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Concerning free software, programming, and whatever else I find interesting. Also the blog for my Web site, frigidcode.com.
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chironfs and sshfs: "mknod failed accessing..." error

Posted 06-15-2012 at 10:26 PM by hydraMax
Updated 06-16-2012 at 01:04 PM by hydraMax (update)

I thought I'd post this for posterities sake:

chironfs is a nifty fuse-based file system that duplicates a file hierarchy across multiple paths. (Like a file system version of RAID 1.) However, I found that if I tried to use an sshfs mounted directory as one of the paths, chironfs disables the path with the error "mknod failed accessing <path> Permission denied".

The workaround I found was to pass in the following option to sshfs when mounting the sshfs mount point: -o idmap=user. If this is done, chironfs seems to work fine with it.

I dug into the chironfs-1.1.1, and it appears that, before chironfs creates a new file, it first checks the ownership of the parent directory to see if it matches that of its own user, and fails if it doesn't. This of course doesn't work by default with sshfs, because sshfs allows you to create files on the remote machine even though you don't have the same local user name.

No idea why chironfs has the extra check. I thought it was a generally understood rule that programs shouldn't do an extra permissions check before attempting an operation. Just attempt the operation and report an error if it fails.

Update:

After trying to create some more files in the virtual mount, I ran across another error, where chironfs tries to chown the files (???), fails, and again disables syncing to the the sshfs directory.
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