software-properties SRU stopped due to odd bug

[Bryce Harrington]

On Mon, Dec 13, 2021 at 03:50:10PM +1300, Robert Ancell wrote:
> Hi all,
> 
> I have a software-properties SRU [1] in bionic that has phasing stopped due
> to an error [2].
> 
> The stack trace is showing the following (new) code is failing:
> 
>     di = distro_info.UbuntuDistroInfo()
>     releases = di.get_all(result="object")
> 
> with the error:
> 
>     AttributeError: 'UbuntuDistroInfo' object has no attribute 'get_all'
> 
> This is very confusing, since the code from this (from the distro-info
> library) is essentially:
> 
>     class DistroInfo:
>         def get_all(self, result="codename"):
>             ...
> 
>     class UbuntuDistroInfo(DistroInfo):
>         def __init__(self):
>             super().__init__("Ubuntu")
> 
> i.e. I can't see any reason why the `di` object would not have a get_all()
> method. Running software-properties and various test scripts on a bionic VM
> I haven't been able to reproduce any such issues.
> 
> Theories that have been proposed:
> - The user is actually running an older version of disto-info that was from
> before this method was added (in distro-info 0.15).
>   - Seems unlikely since there are error cases in which the install was
> done with a bionic image.
> - The user has a locally installed version of distro-info.
>   - Stacktraces shows the system installed version, the appropriate version
> of the binary installed, no PYTHONPATH set.
> - A .pyc is being used that doesn't match the source.
>   - Since installs have been from bionic media, it seems impossible that an
> older .pyc could be created.
> - Other code has removed this method.
>   - Method is being accessed immediately, no other code seen in source that
> could do this.
> - Memory corruption.
>  - Too many cases for error to be random, not seeing other similar issues.
> 
> Does anyone have any ideas about what might be going on?

Could it be an old pip-installed version of distro-info?
(C.f. LP: #1848829, #1874250)

Bryce

> --Robert
> 
> [1] https://launchpad.net/ubuntu/+source/software-properties/0.96.24.32.18
> [2]
> https://errors.ubuntu.com/problem/477791e8cc662f8dca46050bb638e273028a522f

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