Re: [PATCH 03/14] relocatable: support UNIXROOT in relocate() on EMX

[KO Myung-Hun]

Ben Pfaff wrote:
> On Tue, Dec 09, 2014 at 10:40:48AM +0900, KO Myung-Hun wrote:
>> UNIXROOT is used to specify a drive of a root of FHS. So if a path is
>> started with '/', then it should be translated to "$UNIXROOT/".
>>
>> * lib/relocatable.c (relocate): Prepend $UNIXROOT to pathname if it is
>> started with '/' on EMX.
> 
> As one of the maintainers of the relocatable modules, the code in this
> patch seems reasonable to me.  I don't know enough about OS/2 or EMX to
> know whether $UNIXROOT is a customary variable or whether this is a
> correct context for using it.  Can you assure me that you've thought
> about those?

OS/2 file system is based on drives[A-Z]. '/' means a root of a current
drive. There are maximum 26 kinds of '/'.

For examples, consider that xxx is installed into f:/usr/bin. If
executing xxx on drive e:, '/' of xxx is e:/ not f:/. In this case, xxx
fails to find its root.

$UNIXROOT is used to overcome this problem. On OS/2, $UNIXROOT is used
to specify a drive of '/'. And all programs following FHS are installed
on a drive specified by $UNIXROOT. In the above, if UNIXROOT is set to
'f:'. Then '/' is translated to 'f:/' as xxx expects.

And see <http://trac.netlabs.org/libc/wiki/UnixPenthouseApartement>.

Still not assured ?

-- 
KO Myung-Hun

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