[SSSD-users] lines beginning with spaces in sssd.conf

Simo Sorce simo at redhat.com
Fri Oct 11 12:57:57 UTC 2013


On Thu, 2013-10-10 at 19:38 -0400, Stephen Gallagher wrote:
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> On 10/10/2013 03:47 PM, Dmitri Pal wrote:
> > On 10/10/2013 02:42 PM, Stephen Gallagher wrote:
> >> On 10/10/2013 02:40 PM, Simo Sorce wrote:
> >>> On Thu, 2013-10-10 at 19:56 +0200, Jakub Hrozek wrote:
> >>>> On Thu, Oct 10, 2013 at 01:48:24PM -0400, Simo Sorce wrote:
> >>>>> On Thu, 2013-10-10 at 11:22 +0200, Jakub Hrozek wrote:
> >>>>>> On Thu, Oct 10, 2013 at 10:54:59AM +0200, Jakub Hrozek 
> >>>>>> wrote:
> >>>>>>> On Wed, Oct 09, 2013 at 02:03:00PM -0400, Stephen
> >>>>>>> Gallagher wrote:
> >>>>>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
> >>>>>>>> 
> >>>>>>>> On 10/09/2013 01:22 PM, Dmitri Pal wrote:
> >>>>>>>>> On 10/09/2013 01:05 PM, Ondrej Valousek wrote:
> >>>>>>>>>> Hi List,
> >>>>>>>>>> 
> >>>>>>>>>> I have noticed that since F19 I can not use
> >>>>>>>>>> lines beginning with spaces in sssd.conf - sssd
> >>>>>>>>>> complains otherwise. Was this an intentional
> >>>>>>>>>> change? I used spaces/white characters to ident
> >>>>>>>>>> the config for better readability. Thanks,
> >>>>>>>>>> 
> >>>>>>>>>> Ondrej
> >>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> _______________________________________________ 
> >>>>>>>>>> sssd-users mailing list 
> >>>>>>>>>> sssd-users at lists.fedorahosted.org 
> >>>>>>>>>> https://lists.fedorahosted.org/mailman/listinfo/sssd-users
> >>
> >>>>>>>>>> 
> >>>>>>> 
> >>>>>>>>>> 
> >> There was a change in the underlying libini_config library to
> >>>>>>>>> treat spaces as wrappers by default.
> >>>>>>>> 
> >>>>>>>> Just to clarify what this means: libini_config
> >>>>>>>> changed its behavior so that a leading space should
> >>>>>>>> be interpreted as a line-continuation from the
> >>>>>>>> previous line. So if you had REALLY long data (such
> >>>>>>>> as a complex ldap_search_filter), you could make it
> >>>>>>>> more readable by spreading it out on multiple lines.
> >>>>>>>> 
> >>>>>>>> 
> >>>>>>>>> It is probably a bug in the SSSD implementation of 
> >>>>>>>>> libini_config Hm... yes.
> >>>>>>>>> 
> >>>>>>>>> Line 225 in 
> >>>>>>>>> https://git.fedorahosted.org/cgit/sssd.git/tree/src/util/sss_ini.c
> >>
> >>>>>>>>> 
> >>>>>>> s/0/INI_PARSE_NOWRAP
> >>>>>>>>> 
> >>>>>>>>> You can definitely file a ticket for that.
> >>>>>>>>> 
> >>>>>>>> 
> >>>>>>>> Feel free to file a ticket, but I think the wrapping 
> >>>>>>>> behavior may prove more useful. Hard to say.
> >>>>>>> 
> >>>>>>> In general I agree that the wrapping functionality is 
> >>>>>>> useful, but I don't think we should be changing
> >>>>>>> behaviour to the point where SSSD doesn't start after
> >>>>>>> an upgrade.
> >>>>>>> 
> >>>>>>> I think we should do the change Dmitri proposed and
> >>>>>>> file another ticket to decide whether it makes sense to
> >>>>>>> munge existing configuration files with an upgrade
> >>>>>>> script and change to the line wrapping version.
> >>>>>> 
> >>>>>> I sent a patch to the list and filed 
> >>>>>> https://fedorahosted.org/sssd/ticket/2118
> >>>>> 
> >>>>> config files could be installed via management tools like 
> >>>>> puppet or cfengine.
> >>>>> 
> >>>>> I am personally completely against changing file format
> >>>>> (yes this is a change in file format) incompatibily. Please
> >>>>> use something like a \ char at the end of the line to
> >>>>> indicate continuation on the next line.
> >>>>> 
> >>>>> Simo.
> >>>> 
> >>>> There is a patch already on the list that reverts to the old 
> >>>> behaviour.
> >> 
> >>> Excellent however I was referring to the idea of "decide
> >>> whether it makes sense to munge existing configuration files
> >>> with an upgrade script and change to the line wrapping
> >>> version.". I think it does not.
> >> 
> >> 
> >> Yeah, I agree with that. Changing the file format is a bad idea.
> > 
> > 
> > First of all let me clarify some things:
> > 
> > * The change in the libini was discussed here on the list and
> > agreed to. * Also the fact that leading spaces are treated as
> > wrapper is the default behavior of the library was agreed to. * The
> > change to the ini library was requested and was actually proposed
> > to rely on leading spaced rather than "\" * My opinion as an
> > implementer was that "\" a better choice but I was talked out out
> > of it. * There is a ticket to allow wrapping by "\" but it is
> > deferred as there is no one asking for it * The fact that SSSD took
> > the defaults when switched to the new version is a bug and needs
> > fixing * Moving forward SSSD should stay backward compatible but
> > allow people to use wrapping if they want. This will be enabled via
> > SSSD startup command line arguments as noted in the ticket. Ticket
> > to do that is deferred till future.
> > 
> 
> Yes, agreed on all points. For the record, if I recall correctly we
> opted not to use the backslash mainly because we foresaw the
> possibility of actually using that character in option values and
> didn't want to have to deal with escaping it.

Still better than assuming a leading space means line continuation.
It is one of the most annoying conventions of ldif files and generally
totally unexpected by admins in .ini files which tend to be indented.

Simo.

-- 
Simo Sorce * Red Hat, Inc * New York



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