Unison sshfs on Ubuntu

 I use unison to synchronize and backup my files between four computers. Recently I noticed a problem that I couldn't modify an already existing file from a different computer. I was getting the error message: 

Error in renaming /path/to/local_file.filename 

Operation not permitted [rename(/path/to/remote_file.filename)]

I found about the problem and a solution to that on a forum. Apparently sshfs has a problem with renaming files. Adding a workaround=rename option to my fstab solved the problem. Below is my fstab line:

 sshfs#
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 :/RAID1    /RAID1  fuse    noauto,user,idmap=user,workaround=rename  0        3

This seems to work fine for now. 

See also

• Unison Homepage
• Ubuntu forums on the problem
• FUSE/SSHFS Wiki