Why yes is not enough ?

[Ronan KERYELL]

I've just succeeded in my first FAI install without any question with the
CVS version. It still lacks some polishing but it is good. :-)

I've modified the line 148 of install_packages :
  $error = system "$command";
into
  $error = system "yes '' | $command";
in order to avoid questions from base-passwd, sysvinit, pcmcia-cs and ppp
but I wonder why it is needed since install_packages is already called
from subroutines with :
yes '' | install_packages

Strange...
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