awesome: Lua output doesn't flush automatically

[gitterrost4]

Hello,
I recently switched to Awesome WM and got one problem.

I would like to be able to view output of awesomewm (both stdout and stderr) right from within Awesome. I followed the suggestion on the awesome-wiki (FAQ) and start awesome with the following line in my .xinitrc (I am starting awesome with startx):

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exec ck-launch-session dbus-launch /usr/bin/awesome  >> ~/.cache/awesome/stdout 2>> ~/.cache/awesome/stderr

The errorlog works perfectly. When I input wrong Lua-Code, it writes instantly to the stderr file.

However the stdout-file is not written instantly but only when awesome quits.

When I don't write the logs to files and start awesome with

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exec ck-launch-session dbus-launch /usr/bin/awesome

the stdout-output gets printed directly to tty1.

But why doesn't it get printed to the file instantly?

[modsRule]

This doesn't answer your question, but when I make changes to the Lua configuration files, I then boot up awesome inside Xephyr to test it from inside my old awesome session, rather than rebooting my current session to test changes.

As for your issue. I would take a look into using tee instead as demonstrated here.

[gitterrost4]

I just tried. Piping output through tee doesn't work either. It neither prints to stdout nor to the file.

I think I should mention, when I redirect the output and stderr to one file, it will write the errors but not the output until it is finished.

EDIT: I don't know if this is relevant, but when the file doesn't exist when I start awesome, it is instantly created. Still empty until awesome quits though.

[gitterrost4]

I have researched a bit more an think that the problem is related to how exec handles redirection. Does anybody have any hints on this?

[gitterrost4]

Bump. (Is this maybe a bug in awesome? Should I report it?)

[gitterrost4]

I just found out that it's just the Lua-commands that don't get flushed.

When I call the (system-)command "echo 'test'", then it gets printed to the file I am redirecting to.

Also, when I execute the lua-command io.flush() the lua output up to this point gets flushed. Is there any way to force automatic flushing of command output in Lua?