failed to rename rospack cache

rospack

asked 2011-06-17 04:49:38 -0500

LJ
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updated 2011-06-17 12:21:35 -0500

I am running the AR drone drivers and teleop package from Brown University's repository and I keep getting this error when I run the driver:

[rospack] Error: failed  to rename cache file /home/ubuntu/.ros/.rospack_cache.SBalWf to /home/ubuntu/.ros/rospack_cache: No such file or directory

This error started showing up recently as it was running earlier. I am running Ubuntu 11.04 off a USB stick which has about 200MB of free space remaining. I was wondering if this was due to space running low on the disk, not sure. Looked around for help but could not find this error posted online. Any help would be appreciated.

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answered 2011-06-17 08:50:42 -0500

LJ
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Thanks guys. I don't think that I would be able to rename the files myself as the ROS package is creating them plus others when I do a rosrun. I tried the rosclean purge without any success. Just going to put the drive image on a larger drive and see if that resolves the issue. The current drive will crash inevitably. Will report back.

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FYI, better to give additional info updates by either updating your question, or posting comments under your question or under answers you are replying to. Posting comments as answers if frowned upon.

Asomerville ( 2011-06-17 12:26:25 -0500 )edit

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answered 2011-06-17 07:45:38 -0500

dornhege

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To me it looks as if the program creates a temporary file by name only, not directly, and tries to move that to a proper filename. If that creation fails, the move after that also fails, which is the error message.

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That's exactly what's happening: rospack rebuilds the cache by creating a temporary file, then doing an atomic rename to overwrite the old cache. That's to avoid corrupting the cache with aborted or concurrent writes to file. In this case, I'd guess that permissions on /home/ubuntu/.ros/rospack_cache are set incorrectly (e.g., it might be owned by root).

Brian Gerkey ( 2011-06-20 04:48:59 -0500 )edit

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answered 2011-06-17 06:46:24 -0500