bug#23112: value of _CS_PATH\

bug#23112: value of _CS_PATH\

[John Darrington]

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Would it not be correct for guix to have 

 confstr (_CS_PATH, buf, len);

set the contents of buf with the bin directory of the currently 
installed coreutils package?

For me, it returns /bin:/usr/bin which is not correct.

J'
  

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bug#23112: value of _CS_PATH\

[Ludovic Courtès]

John Darrington <john@darrington.wattle.id.au> skribis:

> Would it not be correct for guix to have 
>
>  confstr (_CS_PATH, buf, len);
>
> set the contents of buf with the bin directory of the currently 
> installed coreutils package?
>
> For me, it returns /bin:/usr/bin which is not correct.

Fixing it is a bit tricky because:

  1. The meaning of this variable is ill-defined.  Specifically, POSIX
     says it “is the value for the PATH environment variable that finds
     all standard utilities.”  By “standard utilities”, surely they must
     be talking of ‘guile’, ‘guix’, ‘herd’, and a couple of others, but
     we can’t be sure.  ;-)

     http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html

  2. If CS_PATH refers to Coreutils, then that means that libc refers to
     Coreutils, which is inconvenient at best.

  3. We could set CS_PATH to /run/current-system/profile/bin but that
     wouldn’t work on foreign distros.

So I’m inclined to leave things as is.

Did you find a situation where the invalid value was causing troubles?

Thanks,
Ludo’.

bug#23112: value of _CS_PATH\

[Ludovic Courtès]

ludo@gnu.org (Ludovic Courtès) skribis:

> John Darrington <john@darrington.wattle.id.au> skribis:
>
>> Would it not be correct for guix to have 
>>
>>  confstr (_CS_PATH, buf, len);
>>
>> set the contents of buf with the bin directory of the currently 
>> installed coreutils package?
>>
>> For me, it returns /bin:/usr/bin which is not correct.
>
> Fixing it is a bit tricky because:
>
>   1. The meaning of this variable is ill-defined.  Specifically, POSIX
>      says it “is the value for the PATH environment variable that finds
>      all standard utilities.”  By “standard utilities”, surely they must
>      be talking of ‘guile’, ‘guix’, ‘herd’, and a couple of others, but
>      we can’t be sure.  ;-)
>
>      http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
>
>   2. If CS_PATH refers to Coreutils, then that means that libc refers to
>      Coreutils, which is inconvenient at best.
>
>   3. We could set CS_PATH to /run/current-system/profile/bin but that
>      wouldn’t work on foreign distros.
>
> So I’m inclined to leave things as is.

I’ll close the bug if you don’t mind, but…

> Did you find a situation where the invalid value was causing troubles?

… I’m still interested in knowing this.  :-)

TIA,
Ludo’.

bug#23112: value of _CS_PATH\

[John Darrington]

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On Tue, May 03, 2016 at 10:22:43PM +0200, Ludovic Court??s wrote:
     ludo@gnu.org (Ludovic Court??s) skribis:
     
     > John Darrington <john@darrington.wattle.id.au> skribis:
     >
     >> Would it not be correct for guix to have 
     >>
     >>  confstr (_CS_PATH, buf, len);
     >>
     >> set the contents of buf with the bin directory of the currently 
     >> installed coreutils package?
     >>
     >> For me, it returns /bin:/usr/bin which is not correct.
     >
     > Fixing it is a bit tricky because:
     >
     >   1. The meaning of this variable is ill-defined.  Specifically, POSIX
     >      says it ???is the value for the PATH environment variable that finds
     >      all standard utilities.???  By ???standard utilities???, surely they must
     >      be talking of ???guile???, ???guix???, ???herd???, and a couple of others, but
     >      we can???t be sure.  ;-)
     >
     >      http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/unistd.h.html
     >
     >   2. If CS_PATH refers to Coreutils, then that means that libc refers to
     >      Coreutils, which is inconvenient at best.
     >
     >   3. We could set CS_PATH to /run/current-system/profile/bin but that
     >      wouldn???t work on foreign distros.
     >
     > So I???m inclined to leave things as is.
     
     I???ll close the bug if you don???t mind, but???

OK
     
     > Did you find a situation where the invalid value was causing troubles?
     
     ??? I???m still interested in knowing this.  :-)

I didn't find a technical trouble.  Only political ones.
     
     TIA,
     Ludo???.

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