ISO file creation -- procedure


 
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Old 08-28-2009
ISO file creation -- procedure

Hi All,

Am creating ISO file for same directory two times and both has different md5sum, Why does it so ?!

Am pretty sure that, there is no change in that directory between the ISO creations, So what could be issue ? Or is there any misunderstanding in the process.

Code:
mkisofs -J -R -otest1.iso ./testdir
mkisofs -J -R -otest2.iso ./testdir

Expecting both the md5sum to be same !! but it is not ??

Code:
$ md5sum test?.iso
2a1001de29b75013d1bb5a8a787cf2ef  test1.iso
d01b9b1120ec6662d582dc3af6f94338  test2.iso

Side Note: I have related question posted already here, which dont had answer, so tried other ways and the above is one of the doubt in other way... https://www.unix.com/unix-advanced-ex...-iso-file.html
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GRML2ISO(8)															       GRML2ISO(8)

NAME
grml2iso - create a multiboot grml ISO using grml2usb SYNOPSIS
grml2iso -o <target.iso> <ISO[s]> Important! The grml team does not take responsibility for loss of any data! INTRODUCTION
grml2iso allows you to create a multiboot grml ISO. You can specify two or more grml ISOs and will get one single multiboot ISO as a result. grml2iso requires and uses grml2usb for this task and installs grub2 as bootmanager on the multiboot ISO. OPTIONS
grml2iso supports the environment variables GRML2USB and WRKDIR. GRML2USB specifies the path to the grml2usb script you'd like to use. WRKDIR specifies the work directory for creating the filesystem. The work directory needs at least as much free disk space as the sum of all specified ISOs. -o <target.iso> This option is mandatory and specifies where the resulting multiboot grml ISO should be placed. Note that (to avoid any possible data loss) grml2iso will exit if the specified target.iso exists already. -c <directory> The content of the specified directory will be copied to the resulting multiboot grml ISO. -b <boot params> Use specified default bootoptions as default. -f Force the program to run and overwrite an existing iso image. -r <boot param> Remove specified boot parameter from existing command line. Could be specified multiple times. -p <grml2usb param> Execute grml2usb with the specified parameters. For a list of valid parameters have a look at the grml2usb webpage[1] or the grml2usb manpage -s <URI> Generate a small iso file which downloads the squashfs file from the specified URI. Due to current limitations in busyboxs wget and DNS resolution, an URL can not contain a hostname but an IP only. This is useful if you want to boot systems which support booting iso image from your local system. Besides the iso image this command also copies the squashfs file to the output directory. USAGE EXAMPLES
# grml2iso -o /tmp/grml.iso grml_2009.05.iso grml64_2009.05.iso Create multiboot ISO /tmp/grml.iso with grml_2009.05.iso and grml64_2009.05.iso. # grml2iso -b 'lang=de ssh=passwd' -c /tmp/grml-content -o /srv/grml.iso /srv/grml/grml_2009.10.iso Create a new iso with additional boot parameters and copy the content from /tmp/grml-content to the generated iso image. # grml2iso -r quiet -r vga=791 -o /srv/grml.iso /srv/grml-small_2009.10.iso Create a new iso and remove existing boot parameters quiet and vga=791. # GRML2USB=/srv/git/grml2usb grml2iso -o /srv/grml.iso /srv/grml/grml_2009.05.iso /srv/grml/grml64-medium_2009.05.iso Create multiboot ISO /srv/grml.iso with grml_2009.05.iso and grml64-medium_2009.05.iso using /srv/git/grml2usb as grml2usb script. # WRKDIR=/mnt/test/grml-tmp grml2iso -o /mnt/test/grml.iso grml_2009.05.iso grml64_2009.05.iso Use /mnt/test/grml-tmp as working directory for creating the multiboot ISO /mnt/test/grml.iso with grml_2009.05.iso and grml64_2009.05.iso. # grml2iso -p --skip-addons -o /srv/grml.iso /srv/grml-small_2009.10.iso /srv/grml64-small_2009.10.iso Don't copy the addons from the specified iso images ONLINE RESSOURCES
Check out the grml2usb webpage[1] and the grml2usb git repository[2]. BUGS
Please report feedback, bugreports and wishes to the author. AUTHORS
Michael Prokop <mika@grml.org[3]> and Thorsten Glaser <tg@mirbsd.org[4]> NOTES
1. grml2usb webpage http://grml.org/grml2usb/ 2. grml2usb git repository http://git.grml.org/?p=grml2usb.git 3. mika@grml.org mailto:mika@grml.org 4. tg@mirbsd.org mailto:tg@mirbsd.org 05/28/2012 GRML2ISO(8)