sh:exec: Output stdout and stderr to individual files

[staffan.spam@…]

It'd be nice there was a way to control the output of individual streams for the sh:exec recipe command. I.e.:

• output stderr and stdout to different files.
• output only one of them to file.

(If there already is a way to do this, it's not documented.)

[Olaf Meeuwissen <olaf@…>]

On both branches/0.6.x​ and trunk​, the sh:exec and sh:pipe commands put stdout and stderr messages in the file specified via the command's output attribute. Note that stdout is logged at info and stderr at error priority.

Patching the output to file behaviour is pretty straightforward. The only problem is what should be done with stderr in the case the output attribute is specified. Currently, it ends up in the output file, which may or may not be desirable. My main concern here is with backwards compatiblity and I'm not sure what is preferred: keeping things the way they are or leaving stderr out of the output file.

I'll have a shot at making a patch (for the latter approach, which is what I prefer).

[Olaf Meeuwissen <olaf@…>]

Split destination of stdout and stderr to separate files