Consider adding an option to run under full-system emulation

[nagisa]

Something along the lines of

qemu-system-X -kernel kernel -initrd initrd -append init=executable

Should be sufficient, although it will be necessary to wrap executable into some sort of script that would

1. cleanly terminate the system after it is done running the executable;
2. transfer the exit code from the guest to the host somehow...

Obviously there are a number of complications as well (e.g. dynamic library dependencies), but for targets that do not work either way currently (s390x, sparc64, (to an extent) powerpc...) it may prove to be a viable alternative that gives significant stability boost.

As an extended future goal this could also support testing and building on various other kernels that aren’t linux!

[Alexhuszagh]

I believe this was implemented in #153 with the wrapper script of /linux-runner. Since you can also provide your own CARGO_TARGET_${TARGET}_RUNNER envvar to your custom runner if you use custom Dockerfiles, you can fine-tune this if needed.