mylivecd failed - what did I do wrong?

[AS]

Thank you.

Please consider that LZMA is deprecated, either use the the default, --xz, or use --gzip.

I copied the LZMA parameter from 'remasterme'.  However, I will change my script to --xz as you suggest.

A recap about compression:
default: (--xz with additional options for increased compression), better compression and slower processing.
--xz (without additional options), nearly as above a bit less compression and a bit faster.
--lzma (deprecated)
--gzip   worse compression compared to xz, much faster ... up to 3x.

I would suggest --gzip in your case, you will obtain a little larger ISO but you will gain a lot in speed.

The kernel version in use at the time was 2.6.38.8-pclos1.bfs  I have since installed 2.6.38.8-pclos3.bfs

The size of the iso:

$ ls -l /data/isos/remaster-2010.iso
-rw-r--r-- 1 root root 1030637568 Mar 12 07:45 /data/isos/remaster-2010.iso

isomd5sum  No, that package is NOT installed.

I know that isomd5sum is a package that conflict with mediacheck package, both packages provide implantisomd5 ...
just to be 100% sure, reinstall the mediacheck package, still doesn't seem to be your issue.

It's indeed puzzling that mediacheck result in SUCCESS and the md5sums doesn't match ...

Are you using RW DVD ?

[ternor]

Thanks.  Yes.  I have always used RW DVD.  I have 7 disks which I use and reuse for remasters because I create a remaster after each major update.  I have changed to --gzip after reading your post in another thread.

I will remove mediacheck completely and install it again.

[ternor]

I ran mediacheck again for the same disk and the disk passed again.

[AS]

I'm out of ideas right now ... don't know what to suggest... there could be one test but might be a bit annoying and will require a few command line ... basically a comparison of the live.sqfs image contained inside both the ISO file and the DVD media, if you want try it:

from a terminal, su to root:

Code: [Select]

mkdir /tmp/iso
mkdir /tmp/dvd

mount /data/isos/remaster-2010.iso  /tmp/iso
mount /dev/sr0  /tmp/dvd

ls -l /tmp/iso/livecd.sqfs
ls -l /tmp/dvd/livecd.sqfs

md5sum /tmp/iso/livecd.sqfs
md5sum /tmp/dvd/livecd.sqfs

umount /tmp/dvd
umount /tmp/iso

rmdir /tmp/iso /tmp/dvd
You should not get any error, other than a mount read-only warning at time of mount operations.
copy and paste here your result.

[ternor]

Thanks. livecd.sqfs returned the same md5sum in each case.  This is copied from the terminal:

# mount /data/isos/remaster-2010.iso  /tmp/iso
mount: warning: /tmp/iso seems to be mounted read-only.
# mount /dev/sr0  /tmp/dvd
mount: warning: /tmp/dvd seems to be mounted read-only.
# ls -l /tmp/iso/livecd.sqfs
-rw-r--r-- 1 root root 1011499008 Mar 12 07:44 /tmp/iso/livecd.sqfs
# ls -l /tmp/dvd/livecd.sqfs
-rw-r--r-- 1 root root 1011499008 Mar 12 07:44 /tmp/dvd/livecd.sqfs
# md5sum /tmp/iso/livecd.sqfs
cfbdc63bda4218ab84cd2b5cd97d3bdf  /tmp/iso/livecd.sqfs
# md5sum /tmp/dvd/livecd.sqfs
cfbdc63bda4218ab84cd2b5cd97d3bdf  /tmp/dvd/livecd.sqfs
# umount /tmp/dvd
# umount /tmp/iso
# rmdir /tmp/iso /tmp/dvd
#

[wedgetail]

aguila

[root@localhost andreas]# mylivecd --nodir ^/home/andreas/Bilder/ PCLOS_2012.03_Remaster.iso

Do you run without the red? Your line does not exclude your /home/..... so I hope this is not big?

Sorry I only came flying past, not looked hard here.  I am curious about that line though.    

[AS]

Thanks. livecd.sqfs returned the same md5sum in each case.  This is copied from the terminal:

# mount /data/isos/remaster-2010.iso  /tmp/iso
mount: warning: /tmp/iso seems to be mounted read-only.
# mount /dev/sr0  /tmp/dvd
mount: warning: /tmp/dvd seems to be mounted read-only.
# ls -l /tmp/iso/livecd.sqfs
-rw-r--r-- 1 root root 1011499008 Mar 12 07:44 /tmp/iso/livecd.sqfs
# ls -l /tmp/dvd/livecd.sqfs
-rw-r--r-- 1 root root 1011499008 Mar 12 07:44 /tmp/dvd/livecd.sqfs
# md5sum /tmp/iso/livecd.sqfs
cfbdc63bda4218ab84cd2b5cd97d3bdf  /tmp/iso/livecd.sqfs
# md5sum /tmp/dvd/livecd.sqfs
cfbdc63bda4218ab84cd2b5cd97d3bdf  /tmp/dvd/livecd.sqfs
# umount /tmp/dvd
# umount /tmp/iso
# rmdir /tmp/iso /tmp/dvd
#

That's mean that all your data are fine, the other content of the ISO images are the bootloader  the kernel, the initrd image,
all files necessary to boot and the LiveDVD...

I would say also that also mediacheck is correct, and that md5sums may be incorrect when reading the DVD ...

What application did you used to burn the DVD ? (well, you could try a different one ...)

aguila

[root@localhost andreas]# mylivecd --nodir ^/home/andreas/Bilder/ PCLOS_2012.03_Remaster.iso

Do you run without the red? Your line does not exclude your /home/..... so I hope this is not big?

Sorry I only came flying past, not looked hard here.  I am curious about that line though.    

wedgetail,
aguila will be happy to correct his command line, however it's not that /home will not be excluded, it is that /home will be excluded and eventually a directory home in some other place ... say "/data/home" will be excluded too.. 

[ternor]

Thanks, AS.  I used GnomeBaker as usual.  I may give k3b a shot but that caused me problems when I used to use it.

[wedgetail]

ternor
Now I have read your posts too. That is intriguing.  Assuming that the data on the burnt DVD is correct, does it boot?   

[ternor]

I have overwritten the first.  I will try the second and report back.

I overwrote the first disk by burning the iso again using k3b and it returns the correct md5sum now.  I tried grafburner first and have no idea what it did but it certainly didn't burn the iso to the disk.

Edit: I believed that the problem was caused by mylivecd because I created the iso just after updating mylivecd.  I'm glad to know it's ok.

[ternor]

The disk with an incorrect md5sum booted and I was able to log in.  I didn't take the experience any further.

[wedgetail]

ternor
Thanks for the effort. I don't know what to think about this.  I did have a very strange session with k3b where I actually did check md5sum values against values held in separate downloaded file. (7 ISO's various pclos systems) I experienced that when I used the k3b facility "copy checksum to clipboard" and then pasting this into the file with the checksum, sometimes it would go wrong.

I did not really work out more than probably me doing some odd movement or something as a repeat exercise might be fine. 

Does make it hard when you start loosing faith in what you are doing.     Hope it is the last time you will see this problem

[ternor]

I'm not hopeful.  I stopped using k3b about 2 years ago because several relatively new disks became unreadable.  I used to use k3b's multi-session capability for backups.  Since then, I have used gnomebaker without a problem until a few days ago.

Now gnomebaker has possibly failed and k3b produces a good result.  Possible solution: delete all gnomebaker configuration files.