Re: [greenstone-devel] configuration problem

From Richard Managh
DateTue, 10 Jan 2006 10:05:36 +1300
Subject Re: [greenstone-devel] configuration problem
In-Reply-To (43C2B072-4040804-bellsouth-net)
Hi Rich,

Hardware determines the endian differences.

If you are running on Intel/AMD hardware, its little endian, if you are
running on Sun Sparc, or Mac (Power PC) hardware, that will be big
endian. Check Google for more details.

Hope this helps,


Richard.
--
DL Consulting
Greenstone Digital Library and Digitisation Specialists
contact@dlconsulting.co.nz
www.dlconsulting.co.nz


Beth Nicol wrote: Rich:

Depends on the Unix - Mac matches up with Solaris; the others (on intel
type machines) don''t match... and for that matter, I had a problem with
FreeBSD not quite matching either.

Maybe someone knows: is it OS or the hardware platform that has the
endian differences?


Rich Robinson wrote:

> Just for my clarification, I'm actually building on Mac OSX and
> transferring to a UNIX box to be served. Windows no longer enters
> into the equation. Before I go through using the db2txt and txt2db
> utilites, does anyone know if Unix and Mac OSX are different endians?
>
> Rich
>
>> Hi
>>
>> Just to add to what Richard wrote, for MGPP collections you only need to
>> rebuild the gdbm database. But for MG collections, a bug only recently
>> discovered (and fixed after the release of 2.62) means that you need to
>> rebuild the whole collection when transferring to a different endian
>> machine.
>>
>> Regards,
>> Katherine
>>
>> Richard Managh wrote:
>>
>>> Hi Rich,
>>>
>>> Just to add to what Stephen wrote,
>>>
>>> When you upload the collection to your mac, the only part of the
>>> collection that is affected by the endian problem is the gdbm
>>> database.
>>> The mg indexes in the collection and the associated files will be
>>> fine.
>>> A quick way of dealing with the gdbm database is to use two utilities
>>> provided with greenstone, db2txt and txt2db
>>>
>>> db2txt - converts the gdbm database for a collection from binary
>>> form to
>>> text form
>>> txt2db - converts the gdbm database for a collection from text form
>>> back
>>> to binary form
>>>
>>> You can find the gdbm database for a collection in that collections
>>> index/text directory.
>>> It will be named as a *.ldb file, or a *.bdb file, the l stands for
>>> little endian, the b stands for big endian. So on a windows
>>> machine, if
>>> you had a built collection with the name "apples", you would find a
>>> apples.ldb file here: gsdlcollectapplesindex extapples.ldb
>>>
>>> So, to successfully transfer your gdbm database from a windows machine
>>> to a mac, you would need to use the db2txt utility on the windows
>>> machine, to convert the *.ldb file to a text form, something like this
>>>
>>> db2txt apples.ldb > apples.ldb.txt
>>>
>>> Once you have uploaded that ldb file to the mac, you can use the mac's
>>> version of txt2db to convert your text version back to a *.bdb file in
>>> this case, something like
>>>
>>> txt2db apples.ldb.txt > apples.bdb
>>>
>>> Put this file in the index/text directory, and your collection should
>>
>>
>> > work properly on the mac.
>> >
>> > Hope this helps,
>> >
>> >
>> > Richard
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>