[Buildroot] [PATCH 4/5] support/download: only create final temp file when needed

[Arnout Vandecappelle <arnout@mind.be>]

On 07/07/14 23:53, Yann E. MORIN wrote:
> Arnout, All,
> 
> On 2014-07-07 18:08 +0200, Arnout Vandecappelle spake thusly:
>> On 06/07/14 23:27, Yann E. MORIN wrote:
[snip]
>>> +# Upon failure, git cleans behind itself, so no need to catch failures here.
>>> +# The only case when git would not clean up, is if it gets killed with SIGKILL.
>>
>>  I think the SIGKILL is reason enough to do the rm explicitly in the script. Of
>> course, this is only valid if you use the trap, otherwise you never reach the rm
> 
> Well, SIGKILL is not catchable. That's the main selling point of SIGKILL.
> ;-)

 If git gets SIGKILLed, the shell script is still running.

> 
>> (due to 'set -e').
> 
> Well, 'set -e' only kicks in for the final 'mv', since all other
> commands and conditions in an if statement.

 The call to git clone isn't, though.

> 
> Also, I'm not a big fan of traps, although I can be abusing them from
> time to time.

 I do agree that trap is mightily confusing: it has obscure syntax, and you can
easily accidentally replace an earlier trap. So in fact, it would be better not
to use 'set -e' but to put everything in conditions. But that just moves the
problem elsewhere...


 Regards,
 Arnout

> 
> But OK, I'll add this to the TODO...
> 
> Regards,
> Yann E. MORIN.
> 


-- 
Arnout Vandecappelle                          arnout at mind be
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