The ifcfg-rh plugin is now deprecated and in bugfixes-only mode. When
users try to set a property that is not supported by the plugin, we
need to report an error.
Add an helper function to set such error. Also, introduce a new error
code so that the situation can be detected and dealt with
programmatically.
We want to guard against concurrent modifications of profiles. We cannot
lock profiles, so what we instead do is expose (and bump) a version ID.
The user can check the version ID, plan ahead what to do, and tell
NetworkManager to only make the modification if no concurrent
modification was done. The conflict can be detected via the version ID.
The Update2() D-Bus call gets a parameter to only allow the request if
the version ID still matches.
nmcli should use this, but it is quite some effort to retry upon
concurrent modification. This is still to do.
Note that the user might make a decision that is based on multiple
profiles. As the new version-id is only per-profile, we cannot guard
against such inter-profile modifications. What would be needed, is a
UpdateMany() call, where we could modify multiple profiles at once, and
the action only takes effect if all version IDs show no concurrent
modification. That's not done yet, and maybe never will be.
"libnm-core/" is rather complicated. It provides a static library that
is linked into libnm.so and NetworkManager. It also contains public
headers (like "nm-setting.h") which are part of public libnm API.
Then we have helper libraries ("libnm-core/nm-libnm-core-*/") which
only rely on public API of libnm-core, but are themself static
libraries that can be used by anybody who uses libnm-core. And
"libnm-core/nm-libnm-core-intern" is used by libnm-core itself.
Move "libnm-core/" to "src/". But also split it in different
directories so that they have a clearer purpose.
The goal is to have a flat directory hierarchy. The "src/libnm-core*/"
directories correspond to the different modules (static libraries and set
of headers that we have). We have different kinds of such modules because
of how we combine various code together. The directory layout now reflects
this.
