dinit/TODO

For version 1.0 (release requirements):
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* Be able to boot and shutdown Linux and FreeBSD (or OpenBSD).
* Documentation must be complete (mostly done; will need updates as other items are completed).
* [DONE] dinitcheck should be able to resolve variable substitutions using variables from running dinit.


For later (post 1.0):
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* jails support
* Proper support for socket activation?
* Perhaps need a way to prevent script services from re-starting.
  (eg there's no need to mount filesystems twice; there might be various other
   system initialisations that can't or shouldn't really be "undone" and so do
   not need to be re-done).
* on shutdown, after a long interval with no activity, display information about
  services we are waiting on (and/or, do this when prompted via ^C or C-A-D?)
* Internationalisation
* A service can prevent shutdown/reboot by failing to stop. Maybe make
  multiple CTRL-ALT-DEL presses (or ^C since that's more portable) commence
  immediate shutdown (or launch a simple control interface).
* When we take down a service or tty session, it would be ideal if we could kill
  the whole process tree, not just the leader process (need cgroups or pid
  namespace or other mechanism).
* Allow running services chroot, in namespaces (pid/fs/uid), etc
* Support chaining service output to another process (logger) input; if the
  service dies the file descriptor of its stdout isn't closed and is reassigned
  when the service is restarted, so that minimal output is lost. [Done!]
  - even more, it would be nice if a single logger process could be responsible
    for receiving output from multiple services. This would require some kind of
    protocol for passing new output descriptors to the logger (for when a
    service starts).


Even later / Maybe never:
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* Support recognising /etc/init.d services automatically (as script services, with
  no dependency management - or upstart compatible dependency management)
  Also BSD's rc.d style scripts (PROVIDE, REQUIRE).
* Place some reasonable, soft limit on the number of services to be started
  simultaneously, to prevent thrashing. Services that are taking a long time
  to start don't count to the limit. Maybe use CPU/IO usage as a controlling
  factor.
* Cron-like tasks (if started, they run a sub-task periodically. Stopping the
  task will wait until the sub-task is complete). 
* Allow to run services attached to virtual tty, allow connection to that tty (ala "screen").
* SystemD-like handling of filesystem mounts (see autofs documentation in kernel)
  i.e. a mount point gets an autofs attached, and lazily gets mounted when accessed
  (or is mounted in parallel). Probably put the functionality in a separate daemon.