Speeding up install and other questions
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I've been working on making debootstrap and installing go faster, as
they currently take about 5x longer than they should ( on ext4, it's
even worse on btrfs ). I have patched debootstrap to add the
eatmydata package to the required list and enable it for phase 2, and
this makes the bootstrap 5x faster. I read that the actual installer
uses cdebootstrap instead, so I have been looking at making the same
changes to it and have some questions.
debootstrap manually extracts the required packages, and fakes a
status file showing them to be unpacked before executing the extracted
dpkg in a chroot to install the important packages. cdebootstrap does
not bother faking the status file, so it ends up running dpkg to
reinstall all of the manually extracted packages. This seems wasteful.
In the debootstrap case, it is meant to be able to be run from a
foreign system, so the manual extraction makes sense, but for the
normal installer, it already has a functioning dpkg on the installer
system, and it can be passed --root= to point it to the target rather
than being run from the target in a chroot, so why not skip the
extract phase and do this instead?
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