Rebuild without downloading
> I have built several .iso and it works fine. However I wonder why I can't rebuild without downloading all the packages again.
What you got downloaded is not "all the packages" but only some meta
from the mirror to make sure you've got up-to-date local packages.
> I work live-helper1.0~a6-1
upgrading to latest live-helper is probably wise.
If you really don't want the "update" part, take your responsabilities
and comment out :
rm -f .stage/chroot_sources
in the end of /usr/bin/lh_binary ;-)
Thus .stage/chroot_sources will persist in the .stage directory,
lh_chroot_sources will then be skipped, and "aptitude update" won't
be called anymore.
Wondering if the advice is good though.