Re: Downgrading glibc from Rawhide removed /bin/sh (!)

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* Panu Matilainen:

> On 3/7/19 5:52 PM, Florian Weimer wrote:
>> * Panu Matilainen:
>>
>>> On 3/7/19 1:13 PM, Florian Weimer wrote:
>>>> * Richard W. M. Jones:
>>>>
>>>>> $ sudo dnf install glibc-headers.i686
>>>> …
>>>>> Downgrading:
>>>>
>>>> That looks like a bug in itself.
>>>>
>>>> The last time I looked at something similar, I saw this: RPM would not
>>>> adjust a pre-existing symbolic link to a new target very late in the
>>>> transaction.  Like deleting old files which are gone in an update or
>>>> downgrade, this does *not* happen when the unpacking of the replacement
>>>> package happens, but towards the conclusion of the transaction.  In the
>>>> meantime, scriptlets run with the broken file system.
>>>>
>>>> In your case, maybe one of the scriptlet errors prevented the final step
>>>> with the adjustment of the symbolic link by RPM.
>>>>
>>>> (Just to be clear, the symbolic link is regularly packaged, it's not
>>>> something that we manage using scripts.)
>>>
>>> IIRC the issue is that at when ldconfig runs from the package scripts,
>>> on downgrade the newer file is still on disk and thus ldconfig leaves
>>> the link the way it is, but at the end of transaction it'll be gone
>>> and symlinks can be broken.
>>
>> Is there a chance that RPM will be changed to run more scriptlets with
>> the final disk contents?
>
> There's %transfiletriggerin, %transfiletriggerpostun and %posttrans
> that run after the entire transaction, and then the individual
> postun-type scripts/triggers. What is it that you're missing?

Correct symbolic links.

If the symbolic links are not installed as they are in the packaged
contents before running scriptlets (any scriptlets), we need to bring
back the ldconfig scriptlets.  This is not just a problem for glibc.

Thanks,
Florian
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