The fsck command gives warnings in some cases. I have one case, where it is easy to reproduce:

host:/dev/shm% mkdir obnam 0
host:/dev/shm% obnam -r /dev/shm/obnam backup /dev/shm/0
Backed up 1 files, uploaded 0.0 B in 0s at 0.0 B/s average speed
host:/dev/shm% obnam -r /dev/shm/obnam fsck
warning: node 1: node must have keys
warning: node 1: node must have keys
Checking 15/14: extra chunks

Version used: debian/stable/backports 1.0-1~bpo60+1

I guess this is a minor issue, but still would be nice, if fsck would be mostly calm.

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I confirm that I can see the same error. --liw

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done --liw