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Subject: Re: [PATCH]: gnu: Add guile-dbi.
Date: Tue, 21 Jun 2016 23:09:05 +0800
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: guix-devel@gnu.org

ludo@gnu.org (Ludovic Court=C3=A8s) writes:

> Hi!
>
> Maurizio Boriani <baux@gnu.org> skribis:
>
>>   I'm the maintainer and first author of guile-dbi
>
> Good to see you here!  :-)
>
Oh, nice!

>>     >> Unfortunately, Guile DBI loads its backends using `dlopen', so I
>>     >> have to set 'LD_LIBRARY_PATH' to '$guile-dbd-sqlite/lib' for
>>     >> loading it.
>>
>>     Ludovic> I don=E2=80=99t have any great ideas.
>>
>>     Ludovic> If it uses lt_dlopen, then we should recommend setting
>>     Ludovic> LTDL_LIBRARY_PATH instead of LD_LIBRARY_PATH, which is a
>>     Ludovic> lesser evil.
>>
>>     Ludovic> Otherwise, we could also hard-code the file name of, say,
>>     Ludovic> guile-dbd-sqlite in guile-dbi, such that there=E2=80=99s al=
ways at
>>     Ludovic> least one backend available.
>>
>> may be ok for you if I introduce and 'hardcoded' default search path
>> for library lookup in guile-dbi source code and do a new release?=20
>
> I don=E2=80=99t think there=E2=80=99s any good default search path that w=
e could hard
> code, though, except arbitrarily choosing one of the backends as I
> suggested above.
>
> Ideas?
I think it will be great to introduce a new search path (eg: GUILE_DBD_PATH)
in addition to LD_LIBRARY_PATH.  Find the absolute so filepath in it
ourself, then pass to dlopen.=20=20


Another idea is changing dbd libraries to scheme modules.  Then dbi will
use the '(dbi dbd mysql)' module, the module may use 'load-extension'.
So we can patch the scheme file of each dbd module.