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Is it possible to detect the processor, such as by uname -p, from within a preseed post-install script? uname -p returns unknown, and in-target uname -p returns nothing.
I ask because I need to fetch and install an architecture-specific .deb file from within the script.
It turns out that uname is implemented by BusyBox during preseed, and it supports uname -m but not uname -p. You can verify in a normal shell with BusyBox installed:
$ uname -p
x86_64
$ busybox uname -p
unknown
$ busybox uname -m
x86_64
In all the cases I care about, the values happen to be the same.
sudo cat /proc/cpu/proc/cpuinfo), but even accessing /proc from preseed sounds complicated. Then you have to parse out the architecture yourself by grepping for various keywords that identify x86-32, x86-64, ARM, etc.