Comment 55 for bug 443080

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Scott James Remnant (Canonical) (canonical-scott) wrote :

Dustin: in the mount manpage:

       -f Causes everything to be done except for the actual system call;
              if it's not obvious, this ``fakes'' mounting the file system.
              This option is useful in conjunction with the -v flag to deter‐
              mine what the mount command is trying to do. It can also be used
              to add entries for devices that were mounted earlier with the -n
              option. The -f option checks for existing record in /etc/mtab
              and fails when the record already exists (with regular non-fake
              mount, this check is done by kernel).

It's one of the standard options that util-linux-ng will always pass to its helper. Others include -s, -n, -v and -o

If this is hard to add to ecryptfs, I can ensure mount never calls mount.ecryptfs