From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Avery Pennarun" <apenwarr@gmail.com>
Subject: Re: Management of opendocument (openoffice.org) files in git
Date: Tue, 16 Sep 2008 12:04:44 -0400
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Cc: "Johannes Sixt" <j.sixt@viscovery.net>, git@vger.kernel.org
To: "Sergio Callegari" <sergio.callegari@gmail.com>
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On Tue, Sep 16, 2008 at 3:41 AM, Sergio Callegari
<sergio.callegari@gmail.com> wrote:
> Johannes Sixt wrote:
>>
>> You don't need a temporay zip filename in filter mode:
>>
>>  unzip $UNZIP_OPTS /dev/stdin  # works for me, but not 100% portable
>>  zip $ZIP_OPTS - .             # writes to stdout
>>
>>
>
> The unzip documentation says "Archives read from standard input are not yet
> supported", so I was a bit worried about using the /dev/stdin thing.  Might
> it be that there are subtle cases where unzip needs to seek or rewind?

IIRC zip files keep their index at the end of the file, which means
zipping in a pipeline is efficient (you can write all the blocks
first, then drop the final index at the end) but unzipping that way is
really hard.

unzipping from /dev/stdin seems to work if stdin is seekable, otherwise not.

       unzip /dev/stdin <filename.zip    # works
       cat filename.zip | unzip /dev/stdin    # doesn't work

Have fun,

Avery