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Simple Python Script to Edit an Ubuntu ISO to Add Automated Server Install Capability
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| import io | |
| import pathlib | |
| import pycdlib | |
| ubuntu = pathlib.Path('ubuntu-22.04.1-live-server-amd64.iso') | |
| new_iso_path = pathlib.Path('ubuntu-22.04.1-live-server-amd64-auto.iso') | |
| iso = pycdlib.PyCdlib() | |
| iso.open(ubuntu) | |
| extracted = io.BytesIO() | |
| iso.get_file_from_iso_fp(extracted, iso_path='/BOOT/GRUB/GRUB.CFG;1') | |
| extracted.seek(0) | |
| data = extracted.read() | |
| print(data.decode()) | |
| new = data.replace(b' ---', b'quiet autoinstall ds=nocloud\;s=/cdrom/nocloud/ ---') | |
| print(new.decode()) | |
| iso.rm_file(iso_path='/BOOT/GRUB/GRUB.CFG;1', rr_name='grub.cfg') | |
| iso.add_fp(io.BytesIO(new), len(new), '/BOOT/GRUB/GRUB.CFG;1', rr_name='grub.cfg') | |
| iso.add_directory('/NOCLOUD', rr_name='nocloud') | |
| user_data = b"""#cloud-config | |
| autoinstall: | |
| version: 1 | |
| identity: | |
| hostname: ubuntu-server | |
| password: "$6$exDY1mhS4KUYCE/2$zmn9ToZwTKLhCw.b4/b.ZRTIZM30JZ4QrOQ2aOXJ8yk96xpcCof0kxKwuX1kqLG/ygbJ1f8wxED22bTL4F46P0" | |
| username: ubuntu | |
| """ | |
| iso.add_fp(io.BytesIO(user_data), len(user_data), '/NOCLOUD/USER_DATA;1', rr_name='user-data') | |
| iso.add_fp(io.BytesIO(b''), len(b''), '/NOCLOUD/META_DATA;1', rr_name='meta-data') | |
| iso.write(new_iso_path) | |
| iso.close() |
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| import io | |
| import pathlib | |
| import pycdlib | |
| ubuntu = pathlib.Path('ubuntu-22.04.1-live-server-amd64.iso') | |
| new_iso = pathlib.Path('ubuntu-22.04.1-live-server-amd64-auto.iso') | |
| iso = pycdlib.PyCdlib() | |
| iso.open(ubuntu) | |
| extracted = io.BytesIO() | |
| iso.get_file_from_iso_fp(extracted, iso_path='/BOOT/GRUB/GRUB.CFG;1') | |
| extracted.seek(0) | |
| data = extracted.read() | |
| print(data.decode()) | |
| new = data.replace(b' ---', b'quiet autoinstall ---').replace(b'timeout=30', b'timeout=1') | |
| print(new.decode()) | |
| iso.rm_file(iso_path='/BOOT/GRUB/GRUB.CFG;1', rr_name='grub.cfg') | |
| iso.add_fp(io.BytesIO(new), len(new), '/BOOT/GRUB/GRUB.CFG;1', rr_name='grub.cfg') | |
| iso.write(new_iso) | |
| iso.close() |
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| import io | |
| import pathlib | |
| import pycdlib | |
| new_iso = pathlib.Path('ubuntu-22.04-auto.iso') | |
| iso = pycdlib.PyCdlib() | |
| iso.new(rock_ridge='1.09', vol_ident='CIDATA') | |
| user_data = b"""#cloud-config | |
| autoinstall: | |
| version: 1 | |
| identity: | |
| hostname: ubuntu-server | |
| password: "$6$exDY1mhS4KUYCE/2$zmn9ToZwTKLhCw.b4/b.ZRTIZM30JZ4QrOQ2aOXJ8yk96xpcCof0kxKwuX1kqLG/ygbJ1f8wxED22bTL4F46P0" | |
| username: ubuntu | |
| """ | |
| iso.add_fp(io.BytesIO(user_data), len(user_data), '/USERDATA;1', rr_name='user-data') | |
| iso.add_fp(io.BytesIO(b''), len(b''), '/METADATA;1', rr_name='meta-data') | |
| iso.write(new_iso) | |
| iso.close() |
Made some modifications to disable the verifications for future reference.
import io
import pathlib
import pycdlib
ubuntu = pathlib.Path('ubuntu-20.04.5-live-server-amd64.iso')
new_iso = pathlib.Path('ubuntu-20.04.5-live-server-amd64-auto.iso')
iso = pycdlib.PyCdlib()
iso.open(ubuntu)
extracted = io.BytesIO()
iso.get_file_from_iso_fp(extracted, iso_path='/BOOT/GRUB/GRUB.CFG;1')
extracted.seek(0)
data = extracted.read()
print(data.decode())
new = data.replace(b'Install Ubuntu Server', b'Autoinstall Ubuntu Server - Disabled Verfification').replace(b' ---', b'quiet autoinstall fsck.mode=skip ---').replace(b'timeout=30', b'timeout=1')
print(new.decode())
iso.rm_file(iso_path='/BOOT/GRUB/GRUB.CFG;1', rr_name='grub.cfg')
iso.add_fp(io.BytesIO(new), len(new), '/BOOT/GRUB/GRUB.CFG;1', rr_name='grub.cfg')
iso.write(new_iso)
iso.close()
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Thanks, I personally don't require a verification check. I just happened to notice during the process it was failing validation from the change to the grub.cfg. Thanks for posting the additional content to disable the check and thanks for your work! Made my life easier that's for sure :)