Removing sourcing of network link files from the udev-rules module.
What always should be included should be placed in the systemd-network
module and other modules that provide/require spesific link files
should add them, themselves via their relevant include section.
This commit changes how NM is started inside the initrd. Instead of running NM
in the special --configure-and-quit=initrd mode, which sets up network and
quits, start it as a daemon.
This has multiple advantages. First, we no longer need to run NM in a special
mode that requires additional code and maintenance. NetworkManager works
exactly as in the real root.
One problem of the current configure-and-quit approach is that once NM has
quit, dynamic addresses can expire if the initrd setup takes longer than the
DHCP lease interval or than the IPv6 address lifetime. Running NM as a service
solves this problem.
Now NM runs with D-Bus support and therefore its API can be used by other
modules. This open the possibility, for example, to integrate nm-cloud-setup to
automatically configure networking based on cloud metadata.
Use the NetworkManager-wait-online.service, ordered before
dracut-initqueue.service, to delay the initqueue until NM has terminated its
configuration.
In the current state, services that depend on network need to
use dracut hooks, since nothing with pull in the network
targets into the transaction.
In the future, it would be nice to provide developers on systemd-only
systems the possibility to not use dracut hooks at all, but simply put
normal systemd services into the initrd.
Also, some modules even right now depend on systemd ordering, like
cryptsetup, so let's make sure, that the ordering inside systemd work
properly as well.
With dracutsysrootdir set and foreign binaries in sysroot,
running NetworkManager --version is not possible and it may be
different than the one installed on the host.
NM_VERSION can be used to override it.
Signed-off-by: Zoltán Böszörményi <zboszor@pr.hu>
Install libnss_dns.so and libnss_mdns4_minimal.so plugins for the Name
Service Switch (NSS) functionality of glibc so that name resolution
through /etc/resolv.conf and mDNS works in the initrd.
Fixes: #772
Harald Hoyer