bug#55270: unpack phase randomly changes the cwd

[Attila Lendvai <attila@lendvai.name>]

> It takes the first result 'scandir' -- i.e., the 'smallest' file name
> according to string-locale<?, so technically it's not random (so no
> reproducibility problems)


fair enough. what i meant to communicate is that it's arbitrary, not random.

another potential issue:

if the root of the archive contains a file called 'environment-variables', then this way it would overwrite the one generated by Guix. this may not necessarily be an issue, though, if that file is never used after the unpack phase.

maybe the cleanest would be to:

1) mkdir a directory ('extracted/'?) and chdir into it prior to
   unpacking, and

2) only do the DWIM chdir if the toplevel of the archive was a single
   dir.

but i lack the necessary perspective to see all the implications.

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