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Rosbag record in unexisting folder [closed]

asked 2013-04-23 04:30:24 -0500

updated 2013-04-23 06:13:10 -0500

Hi everybody,

I would like to know if anyone knows a solution when we record in a folder with rosbag, but that folder doesn't exist....

In my case, I found that rosbag just doesn't seems to save anything... But without any error message ! And that's a big problem, because my recording was just a "one shot" thing....

Is there any way to find the data somewhere ? (I tried ~/.ros, but nothing there)...

Thank you very much !

Stéphane

EDIT : if you launch rosbag record from a launch file, you have to let

output="screen"

otherwise the error message doesn't appears.

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Closed for the following reason the question is answered, right answer was accepted by Stephane.M
close date 2013-04-23 06:13:40

Comments

How did you manage to record to a directory that doesn't exist? Did you delete the working directory where you ran rosbag while rosbag was running?

Martin Günther gravatar image Martin Günther  ( 2013-04-23 04:35:53 -0500 )edit

In fact, imagine I want to record in /home/data folder. So I recorded some things, saved them on an hard drive, but by doing that, I removed the folder data. When I relaunch rosbag record, nothing is saved, as the folder doesn't exist anymore.

Stephane.M gravatar image Stephane.M  ( 2013-04-23 04:43:37 -0500 )edit

And rosbag then behave "as if it was recording", without letting us know it's not recording at all.

Stephane.M gravatar image Stephane.M  ( 2013-04-23 04:44:22 -0500 )edit

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answered 2013-04-23 05:33:06 -0500

To sum up my understanding of what happened: You started rosbag record in /home/data, and while rosbag was recording, you deleted that directory. The question is whether rosbag should print an error message if you do that. (Please correct me if I misunderstood your question.)

That's not a bug in rosbag, but a general design decision in Unix. As long as rosbag is still running, you can try to recover the file from /proc/pid/fd, otherwise maybe this will help (more information here).

BTW: If you delete /home/data before starting rosbag, you'll get an error saying that the file is not writable; only if you delete it while rosbag is recording, you'll lose the data.

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No. I deleted the /home/data before starting rosbag. And I didn't get any error. Maybe it is because it is inside a launch file ? Example : "<node pkg="rosbag" type="record" name="record_kinect1_rgb" args="kinect1/rgb/image_raw kinect1/rgb/camera_info -o $(arg path)/kinect1_rgb"/> "

Stephane.M gravatar image Stephane.M  ( 2013-04-23 06:03:37 -0500 )edit

But anyway, thank you for your answer, it helped me to understand :-)

Stephane.M gravatar image Stephane.M  ( 2013-04-23 06:04:15 -0500 )edit

I made an test by adding output="screen" and indeed, it shows an error message... (I desactivated it because my launch files launch so many things that I only keep the interesting messages shown...). Thank you again, have a good day !

Stephane.M gravatar image Stephane.M  ( 2013-04-23 06:10:34 -0500 )edit

Glad I could help! :-)

Martin Günther gravatar image Martin Günther  ( 2013-04-23 06:48:12 -0500 )edit

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Asked: 2013-04-23 04:30:24 -0500

Seen: 438 times

Last updated: Apr 23 '13