v0.5: Using regex filter causes Scaphandre to panic

[olepbr]

Bug description

Attempting to use the stdout exporter's regex filter (-r) causes Scaphandre to panic and exit. Backtrace:

⚘ ~/dev/rust/scaphandre RUST_BACKTRACE=1 ./target/debug/scaphandre stdout -r chromium                                                                                                                          [101]
Scaphandre stdout exporter
Sending ⚡ metrics
Measurement step is: 2s
Host:	0 W
	package 	core		dram		uncore
Processes filtered by 'chromium':
Power		PID	Exe
No processes found yet or filter returns no value.
------------------------------------------------------------

Host:	2.072913 W
	package 	core		dram		uncore
Socket0	2.072913 W |	0.61677 W	0.438338 W	0.007717 W	

Processes filtered by 'chromium':
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: PermissionDenied(None)', src/sensors/utils.rs:302:48
stack backtrace:
   0: rust_begin_unwind
             at /rustc/5e1d3299a290026b85787bc9c7e72bcc53ac283f/library/std/src/panicking.rs:577:5
   1: core::panicking::panic_fmt
             at /rustc/5e1d3299a290026b85787bc9c7e72bcc53ac283f/library/core/src/panicking.rs:67:14
   2: core::result::unwrap_failed
             at /rustc/5e1d3299a290026b85787bc9c7e72bcc53ac283f/library/core/src/result.rs:1690:5
   3: core::result::Result<T,E>::unwrap
             at /rustc/5e1d3299a290026b85787bc9c7e72bcc53ac283f/library/core/src/result.rs:1092:23
   4: scaphandre::sensors::utils::IProcess::exe
             at ./src/sensors/utils.rs:302:28
   5: scaphandre::sensors::utils::ProcessTracker::get_filtered_processes
             at ./src/sensors/utils.rs:903:39
   6: scaphandre::exporters::stdout::StdoutExporter::show_metrics
             at ./src/exporters/stdout.rs:242:25
   7: scaphandre::exporters::stdout::StdoutExporter::iterate
             at ./src/exporters/stdout.rs:157:9
   8: scaphandre::exporters::stdout::StdoutExporter::runner
             at ./src/exporters/stdout.rs:140:17
   9: <scaphandre::exporters::stdout::StdoutExporter as scaphandre::exporters::Exporter>::run
             at ./src/exporters/stdout.rs:20:9
  10: scaphandre::run
             at ./src/lib.rs:89:9
  11: scaphandre::main
             at ./src/main.rs:89:5
  12: core::ops::function::FnOnce::call_once
             at /rustc/5e1d3299a290026b85787bc9c7e72bcc53ac283f/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

To Reproduce

1. scaphandre stdout -r foo
2. Watch it panic.

Expected behavior

Scaphandre should output the list of processes matching the regex, if any.

Environment

• Linux distribution version: Manjaro 22.1.0 (Talos)
• Kernel version: 6.2.8-1-MANJARO

Additional context

This is fixed on dev due to the problematic implementation of IProcess.exe(&self) being removed in b18aaee. Obviously Scaphandre isn't "stable" software yet, but it would maybe be nice to release a new version which addresses this? (Provided that cutting a new release from dev isn't too much work.)

Cheers!

[TheElectronWill]

Maybe a new label fixed-on-dev could be added for issues like this?

[bpetit]

Hi,

Next release is close. In the mean time, would it be acceptable to use the dev version ?