Re: Creating Compressed Loop FS from stdin

From: Maxim Sobolev (sobomax_at_portaone.com)
Date: 12/30/04

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    Date: Thu, 30 Dec 2004 17:08:10 +0200
To: Peter Pentchev <roam@ringlet.net>

    Never mind - people are inheretedly error prone creatures. ;-)

    In your case shell has been passing file descriptor of the open file,
    not pipe, so that seeking has been working properly.

    Anyway, I think that your patch is useful, since it should allow using
    disk devices.

    -Maxim

    Peter Pentchev wrote:
    > On Thu, Dec 30, 2004 at 04:55:43PM +0200, Peter Pentchev wrote:
    >
    >>On Thu, Dec 30, 2004 at 04:20:16PM +0200, Maxim Sobolev wrote:
    >>
    >>>You don't check return code of the second lseek - I bet it fails. This
    >>>probably leads to creation of seemingly valid loop fs (i.e. with valid
    >>>header), but filled with zeroes or some random junk.
    >>
    >>I said I'd tested it before posting it the first time. It works.
    >>It creates a valid loop fs, containing exactly the files that are in
    >>the input ISO image.
    >
    >
    > Errr. Oops.
    >
    > Sorry everyone - the patch does not really work. I keep testing it with
    > a *file* passed on mkuzip's stdin, all the while feeling surprised that
    > lseek() works on the pipe... when there is no pipe at all :(
    >
    > I just tested it with a real pipe, and of course, it failed. Again,
    > sorry for wasting your time; I guess it'd be best if I tucked in for
    > the holidays now :(
    >
    > G'luck,
    > Peter
    >

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