In case of too much output OutputExecutor hangs

[pwilczynskiclearcode]

I happens when subprocess produces large amounts of output.

https://thraxil.org/users/anders/posts/2008/03/13/Subprocess-Hanging-PIPE-is-your-enemy/

Mirakuru could use real files instead of PIPE or make it an option.

[mmaslowskicc]

Seems related to #74.

I think keeping stdout as parent process's stdout would be best (e.g. for logging output from processes in CI tests), but it would be an incompatible API change breaking SimpleExecutor.output.

[pwilczynskiclearcode]

So maybe we should make it an option:

• hide subprocess output by redirecting it into a file (instead of currently used PIPEs) (default)

  .output() would be a file descriptor

• use parent stdout and strerr for subprocess stdout and err

  I'm not sure what should .output() return it that case.

[mmaslowskicc]

Raise an exception from .output() if not redirecting to a pipe?

[mmaslowskicc]

Can we make the whole output redirection non-default? It's useful only when explicitly accessing the captured output, while I need usual logging of the stdout (to my process's stdout, or captured by pytest) if any process invocation fails (e.g. when running a Java process that logs useful info on stdout).

It could be easily split into a mixin.

Currently I need to comment out stdout redirection when getting any error from test fixtures using Mirakuru.