Invalid padding on ISO Error

[h4xhor]

Hi clalancette,

Thanks for creating this project. It works great on Linux ISOs!

I am trying to use it to add files and directories on Windows ISOs using the examples. I tested on Windows Server 2019 evaluation ISO.

Here is the code for creating an ISO using an existing ISO (argv[1] is the original ISO name and argv[2] is the output ISO name):

import sys
import pycdlib

iso = pycdlib.PyCdlib()
iso.open(sys.argv[1])

iso.add_directory(iso_path='/DIR1')

iso.write(sys.argv[2])

iso.close()

Here is the code read.py to read the created ISO:

import sys
import pycdlib

iso = pycdlib.PyCdlib()
iso.open(sys.argv[1])

for child in iso.list_children(iso_path='/'):
    print(child.file_identifier())

iso.close()

When I run the read code on the newly generated ISO I get the error:

Traceback (most recent call last):
  File "read.py", line 5, in <module>
    iso.open(sys.argv[1])
  File "/home/h4xhor/venv/lib/python3.8/site-packages/pycdlib/pycdlib.py", line 4143, in open
    self._open_fp(fp)
  File "/home/h4xhor/venv/lib/python3.8/site-packages/pycdlib/pycdlib.py", line 2337, in _open_fp
    ic_level, lastbyte = self._walk_directories(self.pvd, extent_to_ptr,
  File "/home/h4xhor/venv/lib/python3.8/site-packages/pycdlib/pycdlib.py", line 1043, in _walk_directories
    raise pycdlibexception.PyCdlibInvalidISO('Invalid padding on ISO')
pycdlib.pycdlibexception.PyCdlibInvalidISO: Invalid padding on ISO

I also noticed that the DIR1 is not there when I mount the new ISO.

May you please tell me what I'm doing wrong?

[clalancette]

Hm, that's weird. That should just work. I'll give it a try if I can get my hands on a Windows ISO.

[h4xhor]

We can get evaluation versions of Windows. I think the current place to get them is from Windows Server 2019.