Procfs v0.8.1 does not support kernel version string larger than 256

[charles-typ]

Bug description

Linux kernel version: 4.19.270. When I tried to run scaphandre (version 0.4.1) with qemu exporter, I got the following error:

Sending ⚡ metrics 
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Other("Failed to parse patch version")', /home/XXX/.cargo/registry/src/github.com-1ecc6299db9ec823/procfs-0.8.1/src/lib.rs:315:34                                
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

To Reproduce

Directly compile the code.

Expected behavior

Qemu exporter should be started.

Environment

• Linux distribution version [Ubuntu 18.04.6 LTS]
• Kernel version (output of uname -r) [4.19.270]

Additional context

After a deep dive, the procfs version v0.8.1 still uses u8 as the kernel version patch string, and any number larger than 256 with cause a panic. A simple workaround for me was to compile my own procfs-v0.8.1 but change the patch to u16, following this patch. A better solution would be upgrading procfs version to v0.10.0 or newer because the patch was applied to that version and above. It's not a simple fix, as procfs changed the interface from floating point numbers to integers for CPU information. Details can be found here and here.

[bpetit]

Hi !

Thanks for reporting this. We just moved most of what procfs did to sysinfo (except the container information gathering part).

Could you give a try to the current dev branch to see if this problem gets any better ?

[bpetit]

Closing until someone speaks up :)