Re: Management of opendocument (openoffice.org) files in git

From: Avery Pennarun <apenwarr@gmail.com>
Date: Sep 16, 2008, 16:04 UTC
Message-ID: <32541b130809160904v7acc73cfm4856c33d40555e94@mail.gmail.com>
In-Reply-To: <48CF630F.4090808@gmail.com>

On Tue, Sep 16, 2008 at 3:41 AM, Sergio Callegari <sergio.callegari@gmail.com> wrote:

Show 12 quoted lines

> 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