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A Simple Guide on How to edit Solaris 11.4 Install ISO image

Narendra Kumar SS
Principal Software Engineer

Sometimes a developer would want to test his/her executable (which might contain some bug fix or could be a debug binary). And if this binary needs to be executed during Operating System Install process, then this binary will have to be inserted into the install media (the iso image). The iso media is having its own filesystem layout and we cannot add anything to it directly. The user will have to extract the contents of the iso, edit it and then again convert it back to iso form. Here below I explain a step-by-step mechanism to achieve this.

Login to a Solaris machine, download the Solaris Install DVD image (ISO format) and save it to a local folder.

Solaris Install DVD images can be downloaded from: https://www.oracle.com/solaris/solaris11/downloads/solaris11-install-downloads.html

Path to the Solaris Install ISO image that I downloaded and saved on my system: /var/tmp/sol-11_4_24_72_0-text-x86.iso

Please note that, all the commands need root or superuser authorization.

Create 3 temporary directories /root/ai, /root/ai/image and /mnt/ai. We use these temporary directories to mount the ISO filesystem and extracting its contents.

# mkdir /root/ai /root/ai/image /mnt/ai

The following command mounts the ISO image at /mnt/ai:

# mount -F hsfs $(lofiadm -a /var/tmp/sol-11_4_24_72_0-text-x86.iso) /mnt/ai

Now copy the filesystem mounted at /mnt/ai to /root/ai/image using cpio command:# cd /mnt/ai

# find . -depth -print | cpio -pdm /root/ai/image

Create the temporary directories /root/ai/zlib and /mnt/zlib for next stage of processing:

# mkdir /root/ai/zlib /mnt/zlib

The following command mounts the zlib image at /mnt/zlib:

# mount -F hsfs $(lofiadm -a /root/ai/image/solaris.zlib) /mnt/zlib

Now copy the contents of /mnt/zlib to /root/ai/zlib using cpio command:

# cd /mnt/zlib

# find . -depth -print | cpio -pdm /root/ai/zlib

Now the install image files are located at /root/ai/zlib and /root/ai/image directories. Now you can modify or replace any file you want in these directories.

# cd /root/ai/zlib

Recreate Solaris zlib image using the following command (it will get saved as mysolaris.zlib):

# mkisofs -o /root/ai/mysolaris.zlib -quiet -N -l -R -U -allow-multidot -no-iso-translate -cache-inodes -d -D -V "compress" /root/ai/zlib/

# lofiadm -C lzma /root/ai/mysolaris.zlib

Copy back the mysolaris.zlib back to /root/ai/image/solaris.zlib:

# cp /root/ai/mysolaris.zlib /root/ai/image/solaris.zlib

Create the new ISO image using the command:

# mkisofs -o /var/tmp/sol-11_4_24_72_0-text-x86_new.iso -c .catalog -eltorito-boot boot/bios.img -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-# platform efi -eltorito-boot boot/uefi.img -no-emul-boot -eltorito-platform 0xaf -eltorito-boot zvboot -no-emul-boot -U -allow-multidot -no-iso-translate -cache-inodes -N -l -R -D -volset tcu24-02.us.oracle.com-2014-02-01T22:13:56.652251 -V Oracle_Solaris_Text_X86 /root/ai/image

The new ISO file is ready and it is saved as: /var/tmp/sol-11_4_24_72_0-text-x86_new.iso This new ISO image has your changes inside.

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