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Re: intended MBF: wrong redirections in maintainer scripts




On Tue, Aug 07, 2018 at 12:38:32PM +0200, Wouter Verhelst wrote:
> On Sat, Aug 04, 2018 at 01:15:57PM +0800, Ralf Treinen wrote:
> > as announced in our talk at debconf'18 [1] we intend a MBF about wrong
> > redirections in maintainer scripts. In general these are of the form
> > 
> >   foo 2>&1 1> /dev/null
> > 
> > Here it was probably intended to send both stderr and stdout to /dev/null.
> 
> What makes you say that? ;-)
> 
> It may be that the maintainer did indeed want stdout to be discarded,
> but stderr not; for instance because they wanted to parse the stderr
> output.
> 
> (not saying this is the most likely case, but you might want to
> double-check that before filing the bugs)

Oy vey... I didn't notice this when Ralf's mail was posted (merely
checked whether I'm or QA are on the dd-list).  But, indeed, this whole
MBF is wrong.  Thanks Wouter!

The rarer case of silencing both stdout and stderr tends to be written:
    foo >/dev/null 2>/dev/null
-- or at least I've been taught so, as this doesn't look like the common
case.  Ie:
    foo 2>&1 /dev/null
which you somehow have a problem with.  Don't you use this very construct
every a few days?


Meow!
-- 
⢀⣴⠾⠻⢶⣦⠀ So a Hungarian gypsy mountainman, lumberjack by day job,
⣾⠁⢰⠒⠀⣿⡁ brigand by, uhm, hobby, invented a dish: goulash on potato
⢿⡄⠘⠷⠚⠋⠀ pancakes.  Then the Polish couldn't decide which of his
⠈⠳⣄⠀⠀⠀⠀ adjectives to use for the dish's name.