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November 15th, 2007, 06:23 AM
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Modifying linux live cd or dvd
Why?
Maybe someone find it useful and because it is easy to do. Using what? I will use Fedora 6 to modify Mandriva One 2008, but it can easily applied to any other distributions. OK, lets start. Log in as root. I like to work like root. first of all, you have iso image of Mandriva 2008 (you can download it here: link). What you need to do is to mount it to some directory. First we will make few directories and move iso image there. Code:
[root@mfc6 ~]# cd [root@mfc6 ~]# mkdir temp [root@mfc6 ~]# cd temp [root@mfc6 temp]# mkdir Mandriva [root@mfc6 temp]# cd Mandriva [root@mfc6 Mandriva]# cp <mandriva-linux-2008-one-KDE-cdrom-i586.iso location> ./ [root@mfc6 Mandriva]#mkdir mandriva [root@mfc6 Mandriva]#mkdir mandriva_new We will mount iso image in "/root/temp/Mandriva/mandriva" directory. Code:
root@mfc6 Mandriva]# cd .. [root@mfc6 Mandriva]# mount -o loop ./mandriva-linux-2008-one-KDE-cdrom-i586.iso ./mandriva [[root@mfc6 Mandriva]# cd mandriva [root@mfc6 mandriva]# ll total 99 dr-xr-xr-x 4 root root 2048 Nov 13 12:51 boot dr-xr-xr-x 2 root root 6144 Nov 13 12:51 isolinux -rw-r--r-- 1 root root 44719 Nov 13 12:51 LISEZMOI.pdf dr-xr-xr-x 2 root root 2048 Nov 15 11:24 loopbacks -rw-r--r-- 1 root root 41584 Nov 13 12:52 README.pdf -r--r--r-- 1 root root 1322 Nov 15 11:25 TRANS.TBL [root@mfc6 mandriva]# OK, now we have mounted image, but this is read only fs and we can not change anything. We will copy files in mandriva_new directory we created earlier. Code:
[root@mfc6 Mandriva]# cd /root/temp/Mandriva [root@mfc6 Mandriva]# cd /root/temp/Mandriva [root@mfc6 Mandriva]# cp -R ./mandriva ./mandriva_new [root@mfc6 Mandriva]#cd mandriva_new we don't need mounted image any more and we will unmount it. Code:
[root@mfc6 Mandriva]# umount /root/temp/Mandriva/mandriva Great ! Now we have files that we can change, but that were just files needed for El-Torito boot. find real file system used in live cd. The easiest way to find it to look at size, it is big. In this case it is "distrib.sqfs" file in "loopbacks" directory. Code:
[root@mfc6 mandriva]# cd ../mandriva_new [root@mfc6 mandriva]# cd loopbacks/ [root@mfc6 loopbacks]# ll total 704085 -rwx------ 1 root root 720982016 Nov 15 11:19 distrib.sqfs -r--r--r-- 1 root root 224 Nov 15 11:25 TRANS.TBL [root@mfc6 loopbacks]# This is file that contains squash file system. The easiest way to deal with it is to "unsquash it". (you will maybe need to install "squash-tools package") Code:
[root@mfc6 loopbacks]# unsquashfs ./distrib.sqfs created 69109 files created 6490 directories created 5991 symlinks created 17059 devices created 1 fifos [root@mfc6 loopbacks]#ll total 704784 -rwx------ 1 root root 720982016 Nov 15 12:16 distrib.sqfs drwxr-xr-x 20 root adm 4096 Oct 8 23:52 squashfs-root -r--r--r-- 1 root root 224 Nov 15 12:16 TRANS.TBL [root@mfc6 loopbacks]# Noe, lets change something. We will create file "myfile" in guest home directory Code:
[root@mfc6 loopbacks]# cd squashfs-root/ [root@mfc6 squashfs-root]# cd ./home/guest/ [root@mfc6 guest]# ll total 4 drwx------ 2 avg antivir 4096 Oct 8 10:04 tmp [root@mfc6 guest]# touch myfile [root@mfc6 guest]# It's almost finished. We just need to pack it all back. Code:
[root@mfc6 loopbacks]# cd /root/temp/Mandriva/mandriva_new/mandriva/loopbacks
[root@mfc6 loopbacks]# rm distrib.sqfs
rm: remove regular file `distrib.sqfs'? y
[root@mfc6 loopbacks]# mksquashfs ./squashfs-root ./distrib.sqfs
Creating little endian 3.0 filesystem on ./distrib.sqfs, block size 65536.
Little endian filesystem, data block size 65536, compressed data, compressed metadata, compressed fragments
Filesystem size 704080.77 Kbytes (687.58 Mbytes)
40.21% of uncompressed filesystem size (1750883.67 Kbytes)
Inode table size 994598 bytes (971.29 Kbytes)
32.82% of uncompressed inode table size (3030040 bytes)
Directory table size 935909 bytes (913.97 Kbytes)
49.14% of uncompressed directory table size (1904531 bytes)
Number of duplicate files found 5742
Number of inodes 98647
Number of files 69108
Number of fragments 6910
Number of symbolic links 5991
Number of device nodes 17059
Number of fifo nodes 1
Number of socket nodes 0
Number of directories 6488
Number of uids 7
root (0)
unknown (15)
unknown (71)
avg (500)
unknown (16)
unknown (72)
daemon (2)
Number of gids 19
unknown (103)
dbus (81)
disk (6)
uucp (14)
unknown (82)
floppy (19)
lp (7)
kmem (9)
unknown (80)
tty (5)
xfs (43)
daemon (2)
unknown (71)
adm (4)
nfsnobody (65534)
unknown (104)
mail (12)
man (15)
pvm (24)
[root@mfc6 loopbacks]#
It is almost done. The last step is to make .iso file which we can save to CD or DVD. Code:
[root@mfc6 mandriva_new]# mkisofs -J -R -T -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 8 -boot-info-table -V "MandrivaOne" -o mandriva-linux-2008-one-KDE-cdrom-i586.iso mandriva Size of boot image is 8 sectors -> No emulation 1.92% done, estimate finish Thu Nov 15 12:50:18 2007 2.30% done, estimate finish Thu Nov 15 12:50:52 2007 2.68% done, estimate finish Thu Nov 15 12:51:17 2007 3.07% done, estimate finish Thu Nov 15 12:51:03 2007 3.45% done, estimate finish Thu Nov 15 12:51:21 2007 3.83% done, estimate finish Thu Nov 15 12:51:10 2007 4.22% done, estimate finish Thu Nov 15 12:51:24 2007 4.60% done, estimate finish Thu Nov 15 12:51:36 2007 4.98% done, estimate finish Thu Nov 15 12:51:46 2007 5.37% done, estimate finish Thu Nov 15 12:51:55 2007 5.75% done, estimate finish Thu Nov 15 12:51:45 2007 6.13% done, estimate finish Thu Nov 15 12:51:36 2007 6.51% done, estimate finish Thu Nov 15 12:51:28 2007 6.90% done, estimate finish Thu Nov 15 12:51:21 2007 7.28% done, estimate finish Thu Nov 15 12:51:29 2007 7.66% done, estimate finish Thu Nov 15 12:51:23 2007 8.05% done, estimate finish Thu Nov 15 12:51:17 2007 8.43% done, estimate finish Thu Nov 15 12:51:24 2007 8.81% done, estimate finish Thu Nov 15 12:51:30 2007 9.20% done, estimate finish Thu Nov 15 12:51:36 2007 9.58% done, estimate finish Thu Nov 15 12:51:52 2007 9.96% done, estimate finish Thu Nov 15 12:52:06 2007 10.35% done, estimate finish Thu Nov 15 12:52:10 2007 10.73% done, estimate finish Thu Nov 15 12:52:13 2007 11.11% done, estimate finish Thu Nov 15 12:52:16 2007 11.49% done, estimate finish Thu Nov 15 12:52:11 2007 11.88% done, estimate finish Thu Nov 15 12:52:22 2007 12.64% done, estimate finish Thu Nov 15 12:52:35 2007 13.03% done, estimate finish Thu Nov 15 12:52:37 2007 13.41% done, estimate finish Thu Nov 15 12:52:39 2007 13.79% done, estimate finish Thu Nov 15 12:52:41 2007 14.18% done, estimate finish Thu Nov 15 12:52:43 2007 14.56% done, estimate finish Thu Nov 15 12:52:38 2007 14.94% done, estimate finish Thu Nov 15 12:52:40 2007 15.33% done, estimate finish Thu Nov 15 12:52:35 2007 15.71% done, estimate finish Thu Nov 15 12:52:30 2007 16.09% done, estimate finish Thu Nov 15 12:52:26 2007 16.48% done, estimate finish Thu Nov 15 12:52:22 2007 16.86% done, estimate finish Thu Nov 15 12:52:23 2007 17.24% done, estimate finish Thu Nov 15 12:52:19 2007 17.63% done, estimate finish Thu Nov 15 12:52:16 2007 18.01% done, estimate finish Thu Nov 15 12:52:18 2007 18.39% done, estimate finish Thu Nov 15 12:52:14 2007 18.78% done, estimate finish Thu Nov 15 12:52:16 2007 19.16% done, estimate finish Thu Nov 15 12:52:13 2007 19.54% done, estimate finish Thu Nov 15 12:52:09 2007 19.93% done, estimate finish Thu Nov 15 12:52:11 2007 20.31% done, estimate finish Thu Nov 15 12:52:08 2007 20.69% done, estimate finish Thu Nov 15 12:52:10 2007 21.07% done, estimate finish Thu Nov 15 12:52:07 2007 21.46% done, estimate finish Thu Nov 15 12:52:04 2007 21.84% done, estimate finish Thu Nov 15 12:52:06 2007 22.22% done, estimate finish Thu Nov 15 12:52:03 2007 22.61% done, estimate finish Thu Nov 15 12:52:05 2007 22.99% done, estimate finish Thu Nov 15 12:52:06 2007 23.37% done, estimate finish Thu Nov 15 12:52:08 2007 23.76% done, estimate finish Thu Nov 15 12:52:10 2007 24.14% done, estimate finish Thu Nov 15 12:52:11 2007 24.52% done, estimate finish Thu Nov 15 12:52:09 2007 24.91% done, estimate finish Thu Nov 15 12:52:10 2007 25.29% done, estimate finish Thu Nov 15 12:52:12 2007 25.67% done, estimate finish Thu Nov 15 12:52:09 2007 26.06% done, estimate finish Thu Nov 15 12:52:07 2007 26.44% done, estimate finish Thu Nov 15 12:52:08 2007 26.82% done, estimate finish Thu Nov 15 12:52:06 2007 27.20% done, estimate finish Thu Nov 15 12:52:07 2007 27.59% done, estimate finish Thu Nov 15 12:52:05 2007 27.97% done, estimate finish Thu Nov 15 12:52:03 2007 28.35% done, estimate finish Thu Nov 15 12:52:04 2007 28.74% done, estimate finish Thu Nov 15 12:52:06 2007 29.12% done, estimate finish Thu Nov 15 12:52:03 2007 29.50% done, estimate finish Thu Nov 15 12:52:05 2007 29.89% done, estimate finish Thu Nov 15 12:52:03 2007 30.27% done, estimate finish Thu Nov 15 12:52:01 2007 30.65% done, estimate finish Thu Nov 15 12:52:02 2007 31.04% done, estimate finish Thu Nov 15 12:52:00 2007 31.42% done, estimate finish Thu Nov 15 12:52:01 2007 31.80% done, estimate finish Thu Nov 15 12:52:00 2007 32.19% done, estimate finish Thu Nov 15 12:51:58 2007 32.57% done, estimate finish Thu Nov 15 12:51:56 2007 32.95% done, estimate finish Thu Nov 15 12:51:57 2007 33.34% done, estimate finish Thu Nov 15 12:52:01 2007 33.72% done, estimate finish Thu Nov 15 12:52:00 2007 34.10% done, estimate finish Thu Nov 15 12:52:01 2007 34.49% done, estimate finish Thu Nov 15 12:51:59 2007 34.87% done, estimate finish Thu Nov 15 12:52:00 2007 35.25% done, estimate finish Thu Nov 15 12:51:59 2007 35.63% done, estimate finish Thu Nov 15 12:52:00 2007 36.02% done, estimate finish Thu Nov 15 12:51:58 2007 36.40% done, estimate finish Thu Nov 15 12:51:57 2007 36.78% done, estimate finish Thu Nov 15 12:51:58 2007 37.17% done, estimate finish Thu Nov 15 12:51:59 2007 37.55% done, estimate finish Thu Nov 15 12:51:57 2007 37.93% done, estimate finish Thu Nov 15 12:51:58 2007 38.32% done, estimate finish Thu Nov 15 12:51:57 2007 38.70% done, estimate finish Thu Nov 15 12:51:58 2007 39.08% done, estimate finish Thu Nov 15 12:51:56 2007 39.47% done, estimate finish Thu Nov 15 12:51:58 2007 39.85% done, estimate finish Thu Nov 15 12:51:56 2007 40.23% done, estimate finish Thu Nov 15 12:51:55 2007 40.62% done, estimate finish Thu Nov 15 12:51:53 2007 41.00% done, estimate finish Thu Nov 15 12:51:54 2007 41.38% done, estimate finish Thu Nov 15 12:51:53 2007 41.76% done, estimate finish Thu Nov 15 12:51:52 2007 42.15% done, estimate finish Thu Nov 15 12:51:55 2007 42.53% done, estimate finish Thu Nov 15 12:51:56 2007 42.91% done, estimate finish Thu Nov 15 12:51:57 2007 43.30% done, estimate finish Thu Nov 15 12:51:56 2007 43.68% done, estimate finish Thu Nov 15 12:51:57 2007 44.06% done, estimate finish Thu Nov 15 12:51:55 2007 44.45% done, estimate finish Thu Nov 15 12:51:56 2007 44.83% done, estimate finish Thu Nov 15 12:51:57 2007 45.21% done, estimate finish Thu Nov 15 12:51:56 2007 45.60% done, estimate finish Thu Nov 15 12:51:55 2007 45.98% done, estimate finish Thu Nov 15 12:51:56 2007 46.36% done, estimate finish Thu Nov 15 12:51:56 2007 46.75% done, estimate finish Thu Nov 15 12:52:00 2007 47.13% done, estimate finish Thu Nov 15 12:51:58 2007 47.51% done, estimate finish Thu Nov 15 12:51:59 2007 47.90% done, estimate finish Thu Nov 15 12:52:00 2007 48.28% done, estimate finish Thu Nov 15 12:51:59 2007 48.66% done, estimate finish Thu Nov 15 12:52:00 2007 49.05% done, estimate finish Thu Nov 15 12:52:00 2007 49.43% done, estimate finish Thu Nov 15 12:52:01 2007 49.81% done, estimate finish Thu Nov 15 12:52:02 2007 50.19% done, estimate finish Thu Nov 15 12:52:03 2007 50.58% done, estimate finish Thu Nov 15 12:52:06 2007 50.96% done, estimate finish Thu Nov 15 12:52:04 2007 51.34% done, estimate finish Thu Nov 15 12:52:07 2007 51.73% done, estimate finish Thu Nov 15 12:52:06 2007 52.11% done, estimate finish Thu Nov 15 12:52:07 2007 52.49% done, estimate finish Thu Nov 15 12:52:06 2007 52.88% done, estimate finish Thu Nov 15 12:52:04 2007 53.26% done, estimate finish Thu Nov 15 12:52:03 2007 53.64% done, estimate finish Thu Nov 15 12:52:04 2007 54.03% done, estimate finish Thu Nov 15 12:52:03 2007 54.41% done, estimate finish Thu Nov 15 12:52:05 2007 54.79% done, estimate finish Thu Nov 15 12:52:06 2007 55.18% done, estimate finish Thu Nov 15 12:52:07 2007 55.56% done, estimate finish Thu Nov 15 12:52:06 2007 55.94% done, estimate finish Thu Nov 15 12:52:08 2007 56.33% done, estimate finish Thu Nov 15 12:52:09 2007 56.71% done, estimate finish Thu Nov 15 12:52:09 2007 57.09% done, estimate finish Thu Nov 15 12:52:10 2007 57.47% done, estimate finish Thu Nov 15 12:52:09 2007 57.86% done, estimate finish Thu Nov 15 12:52:08 2007 58.24% done, estimate finish Thu Nov 15 12:52:09 2007 58.62% done, estimate finish Thu Nov 15 12:52:09 2007 59.01% done, estimate finish Thu Nov 15 12:52:08 2007 59.39% done, estimate finish Thu Nov 15 12:52:09 2007 59.77% done, estimate finish Thu Nov 15 12:52:09 2007 60.16% done, estimate finish Thu Nov 15 12:52:08 2007 60.54% done, estimate finish Thu Nov 15 12:52:09 2007 60.92% done, estimate finish Thu Nov 15 12:52:08 2007 61.31% done, estimate finish Thu Nov 15 12:52:07 2007 61.69% done, estimate finish Thu Nov 15 12:52:08 2007 62.07% done, estimate finish Thu Nov 15 12:52:07 2007 62.46% done, estimate finish Thu Nov 15 12:52:06 2007 62.84% done, estimate finish Thu Nov 15 12:52:06 2007 63.22% done, estimate finish Thu Nov 15 12:52:07 2007 63.61% done, estimate finish Thu Nov 15 12:52:06 2007 63.99% done, estimate finish Thu Nov 15 12:52:05 2007 64.37% done, estimate finish Thu Nov 15 12:52:06 2007 64.76% done, estimate finish Thu Nov 15 12:52:05 2007 65.14% done, estimate finish Thu Nov 15 12:52:05 2007 65.52% done, estimate finish Thu Nov 15 12:52:04 2007 65.90% done, estimate finish Thu Nov 15 12:52:03 2007 66.29% done, estimate finish Thu Nov 15 12:52:04 2007 66.67% done, estimate finish Thu Nov 15 12:52:03 2007 67.05% done, estimate finish Thu Nov 15 12:52:02 2007 67.44% done, estimate finish Thu Nov 15 12:52:03 2007 67.82% done, estimate finish Thu Nov 15 12:52:02 2007 68.20% done, estimate finish Thu Nov 15 12:52:02 2007 68.59% done, estimate finish Thu Nov 15 12:52:03 2007 68.97% done, estimate finish Thu Nov 15 12:52:04 2007 69.35% done, estimate finish Thu Nov 15 12:52:04 2007 69.74% done, estimate finish Thu Nov 15 12:52:05 2007 70.12% done, estimate finish Thu Nov 15 12:52:05 2007 70.50% done, estimate finish Thu Nov 15 12:52:04 2007 70.89% done, estimate finish Thu Nov 15 12:52:05 2007 71.27% done, estimate finish Thu 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done, estimate finish Thu Nov 15 12:52:06 2007 78.93% done, estimate finish Thu Nov 15 12:52:06 2007 79.32% done, estimate finish Thu Nov 15 12:52:07 2007 79.70% done, estimate finish Thu Nov 15 12:52:06 2007 80.08% done, estimate finish Thu Nov 15 12:52:07 2007 80.46% done, estimate finish Thu Nov 15 12:52:07 2007 80.85% done, estimate finish Thu Nov 15 12:52:08 2007 81.23% done, estimate finish Thu Nov 15 12:52:12 2007 81.61% done, estimate finish Thu Nov 15 12:52:12 2007 82.00% done, estimate finish Thu Nov 15 12:52:11 2007 82.38% done, estimate finish Thu Nov 15 12:52:12 2007 82.76% done, estimate finish Thu Nov 15 12:52:12 2007 83.15% done, estimate finish Thu Nov 15 12:52:13 2007 83.53% done, estimate finish Thu Nov 15 12:52:13 2007 83.91% done, estimate finish Thu Nov 15 12:52:12 2007 84.30% done, estimate finish Thu Nov 15 12:52:13 2007 84.68% done, estimate finish Thu Nov 15 12:52:12 2007 85.06% done, estimate finish Thu Nov 15 12:52:14 2007 85.45% done, estimate finish Thu 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done, estimate finish Thu Nov 15 12:52:26 2007 93.88% done, estimate finish Thu Nov 15 12:52:26 2007 94.26% done, estimate finish Thu Nov 15 12:52:25 2007 94.64% done, estimate finish Thu Nov 15 12:52:25 2007 95.03% done, estimate finish Thu Nov 15 12:52:24 2007 95.41% done, estimate finish Thu Nov 15 12:52:25 2007 95.79% done, estimate finish Thu Nov 15 12:52:24 2007 96.17% done, estimate finish Thu Nov 15 12:52:24 2007 96.56% done, estimate finish Thu Nov 15 12:52:25 2007 96.94% done, estimate finish Thu Nov 15 12:52:25 2007 97.32% done, estimate finish Thu Nov 15 12:52:25 2007 97.71% done, estimate finish Thu Nov 15 12:52:26 2007 98.09% done, estimate finish Thu Nov 15 12:52:27 2007 98.47% done, estimate finish Thu Nov 15 12:52:27 2007 98.86% done, estimate finish Thu Nov 15 12:52:27 2007 99.24% done, estimate finish Thu Nov 15 12:52:26 2007 99.62% done, estimate finish Thu Nov 15 12:52:25 2007 Total translation table size: 23744854 Total rockridge attributes bytes: 10834503 Total directory bytes: 25128138 Path table size(bytes): 93894 Max brk space used 686d000 1304927 extents written (2548 MB) [root@mfc6 mandriva_new]# That's it you have your modified iso image. You just have to burn it to disk as you would with original one. After booting it:  Notes When making iso image with : mkisofs -J -R -T -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 8 -boot-info-table -V "MandrivaOne" -o mandriva-linux-2008-one-KDE-cdrom-i586.iso mandriva be sure to label disk with "MandrivaOne" EXACTLY. otherwise system will not be able to find sqfs file during boot process. Instead of squash and unsquash you could mount it but it will be readonly fs. mount -t squashfs -o loop ./distrib.sqfs ./tmp2 It could be useful to use vmWare or something like that to test if your new iso image is working before you burn it to real CD/DVD, just in case that something go wrong. You can do it if you go to devices setting in vmware and choose cd device to use iso image instead of real device. That way might save you few blank CDs or DVDs. And the last one, after burning CD/DVD make sure to use CD marker to label CD/DVD. Be carefull not to damage CD/DVD during that process. Last edited by mphill : November 29th, 2007 at 01:38 PM.
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November 15th, 2007, 06:41 AM
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nice guid; however, too much work for me. i'll just live w/ what's on the live cd. i wish i knew this much about linux.
__________________
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November 15th, 2007, 06:53 AM
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Mp, I'm going to sticky this...I'd like to see some other worthwhile modifications.
 
__________________
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May 23rd, 2008, 01:06 PM
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THis is an awesome thread, and I am definitely going to give this a try at some point in time!
I was going to try and build my own distribution of some sort at some point in time - and this sounds like an alternative way of doing so. Many Kudos for figuring this out, or putting the research/know-how into it!
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May 26th, 2008, 02:45 AM
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If you need any help, just ask.
Also with building your own distribution.
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