[ltt-dev] usttrace does not support arguments with spaces

[Mathieu Desnoyers]

Hi Stefan,

* Stefan Hajnoczi (stefanha at gmail.com) wrote:
> Is usttrace still going to be around for LTTng 2.0?  If not, maybe
> these observations don't matter, but I wanted to discuss before I
> forget them.

It's not going to be around in LTTng-UST 2.0. It might be worth fixing
the UST 0.x tree though.

> 
> usttrace in ust-bin Debian 0.15-3 does not handle spaces in
> command-line arguments:
> 
>   # Prepare vars
>   CMD=$*
>   [...]
>   # Execute the command
>       $CMD 2>&1
>   ) | tee "$OUTDIR/app.log"
> 
> My temporary fix was:
> 
>   # Execute the command
>   "@" 2>&1
> 
> Since I was tracing a curses application it turned out redirecting
> stdout/stderr wasn't helpful ;).  So I dropped the app.log and
> redirection.  Capturing application output is not useful in this case.

I guess keeping the redirection would be helpful in the general case
though.

> 
> If you can point me to the git repo that has usttrace I'm happy to
> send patches.  I have to admit I failed to find usttrace in the git
> repos, I must be looking in the wrong place ;).

It's at:

http://git.lttng.org/?p=ust.git;a=summary
(git://git.lttng.org/ust.git)
  (master branch)

You'll find "usttrace" in the root of the tree.

Even though UST 0.x is in maintainance-only mode, this is the kind of
fix that I would pull for an eventual 0.15.1 bugfix-only release.

Thanks!

Mathieu

> 
> Thanks,
> Stefan
> 
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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com