`lscpu`: panic on aarch64-linux

[RossComputerGuy]

I'm running uutils-util-linux inside of an initrd in an Arm QEMU VM on an Ampere Altra host. util-linux is built from commit 93a60ee, lscpu fails with a panic:

$ lscpu

thread 'main' (161) panicked at src/uu/lscpu/src/sysfs.rs:154:71:
called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

/sys is mounted, I'm not sure what the problem is. lscpu works on my host and other Arm systems. This is how I have QEMU configured:

qemu-system-aarch64 -drive if=pflash,format=raw,unit=0,readonly=on,file=$(nix build nixpkgs#OVMF.fd --no-link --print-out-paths)/FV/AAVMF_CODE.fd -machine virt,gic-version=max,accel=kvm:tcg -cpu max -drive file=fat:rw:fs,format=raw,media=disk -display none -serial stdio -m 128G -smp 16 -device virtio-gpu

[jmr]

thread 'main' (161) panicked at src/uu/lscpu/src/sysfs.rs:154:71:

util-linux/src/uu/lscpu/src/sysfs.rs

Line 154 in 0d9acbc

let size_string = fs::read_to_string(cache_path.join("size")).unwrap();

You have no /sys/devices/system/cpu/cpu0/cache/index*/size file. Can you do

tar -czvf lscpu.tar.gz \
    --ignore-failed-read \
    /sys/devices/system/cpu \
    /proc/cpuinfo

?

The unwrap is also a problem. I'll make it more forgiving. What does the util-linux lscpu output?

[jmr]

I have a fix in jmr@229f441, but haven't made a PR yet since #528 and #529 should be merged first.