When evolving to a new generation fails, users will typically abandon
it (so that a new attempt can be made). However, the generated
scripts and the logged output is very valuable from a debugging
perspective.
Therefore, keep the data around by just renaming the generation
directory.
Later, we can include these directories in the garbage collecting
process, if we want to.
A generic replacement for src/net with some advantages:
- Shell script is well-suited to these kinds of tasks, making this
implementation much simpler.
- Allow arbitrary number of actions (not just init/exit), this can be
used to implement things like `dagger exec up/down`.
- Allow arbitrary number of scripts for each action/node tuple. This
will let us handle more complex scenarios in confd without having to
fiddle about with src/net.
Tobias Waldekranz