Re: [debian-knoppix] remastering: problems with create_compressed_fs
Hi Isabella
Would be nice to know how you decompressed the image and copied the source, too. I am still not sure if the problem actually is the compression
Thanks
Simon
On Mon, 30 Jun 2003 17:17:30 -0700
"Isabella" <isabella@fatport.ca> wrote:
> This is the Knoppix script I use to create the iso:
>
> #!/bin/bash
> rm /KNOPPIX/New-Master/KNOPPIX/KNOPPIX
> mkisofs -R /KNOPPIX/New-Source | create_compressed_fs - 65536 >
> /KNOPPIX/New-Master/KNOPPIX/KNOPPIX
> mkisofs -r -J -b KNOPPIX/boot.img -c KNOPPIX/boot.cat -o
> /mnt/windows/new.iso /KNOPPIX/New-Master
> echo "Done"
>
> The only time I have had problems with iso images being too large was when I
> forgot to delete stuff I had copied over. I have done a bunch of custom
> builds where the only thing I did was create 3 text files in /etc/init.d/,
> and the re-compressed iso fit onto a 700meg CD. PEBKAC.
>
>
> -Isabella
>
>
> ----- Original Message -----
> From: "Simon Friedberger" <knoppix@friedberger.de>
> To: <debian-knoppix@linuxtag.org>
> Sent: Monday, June 30, 2003 5:07 PM
> Subject: Re: [debian-knoppix] remastering: problems with
> create_compressed_fs
>
>
> >
> >
> > Actually i did exactly the same but with mounting with cloop and guess
> what? my file had 733....bytes ...? ok so we agree there is some overhead?
> but how can i get rid of it? ;)
> > smaller block size?
> >
> > good night
> > Simon
> >
> >
> > --
> > On Mon, 30 Jun 2003 15:38:39 -0700
> > Jared Rhine <jared@wordzoo.com> wrote:
> >
> > > [Klaus == knopper@linuxtag.org on Sun, 29 Jun 2003 23:09:03 +0200]
> > >
> > > >> i decompressed the KNOPPIX cloop fs and compressed it again ...and
> > > >> it had grown about 10mb
> > >
> > > Klaus> Watch out for hardlinks! This could be the reason.
> > >
> > > It could also be that compression is not perfectly symmetric; that
> > > uncompressing and recompressing again produces a slightly larger file.
> > > There's some evidence for this, shown below. Doing an uncompress
> > > followed immediately by a compress expands the KNOPPIX file from
> > > 725,032,363 bytes to 727,812,929 bytes. This probably doesn't happen
> > > when mounting using cloop loopback.
> > >
> > > -- begin --
> > >
> > > -> cd /mnt/d4/test
> > >
> > > -> ls -l
> > > total 716836
> > > -rw-r--r-- 1 jared jared 733317120 Jun 30 03:48
> knoppix_v3.2-2003-06-06-en.iso
> > >
> > > -> sudo mount -t iso9660 -o loop knoppix_v3.2-2003-06-06-en.iso
> /mnt/test
> > >
> > > -> ls -l /mnt/test/KNOPPIX/KNOPPIX
> > > -r--r--r-- 1 root root 725032363 Jun 6 09:06
> /mnt/test/KNOPPIX/KNOPPIX
> > >
> > > -> extract_compressed_fs /mnt/test/KNOPPIX/KNOPPIX >
> /mnt/d4/test/extracted
> > > 29239 blocks of size 65536. Preamble:
> > > #!/bin/sh
> > > insmod cloop.o file=$0 && mount -r -t iso9660 /dev/cloop $1
> > > exit $?
> > >
> > > Block 0 length 11945 => 65536
> > > Block 1 length 30324 => 65536
> > > Block 2 length 30546 => 65536
> > > Block 3 length 29327 => 65536
> > > Block head:78DAECBD877F1CD5
> > > Block tail:61CF0E315D18D948
> > > Block 4 length 34020 => 65536
> > > Block 5 length 18788 => 65536
> > > Block 6 length 9368 => 65536
> > > [...]
> > >
> > > -> ls -l .
> > > total 2589964
> > > -rw-r--r-- 1 jared jared 1916207104 Jun 30 04:13 extracted
> > > -rw-r--r-- 1 jared jared 733317120 Jun 30 03:48
> knoppix_v3.2-2003-06-06-en.iso
> > >
> > > -> cat extracted | create_compressed_fs - 65536 > recompressed
> > > Block# 0 size 65536 -> 11963 [compression ratio 18%, overall:
> 18%]
> > > Block# 1 size 65536 -> 30321 [compression ratio 46%, overall:
> 32%]
> > > Block# 2 size 65536 -> 30545 [compression ratio 46%, overall:
> 37%]
> > > [...]
> > >
> > > -> ls -l /mnt/test/KNOPPIX/KNOPPIX /mnt/d4/test
> > > -r--r--r-- 1 root root 725032363 Jun 6 09:06
> /mnt/test/KNOPPIX/KNOPPIX
> > >
> > > /mnt/d4/test:
> > > total 3301420
> > > -rw-r--r-- 1 jared jared 1916207104 Jun 30 04:13 extracted
> > > -rw-r--r-- 1 jared jared 733317120 Jun 30 03:48
> knoppix_v3.2-2003-06-06-en.iso
> > > -rw-r--r-- 1 jared jared 727812929 Jun 30 05:29 recompressed
> > >
> > > -- end --
> > >
> > > -- jared@wordzoo.com
> > >
> > > "A black hole is where God is dividing by zero."
> > > -- attributed to Roger Smith
> > > _______________________________________________
> > > debian-knoppix mailing list
> > > debian-knoppix@linuxtag.org
> > > http://mailman.linuxtag.org/mailman/listinfo/debian-knoppix
> >
> >
> > --
> > _______________________________________________
> > debian-knoppix mailing list
> > debian-knoppix@linuxtag.org
> > http://mailman.linuxtag.org/mailman/listinfo/debian-knoppix
>
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