[CI/tigron]: investigate file descriptor leak detection as a testing feature

[apostasie]

What is the problem you're trying to solve

Probably leverage lsof -nP -p X (or implement it in go)

Describe the solution you'd like

Automatically fail a test if the test is leaking file descriptors.

Ideally, fail a test if the tested binary is leaking.

Additional context

Note: evaluate #4013 as well.

[apostasie]

@fahedouch can you tentatively mark this for milestone 2.x.x?

[apostasie]

Possibly investigate using: https://github.com/u-root/u-root/blob/main/pkg/strace

@AkihiroSuda any idea how to best approach the problem of finding file leaks overall in tested binaries?
I am currently thinking ptrace-ing cmd.Exec (some golang equivalent of strace -e trace=open,openat,close -f -p XXX)?

Wondering if gomodjail could be made a bit more generic to allow for usecases like this?
Or if we could have a standalone library for that used by gomodjail?
eg: having something like stracelib.Trace(*exec.Cmd, callback func(ProcessSomething, SyscallSomething)...)

This is not trivial stuff.

[apostasie]

@AkihiroSuda not happening before 05/06 => v2.2