[Bug 268547] /bin/sh 'cd' should get user's home directory from password database if HOME is unset

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268547

--- Comment #3 from jschauma@netmeister.org ---
> The code looks reasonable, but I don't really understand the point. What use 
> case is helped by this? 

I had a scenario where a process had cleared its ENV
before changing eUID, and then did a 'cd'.

Yes, "well, don't do that", but it still took me by
surprise.

> Also note that this might use an unexpected directory 
> if there are multiple /etc/passwd lines for the same UID. 

True. Not much that can be done about that, I
suppose. 

> Apart from that, if you want this fallback here, you'll also want it for tilde 
> expansion without a user name (the tilde is currently left unchanged if HOME is 
> not set or empty).

If there's interest in merging this change, then I can
take a look and update the diff. Otherwise, if folks
think it's not useful, no big deal.

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