UCS 5.0 Update fails due to UCR templates are not compatible with Python 3: package: univention-management-console-server

[bublikov]

Hello,

I’m trying to upgrade UCS, which fails. Please see the details below:

Current UCS version is: 4.4-8 errata1019

Desired UCS version is: 5.0-0

Following error is located in the update log (/var/log/univention/updater.log):

python_ucr_template_compatibility:
The following UCR templates are not compatible with Python 3:
/etc/univention/templates/files/etc/pam.d/univention-management-console.d/30_tally (package: univention-management-console-server)
See https://help.univention.com/t/17948 for information on how to proceed with each template.

I followed the link, and located this thread:

UCS 5.0 upgrade failed: solve pre-update check python-ucr-template-compatibility

During the upgrade to UCS 5.0 all UCR templates are checked to contain Python 3 compatible syntax. If templates are detected which are not compatible, the upgrade is blocked. Each template has to be checked individually for possible solutions. In general either the template may be removed as it is part of an old/uninstalled but not-purged package or the template belongs to an App, which is not yet released for UCS 5.0 and which needs an upgrade. python_ucr_template_compatibility: The follow…

Unfortunately, 30_tally module is not in the list of the templates that can be safely removed (as indicated in the post from the link above), and is a short Python script (10~15 lines). Any suggestions on how to solve this are much appreciated. Thank you.

Best regards,
bublik

[lcx]

Get the pre update check script from here: https://updates.software-univention.de/download/univention-update-checks/pre-update-checks-5.0-0
on line 983 you can find the check for python compatibility but unfortunately it sends the output to /dev/null so you have no clue what is wrong.
change that to stdout=open(’/tmp/pycheck’, ‘a’)

so it will look like this:

                        ret = subprocess.call(
                                ('/usr/bin/python3', '-m', 'py_compile', ucr_temp_file),
                                stdout=open('/tmp/pycheck', 'a'), stderr=subprocess.STDOUT,
                                close_fds=True)
                        template = template[end.end():]

run the script again and look at the /tmp/pycheck file what it’s complaining about, fix it, run the script again until it’s happy.

In my case it was print which in python 3 requires parentheses

all I had to do is change all prints from something like this:

print 'control:LM-Password\t\t:=\tsambaLMPassword'

to

print('control:LM-Password\t\t:=\tsambaLMPassword')

but since I’m not a python dev, I have no clue if this will still work.

 print('\tport = "%s"' % (configRegistry.get('ldap/server/port', '7389'), ))