[fuse-devel] Using fuse for simple commands

[MH <mat...@gm...>]

Hey everybody,

I was thinking about having a file system that just links files to 
another location (like mount --bind), but add's a simple unix command in 
between (like encFS does with encryption or fusecompress with compression).
The command I am looking for is openssl, so that I have a normal folder 
with some unencrypted files in it. So let's assume this folder is:
/disk_1/unencrypted/
Now I want to mount-bind with openssl to:
/disk_1/encrypted/
So that the files in /disk_1/encrypted/ are encrypted, but the 
encryption happens on-the-fly while reading.

Background story. I want to be able to back up my files to a remote 
location, but encrypted. I don't want to have my files encrypted all the 
time, just in the backup.
So I would create a ssh-login for a remote maschine that can only access 
the folder /disk_1/encrypted/, but nothing else. So that the remote 
maschine only sees encrypted files.
Also I want the encryption to be asynchronous, so that this all can 
happen with a public key and I only need to access the private key in 
case something goes wrong and I need the backup. That's why I can't use 
encFS.

I thought FUSE could do the job, but I am not sure if this solution 
might already exist. Can someone point me to the solution? I thought 
this could be as easy as
super-fuse -command "openssl smime -encrypt -aes256 -in $1 -binary 
-outform DEM -out $2 certificate.pem" /disk_1/unencrypted/ 
/disk_1/encrypted/
But I think this super-fuse command does not exist yet, or does it?

Thanks for your help,
hutauf