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Thread: create custom iso and install to usb stick from shell

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  1. #1
    Join Date
    May 2012
    Beans
    4

    create custom iso and install to usb stick from shell

    I'm unable to install customized Ubuntu ISO image to a USB stick. The shell script I use looks as follows:

    Code:
    ISO1=~/ubuntu-12.04-server-amd64.iso
    mkdir /mnt/ubuntu > /dev/null 2>&1
    umount /mnt/ubuntu > /dev/null 2>&1
    mount -o loop $ISO1 /mnt/ubuntu
    rm -rf ~/ubuntu
    rsync -av /mnt/ubuntu/ ~/ubuntu
    ISO2=~/custom.iso
    mkisofs -r -V "Custom Install CD" \
        -cache-inodes \
        -J -l -b isolinux/isolinux.bin \
        -c isolinux/boot.cat -no-emul-boot \
        -boot-load-size 4 -boot-info-table \
        -o $ISO2 ~/ubuntu
    dd if=$ISO2 of=/dev/sdb bs=1M
    fdisk -l
    and that produces the output:

    Code:
    # mkisofs >>>
    ...
    Total translation table size: 2048
    Total rockridge attributes bytes: 367970
    Total directory bytes: 1904522
    Path table size(bytes): 15792
    Max brk space used 36a000
    350884 extents written (685 MB)
    
    # fdisk >>>
    ...
    Disk /dev/sdb: 7946 MB, 7946108928 bytes
    245 heads, 62 sectors/track, 1021 cylinders, total 15519744 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000
    
    Disk /dev/sdb doesn't contain a valid partition table
    The ISO image ~/custom.iso created by the mkisofs command works just fine. I'm able to boot and install operating system using this image. But USB stick dosen't.

    I tested the original ISO image:

    Code:
    ISO1=~/ubuntu-12.04-server-amd64.iso
    dd if=$ISO1 of=/dev/sdb bs=1M
    fdisk -l
    that produces the output:

    Code:
    # fdisk >>>
    ...
    Disk /dev/sdb: 7946 MB, 7946108928 bytes
    19 heads, 24 sectors/track, 34034 cylinders, total 15519744 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x2b5332bb
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdb1   *          64     1401431      700684   17  Hidden HPFS/NTFS
    This does work as expected - boots and installs without any problems from USB stick. So, my question is how can I create a customized Ubuntu image from shell that can be transferred properly to a USB stick?

  2. #2
    Join Date
    May 2012
    Beans
    4

    [SOLVED] Re: create custom iso and install to usb stick from shell

    In the above example mkisofs did not create a valid partition table. Using xorriso command with -isohybrid-mbr solves the problem.

    Code:
    xorriso -as mkisofs \
        -D -r -J -joliet-long -l -V "Custom Install CD" \
        -b isolinux/isolinux.bin \
        -c isolinux/boot.cat \
        -iso-level 3 -no-emul-boot -partition_offset 16 -boot-load-size 4 -boot-info-table \
        -isohybrid-mbr /usr/lib/syslinux/isohdpfx.bin \
        -o $ISO2 ~/ubuntu

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