays activation.
We even extracted the script to a separate package on RHEL to avoid
delays by default.
Invoke the script via no-wait.d.
If a connection has an associated "rule-NAME" or "rule6-NAME" file,
don't try to read in the routes, since NetworkManager won't be able to
parse them correctly. Instead, log a warning that they will need to be
applied via a dispatcher script, and provide a script that would do
that in examples/dispatcher/.
