[Rpm-maint] rpm --chroot and glibc/nscd

Panu Matilainen pmatilai at laiskiainen.org
Thu May 19 09:56:26 UTC 2011

On 05/17/2011 04:36 PM, Michael Schroeder wrote:
> On Tue, May 17, 2011 at 04:27:08PM +0300, Panu Matilainen wrote:
>> Did you try talking to glibc developers about this? Just asking so I
>> wont bother them again if they already told you to keep the pieces or
>> something to that effect...
> Not really. I was never successful when proposing something to
> Ulrich Drepper, so I didn't dare this time ;-)
> Also, I needed a fix for the old SUSE versions, so it didn't make
> much sense to ask for some new functionality.
> But I agree that support in glibc would be much better than this
> hack. Note that you have to both delete the ncsd connection and
> flush the nss setup.

Hmm, background research (trying to avoid my head getting severed for 
asking dumb questions ;) turned up this in glibc's nss.h:

/* Overwrite service selection for database DBNAME using specification
    in STRING.
    This function should only be used by system programs which have to
    work around non-existing services (e.e., while booting).
    Attention: Using this function repeatedly will slowly eat up the
    whole memory since previous selection data cannot be freed.  */
extern int __nss_configure_lookup (__const char *__dbname,
                                    __const char *__string) __THROW;

That looks fairly promising, and it should bypass nscd too at least in 
newest glibc versions:

	- Panu -

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