RE: Overlays configuration (Was: commit: ldap/ configure)

["Howard Chu" <hyc@highlandsun.com>]

> -----Original Message-----
> From: owner-openldap-devel@OpenLDAP.org
> [mailto:owner-openldap-devel@OpenLDAP.org]On Behalf Of Pierangelo Masarati

> I've thought a bit more on this; for each backend, I'd allow:
>
> user_no|no|auto|yes|mod|user_yes|user_mod
>
> but only advertize
>
> no|auto|yes|mod
>
> and only use no|yes as defaults
>
> with either no|auto|yes used as default.
> When the user picks any of no|yes|mod,
> the user_* from should be assigned to the
> configure var.
>
> - auto|yes|mod means specific backend build
>   is allowed not to take place if requirements
>   are not met without global build failure;
> - no|user_no means specific backend build
>   must not even be attempted
> - user_yes|user_mod means global build must
>   fail if specific backend requirements are
>   not met.
>
> --enable-backends should take the values
> no|yes|mod, where:
> - no means promote all yes to no
> - yes means promote all no to yes
> - mod means promote all yes|no to mod
>
> As a consequence, --enable-backends replaces
> backends' defaults with other legal default
> values, does not affect specific explicit
> backend enables and causes enabled backends to
> compile only if requirements are met.
>
> If there's no objection, I'd start coding this.

Hm, I need to think some more about this.

There are only two default states: no and yes, but not mod.
There are three user states: no, yes, and mod.
I think there are also two auto states: auto,yes and auto,mod. Currently none
of our backends default to an auto.

To me, using enable-backends=no means "turn all backends off" which of course
is senseless because then slapd cannot be built. You're treating it as "turn
all default-yes backends to user-no" which I guess is more useful, but less
intuitive.

Then, enable-backends=yes in light of this discussion would mean set all
default-no backends to auto,yes, and enable-backends=mod would mean turn all
default-yes and default-no backends to mod.

Does that follow?

  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support