Bug#1026976: Upcoming test suite regression due to changes in file/libmagic

[Christos Zoulas]

Committed, thanks!

christos

> On Dec 30, 2022, at 7:17 PM, FC Stegerman <flx at obfusk.net> wrote:
> 
> * Christoph Biedl <debian.axhn at manchmal.in-ulm.de> [2022-12-29 16:39]:
>> Chris Lamb wrote...
>>> However, this "extra data prepended" doesn't fit well under the rubric
>>> of "data". Yes, this "#!/usr/bin/python3\n" shebang is definitely
>>> "data" of a kind, but a shebang isn't really data in that way given
>>> the special-treatment afforded to it by UNIX systems. Even if this
>>> noun was replaced by the more general "bytes", the magic nature of the
>>> shebang would still remain… as would the desire to discriminate
>>> between pyzip files and other ZIP files with prepended data.
>>> 
>>> Could another — different — string be emitted in the case that these
>>> prepended bytes are a shebang? We could potentially look for the file
>>> starting with #! and for that to take precedence over this new case.
>> 
>> After some more thinking: I suggest you do nothing for the time being
>> while I take this to upstream. If all else fails, I'll revert the change
>> for the next upload. By the way, that will be 1:5.44-1, but the changes
>> to 1:5.43-3 are minimal.
> 
> FWIW I've attached a patch that makes it discriminate between ZIP
> files with prepended data with or without a shebang:
> 
>  $ file -b zipfile-with-data-prepended
>  Zip archive, with extra data prepended
>  $ file -b pyzip
>  a /usr/bin/python3 script executable (Zip archive)
> 
> I'm not sure that completely solves the issue, because there could be
> other (executable) file formats affected, not just pyzip and other
> formats using a shebang.  So perhaps reverting the change completely
> is better after all.  We probably need upstream to figure that out.
> 
> - FC
> <pyzip.patch>_______________________________________________
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