separating persistent and ephemeral state (in lockdir)

[Stefan (metze) Metzmacher]

> Samba currently defaults to storing all of its state into lockdir.
> I don't think that this is optimal, because it means that
> "persistant" state (e.g, winbindd_idmap.tdb) is kept in the same
> location as "ephemeral" state (e.g, locking.tdb).
>
> This is a problem because some systems (e.g, embedded) want to
> keep persistent state in a separate location to where run-time
> state is stored, since the latter may be on a file-system that's
> (re-)initialized at boot.
>
> The author of the "fhs.patch" in packaging/Debian/** seems to
> agree with this sentiment.  Based on that patch and my own changes,
> here's a quick analysis of the category of each file that's
> accessed via lock_path():
>
>   lock_path() (e.g, /var/run/samba)
> 	brlock.tdb
> 	connections.tdb
> 	locking.tdb
> 	messages.tdb
> 	namelist.debug
> 	sessionid.tdb
> 	sessionid.tdb
> 	unexpected.tdb
> 	winbindd_privileged/
>
>   state_path() (e.g, /etc/samba/private)
> 	account_policy.tdb
> 	browse.dat
> 	group_mapping.tdb
> 	lang_<LANG>.tdb
> 	ntdrivers.tdb
> 	ntforms.tdb
> 	ntprinters.tdb
> 	privilege.tdb
> 	registry.tdb
> 	share_info.tdb
> 	winbindd_idmap.tdb
> 	wins.dat
> 	wins.tdb
>
>   cache_path() (Debian separates this from lock_path() for some reason)
> 	netsamlogon_cache.tdb
> 	printing.tdb
> 	printing/<PRINTERNAME>.tdb
> 	winbindd_cache.tdb
>

Hi Luke,

I didn't know about this patch yet, but I think this is a good idea, and
I'll integrate that for samba4 if no one doesn't like it.
tridge: do you agree?

jerry,jra,vl,gd: for samba3 this would also make sense, but maybe with
	         all tree defaulting to the current lock_dir() to not
                 break installations




--
metze

Stefan Metzmacher <metze at samba dot org>